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 org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
16 import org.opendaylight.controller.cluster.datastore.messages.ListenerRegistrationMessage;
17 import org.opendaylight.yangtools.concepts.ListenerRegistration;
18 import org.slf4j.Logger;
19 import org.slf4j.LoggerFactory;
21 abstract class AbstractDataListenerSupport<L extends EventListener, M extends ListenerRegistrationMessage,
22 D extends DelayedListenerRegistration<L, M>, R extends ListenerRegistration<L>>
23 extends LeaderLocalDelegateFactory<M, R> {
24 private final Logger log = LoggerFactory.getLogger(getClass());
26 private final ArrayList<D> delayedListenerRegistrations = new ArrayList<>();
27 private final ArrayList<D> delayedListenerOnAllRegistrations = new ArrayList<>();
28 private final Collection<ActorSelection> actors = new ArrayList<>();
30 protected AbstractDataListenerSupport(Shard shard) {
35 void onLeadershipChange(boolean isLeader, boolean hasLeader) {
36 log.debug("{}: onLeadershipChange, isLeader: {}, hasLeader : {}", persistenceId(), isLeader, hasLeader);
38 final EnableNotification msg = new EnableNotification(isLeader);
39 for (ActorSelection dataChangeListener : actors) {
40 dataChangeListener.tell(msg, getSelf());
44 for (D reg : delayedListenerOnAllRegistrations) {
45 reg.createDelegate(this);
48 delayedListenerOnAllRegistrations.clear();
49 delayedListenerOnAllRegistrations.trimToSize();
53 for (D reg : delayedListenerRegistrations) {
54 reg.createDelegate(this);
57 delayedListenerRegistrations.clear();
58 delayedListenerRegistrations.trimToSize();
63 void onMessage(M message, boolean isLeader, boolean hasLeader) {
64 log.debug("{}: {} for {}, leader: {}", persistenceId(), logName(), message.getPath(), isLeader);
66 final ListenerRegistration<L> registration;
67 if (hasLeader && message.isRegisterOnAllInstances() || isLeader) {
68 registration = createDelegate(message);
70 log.debug("{}: Shard is not the leader - delaying registration", persistenceId());
72 D delayedReg = newDelayedListenerRegistration(message);
73 if (message.isRegisterOnAllInstances()) {
74 delayedListenerOnAllRegistrations.add(delayedReg);
76 delayedListenerRegistrations.add(delayedReg);
79 registration = delayedReg;
82 ActorRef registrationActor = newRegistrationActor(registration);
84 log.debug("{}: {} sending reply, listenerRegistrationPath = {} ", persistenceId(), logName(),
85 registrationActor.path());
87 tellSender(newRegistrationReplyMessage(registrationActor));
90 protected Logger log() {
94 protected void addListenerActor(ActorSelection actor) {
98 protected abstract D newDelayedListenerRegistration(M message);
100 protected abstract ActorRef newRegistrationActor(ListenerRegistration<L> registration);
102 protected abstract Object newRegistrationReplyMessage(ActorRef registrationActor);
104 protected abstract String logName();