SEBA-640 IgmpProxy should use distributed storage infrastructure of ONOS

Change-Id: I4b1c4d326a5501e9c0e046e3ee8d973ca5f73d70
diff --git a/api/src/main/java/org/opencord/igmpproxy/statemachine/StateMachineId.java b/api/src/main/java/org/opencord/igmpproxy/statemachine/StateMachineId.java
new file mode 100644
index 0000000..38d2bf1
--- /dev/null
+++ b/api/src/main/java/org/opencord/igmpproxy/statemachine/StateMachineId.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright 2017-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.opencord.igmpproxy.statemachine;
+
+import com.google.common.base.MoreObjects;
+import org.onlab.packet.Ip4Address;
+import org.onosproject.net.DeviceId;
+
+import java.util.Objects;
+
+/**
+ * Identification of state machine.
+ */
+public final class StateMachineId {
+    private DeviceId deviceId;
+    private Ip4Address groupIp;
+
+    /**
+     * Constructor for serializer.
+     */
+    private StateMachineId() {
+        this.deviceId = null;
+        this.groupIp = null;
+    }
+
+    private StateMachineId(DeviceId deviceId, Ip4Address groupIp) {
+        this.deviceId = deviceId;
+        this.groupIp = groupIp;
+    }
+
+    /**
+     * Creates new state-machine identification using device-id and group-ip.
+     *
+     * @param deviceId device id of state-machie
+     * @param groupIp  group ip of state-machine
+     * @return created identification
+     */
+    public static StateMachineId of(DeviceId deviceId, Ip4Address groupIp) {
+        return new StateMachineId(deviceId, groupIp);
+    }
+
+    /**
+     * Returns device id of identification.
+     *
+     * @return device id
+     */
+    public DeviceId getDeviceId() {
+        return deviceId;
+    }
+
+    /**
+     * Returns group ip of identification.
+     *
+     * @return group ip
+     */
+    public Ip4Address getGroupIp() {
+        return groupIp;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(this)
+                .add("deviceId", deviceId)
+                .add("groupIp", groupIp)
+                .toString();
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        StateMachineId that = (StateMachineId) o;
+        return Objects.equals(deviceId, that.deviceId) &&
+                Objects.equals(groupIp, that.groupIp);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(deviceId, groupIp);
+    }
+}