2 * Copyright (c) 2015 Brocade Communications 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 java.util.EventListener;
15 import java.util.concurrent.ConcurrentHashMap;
16 import org.opendaylight.controller.cluster.datastore.actors.DataTreeNotificationListenerRegistrationActor;
17 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
18 import org.opendaylight.controller.cluster.datastore.messages.ListenerRegistrationMessage;
19 import org.slf4j.Logger;
20 import org.slf4j.LoggerFactory;
22 abstract class AbstractDataListenerSupport<L extends EventListener, M extends ListenerRegistrationMessage>
23 extends LeaderLocalDelegateFactory<M> {
24 private final Logger log = LoggerFactory.getLogger(getClass());
26 private final Collection<DelayedListenerRegistration<L, M>> delayedListenerRegistrations =
27 ConcurrentHashMap.newKeySet();
28 private final Collection<DelayedListenerRegistration<L, M>> delayedListenerOnAllRegistrations =
29 ConcurrentHashMap.newKeySet();
30 private final Collection<ActorSelection> leaderOnlyListenerActors = ConcurrentHashMap.newKeySet();
31 private final Collection<ActorSelection> allListenerActors = ConcurrentHashMap.newKeySet();
33 protected AbstractDataListenerSupport(Shard shard) {
37 Collection<ActorSelection> getListenerActors() {
38 return new ArrayList<>(allListenerActors);
42 void onLeadershipChange(boolean isLeader, boolean hasLeader) {
43 log.debug("{}: onLeadershipChange, isLeader: {}, hasLeader : {}", persistenceId(), isLeader, hasLeader);
45 final EnableNotification msg = new EnableNotification(isLeader, persistenceId());
46 for (ActorSelection dataChangeListener : leaderOnlyListenerActors) {
47 dataChangeListener.tell(msg, getSelf());
51 for (DelayedListenerRegistration<L, M> reg : delayedListenerOnAllRegistrations) {
52 reg.doRegistration(this);
55 delayedListenerOnAllRegistrations.clear();
59 for (DelayedListenerRegistration<L, M> reg : delayedListenerRegistrations) {
60 reg.doRegistration(this);
63 delayedListenerRegistrations.clear();
68 void onMessage(M message, boolean isLeader, boolean hasLeader) {
69 log.debug("{}: {} for {}, isLeader: {}, hasLeader: {}", persistenceId(), logName(), message,
72 ActorRef registrationActor = createActor(DataTreeNotificationListenerRegistrationActor.props());
74 if (hasLeader && message.isRegisterOnAllInstances() || isLeader) {
75 doRegistration(message, registrationActor);
77 log.debug("{}: Shard is not the leader - delaying registration", persistenceId());
79 DelayedListenerRegistration<L, M> delayedReg =
80 new DelayedListenerRegistration<>(message, registrationActor);
81 Collection<DelayedListenerRegistration<L, M>> delayedRegList;
82 if (message.isRegisterOnAllInstances()) {
83 delayedRegList = delayedListenerOnAllRegistrations;
85 delayedRegList = delayedListenerRegistrations;
88 delayedRegList.add(delayedReg);
89 registrationActor.tell(new DataTreeNotificationListenerRegistrationActor.SetRegistration(
90 delayedReg, () -> delayedRegList.remove(delayedReg)), ActorRef.noSender());
93 log.debug("{}: {} sending reply, listenerRegistrationPath = {} ", persistenceId(), logName(),
94 registrationActor.path());
96 tellSender(newRegistrationReplyMessage(registrationActor));
99 protected ActorSelection processListenerRegistrationMessage(M message) {
100 final ActorSelection listenerActor = selectActor(message.getListenerActorPath());
102 // We have a leader so enable the listener.
103 listenerActor.tell(new EnableNotification(true, persistenceId()), getSelf());
105 if (!message.isRegisterOnAllInstances()) {
106 // This is a leader-only registration so store a reference to the listener actor so it can be notified
107 // at a later point if notifications should be enabled or disabled.
108 leaderOnlyListenerActors.add(listenerActor);
111 allListenerActors.add(listenerActor);
113 return listenerActor;
116 protected Logger log() {
120 protected void removeListenerActor(ActorSelection listenerActor) {
121 allListenerActors.remove(listenerActor);
122 leaderOnlyListenerActors.remove(listenerActor);
125 abstract void doRegistration(M message, ActorRef registrationActor);
127 protected abstract Object newRegistrationReplyMessage(ActorRef registrationActor);
129 protected abstract String logName();