diff --git a/apps/workflow/BUCK b/apps/workflow/BUCK
new file mode 100644
index 0000000..d7e5d1b
--- /dev/null
+++ b/apps/workflow/BUCK
@@ -0,0 +1,12 @@
+BUNDLES = [
+    '//apps/workflow/api:onos-apps-workflow-api',
+    '//apps/workflow/app:onos-apps-workflow-app',
+]
+
+onos_app (
+    category = 'Utility',
+    description = "Workflow application",
+    included_bundles = BUNDLES,
+    title = 'Workflow',
+    url = 'http://onosproject.org',
+)
diff --git a/apps/workflow/BUILD b/apps/workflow/BUILD
new file mode 100644
index 0000000..118458e
--- /dev/null
+++ b/apps/workflow/BUILD
@@ -0,0 +1,12 @@
+BUNDLES = [
+    "//apps/workflow/api:onos-apps-workflow-api",
+    "//apps/workflow/app:onos-apps-workflow-app",
+]
+
+onos_app(
+    category = "Utility",
+    description = "Workflow application",
+    included_bundles = BUNDLES,
+    title = "Workflow",
+    url = "http://onosproject.org",
+)
diff --git a/apps/workflow/api/BUCK b/apps/workflow/api/BUCK
new file mode 100644
index 0000000..f9461af
--- /dev/null
+++ b/apps/workflow/api/BUCK
@@ -0,0 +1,11 @@
+COMPILE_DEPS = [
+    '//lib:CORE_DEPS',
+    '//lib:jackson-core',
+    '//lib:jackson-annotations',
+    '//lib:jackson-databind',
+    '//core/store/serializers:onos-core-serializers',
+]
+
+osgi_jar_with_tests (
+    deps = COMPILE_DEPS,
+)
diff --git a/apps/workflow/api/BUILD b/apps/workflow/api/BUILD
new file mode 100644
index 0000000..721e4b9
--- /dev/null
+++ b/apps/workflow/api/BUILD
@@ -0,0 +1,7 @@
+COMPILE_DEPS = CORE_DEPS + KRYO + JACKSON + [
+    "//core/store/serializers:onos-core-serializers",
+]
+
+osgi_jar_with_tests(
+    deps = COMPILE_DEPS,
+)
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/AbstractWorkflow.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/AbstractWorkflow.java
new file mode 100644
index 0000000..8a5f2b8
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/AbstractWorkflow.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import java.net.URI;
+
+/**
+ * Abstract class for workflow.
+ */
+public abstract class AbstractWorkflow implements Workflow {
+
+    /**
+     * ID of workflow.
+     */
+    private URI id;
+
+    /**
+     * Constructor for AbstractWorkflow.
+     * @param id ID of workflow
+     */
+    protected AbstractWorkflow(URI id) {
+        this.id = id;
+    }
+
+    @Override
+    public URI id() {
+        return id;
+    }
+
+    @Override
+    public WorkflowContext buildContext(Workplace workplace, DataModelTree data) throws WorkflowException {
+        return new DefaultWorkflowContext(id, workplace.name(), data);
+    }
+
+    @Override
+    public WorkflowContext buildSystemContext(Workplace workplace, DataModelTree data) throws WorkflowException {
+        return new SystemWorkflowContext(id, workplace.name(), data);
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/AbstractWorklet.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/AbstractWorklet.java
new file mode 100644
index 0000000..b9fb133
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/AbstractWorklet.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+
+import org.onosproject.event.Event;
+
+/**
+ * Abstract class for worklet.
+ */
+public abstract class AbstractWorklet implements Worklet {
+
+    @Override
+    public String tag() {
+        return this.getClass().getName();
+    }
+
+    @Override
+    public boolean isCompleted(WorkflowContext context, Event event)throws WorkflowException {
+        throw new WorkflowException("(" + tag() + ").isCompleted should not be called");
+    }
+
+    @Override
+    public boolean isNext(WorkflowContext context) throws WorkflowException {
+        throw new WorkflowException("(" + tag() + ").isNext should not be called");
+    }
+
+    @Override
+    public void timeout(WorkflowContext context) throws WorkflowException {
+        throw new WorkflowException("Timeout happened");
+    }
+}
+
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/BranchWorklet.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/BranchWorklet.java
new file mode 100644
index 0000000..4f91bba
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/BranchWorklet.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+/**
+ * An interface representing branch worklet. Branch worklet is used for branching workflow execution.
+ */
+public interface BranchWorklet extends Worklet {
+
+    @Override
+    default void process(WorkflowContext context) throws WorkflowException {
+        throw new WorkflowException("This workletType.process should not be called");
+    }
+
+    @Override
+    default boolean isNext(WorkflowContext context) throws WorkflowException {
+        throw new WorkflowException("This workletType.isNext should not be called");
+    }
+
+    /**
+     * Returns next worklet class for branching.
+     * @param context workflow context
+     * @return next worklet class
+     * @throws WorkflowException workflow exception
+     */
+    Class<? extends Worklet> next(WorkflowContext context) throws WorkflowException;
+}
+
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/ContextEventMapStore.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/ContextEventMapStore.java
new file mode 100644
index 0000000..c26b3be
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/ContextEventMapStore.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.store.service.DocumentPath;
+import org.onosproject.store.service.Versioned;
+
+import java.util.Map;
+
+/**
+ *  WorkflowContext Event Map Store.
+ */
+public interface ContextEventMapStore {
+
+    /**
+     * Registers workflow context event mapping.
+     * @param eventType the class name of event
+     * @param eventHint event hint string value of the event
+     * @param contextName workflow context name
+     * @param workletType the class name of worklet
+     * @throws WorkflowException workflow exception
+     */
+    void registerEventMap(String eventType, String eventHint,
+                          String contextName, String workletType) throws WorkflowException;
+
+    /**
+     * Unregisters workflow context event mapping.
+     * @param eventType the class name of event
+     * @param eventHint event hint string value of the event
+     * @param contextName workflow context name
+     * @throws WorkflowException workflow exception
+     */
+    void unregisterEventMap(String eventType, String eventHint,
+                            String contextName) throws WorkflowException;
+
+    /**
+     * Returns workflow context event mapping.
+     * @param eventType the class name of event
+     * @param eventHint event hint string value of the event
+     * @return workflow context event mapping
+     * @throws WorkflowException workflow exception
+     */
+    Map<String, String> getEventMap(String eventType, String eventHint) throws WorkflowException;
+
+    /**
+     * Returns child nodes on document tree path.
+     * @param path document tree path
+     * @return children under document tree path
+     * @throws WorkflowException workflow exception
+     */
+    Map<String, Versioned<String>> getChildren(String path) throws WorkflowException;
+
+    /**
+     * Returns document path.
+     * @param path document path string
+     * @return document tree
+     * @throws WorkflowException workflow exception
+     */
+    DocumentPath getDocumentPath(String path) throws WorkflowException;
+
+    /**
+     * Transforms document tree to json tree.
+     * @return json tree
+     * @throws WorkflowException workflow exception
+     */
+    ObjectNode asJsonTree() throws WorkflowException;
+}
+
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelPointer.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelPointer.java
new file mode 100644
index 0000000..271ce4f
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelPointer.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+/**
+ * Common data model tree path.
+ */
+public interface DataModelPointer {
+
+    /**
+     * Workplace array pointer.
+     */
+    String WORKPLACES_PTR = "/workplaces";
+
+    /**
+     * Workplace name pointer.
+     */
+    String WORKPLACE_NAME_PTR = "/name";
+
+    /**
+     * Workplace data pointer.
+     */
+    String WORKPLACE_DATA_PTR = "/data";
+
+    /**
+     * Workplace workflow pointer.
+     */
+    String WORKPLACE_WORKFLOWS_PTR = "/workflows";
+
+    /**
+     * Workflow op pointer.
+     */
+    String WORKFLOW_OP_PTR = "/op";
+
+    /**
+     * Workflow id pointer.
+     */
+    String WORKFLOW_ID_PTR = "/id";
+
+    /**
+     * Workflow data pointer.
+     */
+    String WORKFLOW_DATA_PTR = "/data";
+
+    /**
+     * Gets path string.
+     * @return path string
+     */
+    String getPath();
+}
+
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelTree.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelTree.java
new file mode 100644
index 0000000..3236164
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DataModelTree.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+/**
+ * Interface for data model tree.
+ */
+public interface DataModelTree {
+
+    /**
+     * Data model tree node type (map or array).
+     */
+    enum Nodetype {
+
+        /**
+         * Map type data model tree node.
+         */
+        MAP,
+
+        /**
+         * Array type data model tree node.
+         */
+        ARRAY
+    }
+
+    /**
+     * Returns subtree on the path.
+     * @param path data model tree path
+     * @return subtree on the path
+     */
+    DataModelTree subtree(String path);
+
+    /**
+     * Attaches subtree on the path.
+     * @param path data model tree path where subtree will be attached
+     * @param tree subtree to be attached
+     * @throws WorkflowException workflow exception
+     */
+    void attach(String path, DataModelTree tree) throws WorkflowException;
+
+    /**
+     * Allocates leaf node on the path.
+     * @param path data model tree path where new leaf node will be allocated
+     * @param leaftype leaf node type
+     * @return data model tree
+     * @throws WorkflowException workflow exception
+     */
+    DataModelTree alloc(String path, Nodetype leaftype) throws WorkflowException;
+}
+
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultRpcDescription.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultRpcDescription.java
new file mode 100644
index 0000000..4a4715e
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultRpcDescription.java
@@ -0,0 +1,177 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.MissingNode;
+import com.fasterxml.jackson.databind.node.TextNode;
+import com.google.common.base.MoreObjects;
+
+/**
+ * Class of workflow RPC description.
+ */
+public final class DefaultRpcDescription implements RpcDescription {
+
+    /**
+     * Workflow RPC operation.
+     */
+    private final String op;
+
+    /**
+     * Parameters.
+     */
+    private final JsonNode params;
+
+    /**
+     * Invocation ID.
+     */
+    private final String id;
+
+    /**
+     * Constructor of workplace description.
+     * @param builder workplace builder
+     */
+    private DefaultRpcDescription(Builder builder) {
+        this.op = builder.op;
+        this.params = builder.params;
+        this.id = builder.id;
+    }
+
+    @Override
+    public String op() {
+        return this.op;
+    }
+
+    @Override
+    public JsonNode params() {
+        return this.params;
+    }
+
+    @Override
+    public String id() {
+        return this.id;
+    }
+
+    /**
+     * Creating workflow RPC description from json tree.
+     * @param root root node for workflow RPC description
+     * @return workflow RPC description
+     * @throws WorkflowException workflow exception
+     */
+    public static DefaultRpcDescription valueOf(JsonNode root) throws WorkflowException {
+
+        JsonNode node = root.at(RPC_OP_PTR);
+        if (!(node instanceof TextNode)) {
+            throw new WorkflowException("invalid RPC operation for " + root);
+        }
+        String rpcOp = node.asText();
+
+        node = root.at(RPC_PARAMS_PTR);
+        if (node instanceof MissingNode) {
+            throw new WorkflowException("invalid RPC parameters for " + root);
+        }
+        JsonNode rpcParams = node;
+
+        node = root.at(RPC_ID_PTR);
+        if (!(node instanceof TextNode)) {
+            throw new WorkflowException("invalid RPC invocation ID for " + root);
+        }
+        String rpcId = node.asText();
+
+
+        return builder()
+                .setOp(rpcOp)
+                .setParams(rpcParams)
+                .setId(rpcId)
+                .build();
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("op", op())
+                .add("params", params())
+                .add("id", id())
+                .toString();
+    }
+
+    /**
+     * Gets builder instance.
+     * @return builder instance
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder for workplace RPC description.
+     */
+    public static class Builder {
+
+        /**
+         * Workflow RPC operation.
+         */
+        private String op;
+
+        /**
+         * Parameters.
+         */
+        private JsonNode params;
+
+        /**
+         * Invocation ID.
+         */
+        private String id;
+
+        /**
+         * Sets workflow RPC operation.
+         * @param op workflow RPC operation
+         * @return builder
+         */
+        public Builder setOp(String op) {
+            this.op = op;
+            return this;
+        }
+
+        /**
+         * Sets workflow RPC parameters.
+         * @param params workflow RPC parameters
+         * @return builder
+         */
+        public Builder setParams(JsonNode params) {
+            this.params = params;
+            return this;
+        }
+
+        /**
+         * Sets workflow RPC invocation ID.
+         * @param id workflow invocation ID
+         * @return builder
+         */
+        public Builder setId(String id) {
+            this.id = id;
+            return this;
+        }
+
+        /**
+         * Builds workplace RPC description from builder.
+         * @return instance of workflow RPC description
+         */
+        public DefaultRpcDescription build() {
+            return new DefaultRpcDescription(this);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkflowContext.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkflowContext.java
new file mode 100644
index 0000000..e16376f
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkflowContext.java
@@ -0,0 +1,242 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+import org.onosproject.event.Event;
+
+import java.net.URI;
+
+/**
+ * Default implementation of WorkflowContext.
+ */
+public class DefaultWorkflowContext extends WorkflowContext {
+
+    /**
+     * ID of workflow.
+     */
+    private URI workflowId;
+
+    /**
+     * Workplace name of the workflow.
+     */
+    private String workplaceName;
+
+    /**
+     * State of workflow.
+     */
+    private WorkflowState state;
+
+    /**
+     * Current worklet of the workflow.
+     */
+    private String current;
+
+    /**
+     * Cause of workflow exception.
+     */
+    private String cause;
+
+    /**
+     * Completion event type.
+     */
+    private transient Class<? extends Event> completionEventType;
+
+    /**
+     * Completion event hint.
+     */
+    private transient String completionEventHint;
+
+    /**
+     * Completion event generator method reference.
+     */
+    private transient WorkExecutor completionEventGenerator;
+
+    /**
+     * Completion event timeout milliseconds.
+     */
+    private transient long completionEventTimeoutMs;
+
+    /**
+     * Service reference for workflow service.
+     */
+    private transient WorkflowExecutionService workflowExecutionService;
+
+    /**
+     * Service reference for workflow store.
+     */
+    private transient WorkflowStore workflowStore;
+
+    /**
+     * Service reference for workplace store.
+     */
+    private transient WorkplaceStore workplaceStore;
+
+    /**
+     * Constructor of DefaultWorkflowContext.
+     * @param workflowId ID of workflow
+     * @param workplaceName name of workplace
+     * @param data data model tree
+     */
+    public DefaultWorkflowContext(URI workflowId, String workplaceName, DataModelTree data) {
+        super(data);
+        this.workflowId = workflowId;
+        this.workplaceName = workplaceName;
+        this.state = WorkflowState.IDLE;
+        this.current = Worklet.Common.INIT.name();
+    }
+
+    /**
+     * DefaultWorkflowContext name builder.
+     * @param workflowid workflow id
+     * @param workplacename workplace name
+     * @return DefaultWorkflowContext name
+     */
+    public static String nameBuilder(URI workflowid, String workplacename) {
+        return workflowid.toString() + "@" + workplacename;
+    }
+
+    @Override
+    public String name() {
+        return nameBuilder(workflowId, workplaceName);
+    }
+
+    @Override
+    public String distributor() {
+        return workplaceName();
+    }
+
+    @Override
+    public URI workflowId() {
+        return this.workflowId;
+    }
+
+    @Override
+    public String workplaceName() {
+        return workplaceName;
+    }
+
+    @Override
+    public WorkflowState state() {
+        return state;
+    }
+
+    @Override
+    public void setState(WorkflowState state) {
+        this.state = state;
+    }
+
+    @Override
+    public String current() {
+        return this.current;
+    }
+
+    @Override
+    public void setCurrent(Worklet worklet) {
+        this.current = worklet.tag();
+    }
+
+    @Override
+    public String cause() {
+        return this.cause;
+    }
+
+    @Override
+    public void setCause(String cause) {
+        this.cause = cause;
+    }
+
+    @Override
+    public void completed() {
+        setTriggerNext(true);
+    }
+
+    @Override
+    public void waitCompletion(Class<? extends Event> eventType, String eventHint,
+                               WorkExecutor eventGenerator, long timeoutMs) {
+        this.completionEventType = eventType;
+        this.completionEventHint = eventHint;
+        this.completionEventGenerator = eventGenerator;
+        this.completionEventTimeoutMs = timeoutMs;
+    }
+
+    @Override
+    public void waitFor(long timeoutMs) {
+        this.completionEventTimeoutMs = timeoutMs;
+    }
+
+    @Override
+    public Class<? extends Event> completionEventType() {
+        return completionEventType;
+    }
+
+    @Override
+    public String completionEventHint() {
+        return completionEventHint;
+    }
+
+    @Override
+    public WorkExecutor completionEventGenerator() {
+        return completionEventGenerator;
+    }
+
+    @Override
+    public long completionEventTimeout() {
+        return completionEventTimeoutMs;
+    }
+
+    @Override
+    public void setWorkflowExecutionService(WorkflowExecutionService workflowExecutionService) {
+        this.workflowExecutionService = workflowExecutionService;
+    }
+
+    @Override
+    public WorkflowExecutionService workflowService() {
+        return workflowExecutionService;
+    }
+
+    @Override
+    public void setWorkflowStore(WorkflowStore workflowStore) {
+        this.workflowStore = workflowStore;
+    }
+
+    @Override
+    public WorkflowStore workflowStore() {
+        return workflowStore;
+    }
+
+    @Override
+    public void setWorkplaceStore(WorkplaceStore workplaceStore) {
+        this.workplaceStore = workplaceStore;
+    }
+
+    @Override
+    public WorkplaceStore workplaceStore() {
+        return workplaceStore;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("name", name())
+                .add("triggernext", triggerNext())
+                .add("data", data())
+                .add("current", current)
+                .add("state", state())
+                .add("cause", cause())
+                .toString();
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkflowDescription.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkflowDescription.java
new file mode 100644
index 0000000..c9ded60
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkflowDescription.java
@@ -0,0 +1,209 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.MissingNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.databind.node.TextNode;
+import com.google.common.base.MoreObjects;
+
+import java.net.URI;
+
+
+/**
+ * Class for default workflow description.
+ */
+public final class DefaultWorkflowDescription implements WorkflowDescription {
+
+    /**
+     * Workplace Name.
+     */
+    private String workplaceName;
+
+    /**
+     * Workflow ID.
+     */
+    private URI id;
+
+    /**
+     * Workflow data model.
+     */
+    private JsonNode data;
+
+    /**
+     * Constructor of workflow description.
+     * @param builder workflow description builder
+     */
+    private DefaultWorkflowDescription(Builder builder) {
+        this.workplaceName = builder.workplaceName;
+        this.id = builder.id;
+        this.data = builder.data;
+    }
+
+    @Override
+    public String workplaceName() {
+        return this.workplaceName;
+    }
+
+    @Override
+    public URI id() {
+        return this.id;
+    }
+
+    @Override
+    public String workflowContextName() {
+        return DefaultWorkflowContext.nameBuilder(id(), workplaceName());
+    }
+
+    @Override
+    public JsonNode data() {
+        return this.data;
+    }
+
+    /**
+     * Creating workflow description from json tree.
+     * @param root root node for workflow description
+     * @return workflow description
+     * @throws WorkflowException workflow exception
+     */
+    public static DefaultWorkflowDescription valueOf(JsonNode root) throws WorkflowException {
+
+        JsonNode node = root.at(ptr(WF_WORKPLACE));
+        if (!(node instanceof TextNode)) {
+            throw new WorkflowException("invalid workflow workplace for " + root);
+        }
+        String wfWorkplaceName = node.asText();
+
+        node = root.at(ptr(WF_ID));
+        if (!(node instanceof TextNode)) {
+            throw new WorkflowException("invalid workflow id for " + root);
+        }
+        URI wfId = URI.create(node.asText());
+
+        node = root.at(ptr(WF_DATA));
+        if (node instanceof MissingNode) {
+            throw new WorkflowException("invalid workflow data for " + root);
+        }
+        JsonNode wfData = node;
+
+        return builder()
+                .workplaceName(wfWorkplaceName)
+                .id(wfId)
+                .data(wfData)
+                .build();
+    }
+
+    private static String ptr(String field) {
+        return "/" + field;
+    }
+
+    @Override
+    public JsonNode toJson() {
+        ObjectNode root = JsonNodeFactory.instance.objectNode();
+        root.put(WF_WORKPLACE, workplaceName());
+        root.put(WF_ID, id().toString());
+        root.put(WF_DATA, data());
+        return root;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("workplace", workplaceName())
+                .add("id", id())
+                .add("data", data())
+                .toString();
+    }
+
+    /**
+     * Gets builder instance.
+     * @return builder instance
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder for workflow description.
+     */
+    public static class Builder {
+
+        /**
+         * Workplace name.
+         */
+        private String workplaceName;
+
+        /**
+         * Workflow ID.
+         */
+        private URI id;
+
+        /**
+         * Workflow data model.
+         */
+        private JsonNode data;
+
+        /**
+         * Sets workplace name.
+         * @param workplaceName workplace name
+         * @return builder
+         */
+        public Builder workplaceName(String workplaceName) {
+            this.workplaceName = workplaceName;
+            return this;
+        }
+
+        /**
+         * Sets workflow id.
+         * @param id workflow ID
+         * @return builder
+         */
+        public Builder id(URI id) {
+            this.id = id;
+            return this;
+        }
+
+        /**
+         * Sets workflow id.
+         * @param id workflow ID string
+         * @return builder
+         */
+        public Builder id(String id) {
+            this.id = URI.create(id);
+            return this;
+        }
+
+        /**
+         * Sets workflow data model.
+         * @param data workflow data model
+         * @return builder
+         */
+        public Builder data(JsonNode data) {
+            this.data = data;
+            return this;
+        }
+
+        /**
+         * Builds workflow description from builder.
+         * @return instance of workflow description
+         */
+        public DefaultWorkflowDescription build() {
+            return new DefaultWorkflowDescription(this);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkplace.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkplace.java
new file mode 100644
index 0000000..1c60eaf
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkplace.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+import org.onlab.osgi.DefaultServiceDirectory;
+import org.onlab.osgi.ServiceNotFoundException;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.stream.Collectors;
+
+/**
+ * Default implementation of workplace.
+ */
+public class DefaultWorkplace extends Workplace {
+
+    /**
+     * Name of workplace.
+     */
+    private String name;
+
+    /**
+     * Constructor of DefaultWorkplace.
+     * @param name name of workplace
+     * @param data data model tree
+     */
+    public DefaultWorkplace(String name, DataModelTree data) {
+        super(data);
+        this.name = name;
+    }
+
+    @Override
+    public String name() {
+        return this.name;
+    }
+
+    @Override
+    public String distributor() {
+        return name();
+    }
+
+    @Override
+    public Collection<WorkflowContext> getContexts() throws WorkflowException {
+        WorkplaceStore workplaceStore;
+        try {
+            workplaceStore = DefaultServiceDirectory.getService(WorkplaceStore.class);
+        } catch (ServiceNotFoundException e) {
+            throw new WorkflowException(e);
+        }
+
+        return workplaceStore.getWorkplaceContexts(name());
+    }
+
+    /**
+     * Returns collection of context names.
+     * @return collection of context names
+     */
+    private Collection<String> getContextNames() {
+        Collection<WorkflowContext> ctx;
+        try {
+            ctx = getContexts();
+        } catch (WorkflowException e) {
+            ctx = Collections.emptyList();
+        }
+
+        return ctx.stream().map(x -> x.name()).collect(Collectors.toList());
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("name", name())
+                .add("triggernext", triggerNext())
+                .add("context", data())
+                .add("contexts", getContextNames())
+                .toString();
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkplaceDescription.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkplaceDescription.java
new file mode 100644
index 0000000..95da550
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/DefaultWorkplaceDescription.java
@@ -0,0 +1,169 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.MissingNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.databind.node.TextNode;
+import com.google.common.base.MoreObjects;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Class for default workplace description.
+ */
+public final class DefaultWorkplaceDescription implements WorkplaceDescription {
+
+    /**
+     * Name of workplace.
+     */
+    private final String name;
+
+    /**
+     * Data model of workplace(Optional).
+     */
+    private final Optional<JsonNode> optData;
+
+    /**
+     * Constructor of workplace description.
+     * @param builder workplace builder
+     */
+    private DefaultWorkplaceDescription(Builder builder) {
+        this.name = builder.name;
+        this.optData = builder.optData;
+    }
+
+    @Override
+    public String name() {
+        return this.name;
+    }
+
+    @Override
+    public Optional<JsonNode> data() {
+        return this.optData;
+    }
+
+    /**
+     * Creating workplace description from json tree.
+     * @param root root node for workplace description
+     * @return workplace description
+     * @throws WorkflowException workflow exception
+     */
+    public static DefaultWorkplaceDescription valueOf(JsonNode root) throws WorkflowException {
+
+        JsonNode node = root.at(ptr(WP_NAME));
+        if (!(node instanceof TextNode)) {
+            throw new WorkflowException("invalid workplace name for " + root);
+        }
+
+        Builder builder = builder()
+            .name(node.asText());
+
+        node = root.at(ptr(WP_DATA));
+        if (node != null && !(node instanceof MissingNode)) {
+            if (!(node instanceof ObjectNode) && !(node instanceof ArrayNode)) {
+                throw new WorkflowException("invalid workplace data for " + root);
+            }
+            builder.data(node);
+        }
+
+        return builder.build();
+    }
+
+    private static String ptr(String field) {
+        return "/" + field;
+    }
+
+    @Override
+    public JsonNode toJson() {
+        ObjectNode root = JsonNodeFactory.instance.objectNode();
+        root.put(WP_NAME, name());
+        if (data().isPresent()) {
+            root.put(WP_DATA, data().get());
+        }
+        return root;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("name", name())
+                .add("optData", data())
+                .toString();
+    }
+
+    /**
+     * Gets builder instance.
+     * @return builder instance
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder for workplace description.
+     */
+    public static class Builder {
+
+        /**
+         * Workplace name.
+         */
+        private String name;
+
+        /**
+         * Workplace optData model.
+         */
+        private Optional<JsonNode> optData = Optional.empty();
+
+        /**
+         * List of workflow.
+         */
+        private List<DefaultWorkflowDescription> workflowDescs = new ArrayList<DefaultWorkflowDescription>();
+
+        /**
+         * Sets workplace name.
+         * @param name workplace name
+         * @return builder
+         */
+        public Builder name(String name) {
+            this.name = name;
+            return this;
+        }
+
+        /**
+         * Sets optData model.
+         * @param data workplace optData model
+         * @return builder
+         */
+        public Builder data(JsonNode data) {
+            this.optData = Optional.of(data);
+            return this;
+        }
+
+        /**
+         * Builds workplace description from builder.
+         * @return instance of workflow description
+         */
+        public DefaultWorkplaceDescription build() {
+            return new DefaultWorkplaceDescription(this);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventHintSupplier.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventHintSupplier.java
new file mode 100644
index 0000000..076bfc0
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventHintSupplier.java
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import org.onosproject.event.Event;
+
+/**
+ * Functional interface for delivering event hint supplier.
+ */
+@FunctionalInterface
+public interface EventHintSupplier {
+    String apply(Event event) throws Throwable;
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventTask.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventTask.java
new file mode 100644
index 0000000..3b2b30a
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventTask.java
@@ -0,0 +1,163 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+import org.onosproject.event.Event;
+
+import java.util.Objects;
+
+/**
+ * Class for event task.
+ */
+public final class EventTask extends HandlerTask {
+
+    /**
+     * Event triggering event task.
+     */
+    private final Event event;
+
+    /**
+     * Event hint value for finding target event.
+     */
+    private final String eventHint;
+
+    /**
+     * Constructor of event task.
+     * @param builder builder of event task
+     */
+    private EventTask(Builder builder) {
+        super(builder);
+        this.event = builder.event;
+        this.eventHint = builder.eventHint;
+    }
+
+    /**
+     * Gets event of event task.
+     * @return event triggering event task
+     */
+    public Event event() {
+        return event;
+    }
+
+    /**
+     * Gets event type (class name of event) of event task.
+     * @return event type
+     */
+    public String eventType() {
+        return event.getClass().getName();
+    }
+
+    /**
+     * Gets event hint of event task.
+     * @return event hint string
+     */
+    public String eventHint() {
+        return eventHint;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.toString());
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof EventTask)) {
+            return false;
+        }
+        return Objects.equals(this.event(), ((EventTask) obj).event())
+                && Objects.equals(this.eventType(), ((EventTask) obj).eventType())
+                && Objects.equals(this.eventHint(), ((EventTask) obj).eventHint());
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("context", context())
+                .add("workletType", workletType())
+                .add("event", event())
+                .add("eventHint", eventHint())
+                .toString();
+    }
+
+    /**
+     * Gets a instance of builder.
+     * @return instance of builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder of EventTask.
+     */
+    public static class Builder extends HandlerTask.Builder {
+
+        /**
+         * Event triggering event task.
+         */
+        private Event event;
+
+        /**
+         * Event hint value for finding target event.
+         */
+        private String eventHint;
+
+        /**
+         * Sets event.
+         * @param event event triggering event task
+         * @return Builder of EventTask
+         */
+        public Builder event(Event event) {
+            this.event = event;
+            return this;
+        }
+
+        /**
+         * Sets event hint.
+         * @param eventHint event hint value for finding target event
+         * @return Builder of EventTask
+         */
+        public Builder eventHint(String eventHint) {
+            this.eventHint = eventHint;
+            return this;
+        }
+
+        @Override
+        public Builder context(WorkflowContext context) {
+            super.context(context);
+            return this;
+        }
+
+        @Override
+        public Builder workletType(String workletType) {
+            super.workletType(workletType);
+            return this;
+        }
+
+        /**
+         * Builds EventTask.
+         * @return instance of EventTask
+         */
+        public EventTask build() {
+            return new EventTask(this);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventTimeoutTask.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventTimeoutTask.java
new file mode 100644
index 0000000..92516d4
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventTimeoutTask.java
@@ -0,0 +1,152 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+
+import java.util.Objects;
+
+/**
+ * Class for event timeout task.
+ */
+public final class EventTimeoutTask extends HandlerTask {
+
+    /**
+     * Event type (Class name of event).
+     */
+    private final String eventType;
+
+    /**
+     * Event hint value for finding target event.
+     */
+    private final String eventHint;
+
+    /**
+     * Constructor of EventTimeoutTask.
+     * @param builder builder of EventTimeoutTask
+     */
+    private EventTimeoutTask(Builder builder) {
+        super(builder);
+        this.eventType = builder.eventType;
+        this.eventHint = builder.eventHint;
+    }
+
+    /**
+     * Gets event type (Class name of event).
+     * @return event type
+     */
+    public String eventType() {
+        return eventType;
+    }
+
+    /**
+     * Gets event hint value for finding target event.
+     * @return event hint string
+     */
+    public String eventHint() {
+        return eventHint;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.toString());
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof EventTask)) {
+            return false;
+        }
+        return Objects.equals(this.eventType(), ((EventTask) obj).eventType())
+                && Objects.equals(this.eventHint(), ((EventTask) obj).eventHint());
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("context", context())
+                .add("workletType", workletType())
+                .add("eventType", eventType())
+                .add("eventHint", eventHint())
+                .toString();
+    }
+
+    /**
+     * Gets a instance of builder.
+     * @return instance of builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder of EventTimeoutTask.
+     */
+    public static class Builder extends HandlerTask.Builder {
+        /**
+         * Event type (Class name of event).
+         */
+        private String eventType;
+
+        /**
+         * Event hint value for finding target event.
+         */
+        private String eventHint;
+
+        /**
+         * Sets Event type (Class name of event).
+         * @param eventType event type
+         * @return builder of EventTimeoutTask
+         */
+        public Builder eventType(String eventType) {
+            this.eventType = eventType;
+            return this;
+        }
+
+        /**
+         * Sets event hint string for finding target event.
+         * @param eventHint event hint string
+         * @return builder of EventTimeoutTask
+         */
+        public Builder eventHint(String eventHint) {
+            this.eventHint = eventHint;
+            return this;
+        }
+
+        @Override
+        public Builder context(WorkflowContext context) {
+            super.context(context);
+            return this;
+        }
+
+        @Override
+        public Builder workletType(String workletType) {
+            super.workletType(workletType);
+            return this;
+        }
+
+        /**
+         * Builds EventTimeoutTask.
+         * @return instance of EventTimeoutTask
+         */
+        public EventTimeoutTask build() {
+            return new EventTimeoutTask(this);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/HandlerTask.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/HandlerTask.java
new file mode 100644
index 0000000..106466b
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/HandlerTask.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+
+/**
+ * Abstract class for handler task.
+ */
+public abstract class HandlerTask {
+
+    /**
+     * Workflow context of handler task.
+     */
+    private final WorkflowContext context;
+
+    /**
+     * Worklet type of handler task.
+     */
+    private final String workletType;
+
+    /**
+     * Constructor for handler task.
+     * @param builder handler task builder
+     */
+    protected HandlerTask(Builder builder) {
+        this.context = builder.context;
+        this.workletType = builder.workletType;
+    }
+
+    /**
+     * Returns workflow context of this handler task.
+     * @return workflow context
+     */
+    public WorkflowContext context() {
+        return context;
+    }
+
+    /**
+     * Returns worklet type name of this handler task.
+     * @return worklet type
+     */
+    public String workletType() {
+        return workletType;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("context", context())
+                .add("workletType", workletType())
+                .toString();
+    }
+
+    /**
+     * Builder of HandlerTask.
+     */
+    public static class Builder {
+        protected WorkflowContext context;
+        protected String workletType;
+
+        /**
+         * Sets workflow context of handler task.
+         * @param context workflow context
+         * @return builder of handler task
+         */
+        public Builder context(WorkflowContext context) {
+            this.context = context;
+            return this;
+        }
+
+        /**
+         * Sets worklet type of handler task.
+         * @param workletType worklet type
+         * @return builder of handler task
+         */
+        public Builder workletType(String workletType) {
+            this.workletType = workletType;
+            return this;
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/HandlerTaskBatchDelegate.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/HandlerTaskBatchDelegate.java
new file mode 100644
index 0000000..c5859f2
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/HandlerTaskBatchDelegate.java
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import java.util.Collection;
+
+/**
+ * Facade for receiving notifications from the handler task batch service.
+ */
+public interface HandlerTaskBatchDelegate {
+
+    /**
+     * Submits the specified batch of handler task operations for processing.
+     *
+     * @param operations batch of operations
+     */
+    void execute(Collection<Collection<HandlerTask>> operations);
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/ImmutableListWorkflow.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/ImmutableListWorkflow.java
new file mode 100644
index 0000000..b5ea456
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/ImmutableListWorkflow.java
@@ -0,0 +1,288 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import org.onlab.osgi.DefaultServiceDirectory;
+import org.onlab.osgi.ServiceNotFoundException;
+
+import java.lang.reflect.Modifier;
+import java.net.URI;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * Class for immutable list workflow.
+ */
+public final class ImmutableListWorkflow extends AbstractWorkflow {
+
+    /**
+     * Init worklet type(class name of init worklet type).
+     */
+    private String initWorkletType;
+
+    /**
+     * List of worklet.
+     */
+    private List<String> workletTypeList;
+
+    /**
+     * Set of workflow attributes.
+     */
+    private Set<WorkflowAttribute> attributes;
+
+    /**
+     * Constructor of ImmutableListWorkflow.
+     * @param builder builder of ImmutableListWorkflow
+     */
+    private ImmutableListWorkflow(Builder builder) {
+        super(builder.id);
+        this.initWorkletType = builder.initWorkletType;
+        workletTypeList = ImmutableList.copyOf(builder.workletTypeList);
+        attributes = ImmutableSet.copyOf(builder.attributes);
+    }
+
+    @Override
+    public Worklet init(WorkflowContext context) throws WorkflowException {
+        if (Objects.isNull(initWorkletType)) {
+            return null;
+        }
+
+        return getWorkletInstance(initWorkletType);
+    }
+
+
+    @Override
+    public Worklet next(WorkflowContext context) throws WorkflowException {
+
+        int cnt = 0;
+        for (int i = 0; i < workletTypeList.size(); i++) {
+
+            if (cnt++ > Worklet.MAX_WORKS) {
+                throw new WorkflowException("Maximum worklet execution exceeded");
+            }
+
+            String workletType = workletTypeList.get(i);
+
+            if (Worklet.Common.COMPLETED.tag().equals(workletType)) {
+                return Worklet.Common.COMPLETED;
+            }
+
+            if (Worklet.Common.INIT.tag().equals(workletType)) {
+                continue;
+            }
+
+            Worklet worklet = getWorkletInstance(workletType);
+            Class workClass = worklet.getClass();
+
+            if (BranchWorklet.class.isAssignableFrom(workClass)) {
+                Class nextClass = ((BranchWorklet) worklet).next(context);
+                if (nextClass == null) {
+                    throw new WorkflowException("Invalid next Worklet for " + workClass);
+                }
+
+                // TODO : it does not support duplicated use of WorkType. It needs to consider label concept
+                int nextIdx = getClassIndex(nextClass);
+                if (nextIdx == -1) {
+                    throw new WorkflowException("Failed to find next " + nextClass + " for " + workClass);
+                }
+
+                i = nextIdx;
+                continue;
+
+            } else {
+                if (worklet.isNext(context)) {
+                    return worklet;
+                }
+            }
+        }
+        return Worklet.Common.COMPLETED;
+    }
+
+    @Override
+    public Worklet getWorkletInstance(String workletType) throws WorkflowException {
+
+        WorkflowStore store;
+        try {
+             store = DefaultServiceDirectory.getService(WorkflowStore.class);
+        } catch (ServiceNotFoundException e) {
+            throw new WorkflowException(e);
+        }
+
+        Class workClass;
+        try {
+            workClass = store.getClass(workletType);
+        } catch (ClassNotFoundException e) {
+            throw new WorkflowException(e);
+        }
+
+        if (!isAllowed(workClass)) {
+            throw new WorkflowException("Not allowed class(" + workClass.getSimpleName() + ")");
+        }
+
+        Worklet worklet;
+        try {
+            worklet = (Worklet) workClass.newInstance();
+        } catch (Exception e) {
+            throw new WorkflowException(e);
+        }
+
+        return worklet;
+    }
+
+    @Override
+    public Set<WorkflowAttribute> attributes() {
+        return ImmutableSet.copyOf(attributes);
+    }
+
+    /**
+     * Gets index of class in worklet type list.
+     * @param aClass class to get index
+     * @return index of class in worklet type list
+     */
+    private int getClassIndex(Class aClass) {
+        for (int i = 0; i < workletTypeList.size(); i++) {
+            if (Objects.equals(aClass.getName(), workletTypeList.get(i))) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    /**
+     * Checks whether class is allowed class or not.
+     * @param clazz class to check
+     * @return Check result
+     */
+    private boolean isAllowed(Class clazz) {
+        // non static inner class is not allowed
+        if (clazz.isMemberClass() && !Modifier.isStatic(clazz.getModifiers())) {
+            return false;
+        }
+        // enum is not allowed
+        if (clazz.isEnum()) {
+            return false;
+        }
+        // class should be subclass of Work
+        if (!Worklet.class.isAssignableFrom(clazz)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(this.toString());
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) {
+            return true;
+        }
+        if (!(obj instanceof EventTask)) {
+            return false;
+        }
+        return Objects.equals(this.id(), ((ImmutableListWorkflow) obj).id())
+                && Objects.equals(this.initWorkletType, ((ImmutableListWorkflow) obj).initWorkletType)
+                && Objects.equals(this.workletTypeList, ((ImmutableListWorkflow) obj).workletTypeList)
+                && Objects.equals(this.attributes, ((ImmutableListWorkflow) obj).attributes);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("id", id())
+                .add("initWorklet", initWorkletType)
+                .add("workList", workletTypeList)
+                .add("attributes", attributes)
+                .toString();
+    }
+
+    /**
+     * Gets a instance of builder.
+     * @return instance of builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder of ImmutableListWorkflow.
+     */
+    public static class Builder {
+
+        private URI id;
+        private String initWorkletType;
+        private final List<String> workletTypeList = Lists.newArrayList();
+        private final Set<WorkflowAttribute> attributes = Sets.newHashSet();
+
+        /**
+         * Sets id of immutable list workflow.
+         * @param uri id of immutable list workflow
+         * @return builder
+         */
+        public Builder id(URI uri) {
+            this.id = uri;
+            workletTypeList.add(Worklet.Common.INIT.tag());
+            return this;
+        }
+
+        /**
+         * Sets init worklet class name of immutable list workflow.
+         * @param workletClassName class name of worklet
+         * @return builder
+         */
+        public Builder init(String workletClassName) {
+            this.initWorkletType = workletClassName;
+            return this;
+        }
+
+        /**
+         * Chains worklet class name of immutable list workflow.
+         * @param workletClassName class name of worklet
+         * @return builder
+         */
+        public Builder chain(String workletClassName) {
+            workletTypeList.add(workletClassName);
+            return this;
+        }
+
+        /**
+         * Adds workflow attribute.
+         * @param attribute workflow attribute to be added
+         * @return builder
+         */
+        public Builder attribute(WorkflowAttribute attribute) {
+            attributes.add(attribute);
+            return this;
+        }
+
+        /**
+         * Builds ImmutableListWorkflow.
+         * @return instance of ImmutableListWorkflow
+         */
+        public ImmutableListWorkflow build() {
+            workletTypeList.add(Worklet.Common.COMPLETED.tag());
+            return new ImmutableListWorkflow(this);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/JsonDataModelTree.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/JsonDataModelTree.java
new file mode 100644
index 0000000..3a74bd2
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/JsonDataModelTree.java
@@ -0,0 +1,319 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+
+import com.fasterxml.jackson.core.JsonPointer;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.JsonNodeType;
+import com.fasterxml.jackson.databind.node.MissingNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.base.MoreObjects;
+
+import java.util.Objects;
+
+/**
+ * Class for json data model tree.
+ */
+public final class JsonDataModelTree implements DataModelTree {
+
+    /**
+     * Root node of json data model tree.
+     */
+    private JsonNode root;
+
+    /**
+     * Constructor of JsonDataModelTree.
+     */
+    public JsonDataModelTree() {
+        this.root = JsonNodeFactory.instance.objectNode();
+    }
+
+    /**
+     * Constructor of JsonDataModelTree.
+     * @param root root node of json data model tree
+     */
+    public JsonDataModelTree(JsonNode root) {
+        this.root = root;
+    }
+
+    @Override
+    public DataModelTree subtree(String path) {
+        JsonNode node = root.at(path);
+        if (Objects.isNull(node) || node.isMissingNode()) {
+            return null;
+        }
+        return new JsonDataModelTree(node);
+    }
+
+    @Override
+    public void attach(String path, DataModelTree tree) throws WorkflowException {
+        if (root == null || root instanceof MissingNode) {
+            throw new WorkflowException("Invalid root node");
+        }
+
+        JsonPointer ptr = JsonPointer.compile(path);
+        JsonNode node = root.at(ptr);
+        if (!(node instanceof MissingNode)) {
+            throw new WorkflowException("Path(" + path + ") has already subtree(" + node + ")");
+        }
+
+        if (!(tree instanceof JsonDataModelTree)) {
+            throw new WorkflowException("Invalid subTree(" + tree + ")");
+        }
+        JsonNode attachingNode = ((JsonDataModelTree) tree).root();
+
+        alloc(ptr.head(), Nodetype.MAP);
+        JsonNode parentNode = root.at(ptr.head());
+
+        if (!parentNode.isObject()) {
+            throw new WorkflowException("Invalid parentNode type(" + parentNode.getNodeType() + ")");
+        }
+
+        String key = ptr.last().getMatchingProperty();
+        ((ObjectNode) parentNode).put(key, attachingNode);
+    }
+
+    @Override
+    public JsonDataModelTree alloc(String path, Nodetype leaftype) throws WorkflowException {
+        if (root == null || root instanceof MissingNode) {
+            throw new WorkflowException("Invalid root node");
+        }
+
+        JsonPointer ptr = JsonPointer.compile(path);
+        return alloc(ptr, leaftype);
+    }
+
+    /**
+     * Allocates json data model tree on json pointer path with specific leaf type.
+     * @param ptr json pointer to allocate
+     * @param leaftype type of leaf node
+     * @return json data model tree
+     * @throws WorkflowException workflow exception
+     */
+    private JsonDataModelTree alloc(JsonPointer ptr, Nodetype leaftype) throws WorkflowException {
+        if (root == null || root instanceof MissingNode) {
+            throw new WorkflowException("Invalid root node");
+        }
+
+        switch (leaftype) {
+            case MAP:
+                alloc(root, ptr, JsonNodeType.OBJECT);
+                break;
+            case ARRAY:
+                alloc(root, ptr, JsonNodeType.ARRAY);
+                break;
+            default:
+                throw new WorkflowException("Not supported leaftype(" + leaftype + ")");
+        }
+        return this;
+    }
+
+    /**
+     * Gets root json node.
+     * @return root json node
+     * @throws WorkflowException workflow exception
+     */
+    public JsonNode root() throws WorkflowException {
+        return nodeAt("");
+    }
+
+    /**
+     * Gets root json node as ObjectNode (MAP type).
+     * @return root json node as ObjectNode
+     * @throws WorkflowException workflow exception
+     */
+    public ObjectNode rootObject() throws WorkflowException {
+        return objectAt("");
+    }
+
+    /**
+     * Gets root json node as ArrayNode (Array type).
+     * @return root json node as ArrayNode
+     * @throws WorkflowException workflow exception
+     */
+    public ArrayNode rootArray() throws WorkflowException {
+        return arrayAt("");
+    }
+
+    /**
+     * Gets json node on specific path.
+     * @param path path of json node
+     * @return json node on specific path
+     * @throws WorkflowException workflow exception
+     */
+    public JsonNode nodeAt(String path) throws WorkflowException {
+        JsonPointer ptr = JsonPointer.compile(path);
+        return nodeAt(ptr);
+    }
+
+    /**
+     * Gets json node on specific json pointer.
+     * @param ptr json pointer
+     * @return json node on specific json pointer.
+     * @throws WorkflowException workflow exception
+     */
+    public JsonNode nodeAt(JsonPointer ptr) throws WorkflowException {
+        if (root == null || root instanceof MissingNode) {
+            throw new WorkflowException("Invalid root node");
+        }
+        JsonNode node = root.at(ptr);
+        return node;
+    }
+
+    /**
+     * Gets json node on specific path as ObjectNode.
+     * @param path path of json node
+     * @return ObjectNode type json node on specific path
+     * @throws WorkflowException workflow exception
+     */
+    public ObjectNode objectAt(String path) throws WorkflowException {
+        JsonPointer ptr = JsonPointer.compile(path);
+        return objectAt(ptr);
+    }
+
+    /**
+     * Gets json node on specific json pointer as ObjectNode.
+     * @param ptr json pointer
+     * @return ObjectNode type json node on specific json pointer.
+     * @throws WorkflowException workflow exception
+     */
+    public ObjectNode objectAt(JsonPointer ptr) throws WorkflowException {
+        if (root == null || root instanceof MissingNode) {
+            throw new WorkflowException("Invalid root node");
+        }
+        JsonNode node = root.at(ptr);
+        if (!(node instanceof ObjectNode)) {
+            throw new WorkflowException("Invalid node(" + node + ") at " + ptr);
+        }
+        return (ObjectNode) node;
+    }
+
+    /**
+     * Gets json node on specific path as ArrayNode.
+     * @param path path of json node
+     * @return ArrayNode type json node on specific path
+     * @throws WorkflowException workflow exception
+     */
+    public ArrayNode arrayAt(String path) throws WorkflowException {
+        JsonPointer ptr = JsonPointer.compile(path);
+        return arrayAt(ptr);
+    }
+
+    /**
+     * Gets json node on specific json pointer as ArrayNode.
+     * @param ptr json pointer
+     * @return ArrayNode type json node on specific json pointer.
+     * @throws WorkflowException workflow exception
+     */
+    public ArrayNode arrayAt(JsonPointer ptr) throws WorkflowException {
+        if (root == null || root instanceof MissingNode) {
+            throw new WorkflowException("Invalid root node");
+        }
+        JsonNode node = root.at(ptr);
+        if (!(node instanceof ArrayNode)) {
+            throw new WorkflowException("Invalid node(" + node + ") at " + ptr);
+        }
+        return (ArrayNode) node;
+    }
+
+    /**
+     * Allocates json data model tree on json pointer path with specific leaf type.
+     * @param node current json node in the json tree path
+     * @param ptr json pointer
+     * @param leaftype leaf type to be allocated
+     * @return allocated json node
+     * @throws WorkflowException workflow exception
+     */
+    private JsonNode alloc(JsonNode node, JsonPointer ptr, JsonNodeType leaftype) throws WorkflowException {
+
+        if (ptr.matches()) {
+            if (node instanceof MissingNode) {
+                node = createEmpty(leaftype);
+            } else {
+                //TODO: checking existing node type is matched with leaftype
+                if (Objects.equals(node.getNodeType(), leaftype)) {
+                    throw new WorkflowException("Requesting leaftype(" + leaftype + ") is not matched with "
+                            + "existing nodetype(" + node.getNodeType() + ") for " + ptr);
+                }
+            }
+            return node;
+        }
+
+        if (ptr.getMatchingIndex() != -1) {
+            if (node instanceof MissingNode) {
+                node = createEmpty(JsonNodeType.ARRAY);
+            }
+            JsonNode child = alloc(node.get(ptr.getMatchingIndex()), ptr.tail(), leaftype);
+            if (!node.has(ptr.getMatchingIndex())) {
+                ((ArrayNode) node).insert(ptr.getMatchingIndex(), child);
+            }
+        } else if (ptr.getMatchingProperty() != null) {
+            if (node instanceof MissingNode) {
+                node = createEmpty(JsonNodeType.OBJECT);
+            }
+            JsonNode child = alloc(node.get(ptr.getMatchingProperty()), ptr.tail(), leaftype);
+            if (!node.has(ptr.getMatchingProperty())) {
+                ((ObjectNode) node).put(ptr.getMatchingProperty(), child);
+            }
+        }
+        return node;
+    }
+
+    /**
+     * Creating empty json node.
+     * @param type json node type to create
+     * @return created json node
+     * @throws WorkflowException workflow exception
+     */
+    private JsonNode createEmpty(JsonNodeType type) throws WorkflowException {
+        if (type == JsonNodeType.OBJECT) {
+            return JsonNodeFactory.instance.objectNode();
+        } else if (type == JsonNodeType.ARRAY) {
+            return JsonNodeFactory.instance.arrayNode();
+        } else if (type == JsonNodeType.STRING) {
+            return JsonNodeFactory.instance.textNode("");
+        } else {
+            throw new WorkflowException("Not supported JsonNodetype(" + type + ")");
+        }
+    }
+
+    /**
+     * Gets the pretty json formatted string of this json data model tree.
+     * @return pretty json formatted string of this json data model tree
+     */
+    public String formattedRootString() {
+        String str = "";
+        try {
+            str = (new ObjectMapper()).writerWithDefaultPrettyPrinter().writeValueAsString(root);
+        } catch (JsonProcessingException e) {
+            e.printStackTrace();
+        }
+        return str;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("json", formattedRootString())
+                .toString();
+    }
+}
+
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/RpcDescription.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/RpcDescription.java
new file mode 100644
index 0000000..5b067b4
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/RpcDescription.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * Interface for workflow RPC description.
+ */
+public interface RpcDescription {
+
+    /**
+     * Workflow RPC operation pointer.
+     */
+    String RPC_OP_PTR = "/op";
+
+    /**
+     * Workflow RPC parameters pointer.
+     */
+    String RPC_PARAMS_PTR = "/params";
+
+    /**
+     * Workflow RPC invocation ID pointer.
+     */
+    String RPC_ID_PTR = "/id";
+
+    /**
+     * Returns workflow RPC operation.
+     * @return workflow RPC operation
+     */
+    String op();
+
+    /**
+     * Returns workflow RPC parameters.
+     * @return workflow RPC parameters
+     */
+    JsonNode params();
+
+    /**
+     * Returns workflow RPC invocation ID.
+     * @return workflow RPC invocation ID
+     */
+    String id();
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/SystemWorkflowContext.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/SystemWorkflowContext.java
new file mode 100644
index 0000000..5642c97
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/SystemWorkflowContext.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+
+import java.net.URI;
+
+/**
+ * WorkflowContext for system workflow.
+ */
+public class SystemWorkflowContext extends DefaultWorkflowContext {
+
+    /**
+     * Timestamp when this system workflow context was created.
+     */
+    private final long timestamp;
+
+    /**
+     * Distributor string for designating which onos node executes this workflow context with work partition.
+     */
+    private String distributor;
+
+    /**
+     * The constructor of SystemWorkflowContext.
+     * @param workflowId id of workflow
+     * @param workplaceName workplace name
+     * @param data data model tree
+     */
+    public SystemWorkflowContext(URI workflowId, String workplaceName, DataModelTree data) {
+        super(workflowId, workplaceName, data);
+        timestamp = System.currentTimeMillis();
+        //initial distributor(It can be changed)
+        distributor = name();
+    }
+
+    @Override
+    public String distributor() {
+        return distributor;
+    }
+
+    /**
+     * Sets distributor string of this workflow context.
+     * @param distributor distributor string
+     */
+    public void setDistributor(String distributor) {
+        this.distributor = distributor;
+    }
+
+    @Override
+    public String name() {
+        return workflowId().toString()
+                + ":" + timestamp
+                + "@" + workplaceName();
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("name", name())
+                .add("triggernext", triggerNext())
+                .add("data", data())
+                .add("current", current())
+                .add("state", state())
+                .add("cause", cause())
+                .toString();
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimeoutTask.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimeoutTask.java
new file mode 100644
index 0000000..5b98bd1
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimeoutTask.java
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.base.MoreObjects;
+
+
+public final class TimeoutTask extends HandlerTask {
+
+    private TimeoutTask(Builder builder) {
+        super(builder);
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("context", context())
+                .add("workletType", workletType())
+                .toString();
+    }
+
+    /**
+     * Gets a instance of builder.
+     * @return instance of builder
+     */
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    /**
+     * Builder of TimeoutTask.
+     */
+    public static class Builder extends HandlerTask.Builder {
+        @Override
+        public Builder context(WorkflowContext context) {
+            super.context(context);
+            return this;
+        }
+
+        @Override
+        public Builder workletType(String workletType) {
+            super.workletType(workletType);
+            return this;
+        }
+
+        /**
+         * Builds TimeoutTask.
+         * @return instance of TimeoutTask
+         */
+        public TimeoutTask build() {
+            return new TimeoutTask(this);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimerChain.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimerChain.java
new file mode 100644
index 0000000..33c6aa3
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimerChain.java
@@ -0,0 +1,223 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import java.util.Date;
+import java.util.PriorityQueue;
+import java.util.Timer;
+import java.util.TimerTask;
+
+/**
+ * Class for time chain timer.
+ */
+public class TimerChain {
+
+    private PriorityQueue<TimerChainTask> taskQueue = new PriorityQueue<>();
+
+    private Timer impendingTimer;
+    private TimerChainTask impendingTask;
+
+    /**
+     * Schedules timer event.
+     * @param afterMs millisecond which time event happens.
+     * @param runnable runnable to be executed after 'afterMs'
+     */
+    public void schedule(long afterMs, Runnable runnable) {
+        schedule(new Date((new Date()).getTime() + afterMs), runnable);
+    }
+
+    /**
+     * Schedules timer event.
+     * @param date date which timer event happens.
+     * @param runnable runnable to be executed on 'date'
+     */
+    public void schedule(Date date, Runnable runnable) {
+        schedule(new TimerChainTask(this, date, runnable));
+    }
+
+    /**
+     * Schedule timer chain task.
+     * @param task task to be scheduled.
+     */
+    private void schedule(TimerChainTask task) {
+        synchronized (this) {
+            if (taskQueue.size() == 0) {
+                scheduleImpending(task);
+                return;
+            }
+
+            if (task.date().getTime() < head().date().getTime()) {
+                impendingTimer.cancel();
+                impendingTask.cancel();
+                TimerChainTask prevImpendingTask = pop().copy();
+                taskQueue.offer(prevImpendingTask);
+
+                scheduleImpending(task);
+            } else {
+                taskQueue.offer(task);
+            }
+        }
+    }
+
+    /**
+     * Schedule impending timer task.
+     * @param task impending timer chain task
+     * @return timer chain task
+     */
+    private TimerChainTask scheduleImpending(TimerChainTask task) {
+        taskQueue.offer(task);
+        Timer timer = new Timer();
+        this.setImpendingTask(task);
+        this.setImpendingTimer(timer);
+        timer.schedule(task, task.date());
+        return task;
+    }
+
+    /**
+     * Gets impending timer.
+     * @return impending timer
+     */
+    public Timer implendingTimer() {
+        return impendingTimer;
+    }
+
+    /**
+     * Sets impending timer.
+     * @param impendingTimer impending timer
+     */
+    public void setImpendingTimer(Timer impendingTimer) {
+        this.impendingTimer = impendingTimer;
+    }
+
+    /**
+     * Gets impending timer task.
+     * @return impending timer task
+     */
+    public TimerTask impendingTask() {
+        return impendingTask;
+    }
+
+    /**
+     * Sets impending timer task.
+     * @param impendingTask impending timer task
+     */
+    public void setImpendingTask(TimerChainTask impendingTask) {
+        this.impendingTask = impendingTask;
+    }
+
+    /**
+     * Gets head of timer chain task queue.
+     * @return timer chain task
+     */
+    public TimerChainTask head() {
+        if (taskQueue.size() > 0) {
+            return taskQueue.peek();
+        } else {
+            return null;
+        }
+    }
+
+    /**
+     * Pops head of timer chain task queue.
+     * @return timer chain task
+     */
+    public TimerChainTask pop() {
+        if (taskQueue.size() > 0) {
+            return taskQueue.poll();
+        } else {
+            return null;
+        }
+    }
+
+    /**
+     * Class for timer chain task.
+     */
+    public static class TimerChainTask extends TimerTask implements Comparable<TimerChainTask> {
+
+        private final TimerChain timerchain;
+        private final Date date;
+        private final Runnable runnable;
+
+        /**
+         * Constructor of timer chain task.
+         * @param timerchain timer chain
+         * @param date date to be scheduled
+         * @param runnable runnable to be executed by timer
+         */
+        public TimerChainTask(TimerChain timerchain, Date date, Runnable runnable) {
+            this.timerchain = timerchain;
+            this.date = date;
+            this.runnable = runnable;
+        }
+
+        /**
+         * Gets date.
+         * @return date of timer chain task
+         */
+        public Date date() {
+            return this.date;
+        }
+
+        /**
+         * Gets runnable.
+         * @return runnable of timer chain task
+         */
+        public Runnable runnable() {
+            return this.runnable;
+        }
+
+        @Override
+        public void run() {
+
+            TimerChainTask nextTask;
+            synchronized (timerchain) {
+                if (timerchain.impendingTask() != this) {
+                    System.out.println("Invalid impendingTask");
+                    runnable().run();
+                    return;
+                }
+
+                timerchain.implendingTimer().cancel();
+                timerchain.pop();
+
+                nextTask = timerchain.head();
+
+                if (nextTask != null) {
+                    Timer nextTimer = new Timer();
+                    this.timerchain.setImpendingTask(nextTask);
+                    this.timerchain.setImpendingTimer(nextTimer);
+                    nextTimer.schedule(nextTask, nextTask.date());
+                }
+            }
+
+            runnable().run();
+
+        }
+
+        @Override
+        public int compareTo(TimerChainTask target) {
+            return date().compareTo(target.date());
+        }
+
+        /**
+         * Copies timer chain task.
+         * @return timer chain task
+         */
+        public TimerChainTask copy() {
+            return new TimerChainTask(timerchain, date, runnable);
+        }
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkExecutor.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkExecutor.java
new file mode 100644
index 0000000..e834e81
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkExecutor.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+/**
+ * Functional interface for delivering method reference of worklet completion event generator.
+ */
+@FunctionalInterface
+public interface WorkExecutor {
+
+    /**
+     * Applies this method reference.
+     * @throws WorkflowException workflow exception
+     */
+    void apply() throws WorkflowException;
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workflow.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workflow.java
new file mode 100644
index 0000000..95e6e08
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workflow.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import java.net.URI;
+import java.util.Set;
+
+/**
+ * An interface representing workflow.
+ */
+public interface Workflow {
+
+    /**
+     * Id of workflow.
+     * @return id
+     */
+    URI id();
+
+    /**
+     * Returns init worklet.
+     * @param context workflow context
+     * @return init worklet
+     * @throws WorkflowException workflow exception
+     */
+    Worklet init(WorkflowContext context) throws WorkflowException;
+
+    /**
+     * Returns next worklet.
+     * @param context workflow context
+     * @return next worklet
+     * @throws WorkflowException workflow exception
+     */
+    Worklet next(WorkflowContext context) throws WorkflowException;
+
+    /**
+     * Returns instance of worklet.
+     * @param workletType class name of worklet
+     * @return instance of worklet
+     * @throws WorkflowException workflow exception
+     */
+    Worklet getWorkletInstance(String workletType) throws WorkflowException;
+
+    /**
+     * Builds workflow context.
+     * @param workplace workplace of system workflow
+     * @param data data model of system workflow context
+     * @return workflow context
+     * @throws WorkflowException workflow exception
+     */
+    WorkflowContext buildContext(Workplace workplace, DataModelTree data) throws WorkflowException;
+
+    /**
+     * Builds system workflow context.
+     * @param workplace workplace of system workflow
+     * @param data data model of system workflow context
+     * @return system workflow context
+     * @throws WorkflowException workflow exception
+     */
+    WorkflowContext buildSystemContext(Workplace workplace, DataModelTree data) throws WorkflowException;
+
+    /**
+     * Returns workflow attributes.
+     * @return attributes
+     */
+    Set<WorkflowAttribute> attributes();
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowAttribute.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowAttribute.java
new file mode 100644
index 0000000..18ed701
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowAttribute.java
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+/**
+ * Attributes of workflow.
+ */
+public enum WorkflowAttribute {
+
+    /**
+     * Removes workflow context after completion of workflow.
+     */
+    REMOVE_AFTER_COMPLETE,
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowBatchDelegate.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowBatchDelegate.java
new file mode 100644
index 0000000..d54a92a
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowBatchDelegate.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.google.common.annotations.Beta;
+
+import java.util.Collection;
+
+/**
+ * Facade for receiving notifications from the workflow batch service.
+ */
+@Beta
+public interface WorkflowBatchDelegate {
+
+    /**
+     * Submits the specified batch of workflow operations for processing.
+     *
+     * @param operations batch of operations
+     */
+    void execute(Collection<WorkflowData> operations);
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowContext.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowContext.java
new file mode 100644
index 0000000..12d4673
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowContext.java
@@ -0,0 +1,166 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import org.onosproject.event.Event;
+
+import java.net.URI;
+
+/**
+ * An abstract class representing WorkflowContext.
+ */
+public abstract class WorkflowContext extends WorkflowData {
+
+    /**
+     * Constructor of workflow context.
+     * @param data data model tree
+     */
+    public WorkflowContext(DataModelTree data) {
+        super(data);
+    }
+
+    /**
+     * Returns workflow id of this workflow context.
+     * @return workflow id
+     */
+    public abstract URI workflowId();
+
+    /**
+     * Returns workplace name.
+     * @return workplace name
+     */
+    public abstract String workplaceName();
+
+    /**
+     * Returns the current state of workflow context.
+     * @return current state of workflow context
+     */
+    public abstract WorkflowState state();
+
+    /**
+     * Sets the current state of workflow context.
+     * @param state current state of workflow context
+     */
+    public abstract void setState(WorkflowState state);
+
+    /**
+     * Sets the current worklet of workflow context.
+     * @param worklet current worklet
+     */
+    public abstract void setCurrent(Worklet worklet);
+
+    /**
+     * Returns the class name of current worklet.
+     * @return the class name of current worklet
+     */
+    public abstract String current();
+
+    /**
+     * Returns the cause string of exception state.
+     * @return cause string
+     */
+    public abstract String cause();
+
+    /**
+     * Sets the cause string of exception state.
+     * @param cause cause string
+     */
+    public abstract void setCause(String cause);
+
+    /**
+     * Indicates the worklet process become completed.
+     * By calling this, workflow triggers the next worklet selection
+     */
+    public abstract void completed();
+
+    /**
+     * Waits an event which have 'eventHint' after executing executor.
+     * If the event happens, Worklet.isCompleted will be called.
+     * If the event does not happen for timeoutMs, Worklet.timeout will be called.
+     * @param eventType the class of event to wait
+     * @param eventHint the event of the event to wait
+     * @param eventGenerator a method reference to be executed after executing executor
+     * @param timeoutMs timeout millisecond
+     */
+    public abstract void waitCompletion(Class<? extends Event> eventType, String eventHint,
+                                        WorkExecutor eventGenerator, long timeoutMs);
+
+    /**
+     * Waits timeout milliseconds. After timeoutMs Worklet.timeout will be called.
+     * @param timeoutMs timeout millisecond
+     */
+    public abstract void waitFor(long timeoutMs);
+
+    /**
+     * Returns the class of a completion event to wait.
+     * @return the class of a completion event
+     */
+    public abstract Class<? extends Event> completionEventType();
+
+    /**
+     * Returns the event hint string to wait.
+     * @return the event hint string
+     */
+    public abstract String completionEventHint();
+
+    /**
+     * Returns method reference for generating completion event.
+     * @return a method reference
+     */
+    public abstract WorkExecutor completionEventGenerator();
+
+    /**
+     * Returns completion event timeout.
+     * @return completion event timeout
+     */
+    public abstract long completionEventTimeout();
+
+    /**
+     * Sets workflow service.
+     * @param workflowExecutionService workflow service
+     */
+    public abstract void setWorkflowExecutionService(WorkflowExecutionService workflowExecutionService);
+
+    /**
+     * Gets workflow service.
+     * @return workflow service
+     */
+    public abstract WorkflowExecutionService workflowService();
+
+    /**
+     * Sets workflow store.
+     * @param workflowStore workflow store.
+     */
+    public abstract void setWorkflowStore(WorkflowStore workflowStore);
+
+    /**
+     * Gets worklow store.
+     * @return workflow store
+     */
+    public abstract WorkflowStore workflowStore();
+
+    /**
+     * Sets workplace store.
+     * @param workplaceStore work place store.
+     */
+    public abstract void setWorkplaceStore(WorkplaceStore workplaceStore);
+
+    /**
+     * Gets workplace store.
+     * @return workplace store
+     */
+    public abstract WorkplaceStore workplaceStore();
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowData.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowData.java
new file mode 100644
index 0000000..6a8590c
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowData.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+
+/**
+ * An abstract class representing workflow data.
+ */
+public abstract class WorkflowData {
+
+    private DataModelTree data;
+    private boolean triggerNext = true; // default is true
+
+    /**
+     * Constructor of workflow data.
+     * @param data data model tree
+     */
+    public WorkflowData(DataModelTree data) {
+        this.data = data;
+    }
+
+    /**
+     * Returns name.
+     * @return name
+     */
+    public abstract String name();
+
+    /**
+     * Returns work-partition distributor.
+     * @return work-partition distributor
+     */
+    public abstract String distributor();
+
+    /**
+     * Returns context model tree.
+     * @return context model tree
+     */
+    public DataModelTree data() {
+        return data;
+    }
+
+    /**
+     * Returns whether to trigger next worklet selection.
+     * @return whether to trigger next worklet selection
+     */
+    public boolean triggerNext() {
+        return triggerNext;
+    }
+
+    /**
+     * Sets whether to handle update event.
+     * @param triggerNext whether to handle update event
+     */
+    public void setTriggerNext(boolean triggerNext) {
+        this.triggerNext = triggerNext;
+    }
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDataEvent.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDataEvent.java
new file mode 100644
index 0000000..4833251
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDataEvent.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import org.onosproject.event.AbstractEvent;
+
+/**
+ * Workflow data event class.
+ */
+public class WorkflowDataEvent extends AbstractEvent<WorkflowDataEvent.Type, WorkflowData> {
+
+    /**
+     * Workflow data event types.
+     */
+    public enum Type {
+
+        /**
+         * Insertion of workflow data.
+         */
+        INSERT,
+
+        /**
+         * Updation of workflow data.
+         */
+        UPDATE,
+
+        /**
+         * Removal of workflow data.
+         */
+        REMOVE
+    }
+
+    /**
+     * Constructor for workflow data event.
+     * @param type workflow data event type
+     * @param data workflow data
+     */
+    public WorkflowDataEvent(Type type, WorkflowData data) {
+        super(type, data);
+    }
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDataListener.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDataListener.java
new file mode 100644
index 0000000..b777e74
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDataListener.java
@@ -0,0 +1,25 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import org.onosproject.event.EventListener;
+
+/**
+ * Interface for workflow data listener.
+ */
+public interface WorkflowDataListener extends EventListener<WorkflowDataEvent> {
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDescription.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDescription.java
new file mode 100644
index 0000000..ca483f0
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowDescription.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import java.net.URI;
+
+
+/**
+ * interface for workflow description.
+ */
+public interface WorkflowDescription {
+
+    /**
+     * Workflow workplace field name.
+     */
+    String WF_WORKPLACE = "workplace";
+
+    /**
+     * Workflow ID field name.
+     */
+    String WF_ID = "id";
+
+    /**
+     * Workflow data field name.
+     */
+    String WF_DATA = "data";
+
+    /**
+     * Gets workplace name.
+     * @return workplace name
+     */
+    String workplaceName();
+
+    /**
+     * Gets workflow ID.
+     * @return workflow ID
+     */
+    URI id();
+
+    /**
+     * Gets workflow context name.
+     * @return workflow context name
+     */
+    String workflowContextName();
+
+    /**
+     * Gets workflow data model.
+     * @return workflow data model
+     */
+    JsonNode data();
+
+    /**
+     * Gets json of workflow description.
+     * @return json of workflow description
+     */
+    JsonNode toJson();
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowException.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowException.java
new file mode 100644
index 0000000..09506bd
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowException.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+/**
+ * Workflow exception class.
+ */
+public class WorkflowException extends Exception {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Constructor for workflow exception.
+     * @param msg exception message
+     */
+    public WorkflowException(String msg) {
+        super(msg);
+    }
+
+    /**
+     * Constructor for workflow exception.
+     * @param e throwable to deliver
+     */
+    public WorkflowException(Throwable e) {
+        super(e);
+    }
+
+    /**
+     * Constructor for workflow exception.
+     * @param msg exception message
+     * @param e throwable to deliver
+     */
+    public WorkflowException(String msg, Throwable e) {
+        super(msg, e);
+    }
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowExecutionService.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowExecutionService.java
new file mode 100644
index 0000000..ad9f731
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowExecutionService.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import org.onosproject.event.Event;
+import org.onosproject.event.ListenerService;
+
+/**
+ * Interface for workflow execution service.
+ */
+public interface WorkflowExecutionService extends ListenerService<WorkflowDataEvent, WorkflowDataListener> {
+
+    /**
+     * Executes init worklet.
+     * @param context workflow context
+     */
+    void execInitWorklet(WorkflowContext context);
+
+    /**
+     * Triggers workflow event map.
+     * @param event triggering event
+     * @param generator event hint generation method reference
+     */
+    void eventMapTrigger(Event event, EventHintSupplier generator);
+
+    /**
+     * Registers workflow event map.
+     * @param eventType event type (class name of event)
+     * @param eventHint event hint value
+     * @param contextName workflow context name to be called by this event map
+     * @param workletType worklet type to be called by this event map
+     * @throws WorkflowException workflow exception
+     */
+    void registerEventMap(Class<? extends Event> eventType, String eventHint,
+                          String contextName, String workletType) throws WorkflowException;
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowService.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowService.java
new file mode 100644
index 0000000..b11e835
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowService.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * Interface for workflow service.
+ */
+public interface WorkflowService {
+
+    /**
+     * Creates workplace.
+     * @param wpDesc workplace description
+     * @throws WorkflowException workflow exception
+     */
+    void createWorkplace(WorkplaceDescription wpDesc) throws WorkflowException;
+
+    /**
+     * Removes workplace.
+     * @param wpDesc workplace description
+     * @throws WorkflowException workflow exception
+     */
+    void removeWorkplace(WorkplaceDescription wpDesc) throws WorkflowException;
+
+    /**
+     * Clears all workplaces.
+     * @throws WorkflowException workflow exception
+     */
+    void clearWorkplace() throws WorkflowException;
+
+    /**
+     * Invokes workflow.
+     * @param wfDesc workflow description
+     * @throws WorkflowException workflow exception
+     */
+    void invokeWorkflow(WorkflowDescription wfDesc) throws WorkflowException;
+
+    /**
+     * Invokes workflow.
+     * @param worklowDescJson workflow description json
+     * @throws WorkflowException workflow exception
+     */
+    void invokeWorkflow(JsonNode worklowDescJson) throws WorkflowException;
+
+    /**
+     * Terminates workflow.
+     * @param wfDesc workflow description
+     * @throws WorkflowException workflow exception
+     */
+    void terminateWorkflow(WorkflowDescription wfDesc) throws WorkflowException;
+}
\ No newline at end of file
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowState.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowState.java
new file mode 100644
index 0000000..0f92624
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowState.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+/**
+ * State of workflow.
+ */
+public enum WorkflowState {
+
+    /**
+     * Workflow is idle state.
+     */
+    IDLE,
+
+    /**
+     * Workflow is running state.
+     */
+    RUNNING,
+
+    /**
+     * Workflow is exception state.
+     */
+    EXCEPTION
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowStore.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowStore.java
new file mode 100644
index 0000000..ac0de4d
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkflowStore.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import java.net.URI;
+import java.util.Collection;
+
+/**
+ * Store for managing workflow.
+ */
+public interface WorkflowStore {
+
+    /**
+     * Registers workflow.
+     * @param workflow registering workflow
+     */
+    void register(Workflow workflow);
+
+    /**
+     * Unregisters workflow.
+     * @param id id of workflow
+     */
+    void unregister(URI id);
+
+    /**
+     * Gets workflow.
+     * @param id id of workflow
+     * @return workflow
+     */
+    Workflow get(URI id);
+
+    /**
+     * Gets all workflow.
+     * @return collection of workflow
+     */
+    Collection<Workflow> getAll();
+
+    /**
+     * Registers local class loader.
+     * @param loader class loader
+     */
+    void registerLocal(ClassLoader loader);
+
+    /**
+     * Unregisters local class loader.
+     * @param loader class loader
+     */
+    void unregisterLocal(ClassLoader loader);
+
+    /**
+     * Gets class from registered class loaders.
+     * @param name name of class
+     * @return class
+     * @throws ClassNotFoundException class not found exception
+     */
+    Class getClass(String name) throws ClassNotFoundException;
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Worklet.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Worklet.java
new file mode 100644
index 0000000..386fa38
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Worklet.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+
+import org.onosproject.event.Event;
+
+/**
+ * An interface representing worklet. A workflow is composed of worklets.
+ */
+public interface Worklet {
+
+    int MAX_WORKS = 1000;
+
+    /**
+     * Returns tag name of worklet. class name is usually used.
+     * @return tag name
+     */
+    String tag();
+
+    /**
+     * Processes tasks of the worklet under the workflow context.
+     * @param context workflow context
+     * @throws WorkflowException workflow exception
+     */
+    void process(WorkflowContext context) throws WorkflowException;
+
+    /**
+     * Checks whether is this worklet next worklet to be done under the workflow context.
+     * @param context workflow context
+     * @return true means this worklet is the next worklet to be processed
+     * @throws WorkflowException workflow exception
+     */
+    boolean isNext(WorkflowContext context) throws WorkflowException;
+
+    /**
+     * Checks whether is this worklet completed or not. 'isCompleted' checking is triggered by an event task.
+     * @param context workflow context
+     * @param event an event triggering this 'isCompleted' checking
+     * @return completed or not
+     * @throws WorkflowException workflow exception
+     */
+    boolean isCompleted(WorkflowContext context, Event event) throws WorkflowException;
+
+    /**
+     * Completion event timeout handler.
+     * @param context workflow context
+     * @throws WorkflowException workflow exception
+     */
+    void timeout(WorkflowContext context) throws WorkflowException;
+
+    /**
+     * Common worklet enum.
+     */
+    enum Common implements Worklet {
+
+        /**
+         * Init worklet.
+         */
+        INIT {
+            @Override
+            public String tag() {
+                return INIT.name();
+            }
+
+            @Override
+            public void process(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").process should not be called");
+            }
+
+            @Override
+            public boolean isNext(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").isNext should not be called");
+            }
+
+            @Override
+            public boolean isCompleted(WorkflowContext context, Event event)throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").isCompleted should not be called");
+            }
+
+            @Override
+            public void timeout(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").timeout should not be called");
+            }
+        },
+
+        /**
+         * Completed worklet.
+         */
+        COMPLETED {
+            @Override
+            public String tag() {
+                return COMPLETED.name();
+            }
+
+            @Override
+            public void process(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").process should not be called");
+            }
+
+            @Override
+            public boolean isNext(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").isNext should not be called");
+            }
+
+            @Override
+            public boolean isCompleted(WorkflowContext context, Event event)throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").isCompleted should not be called");
+            }
+
+            @Override
+            public void timeout(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").timeout should not be called");
+            }
+        },
+
+        /**
+         * Interrupted worklet.
+         */
+        INTERRUPTED {
+            @Override
+            public String tag() {
+                return INTERRUPTED.name();
+            }
+
+            @Override
+            public void process(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").process should not be called");
+            }
+
+            @Override
+            public boolean isNext(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").isNext should not be called");
+            }
+
+            @Override
+            public boolean isCompleted(WorkflowContext context, Event event)throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").isCompleted should not be called");
+            }
+
+            @Override
+            public void timeout(WorkflowContext context) throws WorkflowException {
+                throw new WorkflowException("(" + tag() + ").timeout should not be called");
+            }
+        }
+    }
+}
+
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workplace.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workplace.java
new file mode 100644
index 0000000..a7439d6
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workplace.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import java.util.Collection;
+
+/**
+ * Abstract class for workplace. A common workflow data container for multiple work-flows.
+ */
+public abstract class Workplace extends WorkflowData {
+
+    public static final String SYSTEM_WORKPLACE = "system-workplace";
+
+    /**
+     * Constructor of workplace.
+     * @param data data model tree
+     */
+    public Workplace(DataModelTree data) {
+        super(data);
+    }
+
+    /**
+     * Gets workflow contexts of workplace.
+     * @return collection of workflow context
+     * @throws WorkflowException workflow exception
+     */
+    abstract Collection<WorkflowContext> getContexts() throws WorkflowException;
+
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceDescription.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceDescription.java
new file mode 100644
index 0000000..16515eb
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceDescription.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import java.util.Optional;
+
+/**
+ * Interface for workplace description.
+ */
+public interface WorkplaceDescription {
+
+    /**
+     * Workplace name field name.
+     */
+    String WP_NAME = "name";
+
+    /**
+     * Workplace data field name.
+     */
+    String WP_DATA = "data";
+
+    /**
+     * Gets workplace name.
+     * @return workplace name
+     */
+    String name();
+
+    /**
+     * Gets optional workplace data model.
+     * @return workplace optData model
+     */
+    Optional<JsonNode> data();
+
+    /**
+     * Gets json of workflow description.
+     * @return json of workflow description
+     */
+    JsonNode toJson();
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceStore.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceStore.java
new file mode 100644
index 0000000..b73cd4f
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceStore.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import org.onosproject.store.Store;
+import org.onosproject.store.service.StorageException;
+
+import java.util.Collection;
+
+/**
+ * Interface for workplace store.
+ */
+public interface WorkplaceStore extends Store<WorkflowDataEvent, WorkplaceStoreDelegate> {
+
+    /**
+     * Registers workplace on workplace store.
+     * @param name workplace name to register
+     * @param workplace workplace
+     * @throws StorageException storage exception
+     */
+    void registerWorkplace(String name, Workplace workplace) throws StorageException;
+
+    /**
+     * Removes workplace from workplace store.
+     * @param name workplace name to remove
+     * @throws StorageException storage exception
+     */
+    void removeWorkplace(String name) throws StorageException;
+
+    /**
+     * Gets workplace on workplace store.
+     * @param name workplace name to get
+     * @return workplace
+     * @throws StorageException storage exception
+     */
+    Workplace getWorkplace(String name) throws StorageException;
+
+    /**
+     * Commits workplace on workplace store.
+     * @param name workplace name to commit
+     * @param workplace workplace to commit
+     * @param handleEvent whether or not to handle workplace(workflow data) event
+     * @throws StorageException storage exception
+     */
+    void commitWorkplace(String name, Workplace workplace, boolean handleEvent) throws StorageException;
+
+    /**
+     * Gets all workplaces from workplace store.
+     * @return collection of workplace
+     * @throws StorageException storage exception
+     */
+    Collection<Workplace> getWorkplaces() throws StorageException;
+
+    /**
+     * Registers workflow context on workplace store.
+     * @param name workflow context name to register
+     * @param context workflow context to register
+     * @throws StorageException storage exception
+     */
+    void registerContext(String name, WorkflowContext context) throws StorageException;
+
+    /**
+     * Removes workflow context from workplace store.
+     * @param name workflow context name
+     * @throws StorageException storage exception
+     */
+    void removeContext(String name) throws StorageException;
+
+    /**
+     * Gets workflow context with name.
+     * @param name workflow context name to get
+     * @return workflow context
+     * @throws StorageException storage exception
+     */
+    WorkflowContext getContext(String name) throws StorageException;
+
+    /**
+     * Commits workflow context on workplace store.
+     * @param name workflow context name to commit
+     * @param context workflow context to commit
+     * @param handleEvent whether or not to handle workflow context(workflow data) event
+     * @throws StorageException storage exception
+     */
+    void commitContext(String name, WorkflowContext context, boolean handleEvent) throws StorageException;
+
+    /**
+     * Gets all workflow context from workplace store.
+     * @return collection of workflow context
+     * @throws StorageException storage exception
+     */
+    Collection<WorkflowContext> getContexts() throws StorageException;
+
+    /**
+     * Gets workflow contexts belonging to a workplace.
+     * @param workplaceName workplace name
+     * @return collection of workflow contexts belonging to a workplace
+     */
+    Collection<WorkflowContext> getWorkplaceContexts(String workplaceName);
+
+    /**
+     * Removes all workflow contexts beloinging to a workplace.
+     * @param workplaceName workplace name
+     */
+    void removeWorkplaceContexts(String workplaceName);
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceStoreDelegate.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceStoreDelegate.java
new file mode 100644
index 0000000..9e7ba14
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/WorkplaceStoreDelegate.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.api;
+
+import org.onosproject.store.StoreDelegate;
+
+/**
+ * Workplace store delegate.
+ */
+public interface WorkplaceStoreDelegate extends StoreDelegate<WorkflowDataEvent> {
+}
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/package-info.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/package-info.java
new file mode 100644
index 0000000..7e68f8f
--- /dev/null
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Package for workflow APIs.
+ */
+package org.onosproject.workflow.api;
\ No newline at end of file
diff --git a/apps/workflow/app/BUCK b/apps/workflow/app/BUCK
new file mode 100644
index 0000000..aa0e62a
--- /dev/null
+++ b/apps/workflow/app/BUCK
@@ -0,0 +1,16 @@
+COMPILE_DEPS = [
+    '//lib:CORE_DEPS',
+    '//lib:KRYO',
+    '//lib:jsch',
+    '//lib:org.apache.karaf.shell.console',
+    '//lib:jackson-core',
+    '//lib:jackson-annotations',
+    '//lib:jackson-databind',
+    '//cli:onos-cli',
+    '//core/store/serializers:onos-core-serializers',
+    '//apps/workflow/api:onos-apps-workflow-api',
+]
+
+osgi_jar_with_tests(
+    deps = COMPILE_DEPS,
+)
diff --git a/apps/workflow/app/BUILD b/apps/workflow/app/BUILD
new file mode 100644
index 0000000..97ef1b4
--- /dev/null
+++ b/apps/workflow/app/BUILD
@@ -0,0 +1,8 @@
+COMPILE_DEPS = CORE_DEPS + KRYO + JACKSON + CLI + [
+    "//core/store/serializers:onos-core-serializers",
+    "//apps/workflow/api:onos-apps-workflow-api",
+]
+
+osgi_jar_with_tests(
+    deps = COMPILE_DEPS,
+)
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowCommand.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowCommand.java
new file mode 100644
index 0000000..94b099b
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowCommand.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.cli;
+
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.workflow.api.DefaultWorkflowDescription;
+import org.onosproject.workflow.api.WorkflowService;
+import org.onosproject.workflow.api.WorkflowException;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+@Command(scope = "onos", name = "workflow", description = "workflow cli")
+public class WorkFlowCommand extends AbstractShellCommand {
+
+    @Argument (index = 0, name = "cmd", description = "command(invoke)", required = true)
+    private String cmd = null;
+
+    @Argument (index = 1, name = "id", description = "workflow id(URI)", required = true)
+    private String id = null;
+
+    @Argument (index = 2, name = "name", description = "workplace name", required = true)
+    private String name = null;
+
+    @Override
+    protected void execute() {
+        if (Objects.isNull(cmd)) {
+            error("invalid cmd parameter");
+            return;
+        }
+
+        switch (cmd) {
+            case "invoke":
+                if (Objects.isNull(id)) {
+                    error("invalid workflow id parameter");
+                    return;
+                }
+
+                if (Objects.isNull(name)) {
+                    error("invalid workplace name parameter");
+                    return;
+                }
+
+                invoke(id, name);
+                break;
+            default:
+                print("Unsupported cmd: " + cmd);
+        }
+    }
+
+    /**
+     * Invokes workflow.
+     * @param workflowId workflow id
+     * @param workplaceName workplace name
+     */
+    private void invoke(String workflowId, String workplaceName) {
+
+        WorkflowService service = get(WorkflowService.class);
+        DefaultWorkflowDescription wfDesc = DefaultWorkflowDescription.builder()
+                .workplaceName(workplaceName)
+                .id(workflowId)
+                .data(JsonNodeFactory.instance.objectNode())
+                .build();
+        try {
+            service.invokeWorkflow(wfDesc);
+        } catch (WorkflowException e) {
+            error(e.getMessage() + ", trace: " + Arrays.asList(e.getStackTrace()));
+        }
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowEventMapCommand.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowEventMapCommand.java
new file mode 100644
index 0000000..0a8e492
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowEventMapCommand.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.cli;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.workflow.api.ContextEventMapStore;
+import org.onosproject.workflow.api.WorkflowException;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+@Command(scope = "onos", name = "workflow-eventmap", description = "workflow event map cli")
+public class WorkFlowEventMapCommand extends AbstractShellCommand {
+
+    @Argument (index = 0, name = "cmd", description = "command(print)", required = true)
+    private String cmd = null;
+
+    @Override
+    protected void execute() {
+        if (Objects.isNull(cmd)) {
+            error("invalid cmd parameter");
+            return;
+        }
+
+        ContextEventMapStore store = get(ContextEventMapStore.class);
+        try {
+            switch (cmd) {
+                case "print":
+                    JsonNode tree = store.asJsonTree();
+                    ObjectMapper mapper = new ObjectMapper();
+                    try {
+                        print(mapper.writerWithDefaultPrettyPrinter().writeValueAsString(tree));
+                    } catch (JsonProcessingException e) {
+                        error(e.getMessage() + ", trace: " + Arrays.asList(e.getStackTrace()));
+                    }
+                    break;
+
+                default:
+                    print("Unsupported cmd: " + cmd);
+            }
+        } catch (WorkflowException e) {
+            error(e.getMessage() + ", trace: " + Arrays.asList(e.getStackTrace()));
+        }
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowStoreCommand.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowStoreCommand.java
new file mode 100644
index 0000000..820d141
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowStoreCommand.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.cli;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.workflow.api.Workflow;
+import org.onosproject.workflow.api.WorkflowStore;
+
+import java.util.Objects;
+import java.net.URI;
+
+@Command(scope = "onos", name = "workflowstore", description = "workflow store cli")
+public class WorkFlowStoreCommand extends AbstractShellCommand {
+
+    @Argument (index = 0, name = "cmd", description = "command(rm)", required = false)
+    private String cmd = null;
+
+    @Argument (index = 1, name = "id", description = "workflow id(URI)", required = false)
+    private String id = null;
+
+    @Override
+    protected void execute() {
+
+        if (Objects.isNull(cmd)) {
+            printAllWorkflow();
+            return;
+        }
+
+        if (Objects.isNull(id)) {
+            print("invalid id");
+            return;
+        }
+
+        switch (cmd) {
+            case "rm":
+                rmWorkflow(id);
+                break;
+            default:
+                print("Unsupported cmd: " + cmd);
+        }
+    }
+
+    private void rmWorkflow(String id) {
+        WorkflowStore workflowStore = get(WorkflowStore.class);
+        workflowStore.unregister(URI.create(id));
+    }
+
+    private void printAllWorkflow() {
+        WorkflowStore workflowStore = get(WorkflowStore.class);
+        for (Workflow workflow : workflowStore.getAll()) {
+            print(getWorkflowString(workflow));
+        }
+    }
+
+    private String getWorkflowString(Workflow workflow) {
+        return workflow.toString();
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowTestCommand.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowTestCommand.java
new file mode 100644
index 0000000..090dad0
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkFlowTestCommand.java
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.cli;
+
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.workflow.api.DefaultWorkflowDescription;
+import org.onosproject.workflow.api.WorkflowException;
+import org.onosproject.workflow.api.WorkflowService;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+@Command(scope = "onos", name = "workflow-test", description = "workflow test cli")
+public class WorkFlowTestCommand extends AbstractShellCommand {
+
+    @Argument (index = 0, name = "cmd", description = "command(invoke)", required = true)
+    private String cmd = null;
+
+    @Argument (index = 1, name = "number", description = "number of test", required = true)
+    private String number = null;
+
+    @Override
+    protected void execute() {
+        if (Objects.isNull(cmd)) {
+            error("invalid cmd parameter");
+            return;
+        }
+
+        switch (cmd) {
+            case "invoke":
+                if (Objects.isNull(number)) {
+                    error("invalid number of test");
+                    return;
+                }
+
+                int num;
+                try {
+                    num = Integer.parseInt(number);
+                } catch (Exception e) {
+                    error(e.getMessage() + ", trace: " + Arrays.asList(e.getStackTrace()));
+                    return;
+                }
+
+                test(num);
+                break;
+            default:
+                print("Unsupported cmd: " + cmd);
+        }
+    }
+
+    /**
+     * Invokes workflow.
+     * @param workflowId workflow id
+     * @param workplaceName workplace name
+     */
+    private void invoke(String workflowId, String workplaceName) {
+
+        WorkflowService service = get(WorkflowService.class);
+        DefaultWorkflowDescription wfDesc = DefaultWorkflowDescription.builder()
+                .workplaceName(workplaceName)
+                .id(workflowId)
+                .data(JsonNodeFactory.instance.objectNode())
+                .build();
+        try {
+            service.invokeWorkflow(wfDesc);
+        } catch (WorkflowException e) {
+            error(e.getMessage() + "trace: " + Arrays.asList(e.getStackTrace()));
+        }
+    }
+
+    /**
+     * Workflow invoke test.
+     * @param num the number of workflow to test
+     */
+    private void test(int num) {
+        for (int i = 0; i <= num; i++) {
+            String wpName = "test-" + i;
+            invoke("sample.workflow-0", wpName);
+        }
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkplaceStoreCommand.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkplaceStoreCommand.java
new file mode 100644
index 0000000..ded5882
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/WorkplaceStoreCommand.java
@@ -0,0 +1,195 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.cli;
+
+import org.apache.karaf.shell.commands.Argument;
+import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.commands.Option;
+import org.onosproject.cli.AbstractShellCommand;
+import org.onosproject.workflow.api.WorkflowContext;
+import org.onosproject.workflow.api.WorkflowException;
+import org.onosproject.workflow.api.WorkflowService;
+import org.onosproject.workflow.api.Workplace;
+import org.onosproject.workflow.api.DefaultWorkplaceDescription;
+import org.onosproject.workflow.api.WorkplaceStore;
+
+import java.util.Arrays;
+import java.util.Objects;
+
+@Command(scope = "onos", name = "workplace",
+        description = "workplace cli")
+public class WorkplaceStoreCommand extends AbstractShellCommand {
+
+    @Argument (index = 0, name = "cmd", description = "command(add/rm/clear/print)", required = false)
+    private String cmd = null;
+
+    @Argument (index = 1, name = "name", description = "workspace name", required = false)
+    private String name = null;
+
+    @Option(name = "-f", aliases = "--filter", description = "including filter",
+            required = false, multiValued = false)
+    private String inFilter = null;
+
+    @Option(name = "-e", aliases = "--excludefilter", description = "excluding filter",
+            required = false, multiValued = false)
+    private String exFilter = null;
+
+    @Override
+    protected void execute() {
+
+        if (Objects.isNull(cmd)) {
+            printAllWorkplace();
+            return;
+        }
+
+        switch (cmd) {
+            case "add":
+                if (Objects.isNull(name)) {
+                    error("invalid name");
+                    return;
+                }
+                addEmptyWorkplace(name);
+                return;
+
+            case "rm":
+                if (Objects.isNull(name)) {
+                    print("invalid name");
+                    return;
+                }
+                rmWorkplace(name);
+                break;
+
+            case "clear":
+                clearWorkplace();
+                break;
+
+            case "print":
+                if (Objects.isNull(name)) {
+                    print("invalid name");
+                    return;
+                }
+                printWorkplace(name);
+                break;
+
+            default:
+                print("Unsupported cmd: " + cmd);
+        }
+    }
+
+    /**
+     * Adds empty workplace.
+     * @param name workplace name
+     */
+    private void addEmptyWorkplace(String name) {
+        WorkflowService service = get(WorkflowService.class);
+        DefaultWorkplaceDescription wpDesc = DefaultWorkplaceDescription.builder()
+                .name(name)
+                .build();
+        try {
+            service.createWorkplace(wpDesc);
+        } catch (WorkflowException e) {
+            error(e.getMessage() + ", trace: " + Arrays.asList(e.getStackTrace()));
+        }
+    }
+
+    /**
+     * Clears all workplaces.
+     */
+    private void clearWorkplace() {
+        WorkflowService service = get(WorkflowService.class);
+        try {
+            service.clearWorkplace();
+        } catch (WorkflowException e) {
+            error(e.getMessage() + ", trace: " + Arrays.asList(e.getStackTrace()));
+        }
+    }
+
+    /**
+     * Removes workplace.
+     * @param name workplace name to remove
+     */
+    private void rmWorkplace(String name) {
+        WorkflowService service = get(WorkflowService.class);
+        DefaultWorkplaceDescription wpDesc = DefaultWorkplaceDescription.builder()
+                .name(name)
+                .build();
+        try {
+            service.removeWorkplace(wpDesc);
+        } catch (WorkflowException e) {
+            error(e.getMessage() + ", trace: " + Arrays.asList(e.getStackTrace()));
+        }
+    }
+
+    /**
+     * Prints workplace.
+     * @param name workplace name
+     */
+    private void printWorkplace(String name) {
+        WorkplaceStore workplaceStore = get(WorkplaceStore.class);
+        Workplace workplace = workplaceStore.getWorkplace(name);
+        print(getWorkplaceString(workplace));
+    }
+
+    /**
+     * Prints all workplaces.
+     */
+    private void printAllWorkplace() {
+        WorkplaceStore workplaceStore = get(WorkplaceStore.class);
+        for (Workplace workplace : workplaceStore.getWorkplaces()) {
+            print(getWorkplaceString(workplace));
+            printWorkplaceContexts(workplaceStore, workplace.name());
+        }
+    }
+
+    /**
+     * Prints contexts of workplace.
+     * @param workplaceStore workplace store service
+     * @param workplaceName workplace name
+     */
+    private void printWorkplaceContexts(WorkplaceStore workplaceStore, String workplaceName) {
+        for (WorkflowContext context : workplaceStore.getWorkplaceContexts(workplaceName)) {
+            String str = context.toString();
+            if (Objects.nonNull(inFilter)) {
+                if (str.indexOf(inFilter) != -1) {
+                    if (Objects.nonNull(exFilter)) {
+                        if (str.indexOf(exFilter) == -1) {
+                            print(" - " + context);
+                        }
+                    } else {
+                        print(" - " + context);
+                    }
+                }
+            } else {
+                if (Objects.nonNull(exFilter)) {
+                    if (str.indexOf(exFilter) == -1) {
+                        print(" - " + context);
+                    }
+                } else {
+                    print(" - " + context);
+                }
+            }
+        }
+    }
+
+    /**
+     * Gets workplace string.
+     * @param workplace workplace
+     * @return workplace string
+     */
+    private String getWorkplaceString(Workplace workplace) {
+        return workplace.toString();
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/package-info.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/package-info.java
new file mode 100644
index 0000000..0383d04
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/cli/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Workflow cli package.
+ */
+package org.onosproject.workflow.cli;
\ No newline at end of file
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/DistributedContextEventMapTreeStore.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/DistributedContextEventMapTreeStore.java
new file mode 100644
index 0000000..b7c7366
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/DistributedContextEventMapTreeStore.java
@@ -0,0 +1,198 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.google.common.collect.Lists;
+import com.google.common.collect.Maps;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.AsyncDocumentTree;
+import org.onosproject.store.service.DocumentPath;
+import org.onosproject.store.service.IllegalDocumentModificationException;
+import org.onosproject.store.service.NoSuchDocumentPathException;
+import org.onosproject.store.service.Ordering;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Versioned;
+import org.onosproject.workflow.api.ContextEventMapStore;
+import org.onosproject.workflow.api.WorkflowException;
+import org.slf4j.Logger;
+
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutionException;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+@Component(immediate = true)
+@Service
+public class DistributedContextEventMapTreeStore implements ContextEventMapStore {
+
+    protected static final Logger log = getLogger(DistributedContextEventMapTreeStore.class);
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    private CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    private StorageService storageService;
+
+    private ApplicationId appId;
+
+    private AsyncDocumentTree<String> eventMapTree;
+
+    @Activate
+    public void activate() {
+
+        appId = coreService.registerApplication("org.onosproject.contexteventmapstore");
+        log.info("appId=" + appId);
+
+        KryoNamespace eventMapNamespace = KryoNamespace.newBuilder()
+                .register(KryoNamespaces.API)
+                .build();
+
+        eventMapTree = storageService.<String>documentTreeBuilder()
+                .withSerializer(Serializer.using(eventMapNamespace))
+                .withName("context-event-map-store")
+                .withOrdering(Ordering.INSERTION)
+                .buildDocumentTree();
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        eventMapTree.destroy();
+        log.info("Stopped");
+    }
+
+    @Override
+    public void registerEventMap(String eventType, String eventHint,
+                                 String contextName, String workletType) throws WorkflowException {
+        DocumentPath dpath = DocumentPath.from(Lists.newArrayList("root", eventType, eventHint, contextName));
+        String currentWorkletType = completeVersioned(eventMapTree.get(dpath));
+        if (currentWorkletType == null) {
+            complete(eventMapTree.createRecursive(dpath, workletType));
+        } else {
+            complete(eventMapTree.replace(dpath, workletType, currentWorkletType));
+        }
+    }
+
+    @Override
+    public void unregisterEventMap(String eventType, String eventHint, String contextName) throws WorkflowException {
+        DocumentPath contextPath = DocumentPath.from(Lists.newArrayList("root", eventType, eventHint, contextName));
+        complete(eventMapTree.removeNode(contextPath));
+    }
+
+    @Override
+    public Map<String, String> getEventMap(String eventType, String eventHint) throws WorkflowException {
+        DocumentPath path = DocumentPath.from(Lists.newArrayList("root", eventType, eventHint));
+        Map<String, Versioned<String>> contexts = complete(eventMapTree.getChildren(path));
+        Map<String, String> eventMap = Maps.newHashMap();
+        if (Objects.isNull(contexts)) {
+            return eventMap;
+        }
+
+        for (Map.Entry<String, Versioned<String>> entry : contexts.entrySet()) {
+            eventMap.put(entry.getKey(), entry.getValue().value());
+        }
+        return eventMap;
+    }
+
+    @Override
+    public Map<String, Versioned<String>> getChildren(String path) throws WorkflowException {
+        DocumentPath dpath = DocumentPath.from(path);
+        Map<String, Versioned<String>> entries = complete(eventMapTree.getChildren(dpath));
+        return entries;
+    }
+
+    @Override
+    public DocumentPath getDocumentPath(String path) throws WorkflowException {
+        DocumentPath dpath = DocumentPath.from(path);
+        return dpath;
+    }
+
+    @Override
+    public ObjectNode asJsonTree() throws WorkflowException {
+
+        DocumentPath rootPath = DocumentPath.from(Lists.newArrayList("root"));
+        Map<String, Versioned<String>> eventmap = complete(eventMapTree.getChildren(rootPath));
+
+        ObjectNode rootNode = JsonNodeFactory.instance.objectNode();
+
+        for (Map.Entry<String, Versioned<String>> eventTypeEntry : eventmap.entrySet()) {
+
+            String eventType = eventTypeEntry.getKey();
+
+            ObjectNode eventTypeNode = JsonNodeFactory.instance.objectNode();
+            rootNode.put(eventType, eventTypeNode);
+
+            DocumentPath eventTypePath = DocumentPath.from(Lists.newArrayList("root", eventType));
+            Map<String, Versioned<String>> hintmap = complete(eventMapTree.getChildren(eventTypePath));
+
+            for (Map.Entry<String, Versioned<String>> hintEntry : hintmap.entrySet()) {
+
+                String hint = hintEntry.getKey();
+
+                ObjectNode hintNode = JsonNodeFactory.instance.objectNode();
+                eventTypeNode.put(hint, hintNode);
+
+                DocumentPath hintPath = DocumentPath.from(Lists.newArrayList("root", eventType, hint));
+                Map<String, Versioned<String>> contextmap = complete(eventMapTree.getChildren(hintPath));
+
+                for (Map.Entry<String, Versioned<String>> ctxtEntry : contextmap.entrySet()) {
+                    hintNode.put(ctxtEntry.getKey(), ctxtEntry.getValue().value());
+                }
+            }
+        }
+
+        return rootNode;
+    }
+
+    private <T> T complete(CompletableFuture<T> future) throws WorkflowException {
+        try {
+            return future.get();
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+            throw new WorkflowException(e.getCause().getMessage());
+        } catch (ExecutionException e) {
+            if (e.getCause() instanceof IllegalDocumentModificationException) {
+                throw new WorkflowException("Node or parent does not exist or is root or is not a Leaf Node",
+                        e.getCause());
+            } else if (e.getCause() instanceof NoSuchDocumentPathException) {
+                return null;
+            } else {
+                throw new WorkflowException("Datastore operation failed", e.getCause());
+            }
+        }
+    }
+
+    private <T> T completeVersioned(CompletableFuture<Versioned<T>> future) throws WorkflowException {
+        return Optional.ofNullable(complete(future))
+                .map(Versioned::value)
+                .orElse(null);
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/DistributedWorkplaceStore.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/DistributedWorkplaceStore.java
new file mode 100644
index 0000000..ca8a454
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/DistributedWorkplaceStore.java
@@ -0,0 +1,394 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.BaseJsonNode;
+import com.fasterxml.jackson.databind.node.BigIntegerNode;
+import com.fasterxml.jackson.databind.node.BinaryNode;
+import com.fasterxml.jackson.databind.node.BooleanNode;
+import com.fasterxml.jackson.databind.node.ContainerNode;
+import com.fasterxml.jackson.databind.node.DecimalNode;
+import com.fasterxml.jackson.databind.node.DoubleNode;
+import com.fasterxml.jackson.databind.node.FloatNode;
+import com.fasterxml.jackson.databind.node.IntNode;
+import com.fasterxml.jackson.databind.node.JsonNodeCreator;
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.fasterxml.jackson.databind.node.JsonNodeType;
+import com.fasterxml.jackson.databind.node.LongNode;
+import com.fasterxml.jackson.databind.node.MissingNode;
+import com.fasterxml.jackson.databind.node.NullNode;
+import com.fasterxml.jackson.databind.node.NumericNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import com.fasterxml.jackson.databind.node.POJONode;
+import com.fasterxml.jackson.databind.node.ShortNode;
+import com.fasterxml.jackson.databind.node.TextNode;
+import com.fasterxml.jackson.databind.node.ValueNode;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Maps;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.workflow.api.DataModelTree;
+import org.onosproject.workflow.api.DefaultWorkplace;
+import org.onosproject.workflow.api.DefaultWorkflowContext;
+import org.onosproject.workflow.api.JsonDataModelTree;
+import org.onosproject.workflow.api.SystemWorkflowContext;
+import org.onosproject.workflow.api.WorkflowContext;
+import org.onosproject.workflow.api.WorkflowData;
+import org.onosproject.workflow.api.WorkflowState;
+import org.onosproject.workflow.api.Workplace;
+import org.onosproject.workflow.api.WorkflowDataEvent;
+import org.onosproject.workflow.api.WorkplaceStore;
+import org.onosproject.workflow.api.WorkplaceStoreDelegate;
+import org.onosproject.store.AbstractStore;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.ConsistentMap;
+import org.onosproject.store.service.MapEvent;
+import org.onosproject.store.service.MapEventListener;
+import org.onosproject.store.service.Serializer;
+import org.onosproject.store.service.StorageException;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.Versioned;
+import org.slf4j.Logger;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+@Component(immediate = true)
+@Service
+public class DistributedWorkplaceStore
+    extends AbstractStore<WorkflowDataEvent, WorkplaceStoreDelegate> implements WorkplaceStore {
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected StorageService storageService;
+
+    private ApplicationId appId;
+    private final Logger log = getLogger(getClass());
+
+    private final WorkplaceMapListener workplaceMapEventListener = new WorkplaceMapListener();
+    private ConsistentMap<String, WorkflowData> workplaceMap;
+    private Map<String, Workplace> localWorkplaceMap = Maps.newConcurrentMap();
+
+    private final WorkflowContextMapListener contextMapEventListener = new WorkflowContextMapListener();
+    private ConsistentMap<String, WorkflowData> contextMap;
+    private Map<String, WorkflowContext> localContextMap = Maps.newConcurrentMap();
+
+    private Map<String, Map<String, WorkflowContext>> localWorkplaceMemberMap = Maps.newConcurrentMap();
+
+    @Activate
+    public void activate() {
+
+        appId = coreService.registerApplication("org.onosproject.workplacestore");
+        log.info("appId=" + appId);
+
+        KryoNamespace workplaceNamespace = KryoNamespace.newBuilder()
+                .register(KryoNamespaces.API)
+                .register(WorkflowData.class)
+                .register(Workplace.class)
+                .register(DefaultWorkplace.class)
+                .register(WorkflowContext.class)
+                .register(DefaultWorkflowContext.class)
+                .register(SystemWorkflowContext.class)
+                .register(WorkflowState.class)
+                .register(DataModelTree.class)
+                .register(JsonDataModelTree.class)
+                .register(List.class)
+                .register(ArrayList.class)
+                .register(JsonNode.class)
+                .register(ObjectNode.class)
+                .register(TextNode.class)
+                .register(LinkedHashMap.class)
+                .register(ArrayNode.class)
+                .register(BaseJsonNode.class)
+                .register(BigIntegerNode.class)
+                .register(BinaryNode.class)
+                .register(BooleanNode.class)
+                .register(ContainerNode.class)
+                .register(DecimalNode.class)
+                .register(DoubleNode.class)
+                .register(FloatNode.class)
+                .register(IntNode.class)
+                .register(JsonNodeType.class)
+                .register(LongNode.class)
+                .register(MissingNode.class)
+                .register(NullNode.class)
+                .register(NumericNode.class)
+                .register(POJONode.class)
+                .register(ShortNode.class)
+                .register(ValueNode.class)
+                .register(JsonNodeCreator.class)
+                .register(JsonNodeFactory.class)
+                .build();
+
+        localWorkplaceMap.clear();
+        workplaceMap = storageService.<String, WorkflowData>consistentMapBuilder()
+                .withSerializer(Serializer.using(workplaceNamespace))
+                .withName("workplace-map")
+                .withApplicationId(appId)
+                .build();
+        workplaceMap.addListener(workplaceMapEventListener);
+
+        localContextMap.clear();
+        contextMap = storageService.<String, WorkflowData>consistentMapBuilder()
+                .withSerializer(Serializer.using(workplaceNamespace))
+                .withName("workflow-context-map")
+                .withApplicationId(appId)
+                .build();
+        contextMap.addListener(contextMapEventListener);
+
+        workplaceMapEventListener.syncLocal();
+        contextMapEventListener.syncLocal();
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        workplaceMap.destroy();
+        localWorkplaceMap.clear();
+        contextMap.destroy();
+        localContextMap.clear();
+
+        log.info("Stopped");
+    }
+
+    @Override
+    public void registerWorkplace(String name, Workplace workplace) throws StorageException {
+        workplaceMap.put(name, workplace);
+    }
+
+    @Override
+    public void removeWorkplace(String name) throws StorageException {
+        removeWorkplaceContexts(name);
+        workplaceMap.remove(name);
+    }
+
+    @Override
+    public Workplace getWorkplace(String name) throws StorageException {
+        return localWorkplaceMap.get(name);
+    }
+
+    @Override
+    public Collection<Workplace> getWorkplaces() throws StorageException {
+        return ImmutableList.copyOf(localWorkplaceMap.values());
+    }
+
+    @Override
+    public void commitWorkplace(String name, Workplace workplace, boolean handleEvent) throws StorageException {
+        workplace.setTriggerNext(handleEvent);
+        if (workplaceMap.containsKey(name)) {
+            workplaceMap.replace(name, workplace);
+        } else {
+            registerWorkplace(name, workplace);
+        }
+    }
+
+    @Override
+    public void registerContext(String name, WorkflowContext context) throws StorageException {
+        contextMap.put(name, context);
+    }
+
+    @Override
+    public void removeContext(String name) throws StorageException {
+        contextMap.remove(name);
+    }
+
+    @Override
+    public WorkflowContext getContext(String name) throws StorageException {
+        return localContextMap.get(name);
+    }
+
+    @Override
+    public void commitContext(String name, WorkflowContext context, boolean handleEvent) throws StorageException {
+        context.setTriggerNext(handleEvent);
+        if (contextMap.containsKey(name)) {
+            contextMap.replace(name, context);
+        } else {
+            registerContext(name, context);
+        }
+    }
+
+    @Override
+    public Collection<WorkflowContext> getContexts() throws StorageException {
+        return ImmutableList.copyOf(localContextMap.values());
+    }
+
+    @Override
+    public Collection<WorkflowContext> getWorkplaceContexts(String workplaceName) {
+        Map<String, WorkflowContext> ctxMap = localWorkplaceMemberMap.get(workplaceName);
+        if (ctxMap == null) {
+            return Collections.emptyList();
+        }
+
+        return ImmutableList.copyOf(ctxMap.values());
+    }
+
+    @Override
+    public void removeWorkplaceContexts(String workplaceName) {
+        for (WorkflowContext ctx : getWorkplaceContexts(workplaceName)) {
+            removeContext(ctx.name());
+        }
+    }
+
+    private class WorkplaceMapListener implements MapEventListener<String, WorkflowData> {
+
+        @Override
+        public void event(MapEvent<String, WorkflowData> event) {
+
+            Workplace newWorkplace = (Workplace) Versioned.valueOrNull(event.newValue());
+            Workplace oldWorkplace = (Workplace) Versioned.valueOrNull(event.oldValue());
+
+            log.info("WorkplaceMap event: {}", event);
+            switch (event.type()) {
+                case INSERT:
+                    insert(newWorkplace);
+                    notifyDelegate(new WorkflowDataEvent(WorkflowDataEvent.Type.INSERT, newWorkplace));
+                    break;
+                case UPDATE:
+                    update(newWorkplace);
+                    notifyDelegate(new WorkflowDataEvent(WorkflowDataEvent.Type.UPDATE, newWorkplace));
+                    break;
+                case REMOVE:
+                    remove(oldWorkplace);
+                    notifyDelegate(new WorkflowDataEvent(WorkflowDataEvent.Type.REMOVE, oldWorkplace));
+                    break;
+                default:
+            }
+        }
+
+        private void insert(Workplace workplace) {
+            localWorkplaceMap.put(workplace.name(), workplace);
+        }
+
+        private void update(Workplace workplace) {
+            localWorkplaceMap.replace(workplace.name(), workplace);
+        }
+
+        private void remove(Workplace workplace) {
+            localWorkplaceMap.remove(workplace.name());
+        }
+
+        public void syncLocal() {
+            workplaceMap.values().stream().forEach(
+                    x -> insert((Workplace) (x.value()))
+            );
+        }
+    }
+
+    private class WorkflowContextMapListener implements MapEventListener<String, WorkflowData> {
+
+        @Override
+        public void event(MapEvent<String, WorkflowData> event) {
+
+            WorkflowContext newContext = (WorkflowContext) Versioned.valueOrNull(event.newValue());
+            WorkflowContext oldContext = (WorkflowContext) Versioned.valueOrNull(event.oldValue());
+
+            log.info("WorkflowContext event: {}", event);
+            switch (event.type()) {
+                case INSERT:
+                    insert(newContext);
+                    notifyDelegate(new WorkflowDataEvent(WorkflowDataEvent.Type.INSERT, newContext));
+                    break;
+                case UPDATE:
+                    update(newContext);
+                    notifyDelegate(new WorkflowDataEvent(WorkflowDataEvent.Type.UPDATE, newContext));
+                    break;
+                case REMOVE:
+                    remove(oldContext);
+                    notifyDelegate(new WorkflowDataEvent(WorkflowDataEvent.Type.REMOVE, oldContext));
+                    break;
+                default:
+            }
+        }
+
+        /**
+         * Inserts workflow context on local hash map.
+         * @param context workflow context
+         */
+        private void insert(WorkflowContext context) {
+            String workplaceName = context.workplaceName();
+            Map<String, WorkflowContext> ctxMap = localWorkplaceMemberMap.get(workplaceName);
+            if (ctxMap == null) {
+                ctxMap = new HashMap<>();
+                localWorkplaceMemberMap.put(workplaceName, ctxMap);
+            }
+            ctxMap.put(context.name(), context);
+
+            localContextMap.put(context.name(), context);
+        }
+
+        /**
+         * Updates workflow context on local hash map.
+         * @param context workflow context
+         */
+        private void update(WorkflowContext context) {
+            String workplaceName = context.workplaceName();
+            Map<String, WorkflowContext> ctxMap = localWorkplaceMemberMap.get(workplaceName);
+            if (ctxMap == null) {
+                ctxMap = new HashMap<>();
+                localWorkplaceMemberMap.put(workplaceName, ctxMap);
+            }
+            ctxMap.put(context.name(), context);
+
+            localContextMap.put(context.name(), context);
+        }
+
+        /**
+         * Removes workflow context from local hash map.
+         * @param context workflow context
+         */
+        private void remove(WorkflowContext context) {
+            localContextMap.remove(context.name());
+
+            String workplaceName = context.workplaceName();
+            Map<String, WorkflowContext> ctxMap = localWorkplaceMemberMap.get(workplaceName);
+            if (ctxMap == null) {
+                log.error("remove-context: Failed to find workplace({}) in localWorkplaceMemberMap", workplaceName);
+                return;
+            }
+            ctxMap.remove(context.name());
+            if (ctxMap.size() == 0) {
+                localWorkplaceMemberMap.remove(workplaceName, ctxMap);
+            }
+        }
+
+        /**
+         * Synchronizes local hash map.
+         */
+        public void syncLocal() {
+            contextMap.values().stream().forEach(
+                    x -> insert((WorkflowContext) (x.value()))
+            );
+        }
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/ECWorkFlowStore.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/ECWorkFlowStore.java
new file mode 100644
index 0000000..cd7df77
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/ECWorkFlowStore.java
@@ -0,0 +1,155 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Sets;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onlab.util.KryoNamespace;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.workflow.api.AbstractWorkflow;
+import org.onosproject.workflow.api.ImmutableListWorkflow;
+import org.onosproject.workflow.api.Workflow;
+import org.onosproject.workflow.api.WorkflowAttribute;
+import org.onosproject.workflow.api.WorkflowStore;
+import org.onosproject.net.group.GroupEvent;
+import org.onosproject.net.group.GroupStoreDelegate;
+import org.onosproject.store.AbstractStore;
+import org.onosproject.store.serializers.KryoNamespaces;
+import org.onosproject.store.service.EventuallyConsistentMap;
+import org.onosproject.store.service.StorageService;
+import org.onosproject.store.service.WallClockTimestamp;
+import org.slf4j.Logger;
+
+import java.net.URI;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+import java.util.List;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+@Component(immediate = true)
+@Service
+public class ECWorkFlowStore
+    extends AbstractStore<GroupEvent, GroupStoreDelegate> implements WorkflowStore {
+
+    private final Logger log = getLogger(getClass());
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected StorageService storageService;
+
+    private ApplicationId appId;
+    private EventuallyConsistentMap<URI, Workflow> workflowStore;
+    private Set<ClassLoader> classloaders = Sets.newConcurrentHashSet();
+
+    @Activate
+    public void activate() {
+
+        appId = coreService.registerApplication("org.onosproject.nfconfig");
+        log.info("appId=" + appId);
+
+        KryoNamespace.Builder workflowSerializer = KryoNamespace.newBuilder()
+                .register(KryoNamespaces.API)
+                .register(URI.class)
+                .register(Workflow.class)
+                .register(AbstractWorkflow.class)
+                .register(ImmutableListWorkflow.class)
+                .register(List.class)
+                .register(ImmutableList.class)
+                .register(Class.class)
+                .register(WorkflowAttribute.class)
+                .register(Set.class)
+                .register(ImmutableSet.class)
+                .register(HashSet.class);
+
+        workflowStore = storageService.<URI, Workflow>eventuallyConsistentMapBuilder()
+                .withName("workflow-workplaceStore")
+                .withSerializer(workflowSerializer)
+                .withAntiEntropyPeriod(5, TimeUnit.SECONDS)
+                .withTimestampProvider((k, v) -> new WallClockTimestamp())
+                .withTombstonesDisabled()
+                .build();
+
+        classloaders.add(this.getClass().getClassLoader());
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        workflowStore.destroy();
+
+        log.info("Stopped");
+    }
+
+    @Override
+    public void register(Workflow workflow) {
+        workflowStore.put(workflow.id(), workflow);
+    }
+
+    @Override
+    public void unregister(URI id) {
+        workflowStore.remove(id);
+    }
+
+    @Override
+    public Workflow get(URI id) {
+        return workflowStore.get(id);
+    }
+
+    @Override
+    public Collection<Workflow> getAll() {
+        return workflowStore.values();
+    }
+
+    @Override
+    public void registerLocal(ClassLoader loader) {
+        classloaders.add(loader);
+    }
+
+    @Override
+    public void unregisterLocal(ClassLoader loader) {
+        classloaders.remove(loader);
+    }
+
+    @Override
+    public Class getClass(String name) throws ClassNotFoundException {
+        for (ClassLoader loader : classloaders) {
+            Class cl = null;
+            try {
+                cl = loader.loadClass(name);
+            } catch (ClassNotFoundException e) {
+                // do nothing
+            }
+            if (cl != null) {
+                return cl;
+            }
+        }
+        throw new ClassNotFoundException(name);
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/HandlerTaskAccumulator.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/HandlerTaskAccumulator.java
new file mode 100644
index 0000000..4651cd4
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/HandlerTaskAccumulator.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.ListMultimap;
+import org.onlab.util.AbstractAccumulator;
+import org.onosproject.workflow.api.HandlerTask;
+import org.onosproject.workflow.api.HandlerTaskBatchDelegate;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Timer;
+
+/**
+ * An accumulator for building batches of event task operations. Only one batch should
+ * be in process per instance at a time.
+ */
+public class HandlerTaskAccumulator extends AbstractAccumulator<HandlerTask> {
+
+    private static final int DEFAULT_MAX_EVENTS = 5000;
+    private static final int DEFAULT_MAX_IDLE_MS = 10;
+    private static final int DEFAULT_MAX_BATCH_MS = 50;
+
+    private static final Timer TIMER = new Timer("onos-workflow-handlertask-batching");
+
+    private final HandlerTaskBatchDelegate delegate;
+
+    private volatile boolean ready;
+
+    /**
+     * Creates an event-task operation accumulator.
+     *
+     * @param delegate the event-task batch delegate
+     */
+    protected HandlerTaskAccumulator(HandlerTaskBatchDelegate delegate) {
+        super(TIMER, DEFAULT_MAX_EVENTS, DEFAULT_MAX_BATCH_MS, DEFAULT_MAX_IDLE_MS);
+        this.delegate = delegate;
+        // Assume that the delegate is ready for workletType at the start
+        ready = true; //TODO validate the assumption that delegate is ready
+    }
+
+    @Override
+    public void processItems(List<HandlerTask> items) {
+        ready = false;
+        delegate.execute(epoch(items));
+    }
+
+    /**
+     * Gets epoch.
+     * @param ops handler tasks
+     * @return collection of collection of handler task.
+     */
+    private Collection<Collection<HandlerTask>> epoch(List<HandlerTask> ops) {
+
+        ListMultimap<String, HandlerTask> tasks = ArrayListMultimap.create();
+
+        // align event-tasks with context
+        for (HandlerTask op : ops) {
+            tasks.put(op.context().name(), op);
+        }
+
+        return tasks.asMap().values();
+    }
+
+    @Override
+    public boolean isReady() {
+        return ready;
+    }
+
+    /**
+     * Making accumulator to be ready.
+     */
+    public void ready() {
+        ready = true;
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkFlowEngine.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkFlowEngine.java
new file mode 100644
index 0000000..26e0bc9
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkFlowEngine.java
@@ -0,0 +1,740 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import com.google.common.collect.Lists;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.cluster.ClusterService;
+import org.onosproject.cluster.LeadershipService;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.core.CoreService;
+import org.onosproject.workflow.api.DefaultWorkplace;
+import org.onosproject.workflow.api.EventHintSupplier;
+import org.onosproject.workflow.api.EventTask;
+import org.onosproject.workflow.api.JsonDataModelTree;
+import org.onosproject.workflow.api.SystemWorkflowContext;
+import org.onosproject.workflow.api.EventTimeoutTask;
+import org.onosproject.workflow.api.TimeoutTask;
+import org.onosproject.workflow.api.TimerChain;
+import org.onosproject.workflow.api.Worklet;
+import org.onosproject.workflow.api.Workflow;
+import org.onosproject.workflow.api.WorkflowContext;
+import org.onosproject.workflow.api.WorkflowData;
+import org.onosproject.workflow.api.ContextEventMapStore;
+import org.onosproject.workflow.api.WorkflowState;
+import org.onosproject.workflow.api.WorkflowStore;
+import org.onosproject.workflow.api.WorkflowBatchDelegate;
+import org.onosproject.workflow.api.WorkflowDataEvent;
+import org.onosproject.workflow.api.WorkflowDataListener;
+import org.onosproject.workflow.api.WorkflowException;
+import org.onosproject.workflow.api.HandlerTask;
+import org.onosproject.workflow.api.HandlerTaskBatchDelegate;
+import org.onosproject.workflow.api.Workplace;
+import org.onosproject.workflow.api.WorkplaceStore;
+import org.onosproject.workflow.api.WorkplaceStoreDelegate;
+import org.onosproject.workflow.api.WorkflowExecutionService;
+import org.onosproject.event.AbstractListenerManager;
+import org.onosproject.event.Event;
+import org.onosproject.net.intent.WorkPartitionService;
+import org.slf4j.Logger;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.UUID;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.stream.Collectors;
+
+import static java.util.concurrent.Executors.newFixedThreadPool;
+import static java.util.concurrent.Executors.newSingleThreadExecutor;
+import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor;
+import static org.onlab.util.Tools.groupedThreads;
+import static org.onosproject.workflow.api.WorkflowAttribute.REMOVE_AFTER_COMPLETE;
+import static org.slf4j.LoggerFactory.getLogger;
+
+@Component(immediate = true)
+@Service
+public class WorkFlowEngine extends AbstractListenerManager<WorkflowDataEvent, WorkflowDataListener>
+        implements WorkflowExecutionService {
+
+    protected static final Logger log = getLogger(WorkFlowEngine.class);
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ClusterService clusterService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected LeadershipService leadershipService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkPartitionService partitionService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkplaceStore workplaceStore;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkflowStore workflowStore;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ContextEventMapStore eventMapStore;
+
+    private final WorkplaceStoreDelegate workplaceStoreDelegate = this::post;
+
+    private final WorkflowBatchDelegate workflowBatchDelegate = new InternalWorkflowBatchDelegate();
+    private final WorkflowAccumulator workflowAccumulator = new WorkflowAccumulator(workflowBatchDelegate);
+
+    private final HandlerTaskBatchDelegate eventtaskBatchDelegate = new InternalHandlerTaskBatchDelegate();
+    private final HandlerTaskAccumulator eventtaskAccumulator = new HandlerTaskAccumulator(eventtaskBatchDelegate);
+
+    private ExecutorService workflowBatchExecutor;
+    private ExecutorService workflowExecutor;
+
+    private ExecutorService handlerTaskBatchExecutor;
+    private ExecutorService handlerTaskExecutor;
+
+    private static final int DEFAULT_WORKFLOW_THREADS = 12;
+    private static final int DEFAULT_EVENTTASK_THREADS = 12;
+    private static final int MAX_REGISTER_EVENTMAP_WAITS = 10;
+
+    private ScheduledExecutorService eventMapTriggerExecutor;
+
+    private TimerChain timerChain = new TimerChain();
+
+    public static final String APPID = "org.onosproject.workflow";
+    private ApplicationId appId;
+    private NodeId localNodeId;
+
+    @Activate
+    public void activate() {
+        appId = coreService.registerApplication(APPID);
+        workplaceStore.setDelegate(workplaceStoreDelegate);
+        localNodeId = clusterService.getLocalNode().id();
+        leadershipService.runForLeadership(appId.name());
+
+        workflowBatchExecutor = newSingleThreadExecutor(
+                groupedThreads("onos/workflow", "workflow-batch", log));
+        workflowExecutor = newFixedThreadPool(DEFAULT_WORKFLOW_THREADS,
+                groupedThreads("onos/workflow-exec", "worker-%d", log));
+        handlerTaskBatchExecutor = newSingleThreadExecutor(
+                groupedThreads("onos/workflow", "handlertask-batch", log));
+        handlerTaskExecutor = newFixedThreadPool(DEFAULT_EVENTTASK_THREADS,
+                groupedThreads("onos/handlertask-exec", "worker-%d", log));
+        eventMapTriggerExecutor = newSingleThreadScheduledExecutor(
+                groupedThreads("onos/workflow-engine", "eventmap-trigger-executor"));
+
+        (new WorkplaceWorkflow(this, workflowStore)).registerWorkflows();
+        JsonDataModelTree data = new JsonDataModelTree(JsonNodeFactory.instance.objectNode());
+        workplaceStore.registerWorkplace(Workplace.SYSTEM_WORKPLACE,
+                new DefaultWorkplace(Workplace.SYSTEM_WORKPLACE, data));
+
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        leadershipService.withdraw(appId.name());
+        workplaceStore.unsetDelegate(workplaceStoreDelegate);
+        workflowBatchExecutor.shutdown();
+        workflowExecutor.shutdown();
+        handlerTaskBatchExecutor.shutdown();
+        handlerTaskExecutor.shutdown();
+        eventMapTriggerExecutor.shutdown();
+        log.info("Stopped");
+    }
+
+    @Override
+    public void execInitWorklet(WorkflowContext context) {
+
+        Workflow workflow = workflowStore.get(context.workflowId());
+        if (workflow == null) {
+            log.error("Invalid workflow {}", context.workflowId());
+            return;
+        }
+
+        initWorkletExecution(context);
+        try {
+            Worklet initWorklet = workflow.init(context);
+            if (initWorklet != null) {
+                initWorklet.process(context);
+            }
+
+        } catch (WorkflowException e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            context.setCause(e.getMessage());
+            context.setState(WorkflowState.EXCEPTION);
+            workplaceStore.commitContext(context.name(), context, false);
+            return;
+        }
+        // trigger the execution of next worklet.
+        workplaceStore.registerContext(context.name(), context);
+    }
+
+    @Override
+    public void eventMapTrigger(Event event, EventHintSupplier supplier) {
+
+        if (event.subject() instanceof SystemWorkflowContext) {
+            return;
+        }
+
+        Map<String, String> eventMap;
+
+        String eventHint;
+        try {
+            eventHint = supplier.apply(event);
+        } catch (Throwable e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            return;
+        }
+        if (eventHint == null) {
+            // do nothing
+            log.error("Invalid eventHint, event: {}", event);
+            return;
+        }
+
+        try {
+            eventMap = eventMapStore.getEventMap(event.getClass().getName(), eventHint);
+        } catch (WorkflowException e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            return;
+        }
+
+        if (Objects.isNull(eventMap) || eventMap.isEmpty()) {
+            // do nothing;
+            log.debug("Invalid eventMap, event: {}", event);
+            return;
+        }
+
+        for (Map.Entry<String, String> entry : eventMap.entrySet()) {
+            String contextName = entry.getKey();
+            String workletType = entry.getValue();
+            WorkflowContext context = workplaceStore.getContext(contextName);
+            if (Objects.isNull(context)) {
+                log.info("Invalid context: {}, event: {}", contextName, event);
+                continue;
+            }
+            EventTask eventtask = EventTask.builder()
+                    .event(event)
+                    .eventHint(eventHint)
+                    .context(context)
+                    .workletType(workletType)
+                    .build();
+
+            log.info("eventtaskAccumulator.add: task: {}", eventtask);
+            eventtaskAccumulator.add(eventtask);
+        }
+    }
+
+    @Override
+    public void registerEventMap(Class<? extends Event> eventType, String eventHint,
+                                 String contextName, String workletType) throws WorkflowException {
+        eventMapStore.registerEventMap(eventType.getName(), eventHint, contextName, workletType);
+        for (int i = 0; i < MAX_REGISTER_EVENTMAP_WAITS; i++) {
+            Map<String, String> eventMap = eventMapStore.getEventMap(eventType.getName(), eventHint);
+            if (eventMap != null && eventMap.containsKey(contextName)) {
+                return;
+            }
+            try {
+                log.info("sleep {}", i);
+                Thread.sleep(10L * (i + 1));
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    @Override
+    protected void post(WorkflowDataEvent event) {
+
+        if (event.subject() == null || !isRelevant(event.subject())) {
+            log.debug("ignore event {}", event);
+            return;
+        }
+
+        // trigger next worklet selection
+        WorkflowData dataModelContainer = event.subject();
+        switch (event.type()) {
+            case INSERT:
+            case UPDATE:
+                if (dataModelContainer.triggerNext()) {
+                    log.info("workflowAccumulator.add: {}", dataModelContainer);
+                    workflowAccumulator.add(dataModelContainer);
+                } else {
+                    log.debug("pass-workflowAccumulator.add: {}", dataModelContainer);
+                }
+                break;
+            case REMOVE:
+                break;
+            default:
+        }
+
+        // trigger EventTask for WorkflowDataEvent
+        eventMapTriggerExecutor.submit(
+                () -> eventMapTrigger(
+                        event,
+                        // event hint supplier
+                        (ev) -> {
+                            if (ev == null || ev.subject() == null) {
+                                return null;
+                            }
+
+                            if (ev.subject() instanceof WorkflowData) {
+                                return ((WorkflowData) ev.subject()).name();
+                            } else {
+                                return null;
+                            }
+                        }
+                )
+        );
+    }
+
+    /**
+     * Checks whether this workflow data job is relevant to this ONOS node.
+     * @param job workflow data
+     * @return checking result
+     */
+    private boolean isRelevant(WorkflowData job) {
+        // distributes event processing with work-partition
+        return partitionService.isMine(job.distributor(), this::stringHash);
+    }
+
+    /**
+     * Gets hash of the string.
+     * @param str string to get a hash
+     * @return hash value
+     */
+    public Long stringHash(String str) {
+        return UUID.nameUUIDFromBytes(str.getBytes()).getMostSignificantBits();
+    }
+
+    /**
+     * Class for handler task batch delegation.
+     */
+    private class InternalHandlerTaskBatchDelegate implements HandlerTaskBatchDelegate {
+        @Override
+        public void execute(Collection<Collection<HandlerTask>> operations) {
+            log.debug("Execute {} operation(s).", operations.size());
+
+            CompletableFuture.runAsync(() -> {
+                List<CompletableFuture<Collection<HandlerTask>>> futures = operations.stream()
+                        .map(
+                                x -> CompletableFuture.completedFuture(x)
+                                        .thenApplyAsync(WorkFlowEngine.this::processHandlerTask, handlerTaskExecutor)
+                                        .exceptionally(e -> null)
+                        )
+                        .collect(Collectors.toList());
+
+                // waiting the completion of futures
+                futures.parallelStream().forEach(x -> x.join());
+
+            }, handlerTaskBatchExecutor).exceptionally(e -> {
+                log.error("Error submitting batches:", e);
+                return null;
+            }).thenRun(eventtaskAccumulator::ready);
+        }
+    }
+
+    /**
+     * Initializes worklet execution.
+     * @param context workflow context
+     */
+    private void initWorkletExecution(WorkflowContext context) {
+        context.setState(WorkflowState.RUNNING);
+        context.setCause("");
+        context.setWorkflowExecutionService(this);
+        context.setWorkflowStore(workflowStore);
+        context.setWorkplaceStore(workplaceStore);
+        context.waitCompletion(null, null, null, 0L);
+        context.setTriggerNext(false);
+    }
+
+    /**
+     * Processes handler tasks.
+     * @param tasks handler tasks
+     * @return handler tasks processed
+     */
+    private Collection<HandlerTask> processHandlerTask(Collection<HandlerTask> tasks) {
+
+        for (HandlerTask task : tasks) {
+            if (task instanceof EventTimeoutTask) {
+                execEventTimeoutTask((EventTimeoutTask) task);
+            } else if (task instanceof TimeoutTask) {
+                execTimeoutTask((TimeoutTask) task);
+            } else if (task instanceof EventTask) {
+                execEventTask((EventTask) task);
+            } else {
+                log.error("Unsupported handler task {}", task);
+            }
+        }
+
+        return null;
+    }
+
+    /**
+     * Executes event task.
+     * @param task event task
+     * @return event task
+     */
+    private EventTask execEventTask(EventTask task) {
+
+        Map<String, String> eventMap = null;
+        try {
+            eventMap = eventMapStore.getEventMap(task.event().getClass().getName(), task.eventHint());
+        } catch (WorkflowException e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            return task;
+        }
+
+        if (Objects.isNull(eventMap) || eventMap.isEmpty()) {
+            return task;
+        }
+
+        if (Objects.isNull(eventMap.get(task.context().name()))) {
+            return task;
+        }
+
+        log.debug("execEventTask- task: {}, hash: {}", task, stringHash(task.context().distributor()));
+
+        WorkflowContext context = (WorkflowContext) (task.context());
+        Workflow workflow = workflowStore.get(context.workflowId());
+        if (workflow == null) {
+            log.error("Invalid workflow {}", context.workflowId());
+            return task;
+        }
+
+        WorkflowContext latestContext = workplaceStore.getContext(context.name());
+        if (latestContext == null) {
+            log.error("Invalid workflow context {}", context.name());
+            return task;
+        }
+
+        try {
+            Worklet worklet = workflow.getWorkletInstance(task.workletType());
+            if (!Objects.equals(latestContext.current(), worklet.tag())) {
+                log.error("Current worklet({}) is not mismatched with task work({}). Ignored.",
+                        latestContext.current(), worklet.tag());
+                return task;
+            }
+
+            if (worklet == Worklet.Common.COMPLETED || worklet == Worklet.Common.INIT) {
+                log.error("Current worklet is {}, Ignored", worklet);
+                return task;
+            }
+
+            initWorkletExecution(latestContext);
+
+            log.info("processHandlerTask.isCompleted-task:{}, latest:{}", task, latestContext);
+            if (worklet.isCompleted(latestContext, task.event())) {
+                eventMapStore.unregisterEventMap(
+                        task.eventType(), task.eventHint(), latestContext.name());
+
+                workplaceStore.commitContext(latestContext.name(), latestContext, true);
+                return null;
+            } else {
+                workplaceStore.commitContext(latestContext.name(), latestContext, false);
+            }
+
+        } catch (WorkflowException e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            latestContext.setCause(e.getMessage());
+            latestContext.setState(WorkflowState.EXCEPTION);
+            workplaceStore.commitContext(latestContext.name(), latestContext, false);
+        }
+
+        return task;
+    }
+
+    /**
+     * Executes event timeout task.
+     * @param task event timeout task
+     * @return handler task
+     */
+    private HandlerTask execEventTimeoutTask(EventTimeoutTask task) {
+
+        Map<String, String> eventMap = null;
+        try {
+            eventMap = eventMapStore.getEventMap(task.eventType(), task.eventHint());
+        } catch (WorkflowException e) {
+            log.error("execEventTimeoutTask: Exception: {}, trace: {}",
+                    e, Lists.newArrayList(e.getStackTrace()));
+            return task;
+        }
+
+        if (Objects.isNull(eventMap) || eventMap.isEmpty()) {
+            return task;
+        }
+
+        if (Objects.isNull(eventMap.get(task.context().name()))) {
+            return task;
+        }
+
+        log.debug("execEventTimeoutTask- task: {}, hash: {}", task, stringHash(task.context().distributor()));
+
+        WorkflowContext context = task.context();
+        Workflow workflow = workflowStore.get(context.workflowId());
+        if (workflow == null) {
+            log.error("execEventTimeoutTask: Invalid workflow {}", context.workflowId());
+            return task;
+        }
+
+        WorkflowContext latestContext = workplaceStore.getContext(context.name());
+        if (latestContext == null) {
+            log.error("execEventTimeoutTask: Invalid workflow context {}", context.name());
+            return task;
+        }
+
+        try {
+            Worklet worklet = workflow.getWorkletInstance(task.workletType());
+            if (!Objects.equals(latestContext.current(), worklet.tag())) {
+                log.error("execEventTimeoutTask: Current worklet({}) is not mismatched with task work({}). Ignored.",
+                        latestContext.current(), worklet.tag());
+                return task;
+            }
+
+            if (worklet == Worklet.Common.COMPLETED || worklet == Worklet.Common.INIT) {
+                log.error("execEventTimeoutTask: Current worklet is {}, Ignored", worklet);
+                return task;
+            }
+
+            initWorkletExecution(latestContext);
+
+            log.info("execEventTimeoutTask.timeout-task:{}, latest:{}", task, latestContext);
+            eventMapStore.unregisterEventMap(
+                    task.eventType(), task.eventHint(), latestContext.name());
+
+            worklet.timeout(latestContext);
+            workplaceStore.commitContext(latestContext.name(), latestContext, latestContext.triggerNext());
+
+        } catch (WorkflowException e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            latestContext.setCause(e.getMessage());
+            latestContext.setState(WorkflowState.EXCEPTION);
+            workplaceStore.commitContext(latestContext.name(), latestContext, false);
+        }
+
+        return task;
+    }
+
+    /**
+     * Executes timeout task.
+     * @param task time out task
+     * @return handler task
+     */
+    private HandlerTask execTimeoutTask(TimeoutTask task) {
+
+        log.debug("execTimeoutTask- task: {}, hash: {}", task, stringHash(task.context().distributor()));
+
+        WorkflowContext context = (WorkflowContext) (task.context());
+        Workflow workflow = workflowStore.get(context.workflowId());
+        if (workflow == null) {
+            log.error("execTimeoutTask: Invalid workflow {}", context.workflowId());
+            return task;
+        }
+
+        WorkflowContext latestContext = workplaceStore.getContext(context.name());
+        if (latestContext == null) {
+            log.error("execTimeoutTask: Invalid workflow context {}", context.name());
+            return task;
+        }
+
+        try {
+            Worklet worklet = workflow.getWorkletInstance(task.workletType());
+            if (!Objects.equals(latestContext.current(), worklet.tag())) {
+                log.error("execTimeoutTask: Current worklet({}) is not mismatched with task work({}). Ignored.",
+                        latestContext.current(), worklet.tag());
+                return task;
+            }
+
+            if (worklet == Worklet.Common.COMPLETED || worklet == Worklet.Common.INIT) {
+                log.error("execTimeoutTask: Current worklet is {}, Ignored", worklet);
+                return task;
+            }
+
+            initWorkletExecution(latestContext);
+
+            worklet.timeout(latestContext);
+            workplaceStore.commitContext(latestContext.name(), latestContext, latestContext.triggerNext());
+
+        } catch (WorkflowException e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            latestContext.setCause(e.getMessage());
+            latestContext.setState(WorkflowState.EXCEPTION);
+            workplaceStore.commitContext(latestContext.name(), latestContext, false);
+        }
+
+        return task;
+    }
+
+    /**
+     * Class for delegation of workflow batch execution.
+     */
+    private class InternalWorkflowBatchDelegate implements WorkflowBatchDelegate {
+        @Override
+        public void execute(Collection<WorkflowData> operations) {
+            log.debug("Execute {} operation(s).", operations.size());
+
+            CompletableFuture.runAsync(() -> {
+                List<CompletableFuture<WorkflowData>> futures = operations.stream()
+                        .map(
+                                x -> CompletableFuture.completedFuture(x)
+                                .thenApplyAsync(WorkFlowEngine.this::execWorkflow, workflowExecutor)
+                                .exceptionally(e -> null)
+                        )
+                        .collect(Collectors.toList());
+
+                // waiting the completion of futures
+                futures.parallelStream().forEach(x -> x.join());
+
+            }, workflowBatchExecutor).exceptionally(e -> {
+                log.error("Error submitting batches:", e);
+                return null;
+            }).thenRun(workflowAccumulator::ready);
+        }
+    }
+
+    /**
+     * Executes workflow.
+     * @param dataModelContainer workflow data model container(workflow or workplace)
+     * @return
+     */
+    private WorkflowData execWorkflow(WorkflowData dataModelContainer) {
+        if (dataModelContainer instanceof WorkflowContext) {
+            return execWorkflowContext((WorkflowContext) dataModelContainer);
+        } else if (dataModelContainer instanceof Workplace) {
+            return execWorkplace((Workplace) dataModelContainer);
+        } else {
+            log.error("Invalid context {}", dataModelContainer);
+            return null;
+        }
+    }
+
+    /**
+     * Executes workflow context.
+     * @param context workflow context
+     * @return workflow context
+     */
+    private WorkflowContext execWorkflowContext(WorkflowContext context) {
+
+        Workflow workflow = workflowStore.get(context.workflowId());
+        if (workflow == null) {
+            log.error("Invalid workflow {}", context.workflowId());
+            return null;
+        }
+
+        final WorkflowContext latestContext = workplaceStore.getContext(context.name());
+        if (latestContext == null) {
+            log.error("Invalid workflow context {}", context.name());
+            return null;
+        }
+
+        initWorkletExecution(latestContext);
+
+        try {
+            final Worklet worklet = workflow.next(latestContext);
+
+            if (worklet == Worklet.Common.INIT) {
+                log.error("workflow.next gave INIT. It cannot be executed (context: {})", context.name());
+                return latestContext;
+            }
+
+            latestContext.setCurrent(worklet);
+            if (worklet == Worklet.Common.COMPLETED) {
+
+                if (workflow.attributes().contains(REMOVE_AFTER_COMPLETE)) {
+                    workplaceStore.removeContext(latestContext.name());
+                    return null;
+                } else {
+                    latestContext.setState(WorkflowState.IDLE);
+                    workplaceStore.commitContext(latestContext.name(), latestContext, false);
+                    return latestContext;
+                }
+            }
+
+            log.info("execWorkflowContext.process:{}, {}", worklet.tag(), latestContext);
+            worklet.process(latestContext);
+
+            if (latestContext.completionEventType() != null) {
+                if (latestContext.completionEventGenerator() == null) {
+                    String msg = String.format("Invalid exepecting event(%s), generator(%s)",
+                            latestContext.completionEventType(),
+                            latestContext.completionEventGenerator());
+                    throw new WorkflowException(msg);
+                }
+
+                registerEventMap(latestContext.completionEventType(), latestContext.completionEventHint(),
+                        latestContext.name(), worklet.tag());
+
+                latestContext.completionEventGenerator().apply();
+
+                if (latestContext.completionEventTimeout() != 0L) {
+                    final EventTimeoutTask eventTimeoutTask = EventTimeoutTask.builder()
+                            .context(latestContext)
+                            .workletType(worklet.tag())
+                            .eventType(latestContext.completionEventType().getName())
+                            .eventHint(latestContext.completionEventHint())
+                            .build();
+                    timerChain.schedule(latestContext.completionEventTimeout(),
+                            () -> {
+                                eventtaskAccumulator.add(eventTimeoutTask);
+                            });
+                }
+            } else {
+                if (latestContext.completionEventTimeout() != 0L) {
+                    final TimeoutTask timeoutTask = TimeoutTask.builder()
+                            .context(latestContext)
+                            .workletType(worklet.tag())
+                            .build();
+
+                    timerChain.schedule(latestContext.completionEventTimeout(),
+                            () -> {
+                                eventtaskAccumulator.add(timeoutTask);
+                            });
+                }
+            }
+
+            workplaceStore.commitContext(latestContext.name(), latestContext, latestContext.triggerNext());
+
+        } catch (WorkflowException e) {
+            log.error("Exception: {}, trace: {}", e, Lists.newArrayList(e.getStackTrace()));
+            latestContext.setCause(e.getMessage());
+            latestContext.setState(WorkflowState.EXCEPTION);
+            workplaceStore.commitContext(latestContext.name(), latestContext, false);
+        }
+
+        return latestContext;
+    }
+
+    /**
+     * Execute workplace.
+     * @param workplace workplace
+     * @return workplace
+     */
+    private Workplace execWorkplace(Workplace workplace) {
+
+        return null;
+    }
+
+}
\ No newline at end of file
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowAccumulator.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowAccumulator.java
new file mode 100644
index 0000000..d13b66f
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowAccumulator.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.google.common.collect.Maps;
+import org.onlab.util.AbstractAccumulator;
+import org.onosproject.workflow.api.WorkflowData;
+import org.onosproject.workflow.api.WorkflowBatchDelegate;
+
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.Timer;
+
+/**
+ * An accumulator for building batches of workflow operations. Only one batch should
+ * be in process per instance at a time.
+ */
+public class WorkflowAccumulator extends AbstractAccumulator<WorkflowData> {
+
+    private static final int DEFAULT_MAX_EVENTS = 1000;
+    private static final int DEFAULT_MAX_IDLE_MS = 10;
+    private static final int DEFAULT_MAX_BATCH_MS = 50;
+
+    private static final Timer TIMER = new Timer("onos-workflow-op-batching");
+
+    private final WorkflowBatchDelegate delegate;
+
+    private volatile boolean ready;
+
+    /**
+     * Creates an intent operation accumulator.
+     *
+     * @param delegate the intent batch delegate
+     */
+    protected WorkflowAccumulator(WorkflowBatchDelegate delegate) {
+        super(TIMER, DEFAULT_MAX_EVENTS, DEFAULT_MAX_BATCH_MS, DEFAULT_MAX_IDLE_MS);
+        this.delegate = delegate;
+        // Assume that the delegate is ready for worklettype at the start
+        ready = true; //TODO validate the assumption that delegate is ready
+    }
+
+    @Override
+    public void processItems(List<WorkflowData> items) {
+        ready = false;
+        delegate.execute(reduce(items));
+    }
+
+    private Collection<WorkflowData> reduce(List<WorkflowData> ops) {
+        Map<String, WorkflowData> map = Maps.newHashMap();
+        for (WorkflowData op : ops) {
+            map.put(op.name(), op);
+        }
+        //TODO check the version... or maybe workplaceStore will handle this.
+        return map.values();
+    }
+
+    @Override
+    public boolean isReady() {
+        return ready;
+    }
+
+    /**
+     * Making accumulator to be ready.
+     */
+    public void ready() {
+        ready = true;
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowManager.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowManager.java
new file mode 100644
index 0000000..804716e
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowManager.java
@@ -0,0 +1,145 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.JsonNodeFactory;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.apache.felix.scr.annotations.Service;
+import org.onosproject.net.config.NetworkConfigRegistry;
+import org.onosproject.net.config.NetworkConfigService;
+import org.onosproject.workflow.api.DefaultWorkplace;
+import org.onosproject.workflow.api.JsonDataModelTree;
+import org.onosproject.workflow.api.Workflow;
+import org.onosproject.workflow.api.WorkflowContext;
+import org.onosproject.workflow.api.WorkflowDescription;
+import org.onosproject.workflow.api.WorkflowException;
+import org.onosproject.workflow.api.WorkflowService;
+import org.onosproject.workflow.api.WorkflowExecutionService;
+import org.onosproject.workflow.api.WorkflowStore;
+import org.onosproject.workflow.api.Workplace;
+import org.onosproject.workflow.api.WorkplaceDescription;
+import org.onosproject.workflow.api.WorkplaceStore;
+import org.slf4j.Logger;
+
+import java.net.URI;
+import java.util.Objects;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+@Component(immediate = true)
+@Service
+public class WorkflowManager implements WorkflowService {
+
+    protected static final Logger log = getLogger(WorkflowManager.class);
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    private WorkflowExecutionService workflowExecutionService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkplaceStore workplaceStore;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkflowStore workflowStore;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    private NetworkConfigService networkConfigService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    private NetworkConfigRegistry networkConfigRegistry;
+
+    private WorkflowNetConfigListener netcfgListener;
+
+    @Activate
+    public void activate() {
+        netcfgListener = new WorkflowNetConfigListener(this);
+        networkConfigRegistry.registerConfigFactory(netcfgListener.getConfigFactory());
+        networkConfigService.addListener(netcfgListener);
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        networkConfigService.removeListener(netcfgListener);
+        networkConfigRegistry.unregisterConfigFactory(netcfgListener.getConfigFactory());
+        log.info("Stopped");
+    }
+
+    @Override
+    public void createWorkplace(WorkplaceDescription wpDesc) throws WorkflowException {
+        log.info("createWorkplace: {}", wpDesc);
+
+        JsonNode root;
+        if (wpDesc.data().isPresent()) {
+            root = wpDesc.data().get();
+        } else {
+            root = JsonNodeFactory.instance.objectNode();
+        }
+        DefaultWorkplace workplace =
+                new DefaultWorkplace(wpDesc.name(), new JsonDataModelTree(root));
+        workplaceStore.registerWorkplace(wpDesc.name(), workplace);
+    }
+
+    @Override
+    public void removeWorkplace(WorkplaceDescription wpDesc) throws WorkflowException {
+        log.info("removeWorkplace: {}", wpDesc);
+        //TODO: Removing workflows belong to this workplace
+        workplaceStore.removeWorkplace(wpDesc.name());
+    }
+
+    @Override
+    public void clearWorkplace() throws WorkflowException {
+        log.info("clearWorkplace");
+        workplaceStore.getWorkplaces().stream()
+                .filter(wp -> !Objects.equals(wp.name(), Workplace.SYSTEM_WORKPLACE))
+                .forEach(wp -> workplaceStore.removeWorkplace(wp.name()));
+    }
+
+    @Override
+    public void invokeWorkflow(WorkflowDescription wfDesc) throws WorkflowException {
+        invokeWorkflow(wfDesc.toJson());
+    }
+
+    @Override
+    public void invokeWorkflow(JsonNode worklowDescJson) throws WorkflowException {
+        log.info("invokeWorkflow: {}", worklowDescJson);
+
+        Workplace workplace = workplaceStore.getWorkplace(Workplace.SYSTEM_WORKPLACE);
+        if (Objects.isNull(workplace)) {
+            throw new WorkflowException("Invalid system workplace");
+        }
+
+        Workflow workflow = workflowStore.get(URI.create(WorkplaceWorkflow.WF_CREATE_WORKFLOW));
+        if (Objects.isNull(workflow)) {
+            throw new WorkflowException("Invalid workflow " + WorkplaceWorkflow.WF_CREATE_WORKFLOW);
+        }
+
+        WorkflowContext context = workflow.buildSystemContext(workplace, new JsonDataModelTree(worklowDescJson));
+        workflowExecutionService.execInitWorklet(context);
+    }
+
+    @Override
+    public void terminateWorkflow(WorkflowDescription wfDesc) throws WorkflowException {
+        log.info("terminateWorkflow: {}", wfDesc);
+        if (Objects.nonNull(workplaceStore.getContext(wfDesc.workflowContextName()))) {
+            workplaceStore.removeContext(wfDesc.workflowContextName());
+        }
+    }
+}
\ No newline at end of file
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowNetConfig.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowNetConfig.java
new file mode 100644
index 0000000..2bca555
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowNetConfig.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.config.Config;
+import org.onosproject.workflow.api.DefaultRpcDescription;
+import org.onosproject.workflow.api.RpcDescription;
+import org.onosproject.workflow.api.WorkflowException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+
+public class WorkflowNetConfig extends Config<ApplicationId> {
+
+    private static final Logger log = LoggerFactory.getLogger(WorkflowNetConfig.class);
+
+    /**
+     * Workflow RPC pointer.
+     */
+    private static final String RPC_PTR = "/rpc";
+
+    public Collection<RpcDescription> getRpcDescriptions() throws WorkflowException {
+
+        JsonNode node = object.at(RPC_PTR);
+        if (!(node instanceof ArrayNode)) {
+            throw new WorkflowException("invalid rpc for " + object);
+        }
+        ArrayNode rpcArrayNode = (ArrayNode) node;
+
+        List<RpcDescription> rpcDescriptions = new ArrayList<>();
+        for (JsonNode rpcNode : rpcArrayNode) {
+            rpcDescriptions.add(DefaultRpcDescription.valueOf(rpcNode));
+        }
+
+        return rpcDescriptions;
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowNetConfigListener.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowNetConfigListener.java
new file mode 100644
index 0000000..59a57e9
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkflowNetConfigListener.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import org.onosproject.core.ApplicationId;
+import org.onosproject.net.config.ConfigFactory;
+import org.onosproject.net.config.NetworkConfigEvent;
+import org.onosproject.net.config.NetworkConfigListener;
+import org.onosproject.net.config.basics.SubjectFactories;
+import org.onosproject.workflow.api.DefaultWorkflowDescription;
+import org.onosproject.workflow.api.RpcDescription;
+import org.onosproject.workflow.api.WorkflowService;
+import org.onosproject.workflow.api.WorkflowException;
+import org.onosproject.workflow.api.DefaultWorkplaceDescription;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.ScheduledExecutorService;
+
+import static java.util.concurrent.Executors.newSingleThreadScheduledExecutor;
+import static org.onlab.util.Tools.groupedThreads;
+
+public class WorkflowNetConfigListener implements NetworkConfigListener {
+
+    private static final Logger log = LoggerFactory.getLogger(WorkflowNetConfigListener.class);
+
+    public static final String CONFIG_KEY = "workflow";
+    public static final String EXECUTOR_GROUPNAME = "onos/workflow-netcfg";
+    public static final String EXECUTOR_PATTERN = "netcfg-event-handler";
+
+    private final ConfigFactory<ApplicationId, WorkflowNetConfig> configFactory =
+            new ConfigFactory<ApplicationId, WorkflowNetConfig>(
+                    SubjectFactories.APP_SUBJECT_FACTORY, WorkflowNetConfig.class, CONFIG_KEY) {
+                @Override
+                public WorkflowNetConfig createConfig() {
+                    return new WorkflowNetConfig();
+                }
+            };
+
+    private final WorkflowService workflowService;
+
+    private final ScheduledExecutorService executor =
+            newSingleThreadScheduledExecutor(groupedThreads(EXECUTOR_GROUPNAME, EXECUTOR_PATTERN));
+
+    public WorkflowNetConfigListener(WorkflowService workflowService) {
+        this.workflowService = workflowService;
+    }
+
+    public ConfigFactory<ApplicationId, WorkflowNetConfig> getConfigFactory() {
+        return configFactory;
+    }
+
+    @Override
+    public boolean isRelevant(NetworkConfigEvent event) {
+        return true;
+    }
+
+    @Override
+    public void event(NetworkConfigEvent event) {
+        log.info("Configuration event: {}", event);
+        switch (event.type()) {
+            case CONFIG_ADDED:
+            case CONFIG_UPDATED:
+                if (!event.config().isPresent()) {
+                    log.error("No configuration found");
+                    return;
+                }
+                WorkflowNetConfig config = (WorkflowNetConfig) event.config().get();
+
+                //Single thread executor(locking is not required)
+                executor.execute(new Handler(workflowService, config));
+                break;
+            default:
+                break;
+        }
+    }
+
+    public static class Handler implements Runnable {
+
+        private WorkflowService workflowService;
+        private WorkflowNetConfig config;
+
+        public Handler(WorkflowService workflowService, WorkflowNetConfig config) {
+            this.workflowService = workflowService;
+            this.config = config;
+        }
+
+        @Override
+        public void run() {
+
+            try {
+                Collection<RpcDescription> rpcs = config.getRpcDescriptions();
+                log.info("" + rpcs);
+                for (RpcDescription rpc : rpcs) {
+                    if (!rpcMap.containsKey(rpc.op())) {
+                        log.error("Invalid RPC: {}", rpc);
+                        continue;
+                    }
+
+                    rpcMap.get(rpc.op()).apply(this.workflowService, rpc);
+                }
+            } catch (WorkflowException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    @FunctionalInterface
+    public interface RpcCall {
+        void apply(WorkflowService workflowService, RpcDescription rpcDesc) throws WorkflowException;
+    }
+
+    private static Map<String, RpcCall> rpcMap = new HashMap<>();
+    static {
+        rpcMap.put("workplace.create",
+                (service, desc) -> service.createWorkplace(DefaultWorkplaceDescription.valueOf(desc.params())));
+        rpcMap.put("workplace.remove",
+                (service, desc) -> service.removeWorkplace(DefaultWorkplaceDescription.valueOf(desc.params())));
+        rpcMap.put("workflow.invoke",
+                (service, desc) -> service.invokeWorkflow(desc.params()));
+        rpcMap.put("workflow.terminate",
+                (service, desc) -> service.terminateWorkflow(DefaultWorkflowDescription.valueOf(desc.params())));
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkplaceWorkflow.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkplaceWorkflow.java
new file mode 100644
index 0000000..af62aaa
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkplaceWorkflow.java
@@ -0,0 +1,213 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.BooleanNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onosproject.event.Event;
+import org.onosproject.workflow.api.AbstractWorklet;
+import org.onosproject.workflow.api.DefaultWorkflowContext;
+import org.onosproject.workflow.api.DefaultWorkplace;
+import org.onosproject.workflow.api.ImmutableListWorkflow;
+import org.onosproject.workflow.api.JsonDataModelTree;
+import org.onosproject.workflow.api.SystemWorkflowContext;
+import org.onosproject.workflow.api.Workflow;
+import org.onosproject.workflow.api.WorkflowAttribute;
+import org.onosproject.workflow.api.WorkflowContext;
+import org.onosproject.workflow.api.WorkflowData;
+import org.onosproject.workflow.api.WorkflowDataEvent;
+import org.onosproject.workflow.api.DefaultWorkflowDescription;
+import org.onosproject.workflow.api.WorkflowDescription;
+import org.onosproject.workflow.api.WorkflowException;
+import org.onosproject.workflow.api.WorkflowExecutionService;
+import org.onosproject.workflow.api.WorkflowStore;
+import org.onosproject.workflow.api.Workplace;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.URI;
+import java.util.Objects;
+
+import static org.onosproject.workflow.api.WorkflowDataEvent.Type.INSERT;
+
+public class WorkplaceWorkflow {
+
+    private static final Logger log = LoggerFactory.getLogger(WorkplaceWorkflow.class);
+
+    private WorkflowExecutionService workflowExecutionService;
+    private WorkflowStore workflowStore;
+
+    public WorkplaceWorkflow(WorkflowExecutionService workflowExecutionService,
+                             WorkflowStore workflowStore) {
+        this.workflowExecutionService = workflowExecutionService;
+        this.workflowStore = workflowStore;
+    }
+
+    public static final String WF_CREATE_WORKFLOW = "workplace.create-workflow";
+
+    public void registerWorkflows() {
+
+        Workflow workflow = ImmutableListWorkflow.builder()
+                .id(URI.create(WF_CREATE_WORKFLOW))
+                .attribute(WorkflowAttribute.REMOVE_AFTER_COMPLETE)
+                .init(ChangeDistributor.class.getName())
+                .chain(CreateWorkplace.class.getName())
+                .chain(CreateWorkflowContext.class.getName())
+                .build();
+        workflowStore.register(workflow);
+    }
+
+    public abstract static class AbsWorkflowWorklet extends AbstractWorklet {
+
+        protected WorkflowDescription getWorkflowDesc(WorkflowContext context) throws WorkflowException {
+
+            JsonNode root = ((JsonDataModelTree) context.data()).root();
+            return DefaultWorkflowDescription.valueOf(root);
+        }
+    }
+
+    public static class ChangeDistributor extends AbsWorkflowWorklet {
+
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+
+            String workplaceName = getWorkflowDesc(context).workplaceName();
+            // Sets workflow job distribution hash value to make this workflow to be executed on the
+            // same cluster node to execute workplace tasks.
+            ((SystemWorkflowContext) context).setDistributor(workplaceName);
+
+            context.completed();
+       }
+    }
+
+    public static class CreateWorkplace extends AbsWorkflowWorklet {
+
+        @Override
+        public boolean isNext(WorkflowContext context) throws WorkflowException {
+
+            WorkflowDescription wfDesc = getWorkflowDesc(context);
+
+            Workplace workplace = context.workplaceStore().getWorkplace(wfDesc.workplaceName());
+            return Objects.isNull(workplace);
+        }
+
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+
+            WorkflowDescription wfDesc = getWorkflowDesc(context);
+
+            // creates workplace with empty data model
+            DefaultWorkplace workplace = new DefaultWorkplace(wfDesc.workplaceName(), new JsonDataModelTree());
+            log.info("registerWorkplace {}", workplace);
+            context.waitCompletion(WorkflowDataEvent.class, wfDesc.workplaceName(),
+                    () -> context.workplaceStore().registerWorkplace(wfDesc.workplaceName(), workplace),
+                    60000L
+            );
+        }
+
+        @Override
+        public boolean isCompleted(WorkflowContext context, Event event)throws WorkflowException {
+
+            if (!(event instanceof WorkflowDataEvent)) {
+                return false;
+            }
+
+            WorkflowDataEvent wfEvent = (WorkflowDataEvent) event;
+            WorkflowData wfData = wfEvent.subject();
+
+            WorkflowDescription wfDesc = getWorkflowDesc(context);
+
+            if (wfData instanceof Workplace
+                    && Objects.equals(wfData.name(), wfDesc.workplaceName())
+                    && wfEvent.type() == INSERT) {
+                log.info("isCompleted(true): event:{}, context:{}, workplace:{}",
+                        event, context, wfDesc.workplaceName());
+                return true;
+            } else {
+                log.info("isCompleted(false) event:{}, context:{}, workplace:{}",
+                        event, context, wfDesc.workplaceName());
+                return false;
+            }
+        }
+    }
+
+    public static class CreateWorkflowContext extends AbsWorkflowWorklet {
+
+        private static final String SUBMITTED = "submitted";
+
+        private boolean isSubmitted(WorkflowContext context) throws WorkflowException {
+            JsonNode node = ((JsonDataModelTree) context.data()).nodeAt("/" + SUBMITTED);
+            if (!(node instanceof BooleanNode)) {
+                return false;
+            }
+            return node.asBoolean();
+        }
+
+        private void submitTrue(WorkflowContext context) throws WorkflowException {
+            JsonNode root = ((JsonDataModelTree) context.data()).root();
+            if (!(root instanceof ObjectNode)) {
+                throw new WorkflowException("Invalid root node for " + context);
+            }
+            ((ObjectNode) root).put(SUBMITTED, true);
+        }
+
+        @Override
+        public boolean isNext(WorkflowContext context) throws WorkflowException {
+
+            WorkflowDescription wfDesc = getWorkflowDesc(context);
+
+            String contextName = DefaultWorkflowContext.nameBuilder(wfDesc.id(), wfDesc.workplaceName());
+            if (Objects.isNull(context.workplaceStore().getContext(contextName))) {
+                return (!isSubmitted(context));
+            } else {
+                return false;
+            }
+        }
+
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+
+            WorkflowDescription wfDesc = getWorkflowDesc(context);
+
+            Workplace workplace = context.workplaceStore().getWorkplace(wfDesc.workplaceName());
+            if (Objects.isNull(workplace)) {
+
+                log.error("Failed to find workplace with " + wfDesc.workplaceName());
+                throw new WorkflowException("Failed to find workplace with " + wfDesc.workplaceName());
+            }
+
+            Workflow workflow = context.workflowStore().get(wfDesc.id());
+            if (Objects.isNull(workflow)) {
+                throw new WorkflowException("Failed to find workflow with " + wfDesc.id());
+            }
+
+            //String contextName = DefaultWorkflowContext.nameBuilder(wfDesc.id(), wfDesc.workplaceName());
+            String contextName = wfDesc.workflowContextName();
+            if (Objects.nonNull(context.workplaceStore().getContext(contextName))) {
+                throw new WorkflowException(contextName + " exists already");
+            }
+
+            JsonDataModelTree subTree = new JsonDataModelTree(wfDesc.data());
+            WorkflowContext buildingContext = workflow.buildContext(workplace, subTree);
+            log.info("registerContext {}", buildingContext.name());
+            context.workplaceStore().registerContext(buildingContext.name(), buildingContext);
+            submitTrue(context);
+
+            context.completed();
+        }
+    }
+}
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/SampleWorkflow.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/SampleWorkflow.java
new file mode 100644
index 0000000..a1ca9cc
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/SampleWorkflow.java
@@ -0,0 +1,287 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.workflow.impl.example;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.JsonNodeType;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onosproject.net.device.DeviceService;
+import org.onosproject.workflow.api.AbstractWorklet;
+import org.onosproject.workflow.api.DataModelTree;
+import org.onosproject.workflow.api.ImmutableListWorkflow;
+import org.onosproject.workflow.api.JsonDataModelTree;
+import org.onosproject.workflow.api.Workflow;
+import org.onosproject.workflow.api.WorkflowContext;
+import org.onosproject.workflow.api.WorkflowException;
+import org.onosproject.workflow.api.WorkflowExecutionService;
+import org.onosproject.workflow.api.WorkflowStore;
+import org.onosproject.workflow.api.WorkplaceStore;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.net.URI;
+
+/**
+ * Class for sample workflow.
+ */
+@Component(immediate = true)
+public class SampleWorkflow {
+
+    private static final Logger log = LoggerFactory.getLogger(SampleWorkflow.class);
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkflowStore workflowStore;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkplaceStore workplaceStore;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected WorkflowExecutionService workflowExecutionService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected DeviceService deviceService;
+
+
+    @Activate
+    public void activate() {
+        log.info("Activated");
+
+        registerWorkflows();
+
+    }
+
+    @Deactivate
+    public void deactivate() {
+        log.info("Deactivated");
+    }
+
+    /**
+     * Registers example workflows.
+     */
+    private void registerWorkflows() {
+        // registering class-loader
+        workflowStore.registerLocal(this.getClass().getClassLoader());
+
+        // registering new workflow definition
+        URI uri = URI.create("sample.workflow-0");
+        Workflow workflow = ImmutableListWorkflow.builder()
+                .id(uri)
+                .chain(SampleWorklet1.class.getName())
+                .chain(SampleWorklet2.class.getName())
+                .chain(SampleWorklet3.class.getName())
+                .chain(SampleWorklet4.class.getName())
+                .chain(SampleWorklet5.class.getName())
+                .build();
+        workflowStore.register(workflow);
+
+        // registering new workflow definition
+        uri = URI.create("sample.workflow-1");
+        workflow = ImmutableListWorkflow.builder()
+                .id(uri)
+                .chain(SampleWorklet3.class.getName())
+                .chain(SampleWorklet2.class.getName())
+                .chain(SampleWorklet1.class.getName())
+                .chain(SampleWorklet4.class.getName())
+                .chain(SampleWorklet5.class.getName())
+                .build();
+        workflowStore.register(workflow);
+
+        // registering new workflow definition
+        uri = URI.create("sample.workflow-2");
+        workflow = ImmutableListWorkflow.builder()
+                .id(uri)
+                .chain(SampleWorklet1.class.getName())
+                .chain(SampleWorklet3.class.getName())
+                .chain(SampleWorklet2.class.getName())
+                .chain(SampleWorklet4.class.getName())
+                .chain(SampleWorklet5.class.getName())
+                .build();
+        workflowStore.register(workflow);
+    }
+
+    /**
+     * Abstract class for sample worklet.
+     */
+    public abstract static class AbsSampleWorklet extends AbstractWorklet {
+
+        protected static final String SAMPLE_DATAMODEL_PTR = "/sample/job";
+
+        /**
+         * Constructor for sample worklet.
+         */
+        protected AbsSampleWorklet() {
+
+        }
+
+        /**
+         * Allocates or gets data model.
+         * @param context workflow context
+         * @return json object node
+         * @throws WorkflowException workflow exception
+         */
+        protected ObjectNode allocOrGetModel(WorkflowContext context) throws WorkflowException {
+
+            JsonDataModelTree tree = (JsonDataModelTree) context.data();
+            JsonNode params = tree.root();
+
+            if (params.at(SAMPLE_DATAMODEL_PTR).getNodeType() == JsonNodeType.MISSING) {
+                tree.alloc(SAMPLE_DATAMODEL_PTR, DataModelTree.Nodetype.MAP);
+            }
+            return (ObjectNode) params.at(SAMPLE_DATAMODEL_PTR);
+        }
+
+        /**
+         * Gets data model.
+         * @param context workflow context
+         * @return json object node
+         * @throws WorkflowException workflow exception
+         */
+        protected ObjectNode getDataModel(WorkflowContext context) throws WorkflowException {
+            DataModelTree tree = context.data();
+            return ((JsonDataModelTree) tree.subtree(SAMPLE_DATAMODEL_PTR)).rootObject();
+        }
+
+        /**
+         * Sleeps for 'ms' milli seconds.
+         * @param ms milli seconds to sleep
+         */
+        protected void sleep(long ms) {
+            try {
+                Thread.sleep(ms);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+
+    /**
+     * Class for sample worklet-1.
+     */
+    public static class SampleWorklet1 extends AbsSampleWorklet {
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = getDataModel(context);
+            node.put("work1", "done");
+            log.info("workflow-process {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(30);
+
+            context.completed(); //Complete the job of worklet in the process
+        }
+
+        @Override
+        public boolean isNext(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = allocOrGetModel(context);
+            log.info("workflow-isNext {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(30);
+            return !node.has("work1");
+
+        }
+    }
+
+    /**
+     * Class for sample worklet-2 (using timeout).
+     */
+    public static class SampleWorklet2 extends AbsSampleWorklet {
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = getDataModel(context);
+            node.put("work2", "done");
+            log.info("workflow-process {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(50);
+
+            context.waitFor(50L); //Timeout will happen after 50 milli seconds.
+        }
+
+        @Override
+        public void timeout(WorkflowContext context) throws WorkflowException {
+            context.completed(); //Complete the job of worklet by timeout
+        }
+
+        @Override
+        public boolean isNext(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = allocOrGetModel(context);
+            log.info("workflow-isNext {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(50);
+            return !node.has("work2");
+        }
+    }
+
+    public static class SampleWorklet3 extends AbsSampleWorklet {
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = getDataModel(context);
+            node.put("work3", "done");
+            log.info("workflow-process {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(10);
+
+            context.completed();
+        }
+
+        @Override
+        public boolean isNext(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = allocOrGetModel(context);
+            log.info("workflow-isNext {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(10);
+            return !node.has("work3");
+        }
+    }
+
+    public static class SampleWorklet4 extends AbsSampleWorklet {
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = getDataModel(context);
+            node.put("work4", "done");
+            log.info("workflow-process {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(10);
+
+            context.completed();
+        }
+
+        @Override
+        public boolean isNext(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = allocOrGetModel(context);
+            log.info("workflow-isNext {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(10);
+            return !node.has("work4");
+        }
+    }
+
+    public static class SampleWorklet5 extends AbsSampleWorklet {
+        @Override
+        public void process(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = getDataModel(context);
+            node.put("work5", "done");
+            log.info("workflow-process {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(10);
+
+            context.completed();
+        }
+
+        @Override
+        public boolean isNext(WorkflowContext context) throws WorkflowException {
+            ObjectNode node = allocOrGetModel(context);
+            log.info("workflow-isNext {}-{}", context.workplaceName(), this.getClass().getSimpleName());
+            sleep(10);
+            return !node.has("work5");
+        }
+    }
+
+}
\ No newline at end of file
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/package-info.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/package-info.java
new file mode 100644
index 0000000..2fbc9549a
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Workflow example package.
+ */
+package org.onosproject.workflow.impl.example;
\ No newline at end of file
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/package-info.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/package-info.java
new file mode 100644
index 0000000..f82c452
--- /dev/null
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Workflow implementation package.
+ */
+package org.onosproject.workflow.impl;
\ No newline at end of file
diff --git a/apps/workflow/app/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/apps/workflow/app/src/main/resources/OSGI-INF/blueprint/shell-config.xml
new file mode 100644
index 0000000..cee835a
--- /dev/null
+++ b/apps/workflow/app/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -0,0 +1,20 @@
+<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">
+
+	<command-bundle xmlns="http://karaf.apache.org/xmlns/shell/v1.1.0">
+		<command>
+			<action class="org.onosproject.workflow.cli.WorkFlowStoreCommand"></action>
+		</command>
+		<command>
+			<action class="org.onosproject.workflow.cli.WorkplaceStoreCommand"></action>
+		</command>
+		<command>
+			<action class="org.onosproject.workflow.cli.WorkFlowCommand"></action>
+		</command>
+		<command>
+			<action class="org.onosproject.workflow.cli.WorkFlowEventMapCommand"></action>
+		</command>
+		<command>
+			<action class="org.onosproject.workflow.cli.WorkFlowTestCommand"></action>
+		</command>
+	</command-bundle>
+</blueprint>
diff --git a/modules.bzl b/modules.bzl
index 2a12806..37229ee 100644
--- a/modules.bzl
+++ b/modules.bzl
@@ -250,6 +250,7 @@
     "//apps/imr:onos-apps-imr-oar",
     "//apps/nodemetrics:onos-apps-nodemetrics-oar",
     # "//web/gui2:onos-web-gui2-oar",
+    "//apps/workflow:onos-apps-workflow-oar",
 ]
 
 PROTOCOL_APPS = [
diff --git a/modules.defs b/modules.defs
index 1584e60..158b07c 100644
--- a/modules.defs
+++ b/modules.defs
@@ -257,6 +257,7 @@
     '//apps/layout:onos-apps-layout-oar',
     '//apps/imr:onos-apps-imr-oar',
     '//apps/inbandtelemetry/app:onos-apps-inbandtelemetry-app-oar',
+    '//apps/workflow:onos-apps-workflow-oar',
     # nodemetrics application
     '//apps/nodemetrics:onos-apps-nodemetrics-oar',
     #'//web/gui2:onos-web-gui2-oar',