opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/sal/binding/impl/NotificationBrokerImpl.java

   1 /**
   2  * Copyright (c) 2013 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.sal.binding.impl;
   9
  10 import java.util.Collections;
  11 import java.util.Set;
  12 import java.util.concurrent.ExecutorService;
  13
  14 import org.eclipse.xtext.xbase.lib.Conversions;
  15 import org.eclipse.xtext.xbase.lib.Functions.Function1;
  16 import org.eclipse.xtext.xbase.lib.IterableExtensions;
  17 import org.opendaylight.controller.sal.binding.api.NotificationListener;
  18 import org.opendaylight.controller.sal.binding.api.NotificationProviderService;
  19 import org.opendaylight.controller.sal.binding.codegen.impl.SingletonHolder;
  20 import org.opendaylight.controller.sal.binding.spi.NotificationInvokerFactory.NotificationInvoker;
  21 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  22 import org.opendaylight.yangtools.concepts.Registration;
  23 import org.opendaylight.yangtools.concepts.util.ListenerRegistry;
  24 import org.opendaylight.yangtools.yang.binding.Notification;
  25 import org.slf4j.Logger;
  26 import org.slf4j.LoggerFactory;
  27
  28 import com.google.common.base.Preconditions;
  29 import com.google.common.collect.HashMultimap;
  30 import com.google.common.collect.Iterables;
  31 import com.google.common.collect.Multimap;
  32 import com.google.common.collect.Multimaps;
  33
  34 public class NotificationBrokerImpl implements NotificationProviderService, AutoCloseable {
  35     private static final Logger LOG = LoggerFactory.getLogger(NotificationBrokerImpl.class);
  36
  37     private final ListenerRegistry<NotificationInterestListener> interestListeners =
  38             ListenerRegistry.create();
  39
  40     private final Multimap<Class<? extends Notification>, NotificationListener<?>> listeners =
  41             Multimaps.synchronizedSetMultimap(HashMultimap.<Class<? extends Notification>, NotificationListener<?>>create());
  42     private ExecutorService executor;
  43
  44     @Deprecated
  45     public NotificationBrokerImpl(final ExecutorService executor) {
  46         this.setExecutor(executor);
  47     }
  48
  49     public void setExecutor(final ExecutorService executor) {
  50         this.executor = Preconditions.checkNotNull(executor);
  51     }
  52
  53     public Iterable<Class<?>> getNotificationTypes(final Notification notification) {
  54         Class<?>[] _interfaces = notification.getClass().getInterfaces();
  55         final Function1<Class<?>, Boolean> _function = new Function1<Class<?>, Boolean>() {
  56             @Override
  57             public Boolean apply(final Class<?> it) {
  58                 if (Notification.class.equals(it)) {
  59                     return false;
  60                 }
  61                 return Notification.class.isAssignableFrom(it);
  62             }
  63         };
  64         return IterableExtensions.filter(((Iterable<Class<?>>)Conversions.doWrapArray(_interfaces)), _function);
  65     }
  66
  67     @Override
  68     public void publish(final Notification notification) {
  69         this.publish(notification, executor);
  70     }
  71
  72     @Override
  73     public void publish(final Notification notification, final ExecutorService service) {
  74         Iterable<NotificationListener<?>> listenerToNotify = Collections.emptySet();
  75         for (final Class<?> type : getNotificationTypes(notification)) {
  76             listenerToNotify = Iterables.concat(listenerToNotify, listeners.get(((Class<? extends Notification>) type)));
  77         }
  78         final Function1<NotificationListener<?>,NotifyTask> _function = new Function1<NotificationListener<?>, NotifyTask>() {
  79             @Override
  80             public NotifyTask apply(final NotificationListener<?> it) {
  81                 return new NotifyTask(it, notification);
  82             }
  83         };
  84         final Set<NotifyTask> tasks = IterableExtensions.<NotifyTask>toSet(
  85                 IterableExtensions.<NotificationListener<?>, NotifyTask>map(listenerToNotify, _function));
  86
  87         for (final NotifyTask task : tasks) {
  88             service.submit(task);
  89         }
  90     }
  91
  92     @Override
  93     public <T extends Notification> Registration<NotificationListener<T>> registerNotificationListener(final Class<T> notificationType, final NotificationListener<T> listener) {
  94         final GenericNotificationRegistration<T> reg = new GenericNotificationRegistration<T>(notificationType, listener, this);
  95         this.listeners.put(notificationType, listener);
  96         this.announceNotificationSubscription(notificationType);
  97         return reg;
  98     }
  99
 100     private void announceNotificationSubscription(final Class<? extends Notification> notification) {
 101         for (final ListenerRegistration<NotificationInterestListener> listener : interestListeners) {
 102             try {
 103                 listener.getInstance().onNotificationSubscribtion(notification);
 104             } catch (Exception e) {
 105                 LOG.warn("Listener {} reported unexpected error on notification {}",
 106                         listener.getInstance(), notification, e);
 107             }
 108         }
 109     }
 110
 111     @Override
 112     public Registration<org.opendaylight.yangtools.yang.binding.NotificationListener> registerNotificationListener(final org.opendaylight.yangtools.yang.binding.NotificationListener listener) {
 113         final NotificationInvoker invoker = SingletonHolder.INVOKER_FACTORY.invokerFor(listener);
 114         for (final Class<? extends Notification> notifyType : invoker.getSupportedNotifications()) {
 115             listeners.put(notifyType, invoker.getInvocationProxy());
 116             announceNotificationSubscription(notifyType);
 117         }
 118
 119         return new GeneratedListenerRegistration(listener, invoker, this);
 120     }
 121
 122     protected boolean unregisterListener(final GenericNotificationRegistration<?> reg) {
 123         return listeners.remove(reg.getType(), reg.getInstance());
 124     }
 125
 126     protected void unregisterListener(final GeneratedListenerRegistration reg) {
 127         final NotificationInvoker invoker = reg.getInvoker();
 128         for (final Class<? extends Notification> notifyType : invoker.getSupportedNotifications()) {
 129             this.listeners.remove(notifyType, invoker.getInvocationProxy());
 130         }
 131     }
 132
 133     @Override
 134     public void close() {
 135     }
 136
 137     @Override
 138     public ListenerRegistration<NotificationInterestListener> registerInterestListener(final NotificationInterestListener interestListener) {
 139         final ListenerRegistration<NotificationInterestListener> registration = this.interestListeners.register(interestListener);
 140         for (final Class<? extends Notification> notification : listeners.keySet()) {
 141             interestListener.onNotificationSubscribtion(notification);
 142         }
 143         return registration;
 144     }
 145 }