diff --git a/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/GnmiClientImpl.java b/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/GnmiClientImpl.java
new file mode 100644
index 0000000..74a9ec0
--- /dev/null
+++ b/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/GnmiClientImpl.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 protocols.gnmi.ctl.java.org.onosproject.gnmi.ctl;
+
+import gnmi.Gnmi.CapabilityRequest;
+import gnmi.Gnmi.CapabilityResponse;
+import gnmi.Gnmi.GetRequest;
+import gnmi.Gnmi.GetResponse;
+import gnmi.Gnmi.SetRequest;
+import gnmi.Gnmi.SetResponse;
+import gnmi.gNMIGrpc;
+import io.grpc.ManagedChannel;
+import io.grpc.StatusRuntimeException;
+import org.onosproject.gnmi.api.GnmiClientKey;
+import org.onosproject.grpc.ctl.AbstractGrpcClient;
+import org.slf4j.Logger;
+import org.onosproject.gnmi.api.GnmiClient;
+
+import java.util.concurrent.CompletableFuture;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of gNMI client.
+ */
+public class GnmiClientImpl extends AbstractGrpcClient implements GnmiClient {
+    private final Logger log = getLogger(getClass());
+    private final gNMIGrpc.gNMIBlockingStub blockingStub;
+
+    public GnmiClientImpl(GnmiClientKey clientKey, ManagedChannel managedChannel) {
+        super(clientKey, managedChannel);
+        this.blockingStub = gNMIGrpc.newBlockingStub(managedChannel);
+    }
+
+    @Override
+    public CompletableFuture<CapabilityResponse> capability() {
+        return supplyInContext(this::doCapability, "capability");
+    }
+
+    @Override
+    public CompletableFuture<GetResponse> get(GetRequest request) {
+        return supplyInContext(() -> doGet(request), "get");
+    }
+
+    @Override
+    public CompletableFuture<SetResponse> set(SetRequest request) {
+        return supplyInContext(() -> doSet(request), "set");
+    }
+
+    private CapabilityResponse doCapability() {
+        CapabilityRequest request = CapabilityRequest.newBuilder().build();
+        try {
+            return blockingStub.capabilities(request);
+        } catch (StatusRuntimeException e) {
+            log.warn("Unable to get capability from {}: {}", deviceId, e.getMessage());
+            return null;
+        }
+    }
+
+    private GetResponse doGet(GetRequest request) {
+        try {
+            return blockingStub.get(request);
+        } catch (StatusRuntimeException e) {
+            log.warn("Unable to get data from {}: {}", deviceId, e.getMessage());
+            return null;
+        }
+    }
+
+    private SetResponse doSet(SetRequest request) {
+        try {
+            return blockingStub.set(request);
+        } catch (StatusRuntimeException e) {
+            log.warn("Unable to set data to {}: {}", deviceId, e.getMessage());
+            return null;
+        }
+    }
+}
diff --git a/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/GnmiControllerImpl.java b/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/GnmiControllerImpl.java
new file mode 100644
index 0000000..8392c4a
--- /dev/null
+++ b/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/GnmiControllerImpl.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 protocols.gnmi.ctl.java.org.onosproject.gnmi.ctl;
+
+import io.grpc.ManagedChannel;
+import org.onosproject.gnmi.api.GnmiClient;
+import org.onosproject.gnmi.api.GnmiClientKey;
+import org.onosproject.gnmi.api.GnmiController;
+import org.onosproject.gnmi.api.GnmiEvent;
+import org.onosproject.gnmi.api.GnmiEventListener;
+import org.onosproject.grpc.ctl.AbstractGrpcClientController;
+import org.osgi.service.component.annotations.Activate;
+import org.osgi.service.component.annotations.Component;
+import org.osgi.service.component.annotations.Deactivate;
+import org.slf4j.Logger;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Implementation of gNMI controller.
+ */
+@Component(immediate = true, service = GnmiController.class)
+public class GnmiControllerImpl
+        extends AbstractGrpcClientController<GnmiClientKey, GnmiClient, GnmiEvent, GnmiEventListener>
+        implements GnmiController {
+    private final Logger log = getLogger(getClass());
+
+    @Activate
+    public void activate() {
+        super.activate();
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        super.deactivate();
+        log.info("Stopped");
+    }
+
+    @Override
+    protected GnmiClient createClientInstance(GnmiClientKey clientKey, ManagedChannel channel) {
+        return new GnmiClientImpl(clientKey, channel);
+    }
+}
diff --git a/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/package-info.java b/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/package-info.java
new file mode 100644
index 0000000..ae46aa4
--- /dev/null
+++ b/protocols/gnmi/ctl/src/main/java/org/onosproject/gnmi/ctl/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.
+ */
+
+/**
+ * Implementation classes of the gNMI protocol subsystem.
+ */
+package protocols.gnmi.ctl.java.org.onosproject.gnmi.ctl;
\ No newline at end of file