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