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.ActorRef;
11 import akka.actor.ActorSelection;
12 import com.google.common.base.Optional;
13 import java.util.ArrayList;
14 import java.util.List;
15 import java.util.Map.Entry;
16 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
17 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
18 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListenerReply;
19 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
20 import org.opendaylight.controller.md.sal.dom.store.impl.DataChangeListenerRegistration;
21 import org.opendaylight.yangtools.concepts.ListenerRegistration;
22 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
23 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
24 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
25 import org.slf4j.Logger;
26 import org.slf4j.LoggerFactory;
28 final class DataChangeListenerSupport extends LeaderLocalDelegateFactory<RegisterChangeListener,
29 DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>,
30 Optional<DataTreeCandidate>> {
31 private static final Logger LOG = LoggerFactory.getLogger(DataChangeListenerSupport.class);
32 private final List<DelayedListenerRegistration> delayedListenerRegistrations = new ArrayList<>();
33 private final List<ActorSelection> dataChangeListeners = new ArrayList<>();
34 private final List<DelayedListenerRegistration> delayedRegisterOnAllListeners = new ArrayList<>();
36 DataChangeListenerSupport(final Shard shard) {
41 void onLeadershipChange(final boolean isLeader, boolean hasLeader) {
42 LOG.debug("onLeadershipChange, isLeader: {}, hasLeader : {}", isLeader, hasLeader);
44 for (ActorSelection dataChangeListener : dataChangeListeners) {
45 dataChangeListener.tell(new EnableNotification(isLeader), getSelf());
49 for (DelayedListenerRegistration reg : delayedRegisterOnAllListeners) {
50 registerDelayedListeners(reg);
52 delayedRegisterOnAllListeners.clear();
56 for (DelayedListenerRegistration reg: delayedListenerRegistrations) {
57 registerDelayedListeners(reg);
60 delayedListenerRegistrations.clear();
64 private void registerDelayedListeners(DelayedListenerRegistration reg) {
66 final Entry<DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>,
67 Optional<DataTreeCandidate>> res = createDelegate(reg.getRegisterChangeListener());
68 reg.setDelegate(res.getKey());
69 getShard().getDataStore().notifyOfInitialData(res.getKey(), res.getValue());
74 void onMessage(final RegisterChangeListener message, final boolean isLeader, boolean hasLeader) {
76 LOG.debug("{}: registerDataChangeListener for {}, isLeader: {}, hasLeader : {}",
77 persistenceId(), message.getPath(), isLeader, hasLeader);
79 final ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
80 NormalizedNode<?, ?>>> registration;
81 if ((hasLeader && message.isRegisterOnAllInstances()) || isLeader) {
82 final Entry<DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>,
83 Optional<DataTreeCandidate>> res = createDelegate(message);
84 registration = res.getKey();
86 getShard().getDataStore().notifyOfInitialData(res.getKey(), res.getValue());
88 LOG.debug("{}: Shard is not the leader - delaying registration", persistenceId());
90 DelayedListenerRegistration delayedReg = new DelayedListenerRegistration(message);
91 if(message.isRegisterOnAllInstances()) {
92 delayedRegisterOnAllListeners.add(delayedReg);
94 delayedListenerRegistrations.add(delayedReg);
96 registration = delayedReg;
99 ActorRef listenerRegistration = createActor(DataChangeListenerRegistrationActor.props(registration));
101 LOG.debug("{}: registerDataChangeListener sending reply, listenerRegistrationPath = {} ",
102 persistenceId(), listenerRegistration.path());
104 tellSender(new RegisterChangeListenerReply(listenerRegistration));
108 Entry<DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>,
109 Optional<DataTreeCandidate>> createDelegate(final RegisterChangeListener message) {
110 ActorSelection dataChangeListenerPath = selectActor(message.getDataChangeListenerPath());
112 // Notify the listener if notifications should be enabled or not
113 // If this shard is the leader then it will enable notifications else
115 dataChangeListenerPath.tell(new EnableNotification(true), getSelf());
117 // Now store a reference to the data change listener so it can be notified
118 // at a later point if notifications should be enabled or disabled
119 if(!message.isRegisterOnAllInstances()) {
120 dataChangeListeners.add(dataChangeListenerPath);
123 AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener =
124 new DataChangeListenerProxy(dataChangeListenerPath);
126 LOG.debug("{}: Registering for path {}", persistenceId(), message.getPath());
128 return getShard().getDataStore().registerChangeListener(message.getPath(), listener,