2 * Copyright (c) 2014 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
9 package org.opendaylight.controller.cluster.notifications;
11 import akka.actor.ActorPath;
12 import akka.actor.ActorRef;
13 import akka.actor.Props;
14 import akka.serialization.Serialization;
15 import com.google.common.collect.Maps;
17 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor;
20 * The RoleChangeNotifier is responsible for receiving Raft role and leader state change messages and notifying
21 * the listeners (within the same node), which are registered with it.
24 * The RoleChangeNotifier is instantiated by the Shard and injected into the RaftActor.
26 public class RoleChangeNotifier extends AbstractUntypedActor implements AutoCloseable {
28 private final String memberId;
29 private final Map<ActorPath, ActorRef> registeredListeners = Maps.newHashMap();
30 private RoleChangeNotification latestRoleChangeNotification = null;
31 private LeaderStateChanged latestLeaderStateChanged;
33 public RoleChangeNotifier(String memberId) {
34 this.memberId = memberId;
37 public static Props getProps(final String memberId) {
38 return Props.create(RoleChangeNotifier.class, memberId);
42 public void preStart() throws Exception {
44 LOG.info("RoleChangeNotifier:{} created and ready for shard:{}",
45 Serialization.serializedActorPath(getSelf()), memberId);
49 protected void handleReceive(Object message) {
50 if (message instanceof RegisterRoleChangeListener) {
51 // register listeners for this shard
53 ActorRef curRef = registeredListeners.get(getSender().path());
55 // ActorPaths would pass equal even if the unique id of the actors are different
56 // if a listener actor is re-registering after reincarnation, then removing the existing
57 // entry so the actor path with correct unique id is registered.
58 registeredListeners.remove(getSender().path());
60 registeredListeners.put(getSender().path(), getSender());
62 LOG.info("RoleChangeNotifier for {} , registered listener {}", memberId,
63 getSender().path().toString());
65 getSender().tell(new RegisterRoleChangeListenerReply(), getSelf());
67 if (latestLeaderStateChanged != null) {
68 getSender().tell(latestLeaderStateChanged, getSelf());
71 if (latestRoleChangeNotification != null) {
72 getSender().tell(latestRoleChangeNotification, getSelf());
76 } else if (message instanceof RoleChanged) {
77 // this message is sent by RaftActor. Notify registered listeners when this message is received.
78 RoleChanged roleChanged = (RoleChanged) message;
80 LOG.info("RoleChangeNotifier for {} , received role change from {} to {}", memberId,
81 roleChanged.getOldRole(), roleChanged.getNewRole());
83 latestRoleChangeNotification =
84 new RoleChangeNotification(roleChanged.getMemberId(),
85 roleChanged.getOldRole(), roleChanged.getNewRole());
87 for (ActorRef listener: registeredListeners.values()) {
88 listener.tell(latestRoleChangeNotification, getSelf());
90 } else if (message instanceof LeaderStateChanged) {
91 latestLeaderStateChanged = (LeaderStateChanged)message;
93 for (ActorRef listener: registeredListeners.values()) {
94 listener.tell(latestLeaderStateChanged, getSelf());
97 unknownMessage(message);
102 public void close() {
103 registeredListeners.clear();