opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DataTreeChangeListenerRegistrationActor.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.PoisonPill;
  11 import akka.actor.Props;
  12 import akka.japi.Creator;
  13 import com.google.common.base.Preconditions;
  14 import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor;
  15 import org.opendaylight.controller.cluster.datastore.messages.CloseDataTreeChangeListenerRegistration;
  16 import org.opendaylight.controller.cluster.datastore.messages.CloseDataTreeChangeListenerRegistrationReply;
  17 import org.opendaylight.controller.md.sal.dom.api.DOMDataTreeChangeListener;
  18 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  19
  20 /**
  21  * Actor co-located with a shard. It exists only to terminate the registration when
  22  * asked to do so via {@link CloseDataTreeChangeListenerRegistration}.
  23  */
  24 public final class DataTreeChangeListenerRegistrationActor extends AbstractUntypedActor {
  25     private final ListenerRegistration<DOMDataTreeChangeListener> registration;
  26
  27     public DataTreeChangeListenerRegistrationActor(final ListenerRegistration<DOMDataTreeChangeListener> registration) {
  28         this.registration = Preconditions.checkNotNull(registration);
  29     }
  30
  31     @Override
  32     protected void handleReceive(Object message) throws Exception {
  33         if (message instanceof CloseDataTreeChangeListenerRegistration) {
  34             registration.close();
  35             if (isValidSender(getSender())) {
  36                 getSender().tell(CloseDataTreeChangeListenerRegistrationReply.getInstance(), getSelf());
  37             }
  38
  39             getSelf().tell(PoisonPill.getInstance(), getSelf());
  40         } else {
  41             unknownMessage(message);
  42         }
  43     }
  44
  45     public static Props props(final ListenerRegistration<DOMDataTreeChangeListener> registration) {
  46         return Props.create(new DataTreeChangeListenerRegistrationCreator(registration));
  47     }
  48
  49     private static final class DataTreeChangeListenerRegistrationCreator
  50             implements Creator<DataTreeChangeListenerRegistrationActor> {
  51         private static final long serialVersionUID = 1L;
  52         final ListenerRegistration<DOMDataTreeChangeListener> registration;
  53
  54         DataTreeChangeListenerRegistrationCreator(ListenerRegistration<DOMDataTreeChangeListener> registration) {
  55             this.registration = Preconditions.checkNotNull(registration);
  56         }
  57
  58         @Override
  59         public DataTreeChangeListenerRegistrationActor create() {
  60             return new DataTreeChangeListenerRegistrationActor(registration);
  61         }
  62     }
  63 }