opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/ForwardingDataTreeChangeListener.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 static java.util.Objects.requireNonNull;
  11
  12 import akka.actor.ActorRef;
  13 import akka.actor.ActorSelection;
  14 import java.util.List;
  15 import org.eclipse.jdt.annotation.Nullable;
  16 import org.opendaylight.controller.cluster.datastore.messages.DataTreeChanged;
  17 import org.opendaylight.controller.cluster.datastore.messages.OnInitialData;
  18 import org.opendaylight.mdsal.dom.api.DOMDataTreeChangeListener;
  19 import org.opendaylight.yangtools.yang.data.tree.api.DataTreeCandidate;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 /**
  24  * Internal implementation of a {@link DOMDataTreeChangeListener} which
  25  * encapsulates received notifications into a {@link DataTreeChanged}
  26  * message and forwards them towards the client's {@link DataTreeChangeListenerActor}.
  27  */
  28 final class ForwardingDataTreeChangeListener implements DOMDataTreeChangeListener {
  29     private static final Logger LOG = LoggerFactory.getLogger(ForwardingDataTreeChangeListener.class);
  30
  31     private final ActorSelection actor;
  32     private final ActorRef sendingActor;
  33
  34     ForwardingDataTreeChangeListener(final ActorSelection actor, @Nullable final ActorRef sendingActor) {
  35         this.actor = requireNonNull(actor, "actor should not be null");
  36         this.sendingActor = sendingActor;
  37     }
  38
  39     @Override
  40     public void onDataTreeChanged(final List<DataTreeCandidate> changes) {
  41         LOG.debug("Sending DataTreeChanged to {}", actor);
  42         actor.tell(new DataTreeChanged(changes), sendingActor);
  43     }
  44
  45     @Override
  46     public void onInitialData() {
  47         LOG.debug("Sending OnInitialData to {}", actor);
  48         actor.tell(OnInitialData.INSTANCE, sendingActor);
  49     }
  50
  51     @Override
  52     public String toString() {
  53         return "ForwardingDataTreeChangeListener [actor=" + actor
  54             + ", sending actor=" + (sendingActor != null ? sendingActor : "NO_SENDER") + "]";
  55     }
  56 }