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