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 akka.actor.ActorRef;
11 import akka.actor.ActorSelection;
12 import java.util.ArrayList;
13 import java.util.Collection;
14 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
15 import org.opendaylight.controller.cluster.datastore.messages.RegisterDataTreeChangeListener;
16 import org.opendaylight.controller.cluster.datastore.messages.RegisterDataTreeChangeListenerReply;
17 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
18 import org.opendaylight.yangtools.concepts.ListenerRegistration;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
22 final class DataTreeChangeListenerSupport extends LeaderLocalDelegateFactory<RegisterDataTreeChangeListener, ListenerRegistration<DOMDataTreeChangeListener>> {
23 private static final Logger LOG = LoggerFactory.getLogger(DataTreeChangeListenerSupport.class);
24 private final ArrayList<DelayedDataTreeListenerRegistration> delayedRegistrations = new ArrayList<>();
25 private final Collection<ActorSelection> actors = new ArrayList<>();
27 DataTreeChangeListenerSupport(final Shard shard) {
32 void onLeadershipChange(final boolean isLeader) {
34 for (DelayedDataTreeListenerRegistration reg : delayedRegistrations) {
35 reg.createDelegate(this);
37 delayedRegistrations.clear();
38 delayedRegistrations.trimToSize();
41 final EnableNotification msg = new EnableNotification(isLeader);
42 for (ActorSelection dataChangeListener : actors) {
43 dataChangeListener.tell(msg, getSelf());
48 void onMessage(final RegisterDataTreeChangeListener registerTreeChangeListener, final boolean isLeader) {
49 LOG.debug("{}: registerTreeChangeListener for {}, leader: {}", persistenceId(), registerTreeChangeListener.getPath(), isLeader);
51 final ListenerRegistration<DOMDataTreeChangeListener> registration;
53 LOG.debug("{}: Shard is not the leader - delaying registration", persistenceId());
55 DelayedDataTreeListenerRegistration delayedReg =
56 new DelayedDataTreeListenerRegistration(registerTreeChangeListener);
57 delayedRegistrations.add(delayedReg);
58 registration = delayedReg;
60 registration = createDelegate(registerTreeChangeListener);
63 ActorRef listenerRegistration = createActor(DataTreeChangeListenerRegistrationActor.props(registration));
65 LOG.debug("{}: registerDataChangeListener sending reply, listenerRegistrationPath = {} ",
66 persistenceId(), listenerRegistration.path());
68 tellSender(new RegisterDataTreeChangeListenerReply(listenerRegistration));
72 ListenerRegistration<DOMDataTreeChangeListener> createDelegate(final RegisterDataTreeChangeListener message) {
73 ActorSelection dataChangeListenerPath = selectActor(message.getDataTreeChangeListenerPath());
75 // Notify the listener if notifications should be enabled or not
76 // If this shard is the leader then it will enable notifications else
78 dataChangeListenerPath.tell(new EnableNotification(true), getSelf());
80 // Now store a reference to the data change listener so it can be notified
81 // at a later point if notifications should be enabled or disabled
82 actors.add(dataChangeListenerPath);
84 DOMDataTreeChangeListener listener = new ForwardingDataTreeChangeListener(dataChangeListenerPath);
86 LOG.debug("{}: Registering for path {}", persistenceId(), message.getPath());
88 return getShard().getDataStore().registerTreeChangeListener(message.getPath(), listener);