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.List;
14 import java.util.Map.Entry;
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.AsyncDataChangeEvent;
19 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
20 import org.opendaylight.controller.md.sal.dom.store.impl.DOMImmutableDataChangeEvent;
21 import org.opendaylight.yangtools.concepts.ListenerRegistration;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
27 final class DataChangeListenerSupport extends LeaderLocalDelegateFactory<RegisterChangeListener, ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>, DOMImmutableDataChangeEvent> {
28 private static final Logger LOG = LoggerFactory.getLogger(DataChangeListenerSupport.class);
29 private final List<DelayedListenerRegistration> delayedListenerRegistrations = new ArrayList<>();
30 private final List<ActorSelection> dataChangeListeners = new ArrayList<>();
31 private final List<DelayedListenerRegistration> delayedRegisterOnAllListeners = new ArrayList<>();
33 DataChangeListenerSupport(final Shard shard) {
38 void onLeadershipChange(final boolean isLeader, boolean hasLeader) {
39 LOG.debug("onLeadershipChange, isLeader: {}, hasLeader : {}", isLeader, hasLeader);
41 for (ActorSelection dataChangeListener : dataChangeListeners) {
42 dataChangeListener.tell(new EnableNotification(isLeader), getSelf());
46 for (DelayedListenerRegistration reg : delayedRegisterOnAllListeners) {
47 registerDelayedListeners(reg);
49 delayedRegisterOnAllListeners.clear();
53 for (DelayedListenerRegistration reg: delayedListenerRegistrations) {
54 registerDelayedListeners(reg);
57 delayedListenerRegistrations.clear();
61 private void registerDelayedListeners(DelayedListenerRegistration reg) {
63 final Entry<ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>, DOMImmutableDataChangeEvent> res =
64 createDelegate(reg.getRegisterChangeListener());
65 reg.setDelegate(res.getKey());
66 if (res.getValue() != null) {
67 reg.getInstance().onDataChanged(res.getValue());
73 void onMessage(final RegisterChangeListener message, final boolean isLeader, boolean hasLeader) {
75 LOG.debug("{}: registerDataChangeListener for {}, isLeader: {}, hasLeader : {}",
76 persistenceId(), message.getPath(), isLeader, hasLeader);
78 final ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
79 NormalizedNode<?, ?>>> registration;
80 final AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> event;
81 if ((hasLeader && message.isRegisterOnAllInstances()) || isLeader) {
82 final Entry<ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>, DOMImmutableDataChangeEvent> res =
83 createDelegate(message);
84 registration = res.getKey();
85 event = res.getValue();
87 LOG.debug("{}: Shard is not the leader - delaying registration", persistenceId());
89 DelayedListenerRegistration delayedReg = new DelayedListenerRegistration(message);
90 if(message.isRegisterOnAllInstances()) {
91 delayedRegisterOnAllListeners.add(delayedReg);
93 delayedListenerRegistrations.add(delayedReg);
95 registration = delayedReg;
99 ActorRef listenerRegistration = createActor(DataChangeListenerRegistration.props(registration));
101 LOG.debug("{}: registerDataChangeListener sending reply, listenerRegistrationPath = {} ",
102 persistenceId(), listenerRegistration.path());
104 tellSender(new RegisterChangeListenerReply(listenerRegistration));
106 registration.getInstance().onDataChanged(event);
111 Entry<ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>, DOMImmutableDataChangeEvent> createDelegate(
112 final RegisterChangeListener message) {
113 ActorSelection dataChangeListenerPath = selectActor(message.getDataChangeListenerPath());
115 // Notify the listener if notifications should be enabled or not
116 // If this shard is the leader then it will enable notifications else
118 dataChangeListenerPath.tell(new EnableNotification(true), getSelf());
120 // Now store a reference to the data change listener so it can be notified
121 // at a later point if notifications should be enabled or disabled
122 if(!message.isRegisterOnAllInstances()) {
123 dataChangeListeners.add(dataChangeListenerPath);
126 AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener =
127 new DataChangeListenerProxy(dataChangeListenerPath);
129 LOG.debug("{}: Registering for path {}", persistenceId(), message.getPath());
131 return getShard().getDataStore().registerChangeListener(message.getPath(), listener,