BUG 4554 : Ownership is not cleared when all candidates are removed
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / test / java / org / opendaylight / controller / cluster / datastore / entityownership / EntityOwnershipShardTest.java
index 2dc754472ee9aa2ce490e618b35aab261d8d1f05..eb649207f7d67c3553a22f2bd4d16ef2eb7b8097 100644 (file)
@@ -7,13 +7,9 @@
  */
 package org.opendaylight.controller.cluster.datastore.entityownership;
 
-import static org.hamcrest.CoreMatchers.either;
-import static org.hamcrest.CoreMatchers.equalTo;
 import static org.junit.Assert.assertEquals;
+import static org.mockito.AdditionalMatchers.or;
 import static org.mockito.Matchers.any;
-import static org.mockito.Matchers.anyBoolean;
-import static org.mockito.Matchers.argThat;
-import static org.mockito.Matchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.reset;
@@ -40,7 +36,6 @@ import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
-import org.hamcrest.Matcher;
 import org.junit.After;
 import org.junit.Test;
 import org.opendaylight.controller.cluster.datastore.AbstractShardTest;
@@ -53,6 +48,8 @@ import org.opendaylight.controller.cluster.datastore.entityownership.messages.Re
 import org.opendaylight.controller.cluster.datastore.entityownership.messages.RegisterListenerLocal;
 import org.opendaylight.controller.cluster.datastore.entityownership.messages.UnregisterCandidateLocal;
 import org.opendaylight.controller.cluster.datastore.entityownership.messages.UnregisterListenerLocal;
+import org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy.EntityOwnerSelectionStrategyConfig;
+import org.opendaylight.controller.cluster.datastore.entityownership.selectionstrategy.LastCandidateSelectionStrategy;
 import org.opendaylight.controller.cluster.datastore.identifiers.ShardIdentifier;
 import org.opendaylight.controller.cluster.datastore.messages.BatchedModifications;
 import org.opendaylight.controller.cluster.datastore.messages.CommitTransactionReply;
@@ -71,7 +68,7 @@ import org.opendaylight.controller.cluster.raft.messages.RequestVote;
 import org.opendaylight.controller.cluster.raft.messages.RequestVoteReply;
 import org.opendaylight.controller.md.cluster.datastore.model.SchemaContextHelper;
 import org.opendaylight.controller.md.sal.common.api.clustering.Entity;
-import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipCandidate;
+import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipChange;
 import org.opendaylight.controller.md.sal.common.api.clustering.EntityOwnershipListener;
 import org.opendaylight.yangtools.yang.common.QName;
 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
@@ -117,14 +114,12 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         YangInstanceIdentifier entityId = ENTITY_ID1;
         Entity entity = new Entity(ENTITY_TYPE, entityId);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
         verifyOwner(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
     }
 
     @Test
@@ -143,19 +138,15 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         YangInstanceIdentifier entityId = ENTITY_ID1;
         Entity entity = new Entity(ENTITY_TYPE, entityId);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         // Now grant the vote so the shard becomes the leader. This should retry the commit.
         peer.underlyingActor().grantVote = true;
 
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
-
         verifyOwner(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
-
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
     }
 
     @Test
@@ -182,9 +173,8 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         YangInstanceIdentifier entityId = ENTITY_ID1;
         Entity entity = new Entity(ENTITY_TYPE, entityId);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         // Wait enough time for the commit to timeout.
@@ -195,10 +185,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         follower.dropAppendEntries = false;
 
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
-
         verifyOwner(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
-
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
     }
 
     @Test
@@ -226,18 +213,14 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         YangInstanceIdentifier entityId = ENTITY_ID1;
         Entity entity = new Entity(ENTITY_TYPE, entityId);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         // Resume AppendEntries - the candidate write should now be committed.
         follower.dropAppendEntries = false;
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
-
         verifyOwner(shard, ENTITY_TYPE, entityId, LOCAL_MEMBER_NAME);
-
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
     }
 
     @Test
@@ -259,9 +242,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         shard.tell(new AppendEntries(1L, peerId, -1L, -1L, Collections.<ReplicatedLogEntry>emptyList(), -1L, -1L,
                 DataStoreVersions.CURRENT_VERSION), peer);
 
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
-
-        shard.tell(new RegisterCandidateLocal(candidate, new Entity(ENTITY_TYPE, ENTITY_ID1)), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(new Entity(ENTITY_TYPE, ENTITY_ID1)), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         MockLeader leader = peer.underlyingActor();
@@ -277,7 +258,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         shard.tell(dataStoreContextBuilder.shardTransactionCommitTimeoutInSeconds(1).build(), ActorRef.noSender());
 
-        shard.tell(new RegisterCandidateLocal(candidate, new Entity(ENTITY_TYPE, ENTITY_ID2)), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(new Entity(ENTITY_TYPE, ENTITY_ID2)), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         assertEquals("Leader received BatchedModifications", true, Uninterruptibles.awaitUninterruptibly(
@@ -294,7 +275,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         for(int i = 1; i <= max; i++) {
             YangInstanceIdentifier id = YangInstanceIdentifier.of(QName.create("test", "2015-08-14", "test" + i));
             entityIds.add(id);
-            shard.tell(new RegisterCandidateLocal(candidate, new Entity(ENTITY_TYPE, id)), kit.getRef());
+            shard.tell(new RegisterCandidateLocal(new Entity(ENTITY_TYPE, id)), kit.getRef());
         }
 
         assertEquals("Leader received BatchedModifications", true, Uninterruptibles.awaitUninterruptibly(
@@ -319,35 +300,29 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         kit.waitUntilLeader(shard);
 
         Entity entity = new Entity(ENTITY_TYPE, ENTITY_ID1);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
 
         // Register
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
 
         // Unregister
 
-        reset(candidate);
-
-        shard.tell(new UnregisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new UnregisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, "");
-        verify(candidate, never()).ownershipChanged(any(Entity.class), anyBoolean(), anyBoolean());
 
         // Register again
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
     }
 
     @Test
@@ -357,7 +332,6 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         kit.waitUntilLeader(shard);
 
         Entity entity = new Entity(ENTITY_TYPE, ENTITY_ID1);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
         ShardDataTree shardDataTree = shard.underlyingActor().getDataStore();
 
         // Add a remote candidate
@@ -367,7 +341,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         // Register local
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         // Verify the remote candidate becomes owner
@@ -375,51 +349,42 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName1);
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName1);
-        verify(candidate, never()).ownershipChanged(any(Entity.class), anyBoolean(), anyBoolean());
 
         // Add another remote candidate and verify ownership doesn't change
 
-        reset(candidate);
         String remoteMemberName2 = "remoteMember2";
         writeNode(ENTITY_OWNERS_PATH, entityOwnersWithCandidate(ENTITY_TYPE, ENTITY_ID1, remoteMemberName2), shardDataTree);
 
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName2);
         Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS);
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName1);
-        verify(candidate, never()).ownershipChanged(any(Entity.class), anyBoolean(), anyBoolean());
 
         // Remove the second remote candidate and verify ownership doesn't change
 
-        reset(candidate);
         deleteNode(candidatePath(ENTITY_TYPE, ENTITY_ID1, remoteMemberName2), shardDataTree);
 
         verifyEntityCandidateRemoved(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName2);
         Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS);
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName1);
-        verify(candidate, never()).ownershipChanged(any(Entity.class), anyBoolean(), anyBoolean());
 
         // Remove the first remote candidate and verify the local candidate becomes owner
 
-        reset(candidate);
         deleteNode(candidatePath(ENTITY_TYPE, ENTITY_ID1, remoteMemberName1), shardDataTree);
 
         verifyEntityCandidateRemoved(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName1);
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
 
         // Add the second remote candidate back and verify ownership doesn't change
 
-        reset(candidate);
         writeNode(ENTITY_OWNERS_PATH, entityOwnersWithCandidate(ENTITY_TYPE, ENTITY_ID1, remoteMemberName2), shardDataTree);
 
         verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName2);
         Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS);
         verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
-        verify(candidate, never()).ownershipChanged(any(Entity.class), anyBoolean(), anyBoolean());
 
         // Unregister the local candidate and verify the second remote candidate becomes owner
 
-        shard.tell(new UnregisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new UnregisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         verifyEntityCandidateRemoved(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
@@ -441,22 +406,20 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         TestActorRef<EntityOwnershipShard> peer1 = actorFactory.createTestActor(newShardProps(peerId1,
                 ImmutableMap.<String, String>builder().put(leaderId.toString(), ""). put(peerId2.toString(), "").build(),
-                        peerMemberName1).withDispatcher(Dispatchers.DefaultDispatcherId()), peerId1.toString());
+                        peerMemberName1, EntityOwnerSelectionStrategyConfig.newBuilder().build()).withDispatcher(Dispatchers.DefaultDispatcherId()), peerId1.toString());
 
         TestActorRef<EntityOwnershipShard> peer2 = actorFactory.createTestActor(newShardProps(peerId2,
                 ImmutableMap.<String, String>builder().put(leaderId.toString(), ""). put(peerId1.toString(), "").build(),
-                        peerMemberName2). withDispatcher(Dispatchers.DefaultDispatcherId()), peerId2.toString());
+                        peerMemberName2, EntityOwnerSelectionStrategyConfig.newBuilder().build()). withDispatcher(Dispatchers.DefaultDispatcherId()), peerId2.toString());
 
         TestActorRef<EntityOwnershipShard> leader = actorFactory.createTestActor(newShardProps(leaderId,
                 ImmutableMap.<String, String>builder().put(peerId1.toString(), peer1.path().toString()).
-                        put(peerId2.toString(), peer2.path().toString()).build(), LOCAL_MEMBER_NAME).
+                        put(peerId2.toString(), peer2.path().toString()).build(), LOCAL_MEMBER_NAME, EntityOwnerSelectionStrategyConfig.newBuilder().build()).
                 withDispatcher(Dispatchers.DefaultDispatcherId()), leaderId.toString());
         leader.tell(new ElectionTimeout(), leader);
 
         kit.waitUntilLeader(leader);
 
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
-
         // Send PeerDown and PeerUp with no entities
 
         leader.tell(new PeerDown(peerMemberName2, peerId2.toString()), ActorRef.noSender());
@@ -464,7 +427,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         // Add candidates for entity1 with the local leader as the owner
 
-        leader.tell(new RegisterCandidateLocal(candidate, new Entity(ENTITY_TYPE, ENTITY_ID1)), kit.getRef());
+        leader.tell(new RegisterCandidateLocal(new Entity(ENTITY_TYPE, ENTITY_ID1)), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
         verifyCommittedEntityCandidate(leader, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
 
@@ -489,7 +452,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         commitModification(leader, entityOwnersWithCandidate(ENTITY_TYPE, ENTITY_ID3, peerMemberName2), kit);
         verifyCommittedEntityCandidate(leader, ENTITY_TYPE, ENTITY_ID3, peerMemberName2);
 
-        leader.tell(new RegisterCandidateLocal(candidate, new Entity(ENTITY_TYPE, ENTITY_ID3)), kit.getRef());
+        leader.tell(new RegisterCandidateLocal(new Entity(ENTITY_TYPE, ENTITY_ID3)), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
         verifyCommittedEntityCandidate(leader, ENTITY_TYPE, ENTITY_ID3, LOCAL_MEMBER_NAME);
 
@@ -536,7 +499,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         peer2 = actorFactory.createTestActor(newShardProps(peerId2,
                 ImmutableMap.<String, String>builder().put(leaderId.toString(), ""). put(peerId1.toString(), "").build(),
-                        peerMemberName2). withDispatcher(Dispatchers.DefaultDispatcherId()), peerId2.toString());
+                        peerMemberName2, EntityOwnerSelectionStrategyConfig.newBuilder().build()). withDispatcher(Dispatchers.DefaultDispatcherId()), peerId2.toString());
         leader.tell(new PeerUp(peerMemberName2, peerId2.toString()), ActorRef.noSender());
         // Send PeerUp again - should be noop
         leader.tell(new PeerUp(peerMemberName2, peerId2.toString()), ActorRef.noSender());
@@ -577,7 +540,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         peer1 = actorFactory.createTestActor(newShardProps(peerId1,
                 ImmutableMap.<String, String>builder().put(leaderId.toString(), ""). put(peerId2.toString(), "").build(),
-                        peerMemberName1).withDispatcher(Dispatchers.DefaultDispatcherId()), peerId1.toString());
+                        peerMemberName1, EntityOwnerSelectionStrategyConfig.newBuilder().build()).withDispatcher(Dispatchers.DefaultDispatcherId()), peerId1.toString());
         leader.tell(new PeerUp(peerMemberName1, peerId1.toString()), ActorRef.noSender());
 
         verifyOwner(leader, ENTITY_TYPE, ENTITY_ID4, "");
@@ -626,7 +589,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         TestActorRef<EntityOwnershipShard> leader = actorFactory.createTestActor(newShardProps(leaderId,
                 ImmutableMap.<String, String>builder().put(localId.toString(), shard.path().toString()).build(),
-                    LOCAL_MEMBER_NAME).withDispatcher(Dispatchers.DefaultDispatcherId()), leaderId.toString());
+                    LOCAL_MEMBER_NAME, EntityOwnerSelectionStrategyConfig.newBuilder().build()).withDispatcher(Dispatchers.DefaultDispatcherId()), leaderId.toString());
         leader.tell(new ElectionTimeout(), leader);
 
         kit.waitUntilLeader(leader);
@@ -634,31 +597,34 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         shard.tell(new PeerAddressResolved(leaderId.toString(), leader.path().toString()), ActorRef.noSender());
 
         Entity entity = new Entity(ENTITY_TYPE, ENTITY_ID1);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
+        EntityOwnershipListener listener = mock(EntityOwnershipListener.class);
+
+        shard.tell(new RegisterListenerLocal(listener, ENTITY_TYPE), kit.getRef());
+        kit.expectMsgClass(SuccessReply.class);
 
         // Register local candidate
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
         verifyCommittedEntityCandidate(shard, entity.getType(), entity.getId(), LOCAL_MEMBER_NAME);
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
-        reset(candidate);
+        verify(listener, timeout(5000)).ownershipChanged(ownershipChange(entity, false, true, true));
+        reset(listener);
 
         // Simulate a replicated commit from the leader to remove the local candidate that would occur after a
         // network partition is healed.
 
         leader.tell(new PeerDown(LOCAL_MEMBER_NAME, localId.toString()), ActorRef.noSender());
 
-        verify(candidate, timeout(5000)).ownershipChanged(entity, true, false);
+        verify(listener, timeout(5000)).ownershipChanged(ownershipChange(entity, true, false, false));
 
         // Since the the shard has a local candidate registered, it should re-add its candidate to the entity.
 
         verifyCommittedEntityCandidate(shard, entity.getType(), entity.getId(), LOCAL_MEMBER_NAME);
-        verify(candidate, timeout(5000)).ownershipChanged(entity, false, true);
+        verify(listener, timeout(5000)).ownershipChanged(ownershipChange(entity, false, true, true));
 
         // Unregister the local candidate and verify it's removed and no re-added.
 
-        shard.tell(new UnregisterCandidateLocal(candidate, entity), kit.getRef());
+        shard.tell(new UnregisterCandidateLocal(entity), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         verifyNoEntityCandidate(shard, entity.getType(), entity.getId(), LOCAL_MEMBER_NAME);
@@ -679,7 +645,6 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         Entity entity3 = new Entity(ENTITY_TYPE, ENTITY_ID3);
         Entity entity4 = new Entity(otherEntityType, ENTITY_ID3);
         EntityOwnershipListener listener = mock(EntityOwnershipListener.class);
-        EntityOwnershipCandidate candidate = mock(EntityOwnershipCandidate.class);
 
         // Register listener
 
@@ -688,24 +653,24 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         // Register a couple candidates for the desired entity type and verify listener is notified.
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity1), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity1), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
-        verify(listener, timeout(5000)).ownershipChanged(entity1, false, true);
+        verify(listener, timeout(5000)).ownershipChanged(ownershipChange(entity1, false, true, true));
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity2), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity2), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
-        verify(listener, timeout(5000)).ownershipChanged(entity2, false, true);
+        verify(listener, timeout(5000)).ownershipChanged(ownershipChange(entity2, false, true, true));
         reset(listener);
 
         // Register another candidate for another entity type and verify listener is not notified.
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity4), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity4), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS);
-        verify(listener, never()).ownershipChanged(eq(entity4), anyBoolean(), anyBoolean());
+        verify(listener, never()).ownershipChanged(ownershipChange(entity4));
 
         // Register remote candidate for entity1
 
@@ -716,10 +681,10 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         // Unregister the local candidate for entity1 and verify listener is notified
 
-        shard.tell(new UnregisterCandidateLocal(candidate, entity1), kit.getRef());
+        shard.tell(new UnregisterCandidateLocal(entity1), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
-        verify(listener, timeout(5000)).ownershipChanged(entity1, true, false);
+        verify(listener, timeout(5000)).ownershipChanged(ownershipChange(entity1, true, false, true));
         reset(listener);
 
         // Unregister the listener, add a candidate for entity3 and verify listener isn't notified
@@ -727,30 +692,28 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         shard.tell(new UnregisterListenerLocal(listener, ENTITY_TYPE), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
-        shard.tell(new RegisterCandidateLocal(candidate, entity3), kit.getRef());
+        shard.tell(new RegisterCandidateLocal(entity3), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
         verifyOwner(shard, ENTITY_TYPE, entity3.getId(), LOCAL_MEMBER_NAME);
         Uninterruptibles.sleepUninterruptibly(500, TimeUnit.MILLISECONDS);
-        verify(listener, never()).ownershipChanged(any(Entity.class), anyBoolean(), anyBoolean());
+        verify(listener, never()).ownershipChanged(any(EntityOwnershipChange.class));
 
-        // Re-register the listener and verify it gets notified of current locally owned entities
+        // Re-register the listener and verify it gets notified of currently owned entities
 
-        reset(listener, candidate);
+        reset(listener);
 
         shard.tell(new RegisterListenerLocal(listener, ENTITY_TYPE), kit.getRef());
         kit.expectMsgClass(SuccessReply.class);
 
-        Matcher<Entity> entityMatcher = either(equalTo(entity2)).or(equalTo(entity3));
-        verify(listener, timeout(5000).times(2)).ownershipChanged(argThat(entityMatcher), eq(false), eq(true));
+        verify(listener, timeout(5000).times(2)).ownershipChanged(or(ownershipChange(entity2, false, true, true),
+                ownershipChange(entity3, false, true, true)));
         Uninterruptibles.sleepUninterruptibly(300, TimeUnit.MILLISECONDS);
-        verify(listener, never()).ownershipChanged(eq(entity4), anyBoolean(), anyBoolean());
-        verify(listener, never()).ownershipChanged(eq(entity1), anyBoolean(), anyBoolean());
-        verify(candidate, never()).ownershipChanged(eq(entity2), anyBoolean(), anyBoolean());
-        verify(candidate, never()).ownershipChanged(eq(entity3), anyBoolean(), anyBoolean());
+        verify(listener, never()).ownershipChanged(ownershipChange(entity4));
+        verify(listener, never()).ownershipChanged(ownershipChange(entity1));
     }
 
-    private void commitModification(TestActorRef<EntityOwnershipShard> shard, NormalizedNode<?, ?> node,
+    private static void commitModification(TestActorRef<EntityOwnershipShard> shard, NormalizedNode<?, ?> node,
             JavaTestKit sender) {
         BatchedModifications modifications = newBatchedModifications();
         modifications.addModification(new MergeModification(ENTITY_OWNERS_PATH, node));
@@ -759,7 +722,7 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         sender.expectMsgClass(CommitTransactionReply.SERIALIZABLE_CLASS);
     }
 
-    private BatchedModifications newBatchedModifications() {
+    private static BatchedModifications newBatchedModifications() {
         BatchedModifications modifications = new BatchedModifications("tnx", DataStoreVersions.CURRENT_VERSION, "");
         modifications.setDoCommitOnReady(true);
         modifications.setReady(true);
@@ -823,8 +786,8 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
                 entityId, candidateName, true);
     }
 
-    private void verifyOwner(final TestActorRef<EntityOwnershipShard> shard, String entityType, YangInstanceIdentifier entityId,
-            String localMemberName) {
+    private static void verifyOwner(final TestActorRef<EntityOwnershipShard> shard, String entityType,
+            YangInstanceIdentifier entityId, String localMemberName) {
         verifyOwner(localMemberName, entityType, entityId, new Function<YangInstanceIdentifier, NormalizedNode<?,?>>() {
             @Override
             public NormalizedNode<?, ?> apply(YangInstanceIdentifier path) {
@@ -841,16 +804,23 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         return newShardProps(Collections.<String,String>emptyMap());
     }
 
+    private Props newShardProps(EntityOwnerSelectionStrategyConfig strategyConfig) {
+        return newShardProps(newShardId(LOCAL_MEMBER_NAME), Collections.<String,String>emptyMap(),
+                LOCAL_MEMBER_NAME, strategyConfig);
+    }
+
     private Props newShardProps(Map<String,String> peers) {
-        return newShardProps(newShardId(LOCAL_MEMBER_NAME), peers, LOCAL_MEMBER_NAME);
+        return newShardProps(newShardId(LOCAL_MEMBER_NAME), peers, LOCAL_MEMBER_NAME, EntityOwnerSelectionStrategyConfig.newBuilder().build());
     }
 
-    private Props newShardProps(ShardIdentifier shardId, Map<String,String> peers, String memberName) {
-        return EntityOwnershipShard.props(shardId, peers, dataStoreContextBuilder.build(),
-                SCHEMA_CONTEXT, memberName);
+    private Props newShardProps(ShardIdentifier shardId, Map<String,String> peers, String memberName,
+                                EntityOwnerSelectionStrategyConfig config) {
+        return EntityOwnershipShard.newBuilder().id(shardId).peerAddresses(peers).
+                datastoreContext(dataStoreContextBuilder.build()).schemaContext(SCHEMA_CONTEXT).
+                localMemberName(memberName).ownerSelectionStrategyConfig(config).props().withDispatcher(Dispatchers.DefaultDispatcherId());
     }
 
-    private ShardIdentifier newShardId(String memberName) {
+    private static ShardIdentifier newShardId(String memberName) {
         return ShardIdentifier.builder().memberName(memberName).shardName("entity-ownership").
                 type("operational" + NEXT_SHARD_NUM.getAndIncrement()).build();
     }
@@ -859,7 +829,8 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
 
         TestEntityOwnershipShard(ShardIdentifier name, Map<String, String> peerAddresses,
                 DatastoreContext datastoreContext) {
-            super(name, peerAddresses, datastoreContext, SCHEMA_CONTEXT, LOCAL_MEMBER_NAME);
+            super(newBuilder().id(name).peerAddresses(peerAddresses).datastoreContext(datastoreContext).
+                    schemaContext(SCHEMA_CONTEXT).localMemberName(LOCAL_MEMBER_NAME));
         }
 
         @Override
@@ -909,6 +880,36 @@ public class EntityOwnershipShardTest extends AbstractEntityOwnershipTest {
         }
     }
 
+
+    @Test
+    public void testDelayedEntityOwnerSelection() throws Exception {
+        ShardTestKit kit = new ShardTestKit(getSystem());
+        EntityOwnerSelectionStrategyConfig.Builder builder
+                = EntityOwnerSelectionStrategyConfig.newBuilder().addStrategy(ENTITY_TYPE, LastCandidateSelectionStrategy.class, 500);
+        TestActorRef<EntityOwnershipShard> shard = actorFactory.createTestActor(newShardProps(builder.build()));
+        kit.waitUntilLeader(shard);
+
+        Entity entity = new Entity(ENTITY_TYPE, ENTITY_ID1);
+        ShardDataTree shardDataTree = shard.underlyingActor().getDataStore();
+
+        // Add a remote candidate
+
+        String remoteMemberName1 = "remoteMember1";
+        writeNode(ENTITY_OWNERS_PATH, entityOwnersWithCandidate(ENTITY_TYPE, ENTITY_ID1, remoteMemberName1), shardDataTree);
+
+
+        // Register local
+
+        shard.tell(new RegisterCandidateLocal(entity), kit.getRef());
+        kit.expectMsgClass(SuccessReply.class);
+
+        // Verify the local candidate becomes owner
+
+        verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, remoteMemberName1);
+        verifyCommittedEntityCandidate(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
+        verifyOwner(shard, ENTITY_TYPE, ENTITY_ID1, LOCAL_MEMBER_NAME);
+    }
+
     public static class MockLeader extends UntypedActor {
         volatile CountDownLatch modificationsReceived = new CountDownLatch(1);
         List<Modification> receivedModifications = new ArrayList<>();