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 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.mdsal.dom.api.DOMNotification;
  16 import org.opendaylight.mdsal.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 =
  25             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,
  41             final Collection<ListenerRegistration<? extends DOMNotificationListener>> subscribers) {
  42         this.notification = Preconditions.checkNotNull(notification);
  43         this.subscribers = Preconditions.checkNotNull(subscribers);
  44         this.future = SettableFuture.create();
  45         return this.future;
  46     }
  47
  48     void deliverNotification() {
  49         for (ListenerRegistration<? extends DOMNotificationListener> r : subscribers) {
  50             final DOMNotificationListener l = r.getInstance();
  51             if (l != null) {
  52                 l.onNotification(notification);
  53             }
  54         }
  55     }
  56
  57     void setFuture() {
  58         future.set(null);
  59     }
  60
  61 }