binding/mdsal-binding-dom-adapter/src/main/java/org/opendaylight/mdsal/binding/dom/adapter/BindingDOMNotificationListenerAdapter.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.mdsal.binding.dom.adapter;
   9
  10 import com.google.common.collect.ImmutableMap;
  11 import com.google.common.reflect.TypeToken;
  12 import java.lang.reflect.Method;
  13 import java.util.HashMap;
  14 import java.util.HashSet;
  15 import java.util.Map;
  16 import java.util.Set;
  17 import org.opendaylight.mdsal.binding.dom.adapter.invoke.NotificationListenerInvoker;
  18 import org.opendaylight.mdsal.binding.dom.codec.api.BindingNormalizedNodeSerializer;
  19 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
  20 import org.opendaylight.mdsal.dom.api.DOMEvent;
  21 import org.opendaylight.mdsal.dom.api.DOMNotification;
  22 import org.opendaylight.mdsal.dom.api.DOMNotificationListener;
  23 import org.opendaylight.yangtools.yang.binding.Notification;
  24 import org.opendaylight.yangtools.yang.binding.NotificationListener;
  25 import org.opendaylight.yangtools.yang.common.QName;
  26 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  27
  28 class BindingDOMNotificationListenerAdapter implements DOMNotificationListener {
  29
  30     private final BindingNormalizedNodeSerializer codec;
  31     private final NotificationListener delegate;
  32     private final ImmutableMap<SchemaPath, NotificationListenerInvoker> invokers;
  33
  34     BindingDOMNotificationListenerAdapter(final BindingNormalizedNodeSerializer codec,
  35             final NotificationListener delegate) {
  36         this.codec = codec;
  37         this.delegate = delegate;
  38         this.invokers = createInvokerMapFor(delegate.getClass());
  39     }
  40
  41     @Override
  42     public void onNotification(final DOMNotification notification) {
  43         final Notification baNotification = deserialize(notification);
  44         final QName notificationQName = notification.getType().getLastComponent();
  45         getInvoker(notification.getType()).invokeNotification(delegate, notificationQName, baNotification);
  46     }
  47
  48     private Notification deserialize(final DOMNotification notification) {
  49         if (notification instanceof LazySerializedDOMNotification) {
  50             // TODO: This is a routed-back notification, for which we may end up losing event time here, but that is
  51             //       okay, for now at least.
  52             return ((LazySerializedDOMNotification) notification).getBindingData();
  53         }
  54         return notification instanceof DOMEvent ? codec.fromNormalizedNodeNotification(notification.getType(),
  55             notification.getBody(), ((DOMEvent) notification).getEventInstant())
  56                 : codec.fromNormalizedNodeNotification(notification.getType(), notification.getBody());
  57     }
  58
  59     private NotificationListenerInvoker getInvoker(final SchemaPath type) {
  60         return invokers.get(type);
  61     }
  62
  63     protected Set<SchemaPath> getSupportedNotifications() {
  64         return invokers.keySet();
  65     }
  66
  67     private static ImmutableMap<SchemaPath, NotificationListenerInvoker> createInvokerMapFor(
  68             final Class<? extends NotificationListener> implClz) {
  69         final Map<SchemaPath, NotificationListenerInvoker> builder = new HashMap<>();
  70         for (final TypeToken<?> ifaceToken : TypeToken.of(implClz).getTypes().interfaces()) {
  71             Class<?> iface = ifaceToken.getRawType();
  72             if (NotificationListener.class.isAssignableFrom(iface) && BindingReflections.isBindingClass(iface)) {
  73                 @SuppressWarnings("unchecked")
  74                 final Class<? extends NotificationListener> listenerType
  75                         = (Class<? extends NotificationListener>) iface;
  76                 final NotificationListenerInvoker invoker = NotificationListenerInvoker.from(listenerType);
  77                 for (final SchemaPath path : getNotificationTypes(listenerType)) {
  78                     builder.put(path, invoker);
  79                 }
  80             }
  81         }
  82         return ImmutableMap.copyOf(builder);
  83     }
  84
  85     private static Set<SchemaPath> getNotificationTypes(final Class<? extends NotificationListener> type) {
  86         // TODO: Investigate possibility and performance impact if we cache this or expose
  87         // it from NotificationListenerInvoker
  88         final Set<SchemaPath> ret = new HashSet<>();
  89         for (final Method method : type.getMethods()) {
  90             if (BindingReflections.isNotificationCallback(method)) {
  91                 final Class<?> notification = method.getParameterTypes()[0];
  92                 final QName name = BindingReflections.findQName(notification);
  93                 ret.add(SchemaPath.create(true, name));
  94             }
  95         }
  96         return ret;
  97     }
  98 }