d572beb4d4d668dfc574599ea51cced32a27fd54
[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / DataChangeListener.java
1 /*
2  * Copyright (c) 2014 Cisco Systems, Inc. and others.  All rights reserved.
3  *
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
7  */
8
9 package org.opendaylight.controller.cluster.datastore;
10
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.binding.api.DataTreeChangeListener;
19 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeEvent;
20 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
21 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
22 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
23 import org.slf4j.Logger;
24 import org.slf4j.LoggerFactory;
25
26 /**
27  * @Deprecated Replaced by {@link DataTreeChangeListener}
28  */
29 @Deprecated
30 public class DataChangeListener extends AbstractUntypedActor {
31     private static final Logger LOG = LoggerFactory.getLogger(DataChangeListener.class);
32
33     private final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener;
34     private boolean notificationsEnabled = false;
35
36     public DataChangeListener(AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener) {
37         this.listener = Preconditions.checkNotNull(listener, "listener should not be null");
38     }
39
40     @Override
41     public void handleReceive(Object message) {
42         if (message instanceof DataChanged){
43             dataChanged(message);
44         } else if (message instanceof EnableNotification){
45             enableNotification((EnableNotification) message);
46         } else {
47             unknownMessage(message);
48         }
49     }
50
51     private void enableNotification(EnableNotification message) {
52         notificationsEnabled = message.isEnabled();
53         LOG.debug("{} notifications for listener {}", (notificationsEnabled ? "Enabled" : "Disabled"),
54                 listener);
55     }
56
57     private void dataChanged(Object message) {
58
59         // Do nothing if notifications are not enabled
60         if(!notificationsEnabled) {
61             LOG.debug("Notifications not enabled for listener {} - dropping change notification", listener);
62             return;
63         }
64
65         DataChanged reply = (DataChanged) message;
66         AsyncDataChangeEvent<YangInstanceIdentifier, NormalizedNode<?, ?>> change = reply.getChange();
67
68         LOG.debug("Sending change notification {} to listener {}", change, listener);
69
70         try {
71             this.listener.onDataChanged(change);
72         } catch (RuntimeException e) {
73             LOG.error( String.format( "Error notifying listener %s", this.listener ), e );
74         }
75
76         if(isValidSender(getSender())) {
77             getSender().tell(DataChangedReply.INSTANCE, getSelf());
78         }
79     }
80
81     public static Props props(final AsyncDataChangeListener<YangInstanceIdentifier,
82                                                             NormalizedNode<?, ?>> listener) {
83         return Props.create(new DataChangeListenerCreator(listener));
84     }
85
86     private static class DataChangeListenerCreator implements Creator<DataChangeListener> {
87         private static final long serialVersionUID = 1L;
88
89         final AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener;
90
91         DataChangeListenerCreator(
92                 AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener) {
93             this.listener = listener;
94         }
95
96         @Override
97         public DataChangeListener create() throws Exception {
98             return new DataChangeListener(listener);
99         }
100     }
101 }

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