001    //  Copyright 2008 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry5.internal.services;
016    
017    import org.apache.tapestry5.internal.events.EndOfRequestListener;
018    import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
019    import org.apache.tapestry5.services.RequestGlobals;
020    
021    import java.util.List;
022    
023    public class EndOfRequestEventHubImpl implements EndOfRequestEventHub
024    {
025        private final RequestGlobals requestGlobals;
026    
027        public EndOfRequestEventHubImpl(RequestGlobals requestGlobals) {
028            this.requestGlobals = requestGlobals;
029        }
030    
031        private final List<EndOfRequestListener> listeners = CollectionFactory.newThreadSafeList();
032    
033        public void addEndOfRequestListener(EndOfRequestListener listener)
034        {
035            listeners.add(listener);
036        }
037    
038        public void removeEndOfRequestListener(EndOfRequestListener listener)
039        {
040            listeners.remove(listener);
041        }
042    
043        public void fire()
044        {
045            // TAP5-986: do not fire if request is already cleaned up. Container may use the same thread for different dispatches
046            if (requestGlobals.getRequest() == null) return;
047            for (EndOfRequestListener l : listeners)
048            {
049                l.requestDidComplete();
050            }
051        }
052    }