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 static java.util.Objects.requireNonNull;
  11
  12 import com.google.common.collect.ImmutableMap;
  13 import com.google.common.reflect.TypeToken;
  14 import java.lang.reflect.Method;
  15 import java.util.HashMap;
  16 import java.util.HashSet;
  17 import java.util.Map;
  18 import java.util.Set;
  19 import org.opendaylight.mdsal.binding.dom.adapter.invoke.NotificationListenerInvoker;
  20 import org.opendaylight.mdsal.binding.spec.reflect.BindingReflections;
  21 import org.opendaylight.mdsal.dom.api.DOMEvent;
  22 import org.opendaylight.mdsal.dom.api.DOMNotification;
  23 import org.opendaylight.mdsal.dom.api.DOMNotificationListener;
  24 import org.opendaylight.yangtools.yang.binding.Notification;
  25 import org.opendaylight.yangtools.yang.binding.NotificationListener;
  26 import org.opendaylight.yangtools.yang.common.QName;
  27 import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
  28
  29 class BindingDOMNotificationListenerAdapter implements DOMNotificationListener {
  30
  31     private final AdapterContext adapterContext;
  32     private final NotificationListener delegate;
  33     private final ImmutableMap<Absolute, NotificationListenerInvoker> invokers;
  34
  35     BindingDOMNotificationListenerAdapter(final AdapterContext adapterContext, final NotificationListener delegate) {
  36         this.adapterContext = requireNonNull(adapterContext);
  37         this.delegate = requireNonNull(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().lastNodeIdentifier();
  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
  55         final CurrentAdapterSerializer serializer = adapterContext.currentSerializer();
  56         return notification instanceof DOMEvent ? serializer.fromNormalizedNodeNotification(notification.getType(),
  57             notification.getBody(), ((DOMEvent) notification).getEventInstant())
  58                 : serializer.fromNormalizedNodeNotification(notification.getType(), notification.getBody());
  59     }
  60
  61     private NotificationListenerInvoker getInvoker(final Absolute type) {
  62         return invokers.get(type);
  63     }
  64
  65     protected Set<Absolute> getSupportedNotifications() {
  66         return invokers.keySet();
  67     }
  68
  69     private static ImmutableMap<Absolute, NotificationListenerInvoker> createInvokerMapFor(
  70             final Class<? extends NotificationListener> implClz) {
  71         final Map<Absolute, NotificationListenerInvoker> builder = new HashMap<>();
  72         for (final TypeToken<?> ifaceToken : TypeToken.of(implClz).getTypes().interfaces()) {
  73             Class<?> iface = ifaceToken.getRawType();
  74             if (NotificationListener.class.isAssignableFrom(iface) && BindingReflections.isBindingClass(iface)) {
  75                 @SuppressWarnings("unchecked")
  76                 final Class<? extends NotificationListener> listenerType
  77                         = (Class<? extends NotificationListener>) iface;
  78                 final NotificationListenerInvoker invoker = NotificationListenerInvoker.from(listenerType);
  79                 for (final Absolute path : getNotificationTypes(listenerType)) {
  80                     builder.put(path, invoker);
  81                 }
  82             }
  83         }
  84         return ImmutableMap.copyOf(builder);
  85     }
  86
  87     private static Set<Absolute> getNotificationTypes(final Class<? extends NotificationListener> type) {
  88         // TODO: Investigate possibility and performance impact if we cache this or expose
  89         // it from NotificationListenerInvoker
  90         final Set<Absolute> ret = new HashSet<>();
  91         for (final Method method : type.getMethods()) {
  92             if (BindingReflections.isNotificationCallback(method)) {
  93                 final Class<?> notification = method.getParameterTypes()[0];
  94                 ret.add(Absolute.of(BindingReflections.findQName(notification)));
  95             }
  96         }
  97         return ret;
  98     }
  99 }