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 import org.slf4j.Logger;
  20 import org.slf4j.LoggerFactory;
  21
  22 /**
  23  * A single notification event in the disruptor ringbuffer. These objects are reused, so they do have mutable state.
  24  */
  25 final class DOMNotificationRouterEvent {
  26     private static final Logger LOG = LoggerFactory.getLogger(DOMNotificationRouterEvent.class);
  27
  28     static final EventFactory<DOMNotificationRouterEvent> FACTORY = DOMNotificationRouterEvent::new;
  29
  30     private Collection<AbstractListenerRegistration<? extends DOMNotificationListener>> subscribers;
  31     private DOMNotification notification;
  32     private SettableFuture<Void> future;
  33
  34     private DOMNotificationRouterEvent() {
  35         // Hidden on purpose, initialized in initialize()
  36     }
  37
  38     @SuppressWarnings("checkstyle:hiddenField")
  39     ListenableFuture<Void> initialize(final DOMNotification notification,
  40             final Collection<AbstractListenerRegistration<? extends DOMNotificationListener>> subscribers) {
  41         this.notification = requireNonNull(notification);
  42         this.subscribers = requireNonNull(subscribers);
  43         this.future = SettableFuture.create();
  44         return this.future;
  45     }
  46
  47     @SuppressWarnings("checkstyle:illegalCatch")
  48     void deliverNotification() {
  49         for (AbstractListenerRegistration<? extends DOMNotificationListener> reg : subscribers) {
  50             if (reg.notClosed()) {
  51                 final DOMNotificationListener listener = reg.getInstance();
  52                 try {
  53                     listener.onNotification(notification);
  54                 } catch (Exception e) {
  55                     LOG.warn("Listener {} failed during notification delivery", listener, e);
  56                 }
  57             }
  58         }
  59     }
  60
  61     void setFuture() {
  62         future.set(null);
  63     }
  64 }