+/*
+ * Copyright (c) 2015 Brocade Communications 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.datastore;
+
+import akka.actor.ActorRef;
+import akka.actor.ActorSelection;
+import com.google.common.base.Optional;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.EventListener;
+import java.util.Map.Entry;
+import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
+import org.opendaylight.controller.cluster.datastore.messages.ListenerRegistrationMessage;
+import org.opendaylight.yangtools.concepts.ListenerRegistration;
+import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+abstract class AbstractDataListenerSupport<L extends EventListener, R extends ListenerRegistrationMessage,
+ D extends DelayedListenerRegistration<L, R>, LR extends ListenerRegistration<L>>
+ extends LeaderLocalDelegateFactory<R, LR, Optional<DataTreeCandidate>> {
+ private final Logger log = LoggerFactory.getLogger(getClass());
+
+ private final ArrayList<D> delayedListenerRegistrations = new ArrayList<>();
+ private final ArrayList<D> delayedListenerOnAllRegistrations = new ArrayList<>();
+ private final Collection<ActorSelection> actors = new ArrayList<>();
+
+ protected AbstractDataListenerSupport(Shard shard) {
+ super(shard);
+ }
+
+ @Override
+ void onLeadershipChange(boolean isLeader, boolean hasLeader) {
+ log.debug("{}: onLeadershipChange, isLeader: {}, hasLeader : {}", persistenceId(), isLeader, hasLeader);
+
+ final EnableNotification msg = new EnableNotification(isLeader);
+ for(ActorSelection dataChangeListener : actors) {
+ dataChangeListener.tell(msg, getSelf());
+ }
+
+ if(hasLeader) {
+ for(D reg : delayedListenerOnAllRegistrations) {
+ reg.createDelegate(this);
+ }
+
+ delayedListenerOnAllRegistrations.clear();
+ delayedListenerOnAllRegistrations.trimToSize();
+ }
+
+ if(isLeader) {
+ for(D reg : delayedListenerRegistrations) {
+ reg.createDelegate(this);
+ }
+
+ delayedListenerRegistrations.clear();
+ delayedListenerRegistrations.trimToSize();
+ }
+ }
+
+ @Override
+ void onMessage(R message, boolean isLeader, boolean hasLeader) {
+ log.debug("{}: {} for {}, leader: {}", persistenceId(), logName(), message.getPath(), isLeader);
+
+ final ListenerRegistration<L> registration;
+ if((hasLeader && message.isRegisterOnAllInstances()) || isLeader) {
+ final Entry<LR, Optional<DataTreeCandidate>> res = createDelegate(message);
+ registration = res.getKey();
+ } else {
+ log.debug("{}: Shard is not the leader - delaying registration", persistenceId());
+
+ D delayedReg = newDelayedListenerRegistration(message);
+ if(message.isRegisterOnAllInstances()) {
+ delayedListenerOnAllRegistrations.add(delayedReg);
+ } else {
+ delayedListenerRegistrations.add(delayedReg);
+ }
+
+ registration = delayedReg;
+ }
+
+ ActorRef registrationActor = newRegistrationActor(registration);
+
+ log.debug("{}: {} sending reply, listenerRegistrationPath = {} ", persistenceId(), logName(),
+ registrationActor.path());
+
+ tellSender(newRegistrationReplyMessage(registrationActor));
+ }
+
+ protected Logger log() {
+ return log;
+ }
+
+ protected void addListenerActor(ActorSelection actor) {
+ actors.add(actor);
+ }
+
+ protected abstract D newDelayedListenerRegistration(R message);
+
+ protected abstract ActorRef newRegistrationActor(ListenerRegistration<L> registration);
+
+ protected abstract Object newRegistrationReplyMessage(ActorRef registrationActor);
+
+ protected abstract String logName();
+}
Code Review / controller.git / commitdiff