opendaylight/md-sal/sal-binding-broker/src/main/java/org/opendaylight/controller/md/sal/binding/compat/HeliumNotificationProviderServiceWithInterestListeners.java

   1 /*
   2  * Copyright (c) 2015 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.md.sal.binding.compat;
   9
  10 import com.google.common.collect.Sets;
  11 import java.util.Collections;
  12 import java.util.Iterator;
  13 import java.util.Set;
  14 import org.opendaylight.controller.md.sal.binding.api.NotificationPublishService;
  15 import org.opendaylight.controller.md.sal.binding.api.NotificationService;
  16 import org.opendaylight.controller.md.sal.binding.impl.BindingToNormalizedNodeCodec;
  17 import org.opendaylight.controller.md.sal.dom.spi.DOMNotificationSubscriptionListener;
  18 import org.opendaylight.controller.md.sal.dom.spi.DOMNotificationSubscriptionListenerRegistry;
  19 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  20 import org.opendaylight.yangtools.util.ListenerRegistry;
  21 import org.opendaylight.yangtools.yang.binding.Notification;
  22 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  23 import org.slf4j.Logger;
  24 import org.slf4j.LoggerFactory;
  25
  26 public class HeliumNotificationProviderServiceWithInterestListeners extends HeliumNotificationProviderServiceAdapter {
  27
  28     private static final Logger LOG = LoggerFactory.getLogger(HeliumNotificationProviderServiceWithInterestListeners.class);
  29
  30     private final ListenerRegistry<NotificationInterestListener> interestListeners = ListenerRegistry.create();
  31     private final ListenerRegistration<Listener> domListener;
  32     private final BindingToNormalizedNodeCodec codec;
  33
  34     public HeliumNotificationProviderServiceWithInterestListeners(
  35             final NotificationPublishService publishService, final NotificationService listenService, final BindingToNormalizedNodeCodec codec, final DOMNotificationSubscriptionListenerRegistry registry) {
  36         super(publishService, listenService);
  37         this.codec = codec;
  38         this.domListener = registry.registerSubscriptionListener(new Listener());
  39     }
  40
  41     @Override
  42     public ListenerRegistration<NotificationInterestListener> registerInterestListener(
  43             final NotificationInterestListener listener) {
  44         notifyListener(listener, translate(domListener.getInstance().getAllObserved()));
  45         return interestListeners.register(listener);
  46     }
  47
  48     private Set<Class<? extends Notification>> translate(final Set<SchemaPath> added) {
  49         return codec.getNotificationClasses(added);
  50     }
  51
  52     private void notifyAllListeners(final Set<SchemaPath> added) {
  53         final Iterator<ListenerRegistration<NotificationInterestListener>> listeners = interestListeners.iterator();
  54         if(listeners.hasNext()) {
  55             final Set<Class<? extends Notification>> baEvent = translate(added);
  56             while(listeners.hasNext()) {
  57                 final NotificationInterestListener listenerRef = listeners.next().getInstance();
  58                 try {
  59                     notifyListener(listenerRef,baEvent);
  60                 } catch (final Exception e) {
  61                     LOG.warn("Unhandled exception during invoking listener {}",e, listenerRef);
  62                 }
  63             }
  64         }
  65     }
  66
  67     private void notifyListener(final NotificationInterestListener listener, final Set<Class<? extends Notification>> baEvent) {
  68         for(final Class<? extends Notification> event: baEvent) {
  69             listener.onNotificationSubscribtion(event);
  70         }
  71     }
  72
  73     private final class Listener implements DOMNotificationSubscriptionListener {
  74
  75         private volatile Set<SchemaPath> allObserved = Collections.emptySet();
  76
  77         @Override
  78         public void onSubscriptionChanged(final Set<SchemaPath> currentTypes) {
  79             final Set<SchemaPath> added = Sets.difference(currentTypes, allObserved).immutableCopy();
  80             notifyAllListeners(added);
  81             allObserved = Sets.union(allObserved, added).immutableCopy();
  82         }
  83
  84         Set<SchemaPath> getAllObserved() {
  85             return allObserved;
  86         }
  87     }
  88
  89     @Override
  90     public void close() throws Exception {
  91         super.close();
  92         domListener.close();
  93     }
  94 }