opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DataChangeListenerSupport.java

   1 /*
   2  * Copyright (c) 2015 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 package org.opendaylight.controller.cluster.datastore;
   9
  10 import akka.actor.ActorRef;
  11 import akka.actor.ActorSelection;
  12 import com.google.common.base.Optional;
  13 import java.util.Map.Entry;
  14 import org.opendaylight.controller.cluster.datastore.messages.EnableNotification;
  15 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
  16 import org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListenerReply;
  17 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
  18 import org.opendaylight.controller.md.sal.dom.store.impl.DataChangeListenerRegistration;
  19 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  20 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  21 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  22 import org.opendaylight.yangtools.yang.data.api.schema.tree.DataTreeCandidate;
  23
  24 final class DataChangeListenerSupport extends AbstractDataListenerSupport<
  25         AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>, RegisterChangeListener,
  26             DelayedDataChangeListenerRegistration, DataChangeListenerRegistration<
  27                     AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>> {
  28
  29     DataChangeListenerSupport(final Shard shard) {
  30         super(shard);
  31     }
  32
  33     @Override
  34     Entry<DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>,
  35             Optional<DataTreeCandidate>> createDelegate(final RegisterChangeListener message) {
  36         ActorSelection dataChangeListenerPath = selectActor(message.getDataChangeListenerPath());
  37
  38         // Notify the listener if notifications should be enabled or not
  39         // If this shard is the leader then it will enable notifications else
  40         // it will not
  41         dataChangeListenerPath.tell(new EnableNotification(true), getSelf());
  42
  43         // Now store a reference to the data change listener so it can be notified
  44         // at a later point if notifications should be enabled or disabled
  45         if (!message.isRegisterOnAllInstances()) {
  46             addListenerActor(dataChangeListenerPath);
  47         }
  48
  49         AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> listener =
  50                 new DataChangeListenerProxy(dataChangeListenerPath);
  51
  52         log().debug("{}: Registering for path {}", persistenceId(), message.getPath());
  53
  54         Entry<DataChangeListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>>,
  55                 Optional<DataTreeCandidate>> regEntry = getShard().getDataStore().registerChangeListener(
  56                         message.getPath(), listener, message.getScope());
  57
  58         getShard().getDataStore().notifyOfInitialData(regEntry.getKey(), regEntry.getValue());
  59
  60         return regEntry;
  61     }
  62
  63     @Override
  64     protected DelayedDataChangeListenerRegistration newDelayedListenerRegistration(RegisterChangeListener message) {
  65         return new DelayedDataChangeListenerRegistration(message);
  66     }
  67
  68     @Override
  69     protected ActorRef newRegistrationActor(
  70             ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> registration) {
  71         return createActor(DataChangeListenerRegistrationActor.props(registration));
  72     }
  73
  74     @Override
  75     protected Object newRegistrationReplyMessage(ActorRef registrationActor) {
  76         return new RegisterChangeListenerReply(registrationActor);
  77     }
  78
  79     @Override
  80     protected String logName() {
  81         return "registerDataChangeListener";
  82     }
  83 }