mastership manager listens to cluster events

Change-Id: I925967ef8ada88b9116d292d623d2f0f4cda3a8d
diff --git a/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java b/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java
index a8d2052..2b9b048 100644
--- a/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java
+++ b/core/net/src/main/java/org/onlab/onos/cluster/impl/MastershipManager.java
@@ -6,6 +6,8 @@
 import org.apache.felix.scr.annotations.Reference;
 import org.apache.felix.scr.annotations.ReferenceCardinality;
 import org.apache.felix.scr.annotations.Service;
+import org.onlab.onos.cluster.ClusterEvent;
+import org.onlab.onos.cluster.ClusterEventListener;
 import org.onlab.onos.cluster.ClusterService;
 import org.onlab.onos.cluster.MastershipAdminService;
 import org.onlab.onos.cluster.MastershipEvent;
@@ -49,15 +51,19 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected ClusterService clusterService;
 
+    private ClusterEventListener clusterListener = new InternalClusterEventListener();
+
     @Activate
     public void activate() {
         eventDispatcher.addSink(MastershipEvent.class, listenerRegistry);
+        clusterService.addListener(clusterListener);
         log.info("Started");
     }
 
     @Deactivate
     public void deactivate() {
         eventDispatcher.removeSink(MastershipEvent.class);
+        clusterService.removeListener(clusterListener);
         log.info("Stopped");
     }
 
@@ -141,4 +147,27 @@
 
     }
 
+    //callback for reacting to cluster events
+    private class InternalClusterEventListener implements ClusterEventListener {
+
+        @Override
+        public void event(ClusterEvent event) {
+            switch (event.type()) {
+                //FIXME: worry about addition when the time comes
+                case INSTANCE_ADDED:
+                case INSTANCE_ACTIVATED:
+                     break;
+                case INSTANCE_REMOVED:
+                case INSTANCE_DEACTIVATED:
+                    for (DeviceId d : getDevicesOf(event.subject().id())) {
+                        //this method should be an admin iface?
+                        relinquishMastership(d);
+                    }
+                    break;
+                default:
+                    log.warn("unknown cluster event {}", event);
+            }
+        }
+
+    }
 }
diff --git a/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java b/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
index 80b9b18..eeab313 100644
--- a/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
+++ b/core/net/src/main/java/org/onlab/onos/net/device/impl/DeviceManager.java
@@ -10,6 +10,7 @@
 import org.onlab.onos.cluster.MastershipEvent;
 import org.onlab.onos.cluster.MastershipListener;
 import org.onlab.onos.cluster.MastershipService;
+import org.onlab.onos.cluster.MastershipTermService;
 import org.onlab.onos.event.AbstractListenerRegistry;
 import org.onlab.onos.event.EventDeliveryService;
 import org.onlab.onos.net.Device;
@@ -74,11 +75,14 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
     protected MastershipService mastershipService;
 
+    protected MastershipTermService termService;
+
     @Activate
     public void activate() {
         store.setDelegate(delegate);
         eventDispatcher.addSink(DeviceEvent.class, listenerRegistry);
         mastershipService.addListener(mastershipListener);
+        termService = mastershipService.requestTermService();
         log.info("Started");
     }
 
diff --git a/core/net/src/main/java/org/onlab/onos/net/topology/impl/DefaultTopologyProvider.java b/core/net/src/main/java/org/onlab/onos/net/topology/impl/DefaultTopologyProvider.java
index 770f368..7ee6ddd 100644
--- a/core/net/src/main/java/org/onlab/onos/net/topology/impl/DefaultTopologyProvider.java
+++ b/core/net/src/main/java/org/onlab/onos/net/topology/impl/DefaultTopologyProvider.java
@@ -65,8 +65,8 @@
     private volatile boolean isStarted = false;
 
     private TopologyProviderService providerService;
-    private DeviceListener deviceListener = new InnerDeviceListener();
-    private LinkListener linkListener = new InnerLinkListener();
+    private DeviceListener deviceListener = new InternalDeviceListener();
+    private LinkListener linkListener = new InternalLinkListener();
 
     private EventAccumulator accumulator;
     private ExecutorService executor;
@@ -132,7 +132,7 @@
     }
 
     // Callback for device events
-    private class InnerDeviceListener implements DeviceListener {
+    private class InternalDeviceListener implements DeviceListener {
         @Override
         public void event(DeviceEvent event) {
             DeviceEvent.Type type = event.type();
@@ -144,7 +144,7 @@
     }
 
     // Callback for link events
-    private class InnerLinkListener implements LinkListener {
+    private class InternalLinkListener implements LinkListener {
         @Override
         public void event(LinkEvent event) {
             accumulator.add(event);