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.impl.BindingDOMNotificationPublishServiceAdapter;
  15 import org.opendaylight.controller.md.sal.binding.impl.BindingDOMNotificationServiceAdapter;
  16 import org.opendaylight.controller.md.sal.binding.impl.BindingToNormalizedNodeCodec;
  17 import org.opendaylight.controller.md.sal.dom.api.DOMNotificationService;
  18 import org.opendaylight.controller.md.sal.dom.spi.DOMNotificationSubscriptionListener;
  19 import org.opendaylight.controller.md.sal.dom.spi.DOMNotificationSubscriptionListenerRegistry;
  20 import org.opendaylight.controller.sal.binding.api.NotificationListener;
  21 import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
  22 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  23 import org.opendaylight.yangtools.util.ListenerRegistry;
  24 import org.opendaylight.yangtools.yang.binding.Notification;
  25 import org.opendaylight.yangtools.yang.binding.util.BindingReflections;
  26 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 public class HeliumNotificationProviderServiceWithInterestListeners extends HeliumNotificationProviderServiceAdapter {
  31
  32     private static final Logger LOG = LoggerFactory.getLogger(
  33             HeliumNotificationProviderServiceWithInterestListeners.class);
  34
  35     private final ListenerRegistry<NotificationInterestListener> interestListeners = ListenerRegistry.create();
  36     private final ListenerRegistration<Listener> domListener;
  37     private final DOMNotificationService domService;
  38     private final BindingToNormalizedNodeCodec codec;
  39
  40     public HeliumNotificationProviderServiceWithInterestListeners(
  41             final BindingDOMNotificationPublishServiceAdapter publishService,
  42             final BindingDOMNotificationServiceAdapter listenService,
  43             final DOMNotificationSubscriptionListenerRegistry registry) {
  44         super(publishService, listenService);
  45         this.codec = publishService.getCodecRegistry();
  46         this.domListener = registry.registerSubscriptionListener(new Listener());
  47         this.domService = listenService.getDomService();
  48     }
  49
  50     @Override
  51     public ListenerRegistration<NotificationInterestListener> registerInterestListener(
  52             final NotificationInterestListener listener) {
  53         notifyListener(listener, translate(domListener.getInstance().getAllObserved()));
  54         return interestListeners.register(listener);
  55     }
  56
  57     private Set<Class<? extends Notification>> translate(final Set<SchemaPath> added) {
  58         return codec.getNotificationClasses(added);
  59     }
  60
  61     @SuppressWarnings("checkstyle:IllegalCatch")
  62     private void notifyAllListeners(final Set<SchemaPath> added) {
  63         final Iterator<ListenerRegistration<NotificationInterestListener>> listeners = interestListeners.iterator();
  64         if (listeners.hasNext()) {
  65             final Set<Class<? extends Notification>> baEvent = translate(added);
  66             while (listeners.hasNext()) {
  67                 final NotificationInterestListener listenerRef = listeners.next().getInstance();
  68                 try {
  69                     notifyListener(listenerRef, baEvent);
  70                 } catch (RuntimeException  e) {
  71                     LOG.warn("Unhandled exception during invoking listener {}", e, listenerRef);
  72                 }
  73             }
  74         }
  75     }
  76
  77     @Override
  78     public <T extends Notification> ListenerRegistration<NotificationListener<T>> registerNotificationListener(
  79             final Class<T> type, final NotificationListener<T> listener) {
  80
  81         final FunctionalNotificationListenerAdapter<T> adapter =
  82                 new FunctionalNotificationListenerAdapter<>(codec, type, listener);
  83         final SchemaPath domType = SchemaPath.create(true, BindingReflections.findQName(type));
  84         final ListenerRegistration<?> domReg = domService.registerNotificationListener(adapter, domType);
  85         return new AbstractListenerRegistration<NotificationListener<T>>(listener) {
  86             @Override
  87             protected void removeRegistration() {
  88                 domReg.close();
  89             }
  90         };
  91     }
  92
  93     private void notifyListener(final NotificationInterestListener listener,
  94             final Set<Class<? extends Notification>> baEvent) {
  95         for (final Class<? extends Notification> event: baEvent) {
  96             listener.onNotificationSubscribtion(event);
  97         }
  98     }
  99
 100     private final class Listener implements DOMNotificationSubscriptionListener {
 101
 102         private volatile Set<SchemaPath> allObserved = Collections.emptySet();
 103
 104         @Override
 105         public void onSubscriptionChanged(final Set<SchemaPath> currentTypes) {
 106             final Set<SchemaPath> added = Sets.difference(currentTypes, allObserved).immutableCopy();
 107             notifyAllListeners(added);
 108             allObserved = Sets.union(allObserved, added).immutableCopy();
 109         }
 110
 111         Set<SchemaPath> getAllObserved() {
 112             return allObserved;
 113         }
 114     }
 115
 116     @Override
 117     public void close() throws Exception {
 118         super.close();
 119         domListener.close();
 120     }
 121 }