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