opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/broker/impl/DOMNotificationRouterEvent.java

   1 /*
   2  * Copyright (c) 2014 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.md.sal.dom.broker.impl;
   9
  10 import com.google.common.base.Preconditions;
  11 import com.google.common.util.concurrent.ListenableFuture;
  12 import com.google.common.util.concurrent.SettableFuture;
  13 import com.lmax.disruptor.EventFactory;
  14 import java.util.Collection;
  15 import org.opendaylight.controller.md.sal.dom.api.DOMNotification;
  16 import org.opendaylight.controller.md.sal.dom.api.DOMNotificationListener;
  17 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  18
  19 /**
  20  * A single notification event in the disruptor ringbuffer. These objects are reused,
  21  * so they do have mutable state.
  22  */
  23 final class DOMNotificationRouterEvent {
  24     public static final EventFactory<DOMNotificationRouterEvent> FACTORY = new EventFactory<DOMNotificationRouterEvent>() {
  25         @Override
  26         public DOMNotificationRouterEvent newInstance() {
  27             return new DOMNotificationRouterEvent();
  28         }
  29     };
  30
  31     private Collection<ListenerRegistration<? extends DOMNotificationListener>> subscribers;
  32     private DOMNotification notification;
  33     private SettableFuture<Void> future;
  34
  35     private DOMNotificationRouterEvent() {
  36         // Hidden on purpose, initialized in initialize()
  37     }
  38
  39     ListenableFuture<Void> initialize(final DOMNotification notification, final Collection<ListenerRegistration<? extends DOMNotificationListener>> subscribers) {
  40         this.notification = Preconditions.checkNotNull(notification);
  41         this.subscribers = Preconditions.checkNotNull(subscribers);
  42         this.future = SettableFuture.create();
  43         return this.future;
  44     }
  45
  46     void deliverNotification() {
  47         for (ListenerRegistration<? extends DOMNotificationListener> r : subscribers) {
  48             final DOMNotificationListener l = r.getInstance();
  49             if (l != null) {
  50                 l.onNotification(notification);
  51             }
  52         }
  53     }
  54
  55     void setFuture() {
  56         future.set(null);
  57     }
  58
  59 }