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  /*
   * Copyright (C) 2007 The Guava Authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 package org.sonatype.sisu.goodies.eventbus.internal.guava;
 
 
A HandlerFindingStrategy for collecting all event handler methods that are marked with the com.google.common.eventbus.Subscribe annotation.

Author(s):
Cliff Biffle
 
This implementation finds all methods marked with a com.google.common.eventbus.Subscribe annotation.
 
   @Override
   public Multimap<Class<?>, EventHandlerfindAllHandlers(Object listener) {
     Multimap<Class<?>, EventHandlermethodsInListener =
         HashMultimap.create();
     Class clazz = listener.getClass();
     while (clazz != null) {
       for (Method method : clazz.getMethods()) {
         Subscribe annotation = method.getAnnotation(Subscribe.class);
 
         if (annotation != null) {
           Class<?>[] parameterTypes = method.getParameterTypes();
           if (parameterTypes.length != 1) {
             throw new IllegalArgumentException(
                 "Method " + method + " has @Subscribe annotation, but requires " +
                 parameterTypes.length + " arguments.  Event handler methods " +
                 "must require a single argument.");
           }
           Class<?> eventType = parameterTypes[0];
           EventHandler handler = makeHandler(listenermethod);
 
           methodsInListener.put(eventTypehandler);
         }
       }
       clazz = clazz.getSuperclass();
     }
     return methodsInListener;
   }

  
Creates an EventHandler for subsequently calling method on listener. Selects an EventHandler implementation based on the annotations on method.

Parameters:
listener object bearing the event handler method.
method the event handler method to wrap in an EventHandler.
Returns:
an EventHandler that will call method on listener when invoked.
 
   private static EventHandler makeHandler(Object listenerMethod method) {
     EventHandler wrapper;
     if (methodIsDeclaredThreadSafe(method)) {
       wrapper = new EventHandler(listenermethod);
     } else {
       wrapper = new SynchronizedEventHandler(listenermethod);
     }
     return wrapper;
   }

  
Checks whether method is thread-safe, as indicated by the com.google.common.eventbus.AllowConcurrentEvents annotation.

Parameters:
method handler method to check.
Returns:
true if handler is marked as thread-safe, false otherwise.
 
   private static boolean methodIsDeclaredThreadSafe(Method method) {
     return method.getAnnotation(AllowConcurrentEvents.class) != null;
   }
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