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.datastore;
11 import akka.actor.Props;
12 import akka.japi.Creator;
13 import com.google.common.base.Preconditions;
14 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor;
15 import org.opendaylight.controller.cluster.datastore.messages.DataChanged;
16 import org.opendaylight.controller.cluster.datastore.messages.DataChangedReply;
17 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
18 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
19 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
22 import org.slf4j.Logger;
23 import org.slf4j.LoggerFactory;
25 public class DataChangeListener extends AbstractUntypedActor {
26 private static final Logger LOG = LoggerFactory.getLogger(DataChangeListener.class);
28 private final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener;
29 private boolean notificationsEnabled = false;
31 public DataChangeListener(AsyncDataChangeListener<YangInstanceIdentifier,
32 NormalizedNode<?, ?>> listener) {
33 this.listener = Preconditions.checkNotNull(listener, "listener should not be null");
37 public void handleReceive(Object message) throws Exception {
38 if(message instanceof DataChanged){
40 } else if(message instanceof EnableNotification){
41 enableNotification((EnableNotification) message);
45 private void enableNotification(EnableNotification message) {
46 notificationsEnabled = message.isEnabled();
47 LOG.debug("{} notifications for listener {}", (notificationsEnabled ? "Enabled" : "Disabled"),
51 private void dataChanged(Object message) {
53 // Do nothing if notifications are not enabled
54 if(!notificationsEnabled) {
55 LOG.debug("Notifications not enabled for listener {} - dropping change notification",
60 DataChanged reply = (DataChanged) message;
61 AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change = reply.getChange();
63 LOG.debug("Sending change notification {} to listener {}", change, listener);
65 this.listener.onDataChanged(change);
67 // It seems the sender is never null but it doesn't hurt to check. If the caller passes in
68 // a null sender (ActorRef.noSender()), akka translates that to the deadLetters actor.
69 if(getSender() != null && !getContext().system().deadLetters().equals(getSender())) {
70 getSender().tell(new DataChangedReply(), getSelf());
74 public static Props props(final AsyncDataChangeListener<YangInstanceIdentifier,
75 NormalizedNode<?, ?>> listener) {
76 return Props.create(new DataChangeListenerCreator(listener));
79 private static class DataChangeListenerCreator implements Creator<DataChangeListener> {
80 private static final long serialVersionUID = 1L;
82 final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener;
84 DataChangeListenerCreator(
85 AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener) {
86 this.listener = listener;
90 public DataChangeListener create() throws Exception {
91 return new DataChangeListener(listener);