[ONOS-6395] (vNet) Defining mastership service

Defines the interface for mastership service for virtual networks.
This service is needed to achieve HA and load balancing.

Change-Id: I5b68511c114ebd818429f4f6eb622dff95dd8630
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java
index 69f849e..c4493c7 100644
--- a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkManager.java
@@ -51,6 +51,7 @@
 import org.onosproject.incubator.net.virtual.provider.VirtualNetworkProvider;
 import org.onosproject.incubator.net.virtual.provider.VirtualNetworkProviderRegistry;
 import org.onosproject.incubator.net.virtual.provider.VirtualNetworkProviderService;
+import org.onosproject.mastership.MastershipService;
 import org.onosproject.net.ConnectPoint;
 import org.onosproject.net.DeviceId;
 import org.onosproject.net.HostId;
@@ -443,6 +444,8 @@
             service = new VirtualNetworkGroupManager(this, network.id());
         } else if (serviceKey.serviceClass.equals(FlowObjectiveService.class)) {
             service = new VirtualNetworkFlowObjectiveManager(this, network.id());
+        } else if (serviceKey.serviceClass.equals(MastershipService.class)) {
+            service = new VirtualNetworkMastershipManager(this, network.id());
         } else {
             return null;
         }
diff --git a/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkMastershipManager.java b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkMastershipManager.java
new file mode 100644
index 0000000..273ecbb
--- /dev/null
+++ b/incubator/net/src/main/java/org/onosproject/incubator/net/virtual/impl/VirtualNetworkMastershipManager.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2017-present 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.incubator.net.virtual.impl;
+
+import org.onlab.metrics.MetricsService;
+import org.onosproject.cluster.NodeId;
+import org.onosproject.cluster.RoleInfo;
+import org.onosproject.core.MetricsHelper;
+import org.onosproject.incubator.net.virtual.NetworkId;
+import org.onosproject.incubator.net.virtual.VirtualNetworkMastershipStore;
+import org.onosproject.incubator.net.virtual.VirtualNetworkService;
+import org.onosproject.incubator.net.virtual.event.AbstractVirtualListenerManager;
+import org.onosproject.mastership.MastershipAdminService;
+import org.onosproject.mastership.MastershipEvent;
+import org.onosproject.mastership.MastershipListener;
+import org.onosproject.mastership.MastershipService;
+import org.onosproject.mastership.MastershipStoreDelegate;
+import org.onosproject.mastership.MastershipTerm;
+import org.onosproject.mastership.MastershipTermService;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.MastershipRole;
+
+import java.util.Set;
+import java.util.concurrent.CompletableFuture;
+
+public class VirtualNetworkMastershipManager
+        extends AbstractVirtualListenerManager<MastershipEvent, MastershipListener>
+        implements MastershipService, MastershipAdminService, MastershipTermService,
+        MetricsHelper {
+
+    VirtualNetworkMastershipStore store;
+    MastershipStoreDelegate storeDelegate;
+
+    /**
+     * Creates a new VirtualNetworkMastershipManager object.
+     *
+     * @param manager virtual network manager service
+     * @param networkId virtual network identifier
+     */
+    public VirtualNetworkMastershipManager(VirtualNetworkService manager, NetworkId networkId) {
+        super(manager, networkId, MastershipEvent.class);
+
+        store = serviceDirectory.get(VirtualNetworkMastershipStore.class);
+        this.storeDelegate = new InternalDelegate();
+        store.setDelegate(networkId, this.storeDelegate);
+    }
+
+    @Override
+    public MetricsService metricsService() {
+        return null;
+    }
+
+    @Override
+    public MastershipTerm getMastershipTerm(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public CompletableFuture<Void> setRole(NodeId instance, DeviceId deviceId, MastershipRole role) {
+        return null;
+    }
+
+    @Override
+    public void balanceRoles() {
+
+    }
+
+    @Override
+    public MastershipRole getLocalRole(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public CompletableFuture<MastershipRole> requestRoleFor(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public CompletableFuture<Void> relinquishMastership(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public NodeId getMasterFor(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public RoleInfo getNodesFor(DeviceId deviceId) {
+        return null;
+    }
+
+    @Override
+    public Set<DeviceId> getDevicesOf(NodeId nodeId) {
+        return null;
+    }
+
+    public class InternalDelegate implements MastershipStoreDelegate {
+        @Override
+        public void notify(MastershipEvent event) {
+            post(event);
+        }
+    }
+}