diff --git a/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortChain.java b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortChain.java
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+++ b/apps/vtn/vtnrsc/src/main/java/org/onosproject/vtnrsc/PortChain.java
@@ -0,0 +1,148 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.vtnrsc;
+
+import java.util.List;
+
+/**
+ * Abstraction of an entity providing Port Chain information.
+ * A Port Chain (Service Function Path) consists of
+ * a set of Neutron ports, to define the sequence of service functions
+ * a set of flow classifiers, to specify the classified traffic flows to enter the chain
+ */
+public interface PortChain {
+
+    /**
+     * Returns the ID of this port chain.
+     *
+     * @return the port chain id
+     */
+    PortChainId portChainId();
+
+    /**
+     * Returns the tenant id of this port chain.
+     *
+     * @return the tenant id
+     */
+    TenantId tenantId();
+
+    /**
+     * Returns the name of this port chain.
+     *
+     * @return name of port chain
+     */
+    String name();
+
+    /**
+     * Returns the description of this port chain.
+     *
+     * @return description of port chain
+     */
+    String description();
+
+    /**
+     * Returns the list of port pair groups associated with
+     * this port chain.
+     *
+     * @return list of port pair groups
+     */
+    List<PortPairGroupId> portPairGroups();
+
+    /**
+     * Returns the list of flow classifiers associated with
+     * this port chain.
+     *
+     * @return list of flow classifiers
+     */
+    List<FlowClassifierId> flowClassifiers();
+
+    /**
+     * Returns whether this port chain is an exact match to the port chain given
+     * in the argument.
+     * <p>
+     * Exact match means the port pair groups and flow classifiers match
+     * with the given port chain. It does not consider the port chain id, name
+     * and description.
+     * </p>
+     *
+     * @param portChain other port chain to match against
+     * @return true if the port chains are an exact match, otherwise false
+     */
+    boolean exactMatch(PortChain portChain);
+
+    /**
+     * A port chain builder..
+     */
+    interface Builder {
+
+        /**
+         * Assigns the port chain id to this object.
+         *
+         * @param portChainId the port chain id
+         * @return this the builder object
+         */
+        Builder setId(PortChainId portChainId);
+
+        /**
+         * Assigns tenant id to this object.
+         *
+         * @param tenantId tenant id of the port chain
+         * @return this the builder object
+         */
+        Builder setTenantId(TenantId tenantId);
+
+        /**
+         * Assigns the name to this object.
+         *
+         * @param name name of the port chain
+         * @return this the builder object
+         */
+        Builder setName(String name);
+
+        /**
+         * Assigns the description to this object.
+         *
+         * @param description description of the port chain
+         * @return this the builder object
+         */
+        Builder setDescription(String description);
+
+        /**
+         * Assigns the port pair groups associated with the port chain
+         * to this object.
+         *
+         * @param portPairGroups list of port pair groups
+         * @return this the builder object
+         */
+        Builder setPortPairGroups(List<PortPairGroupId> portPairGroups);
+
+        /**
+         * Assigns the flow classifiers associated with the port chain
+         * to this object.
+         *
+         * @param flowClassifiers list of flow classifiers
+         * @return this the builder object
+         */
+        Builder setFlowClassifiers(List<FlowClassifierId> flowClassifiers);
+
+        /**
+         * Builds a port chain object.
+         *
+         * @return a port chain.
+         */
+        PortChain build();
+    }
+}