+ public DOMEntityOwnershipListenerRegistration registerListener(final String entityType,
+ final DOMEntityOwnershipListener listener) {
+ Preconditions.checkNotNull(entityType, "entityType cannot be null");
+ Preconditions.checkNotNull(listener, "listener cannot be null");
+
+ RegisterListenerLocal registerListener = new RegisterListenerLocal(listener, entityType);
+
+ LOG.debug("Registering listener with message: {}", registerListener);
+
+ executeLocalEntityOwnershipShardOperation(registerListener);
+ return new DistributedEntityOwnershipListenerRegistration(listener, entityType, this);
+ }
+
+ @Override
+ public Optional<EntityOwnershipState> getOwnershipState(final DOMEntity forEntity) {
+ Preconditions.checkNotNull(forEntity, "forEntity cannot be null");
+
+ DataTree dataTree = getLocalEntityOwnershipShardDataTree();
+ if (dataTree == null) {
+ return Optional.absent();
+ }
+
+ Optional<NormalizedNode<?, ?>> entityNode = dataTree.takeSnapshot().readNode(
+ entityPath(forEntity.getType(), forEntity.getIdentifier()));
+ if (!entityNode.isPresent()) {
+ return Optional.absent();
+ }
+
+ // Check if there are any candidates, if there are none we do not really have ownership state
+ final MapEntryNode entity = (MapEntryNode) entityNode.get();
+ final Optional<DataContainerChild<? extends PathArgument, ?>> optionalCandidates = entity.getChild(CANDIDATE_NODE_ID);
+ final boolean hasCandidates = optionalCandidates.isPresent() && ((MapNode) optionalCandidates.get()).getValue().size() > 0;
+ if(!hasCandidates){
+ return Optional.absent();
+ }
+
+ MemberName localMemberName = context.getCurrentMemberName();
+ Optional<DataContainerChild<? extends PathArgument, ?>> ownerLeaf = entity.getChild(ENTITY_OWNER_NODE_ID);
+ String owner = ownerLeaf.isPresent() ? ownerLeaf.get().getValue().toString() : null;
+ boolean hasOwner = !Strings.isNullOrEmpty(owner);
+ boolean isOwner = hasOwner && localMemberName.getName().equals(owner);
+
+ return Optional.of(EntityOwnershipState.from(isOwner, hasOwner));
+ }
+
+ @Override
+ public boolean isCandidateRegistered(@Nonnull final DOMEntity entity) {
+ return registeredEntities.get(entity) != null;
+ }
+
+ @VisibleForTesting
+ DataTree getLocalEntityOwnershipShardDataTree() {
+ if (localEntityOwnershipShardDataTree == null) {
+ try {
+ if(localEntityOwnershipShard == null) {
+ localEntityOwnershipShard = Await.result(context.findLocalShardAsync(
+ ENTITY_OWNERSHIP_SHARD_NAME), Duration.Inf());
+ }
+
+ localEntityOwnershipShardDataTree = (DataTree) Await.result(Patterns.ask(localEntityOwnershipShard,
+ GetShardDataTree.INSTANCE, MESSAGE_TIMEOUT), Duration.Inf());
+ } catch (Exception e) {
+ LOG.error("Failed to find local {} shard", ENTITY_OWNERSHIP_SHARD_NAME, e);
+ }
+ }
+
+ return localEntityOwnershipShardDataTree;
+ }
+
+ void unregisterListener(final String entityType, final DOMEntityOwnershipListener listener) {
+ LOG.debug("Unregistering listener {} for entity type {}", listener, entityType);
+
+ executeLocalEntityOwnershipShardOperation(new UnregisterListenerLocal(listener, entityType));