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.mdsal.binding.spec.reflect.BindingReflections;
  22 import org.opendaylight.yangtools.concepts.AbstractListenerRegistration;
  23 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  24 import org.opendaylight.yangtools.util.ListenerRegistry;
  25 import org.opendaylight.yangtools.yang.binding.Notification;
  26 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  27 import org.slf4j.Logger;
  28 import org.slf4j.LoggerFactory;
  29
  30 @Deprecated
  31 public class HeliumNotificationProviderServiceWithInterestListeners extends HeliumNotificationProviderServiceAdapter {
  32
  33     private static final Logger LOG = LoggerFactory.getLogger(
  34             HeliumNotificationProviderServiceWithInterestListeners.class);
  35
  36     private final ListenerRegistry<NotificationInterestListener> interestListeners = ListenerRegistry.create();
  37     private final ListenerRegistration<Listener> domListener;
  38     private final DOMNotificationService domService;
  39     private final BindingToNormalizedNodeCodec codec;
  40
  41     public HeliumNotificationProviderServiceWithInterestListeners(
  42             final BindingDOMNotificationPublishServiceAdapter publishService,
  43             final BindingDOMNotificationServiceAdapter listenService,
  44             final DOMNotificationSubscriptionListenerRegistry registry) {
  45         super(publishService, listenService);
  46         this.codec = publishService.getCodecRegistry();
  47         this.domListener = registry.registerSubscriptionListener(new Listener());
  48         this.domService = listenService.getDomService();
  49     }
  50
  51     @Override
  52     public ListenerRegistration<NotificationInterestListener> registerInterestListener(
  53             final NotificationInterestListener listener) {
  54         notifyListener(listener, translate(domListener.getInstance().getAllObserved()));
  55         return interestListeners.register(listener);
  56     }
  57
  58     private Set<Class<? extends Notification>> translate(final Set<SchemaPath> added) {
  59         return codec.getNotificationClasses(added);
  60     }
  61
  62     @SuppressWarnings("checkstyle:IllegalCatch")
  63     private void notifyAllListeners(final Set<SchemaPath> added) {
  64         final Iterator<? extends ListenerRegistration<? extends NotificationInterestListener>> listeners =
  65                 interestListeners.getRegistrations().iterator();
  66         if (listeners.hasNext()) {
  67             final Set<Class<? extends Notification>> baEvent = translate(added);
  68             while (listeners.hasNext()) {
  69                 final NotificationInterestListener listenerRef = listeners.next().getInstance();
  70                 try {
  71                     notifyListener(listenerRef, baEvent);
  72                 } catch (RuntimeException  e) {
  73                     LOG.warn("Unhandled exception during invoking listener {}", listenerRef, e);
  74                 }
  75             }
  76         }
  77     }
  78
  79     @Override
  80     public <T extends Notification> ListenerRegistration<NotificationListener<T>> registerNotificationListener(
  81             final Class<T> type, final NotificationListener<T> listener) {
  82
  83         final FunctionalNotificationListenerAdapter<T> adapter =
  84                 new FunctionalNotificationListenerAdapter<>(codec, type, listener);
  85         final SchemaPath domType = SchemaPath.create(true, BindingReflections.findQName(type));
  86         final ListenerRegistration<?> domReg = domService.registerNotificationListener(adapter, domType);
  87         return new AbstractListenerRegistration<NotificationListener<T>>(listener) {
  88             @Override
  89             protected void removeRegistration() {
  90                 domReg.close();
  91             }
  92         };
  93     }
  94
  95     private static void notifyListener(final NotificationInterestListener listener,
  96             final Set<Class<? extends Notification>> baEvent) {
  97         for (final Class<? extends Notification> event: baEvent) {
  98             listener.onNotificationSubscribtion(event);
  99         }
 100     }
 101
 102     private final class Listener implements DOMNotificationSubscriptionListener {
 103
 104         private volatile Set<SchemaPath> allObserved = Collections.emptySet();
 105
 106         @Override
 107         public void onSubscriptionChanged(final Set<SchemaPath> currentTypes) {
 108             final Set<SchemaPath> added = Sets.difference(currentTypes, allObserved).immutableCopy();
 109             notifyAllListeners(added);
 110             allObserved = Sets.union(allObserved, added).immutableCopy();
 111         }
 112
 113         Set<SchemaPath> getAllObserved() {
 114             return allObserved;
 115         }
 116     }
 117
 118     @Override
 119     public void close() {
 120         super.close();
 121         domListener.close();
 122     }
 123 }