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 static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.util.concurrent.ListenableFuture;
  13 import com.google.common.util.concurrent.SettableFuture;
  14 import com.lmax.disruptor.EventFactory;
  15 import java.util.Collection;
  16 import org.opendaylight.mdsal.dom.api.DOMNotification;
  17 import org.opendaylight.mdsal.dom.api.DOMNotificationListener;
  18 import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
  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     static final EventFactory<DOMNotificationRouterEvent> FACTORY = DOMNotificationRouterEvent::new;
  26
  27     private Collection<AbstractListenerRegistration<? extends DOMNotificationListener>> subscribers;
  28     private DOMNotification notification;
  29     private SettableFuture<Void> future;
  30
  31     private DOMNotificationRouterEvent() {
  32         // Hidden on purpose, initialized in initialize()
  33     }
  34
  35     @SuppressWarnings("checkstyle:hiddenField")
  36     ListenableFuture<Void> initialize(final DOMNotification notification,
  37             final Collection<AbstractListenerRegistration<? extends DOMNotificationListener>> subscribers) {
  38         this.notification = requireNonNull(notification);
  39         this.subscribers = requireNonNull(subscribers);
  40         this.future = SettableFuture.create();
  41         return this.future;
  42     }
  43
  44     void deliverNotification() {
  45         for (AbstractListenerRegistration<? extends DOMNotificationListener> r : subscribers) {
  46             if (r.notClosed()) {
  47                 r.getInstance().onNotification(notification);
  48             }
  49         }
  50     }
  51
  52     void setFuture() {
  53         future.set(null);
  54     }
  55
  56 }