dom/mdsal-dom-broker/src/main/java/org/opendaylight/mdsal/dom/broker/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.mdsal.dom.broker;
   9
  10 import org.opendaylight.mdsal.dom.api.DOMNotification;
  11 import org.opendaylight.mdsal.dom.api.DOMNotificationListener;
  12
  13 import com.google.common.base.Preconditions;
  14 import com.google.common.util.concurrent.ListenableFuture;
  15 import com.google.common.util.concurrent.SettableFuture;
  16 import com.lmax.disruptor.EventFactory;
  17 import java.util.Collection;
  18 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  19
  20 /**
  21  * A single notification event in the disruptor ringbuffer. These objects are reused,
  22  * so they do have mutable state.
  23  */
  24 final class DOMNotificationRouterEvent {
  25     public static final EventFactory<DOMNotificationRouterEvent> FACTORY = new EventFactory<DOMNotificationRouterEvent>() {
  26         @Override
  27         public DOMNotificationRouterEvent newInstance() {
  28             return new DOMNotificationRouterEvent();
  29         }
  30     };
  31
  32     private Collection<ListenerRegistration<? extends DOMNotificationListener>> subscribers;
  33     private DOMNotification notification;
  34     private SettableFuture<Void> future;
  35
  36     private DOMNotificationRouterEvent() {
  37         // Hidden on purpose, initialized in initialize()
  38     }
  39
  40     ListenableFuture<Void> initialize(final DOMNotification notification, final Collection<ListenerRegistration<? extends DOMNotificationListener>> subscribers) {
  41         this.notification = Preconditions.checkNotNull(notification);
  42         this.subscribers = Preconditions.checkNotNull(subscribers);
  43         this.future = SettableFuture.create();
  44         return this.future;
  45     }
  46
  47     void deliverNotification() {
  48         for (ListenerRegistration<? extends DOMNotificationListener> r : subscribers) {
  49             final DOMNotificationListener l = r.getInstance();
  50             if (l != null) {
  51                 l.onNotification(notification);
  52             }
  53         }
  54     }
  55
  56     void setFuture() {
  57         future.set(null);
  58     }
  59
  60 }