2 * Copyright (c) 2015 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
8 package org.opendaylight.controller.cluster.datastore;
10 import akka.actor.Props;
11 import com.google.common.base.Preconditions;
12 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor;
13 import org.opendaylight.controller.cluster.datastore.messages.DataTreeChanged;
14 import org.opendaylight.controller.cluster.datastore.messages.DataTreeChangedReply;
15 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
16 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
17 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
18 import org.slf4j.Logger;
19 import org.slf4j.LoggerFactory;
22 * Proxy actor which acts as a facade to the user-provided listener. Responsible for decapsulating
23 * DataTreeChanged messages and dispatching their context to the user.
25 final class DataTreeChangeListenerActor extends AbstractUntypedActor {
26 private static final Logger LOG = LoggerFactory.getLogger(DataTreeChangeListenerActor.class);
27 private final DOMDataTreeChangeListener listener;
28 private final YangInstanceIdentifier registeredPath;
29 private boolean notificationsEnabled = false;
31 private DataTreeChangeListenerActor(final DOMDataTreeChangeListener listener,
32 final YangInstanceIdentifier registeredPath) {
33 this.listener = Preconditions.checkNotNull(listener);
34 this.registeredPath = Preconditions.checkNotNull(registeredPath);
38 protected void handleReceive(final Object message) {
39 if (message instanceof DataTreeChanged) {
40 dataChanged((DataTreeChanged)message);
41 } else if (message instanceof EnableNotification) {
42 enableNotification((EnableNotification) message);
44 unknownMessage(message);
48 private void dataChanged(final DataTreeChanged message) {
49 // Do nothing if notifications are not enabled
50 if (!notificationsEnabled) {
51 LOG.debug("Notifications not enabled for listener {} - dropping change notification", listener);
55 LOG.debug("Sending change notification {} to listener {}", message.getChanges(), listener);
58 this.listener.onDataTreeChanged(message.getChanges());
59 } catch (Exception e) {
60 LOG.error("Error notifying listener {}", this.listener, e);
63 // TODO: do we really need this?
64 // It seems the sender is never null but it doesn't hurt to check. If the caller passes in
65 // a null sender (ActorRef.noSender()), akka translates that to the deadLetters actor.
66 if (getSender() != null && !getContext().system().deadLetters().equals(getSender())) {
67 getSender().tell(DataTreeChangedReply.getInstance(), getSelf());
71 private void enableNotification(final EnableNotification message) {
72 notificationsEnabled = message.isEnabled();
73 LOG.debug("{} notifications for listener {}", (notificationsEnabled ? "Enabled" : "Disabled"),
77 public static Props props(final DOMDataTreeChangeListener listener, final YangInstanceIdentifier registeredPath) {
78 return Props.create(DataTreeChangeListenerActor.class, listener, registeredPath);