+/*
+ * Copyright (c) 2014, 2015 Cisco Systems, Inc. and others. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
package org.opendaylight.controller.cluster.example;
import akka.actor.ActorRef;
import akka.actor.Cancellable;
import akka.actor.Props;
+import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import scala.concurrent.duration.FiniteDuration;
/**
- * This is a sample implementation of a Role Change Listener which is an actor, which registers itself to the ClusterRoleChangeNotifier
- * <p/>
+ * This is a sample implementation of a Role Change Listener which is an actor, which registers itself
+ * to the ClusterRoleChangeNotifier.
+ *
+ * <p>
* The Role Change listener receives a SetNotifiers message with the notifiers to register itself with.
- * <p/>
- * It kicks of a scheduler which sents registration messages to the notifiers, till it gets a RegisterRoleChangeListenerReply
- * <p/>
+ *
+ * <p>
+ * It kicks of a scheduler which sends registration messages to the notifiers, till it gets a
+ * RegisterRoleChangeListenerReply.
+ *
+ * <p>
* If all the notifiers have been regsitered with, then it cancels the scheduler.
* It starts the scheduler again when it receives a new registration
- *
*/
-public class ExampleRoleChangeListener extends AbstractUntypedActor implements AutoCloseable{
+public class ExampleRoleChangeListener extends AbstractUntypedActor implements AutoCloseable {
// the akka url should be set to the notifiers actor-system and domain.
- private static final String NOTIFIER_AKKA_URL = "akka.tcp://raft-test@127.0.0.1:2550/user/";
+ private static final String NOTIFIER_AKKA_URL = "akka://raft-test@127.0.0.1:2550/user/";
- private Map<String, Boolean> notifierRegistrationStatus = new HashMap<>();
+ private final Map<String, Boolean> notifierRegistrationStatus = new HashMap<>();
private Cancellable registrationSchedule = null;
- private static final FiniteDuration duration = new FiniteDuration(100, TimeUnit.MILLISECONDS);
- private static final FiniteDuration schedulerDuration = new FiniteDuration(1, TimeUnit.SECONDS);
- private final String memberName;
- private static final String[] shardsToMonitor = new String[] {"example"};
-
- public ExampleRoleChangeListener(String memberName) {
- super();
- scheduleRegistrationListener(schedulerDuration);
- this.memberName = memberName;
+ private static final FiniteDuration DURATION = new FiniteDuration(100, TimeUnit.MILLISECONDS);
+ private static final FiniteDuration SCHEDULER_DURATION = new FiniteDuration(1, TimeUnit.SECONDS);
+ private static final String[] SHARDS_TO_MONITOR = new String[] {"example"};
+
+ public ExampleRoleChangeListener(final String memberName) {
+ scheduleRegistrationListener(SCHEDULER_DURATION);
populateRegistry(memberName);
}
}
@Override
- protected void handleReceive(Object message) throws Exception {
+ protected void handleReceive(final Object message) {
if (message instanceof RegisterListener) {
// called by the scheduler at intervals to register any unregistered notifiers
sendRegistrationRequests();
}
}
- private void scheduleRegistrationListener(FiniteDuration interval) {
+ private void scheduleRegistrationListener(final FiniteDuration interval) {
LOG.debug("--->scheduleRegistrationListener called.");
registrationSchedule = getContext().system().scheduler().schedule(
interval, interval, getSelf(), new RegisterListener(),
}
- private void populateRegistry(String memberName) {
-
- for (String shard: shardsToMonitor) {
- String notifier =(new StringBuilder()).append(NOTIFIER_AKKA_URL).append(memberName)
+ private void populateRegistry(final String memberName) {
+ String notifier = new StringBuilder().append(NOTIFIER_AKKA_URL).append(memberName)
.append("/").append(memberName).append("-notifier").toString();
- if (!notifierRegistrationStatus.containsKey(notifier)) {
- notifierRegistrationStatus.put(notifier, false);
- }
+ if (!notifierRegistrationStatus.containsKey(notifier)) {
+ notifierRegistrationStatus.put(notifier, false);
}
if (!registrationSchedule.isCancelled()) {
- scheduleRegistrationListener(schedulerDuration);
+ scheduleRegistrationListener(SCHEDULER_DURATION);
}
}
+ @SuppressWarnings("checkstyle:IllegalCatch")
+ @SuppressFBWarnings("REC_CATCH_EXCEPTION")
private void sendRegistrationRequests() {
for (Map.Entry<String, Boolean> entry : notifierRegistrationStatus.entrySet()) {
if (!entry.getValue()) {
try {
LOG.debug("{} registering with {}", getSelf().path().toString(), entry.getKey());
ActorRef notifier = Await.result(
- getContext().actorSelection(entry.getKey()).resolveOne(duration), duration);
+ getContext().actorSelection(entry.getKey()).resolveOne(DURATION), DURATION);
notifier.tell(new RegisterRoleChangeListener(), getSelf());
} catch (Exception e) {
- LOG.error("ERROR!! Unable to send registration request to notifier {}", entry.getKey());
+ LOG.error("ERROR!! Unable to send registration request to notifier {}", entry.getKey(), e);
}
}
}
}
- private void handleRegisterRoleChangeListenerReply(String senderId) {
+ private void handleRegisterRoleChangeListenerReply(final String senderId) {
if (notifierRegistrationStatus.containsKey(senderId)) {
notifierRegistrationStatus.put(senderId, true);
}
}
} else {
- LOG.info("Unexpected, RegisterRoleChangeListenerReply received from notifier which is not known to Listener:{}",
+ LOG.info(
+ "Unexpected, RegisterRoleChangeListenerReply received from notifier which is not known to Listener:{}",
senderId);
}
}
@Override
- public void close() throws Exception {
+ public void close() {
registrationSchedule.cancel();
}
}