2 * Copyright (c) 2015 Cisco Systems, Inc. and others. All rights reserved.
4 * This program and the accompanying materials are made available under the
5 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
6 * and is available at http://www.eclipse.org/legal/epl-v10.html
8 package org.opendaylight.controller.cluster.datastore;
10 import com.google.common.base.Preconditions;
11 import java.util.ArrayList;
12 import java.util.List;
13 import akka.actor.ActorRef;
14 import akka.actor.ActorSelection;
15 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
16 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
17 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListenerReply;
18 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
19 import org.opendaylight.yangtools.concepts.ListenerRegistration;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
22 import org.slf4j.Logger;
23 import org.slf4j.LoggerFactory;
25 final class DataChangeListenerSupport extends LeaderLocalDelegateFactory<RegisterChangeListener, ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>> {
26 private static final Logger LOG = LoggerFactory.getLogger(DataChangeListenerSupport.class);
27 private final List<DelayedListenerRegistration> delayedListenerRegistrations = new ArrayList<>();
28 private final List<ActorSelection> dataChangeListeners = new ArrayList<>();
29 private final Shard shard;
31 DataChangeListenerSupport(final Shard shard) {
32 this.shard = Preconditions.checkNotNull(shard);
36 void onLeadershipChange(final boolean isLeader) {
37 for (ActorSelection dataChangeListener : dataChangeListeners) {
38 dataChangeListener.tell(new EnableNotification(isLeader), shard.getSelf());
42 for (DelayedListenerRegistration reg: delayedListenerRegistrations) {
44 reg.setDelegate(createDelegate(reg.getRegisterChangeListener()));
48 delayedListenerRegistrations.clear();
53 void onMessage(final RegisterChangeListener message, final boolean isLeader) {
55 LOG.debug("{}: registerDataChangeListener for {}, leader: {}", shard.persistenceId(), message.getPath(), isLeader);
57 ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
58 NormalizedNode<?, ?>>> registration;
60 registration = createDelegate(message);
62 LOG.debug("{}: Shard is not the leader - delaying registration", shard.persistenceId());
64 DelayedListenerRegistration delayedReg = new DelayedListenerRegistration(message);
65 delayedListenerRegistrations.add(delayedReg);
66 registration = delayedReg;
69 ActorRef listenerRegistration = shard.getContext().actorOf(
70 DataChangeListenerRegistration.props(registration));
72 LOG.debug("{}: registerDataChangeListener sending reply, listenerRegistrationPath = {} ",
73 shard.persistenceId(), listenerRegistration.path());
75 shard.getSender().tell(new RegisterChangeListenerReply(listenerRegistration), shard.getSelf());
79 ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> createDelegate(
80 final RegisterChangeListener message) {
81 ActorSelection dataChangeListenerPath = shard.getContext().system().actorSelection(
82 message.getDataChangeListenerPath());
84 // Notify the listener if notifications should be enabled or not
85 // If this shard is the leader then it will enable notifications else
87 dataChangeListenerPath.tell(new EnableNotification(true), shard.getSelf());
89 // Now store a reference to the data change listener so it can be notified
90 // at a later point if notifications should be enabled or disabled
91 dataChangeListeners.add(dataChangeListenerPath);
93 AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener =
94 new DataChangeListenerProxy(dataChangeListenerPath);
96 LOG.debug("{}: Registering for path {}", shard.persistenceId(), message.getPath());
98 return shard.getDataStore().registerChangeListener(message.getPath(), listener,