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 java.util.ArrayList;
11 import java.util.List;
12 import akka.actor.ActorRef;
13 import akka.actor.ActorSelection;
14 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
15 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
16 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListenerReply;
17 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
18 import org.opendaylight.yangtools.concepts.ListenerRegistration;
19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
20 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
21 import org.slf4j.Logger;
22 import org.slf4j.LoggerFactory;
24 final class DataChangeListenerSupport extends LeaderLocalDelegateFactory<RegisterChangeListener, ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>> {
25 private static final Logger LOG = LoggerFactory.getLogger(DataChangeListenerSupport.class);
26 private final List<DelayedListenerRegistration> delayedListenerRegistrations = new ArrayList<>();
27 private final List<ActorSelection> dataChangeListeners = new ArrayList<>();
29 DataChangeListenerSupport(final Shard shard) {
34 void onLeadershipChange(final boolean isLeader) {
35 for (ActorSelection dataChangeListener : dataChangeListeners) {
36 dataChangeListener.tell(new EnableNotification(isLeader), getSelf());
40 for (DelayedListenerRegistration reg: delayedListenerRegistrations) {
42 reg.setDelegate(createDelegate(reg.getRegisterChangeListener()));
46 delayedListenerRegistrations.clear();
51 void onMessage(final RegisterChangeListener message, final boolean isLeader) {
53 LOG.debug("{}: registerDataChangeListener for {}, leader: {}", persistenceId(), message.getPath(), isLeader);
55 ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
56 NormalizedNode<?, ?>>> registration;
58 registration = createDelegate(message);
60 LOG.debug("{}: Shard is not the leader - delaying registration", persistenceId());
62 DelayedListenerRegistration delayedReg = new DelayedListenerRegistration(message);
63 delayedListenerRegistrations.add(delayedReg);
64 registration = delayedReg;
67 ActorRef listenerRegistration = createActor(DataChangeListenerRegistration.props(registration));
69 LOG.debug("{}: registerDataChangeListener sending reply, listenerRegistrationPath = {} ",
70 persistenceId(), listenerRegistration.path());
72 tellSender(new RegisterChangeListenerReply(listenerRegistration));
76 ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> createDelegate(
77 final RegisterChangeListener message) {
78 ActorSelection dataChangeListenerPath = selectActor(message.getDataChangeListenerPath());
80 // Notify the listener if notifications should be enabled or not
81 // If this shard is the leader then it will enable notifications else
83 dataChangeListenerPath.tell(new EnableNotification(true), getSelf());
85 // Now store a reference to the data change listener so it can be notified
86 // at a later point if notifications should be enabled or disabled
87 dataChangeListeners.add(dataChangeListenerPath);
89 AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener =
90 new DataChangeListenerProxy(dataChangeListenerPath);
92 LOG.debug("{}: Registering for path {}", persistenceId(), message.getPath());
94 return getShard().getDataStore().registerChangeListener(message.getPath(), listener,