basic test for ReplicaInfoManager

Change-Id: I604b8b24b9ac0896e6dd2a0650092af76f37968d

@@ -52,6 +52,12 @@
           <artifactId>easymock</artifactId>
           <scope>test</scope>
         </dependency>
+        <dependency>
+          <groupId>org.onlab.onos</groupId>
+          <artifactId>onos-api</artifactId>
+          <classifier>tests</classifier>
+          <scope>test</scope>
+        </dependency>
     </dependencies>
 
 </project>

@@ -3,7 +3,7 @@ package org.onlab.onos.store.flow;
 import org.onlab.onos.net.DeviceId;
 
 /**
- * Service to return where the Replica should be placed.
+ * Service to return where the replica should be placed.
  */
 public interface ReplicaInfoService {
 
@@ -15,4 +15,19 @@ public interface ReplicaInfoService {
      * @return placement information
      */
     ReplicaInfo getReplicaInfoFor(DeviceId deviceId);
+
+    /**
+     * Adds the specified replica placement info change listener.
+     *
+     * @param listener the replica placement info change listener
+     */
+    void addListener(ReplicaInfoEventListener listener);
+
+    /**
+     * Removes the specified replica placement info change listener.
+     *
+     * @param listener the replica placement info change listener
+     */
+    void removeListener(ReplicaInfoEventListener listener);
+
 }

 package org.onlab.onos.store.flow.impl;
 
+import static com.google.common.base.Preconditions.checkNotNull;
 import static org.slf4j.LoggerFactory.getLogger;
 import static org.onlab.onos.store.flow.ReplicaInfoEvent.Type.MASTER_CHANGED;
 
@@ -66,6 +67,16 @@ public class ReplicaInfoManager implements ReplicaInfoService {
                                Collections.<NodeId>emptyList());
     }
 
+    @Override
+    public void addListener(ReplicaInfoEventListener listener) {
+        listenerRegistry.addListener(checkNotNull(listener));
+    }
+
+    @Override
+    public void removeListener(ReplicaInfoEventListener listener) {
+        listenerRegistry.removeListener(checkNotNull(listener));
+    }
+
     final class InternalMastershipListener implements MastershipListener {
 
         @Override

+package org.onlab.onos.store.flow.impl;
+
+import static com.google.common.base.Preconditions.checkState;
+import static org.junit.Assert.*;
+
+import java.util.Collections;
+import java.util.Map;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onlab.onos.cluster.NodeId;
+import org.onlab.onos.event.AbstractListenerRegistry;
+import org.onlab.onos.event.DefaultEventSinkRegistry;
+import org.onlab.onos.event.Event;
+import org.onlab.onos.event.EventDeliveryService;
+import org.onlab.onos.event.EventSink;
+import org.onlab.onos.mastership.MastershipEvent;
+import org.onlab.onos.mastership.MastershipEvent.Type;
+import org.onlab.onos.mastership.MastershipListener;
+import org.onlab.onos.mastership.MastershipService;
+import org.onlab.onos.mastership.MastershipServiceAdapter;
+import org.onlab.onos.net.DeviceId;
+import org.onlab.onos.store.flow.ReplicaInfo;
+import org.onlab.onos.store.flow.ReplicaInfoEvent;
+import org.onlab.onos.store.flow.ReplicaInfoEventListener;
+import org.onlab.onos.store.flow.ReplicaInfoService;
+
+import com.google.common.base.Optional;
+import com.google.common.collect.Maps;
+
+public class ReplicaInfoManagerTest {
+
+
+    private static final DeviceId DID1 = DeviceId.deviceId("of:1");
+    private static final DeviceId DID2 = DeviceId.deviceId("of:2");
+    private static final NodeId NID1 = new NodeId("foo");
+
+    private ReplicaInfoManager mgr;
+    private ReplicaInfoService service;
+
+    private AbstractListenerRegistry<MastershipEvent, MastershipListener>
+        mastershipListenerRegistry;
+    private TestEventDispatcher eventDispatcher;
+
+
+    @Before
+    public void setUp() throws Exception {
+        mastershipListenerRegistry = new AbstractListenerRegistry<>();
+
+        mgr = new ReplicaInfoManager();
+        service = mgr;
+
+        eventDispatcher = new TestEventDispatcher();
+        mgr.eventDispatcher = eventDispatcher;
+        mgr.mastershipService = new TestMastershipService();
+
+        // register dummy mastership event source
+        mgr.eventDispatcher.addSink(MastershipEvent.class, mastershipListenerRegistry);
+
+        mgr.activate();
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        mgr.deactivate();
+    }
+
+    @Test
+    public void testGetReplicaInfoFor() {
+        ReplicaInfo info1 = service.getReplicaInfoFor(DID1);
+        assertEquals(Optional.of(NID1), info1.master());
+        // backups are always empty for now
+        assertEquals(Collections.emptyList(), info1.backups());
+
+        ReplicaInfo info2 = service.getReplicaInfoFor(DID2);
+        assertEquals("There's no master", Optional.absent(), info2.master());
+        // backups are always empty for now
+        assertEquals(Collections.emptyList(), info2.backups());
+    }
+
+    @Test
+    public void testReplicaInfoEvent() throws InterruptedException {
+        final CountDownLatch latch = new CountDownLatch(1);
+        service.addListener(new MasterNodeCheck(latch, DID1, NID1));
+
+        // fake MastershipEvent
+        eventDispatcher.post(new MastershipEvent(Type.MASTER_CHANGED, DID1, NID1));
+
+        assertTrue(latch.await(1, TimeUnit.SECONDS));
+    }
+
+
+    private final class MasterNodeCheck implements ReplicaInfoEventListener {
+        private final CountDownLatch latch;
+        private Optional<NodeId> expectedMaster;
+        private DeviceId expectedDevice;
+
+
+        MasterNodeCheck(CountDownLatch latch, DeviceId did,
+                NodeId nid) {
+            this.latch = latch;
+            this.expectedMaster = Optional.fromNullable(nid);
+            this.expectedDevice = did;
+        }
+
+        @Override
+        public void event(ReplicaInfoEvent event) {
+            assertEquals(expectedDevice, event.subject());
+            assertEquals(expectedMaster, event.replicaInfo().master());
+            // backups are always empty for now
+            assertEquals(Collections.emptyList(), event.replicaInfo().backups());
+            latch.countDown();
+        }
+    }
+
+
+    private final class TestMastershipService
+            extends MastershipServiceAdapter
+            implements MastershipService {
+
+        private Map<DeviceId, NodeId> masters;
+
+        TestMastershipService() {
+            masters = Maps.newHashMap();
+            masters.put(DID1, NID1);
+            // DID2 has no master
+        }
+
+        @Override
+        public NodeId getMasterFor(DeviceId deviceId) {
+            return masters.get(deviceId);
+        }
+
+        @Override
+        public void addListener(MastershipListener listener) {
+            mastershipListenerRegistry.addListener(listener);
+        }
+
+        @Override
+        public void removeListener(MastershipListener listener) {
+            mastershipListenerRegistry.removeListener(listener);
+        }
+    }
+
+
+    // code clone
+    /**
+     * Implements event delivery system that delivers events synchronously, or
+     * in-line with the post method invocation.
+     */
+    private static class TestEventDispatcher extends DefaultEventSinkRegistry
+            implements EventDeliveryService {
+
+        @SuppressWarnings({ "rawtypes", "unchecked" })
+        @Override
+        public void post(Event event) {
+            EventSink sink = getSink(event.getClass());
+            checkState(sink != null, "No sink for event %s", event);
+            sink.process(event);
+        }
+    }
+}