// Copyright 2006, 2007, 2008 The Apache Software Foundation

 //

 // 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.apache.tapestry5.internal.event;

 import static org.apache.tapestry5.ioc.internal.util.CollectionFactory.newThreadSafeList;

 import org.apache.tapestry5.services.InvalidationEventHub;

 import org.apache.tapestry5.services.InvalidationListener;

 import java.util.List;

 /**

  * Base implementation class for classes (especially services) that need to manage a list of {@link

  * org.apache.tapestry5.services.InvalidationListener}s.

  */

 public class InvalidationEventHubImpl implements InvalidationEventHub

 {

     private final List<InvalidationListener> listeners = newThreadSafeList();

     /**

      * Notifies all {@link InvalidationListener listener}s.

      */

     protected final void fireInvalidationEvent()

     {

         for (InvalidationListener listener : listeners)

         {

             listener.objectWasInvalidated();

         }

     }

     public final void addInvalidationListener(InvalidationListener listener)

     {

         listeners.add(listener);

     }

 }