opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/DelayedListenerRegistration.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 org.opendaylight.controller.cluster.datastore.messages.RegisterChangeListener;
  11 import org.opendaylight.controller.md.sal.common.api.data.AsyncDataChangeListener;
  12 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  13 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  14 import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
  15
  16 final class DelayedListenerRegistration implements
  17     ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>>> {
  18
  19     private volatile boolean closed;
  20
  21     private final RegisterChangeListener registerChangeListener;
  22
  23     private volatile ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
  24                                                          NormalizedNode<?, ?>>> delegate;
  25
  26     DelayedListenerRegistration(final RegisterChangeListener registerChangeListener) {
  27         this.registerChangeListener = registerChangeListener;
  28     }
  29
  30     void setDelegate( final ListenerRegistration<AsyncDataChangeListener<YangInstanceIdentifier,
  31                                         NormalizedNode<?, ?>>> registration) {
  32         this.delegate = registration;
  33     }
  34
  35     boolean isClosed() {
  36         return closed;
  37     }
  38
  39     RegisterChangeListener getRegisterChangeListener() {
  40         return registerChangeListener;
  41     }
  42
  43     @Override
  44     public AsyncDataChangeListener<YangInstanceIdentifier, NormalizedNode<?, ?>> getInstance() {
  45         return delegate != null ? delegate.getInstance() : null;
  46     }
  47
  48     @Override
  49     public void close() {
  50         closed = true;
  51         if(delegate != null) {
  52             delegate.close();
  53         }
  54     }
  55 }