001    // Copyright 2004, 2005 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.tapestry.services.impl;
016    
017    import java.io.IOException;
018    
019    import org.apache.tapestry.Constants;
020    import org.apache.tapestry.IEngine;
021    import org.apache.tapestry.services.EngineManager;
022    import org.apache.tapestry.services.Infrastructure;
023    import org.apache.tapestry.services.RequestGlobals;
024    import org.apache.tapestry.services.WebRequestServicer;
025    import org.apache.tapestry.web.WebRequest;
026    import org.apache.tapestry.web.WebResponse;
027    
028    /**
029     * The terminatior for the <code>tapestry.RequestProcessor</code> pipeline, this service is
030     * responsible for:
031     * <ul>
032     * <li>Storing the request and response into {@link org.apache.tapestry.services.RequestGlobals}.
033     * <li>Locating the correct engine instance and letting it to the rest of the request.
034     * <li>Returning the engine instance to the pool at the end of the request. </ul
035     * 
036     * @author Howard Lewis Ship
037     * @since 4.0
038     */
039    public class InvokeEngineTerminator implements WebRequestServicer
040    {
041        private EngineManager _engineManager;
042    
043        private Infrastructure _infrastructure;
044    
045        private RequestGlobals _requestGlobals;
046    
047        public void service(WebRequest request, WebResponse response) throws IOException
048        {
049            _requestGlobals.store(request, response);
050    
051            IEngine engine = _engineManager.getEngineInstance();
052    
053            // Until we can inject the infrastructure into the engine
054            // we do this to let the engine know about it.
055    
056            request.setAttribute(Constants.INFRASTRUCTURE_KEY, _infrastructure);
057    
058            try
059            {
060                engine.service(request, response);
061            }
062            finally
063            {
064                _engineManager.storeEngineInstance(engine);
065            }
066    
067        }
068    
069        public void setEngineManager(EngineManager manager)
070        {
071            _engineManager = manager;
072        }
073    
074        public void setInfrastructure(Infrastructure infrastructure)
075        {
076            _infrastructure = infrastructure;
077        }
078    
079        public void setRequestGlobals(RequestGlobals requestGlobals)
080        {
081            _requestGlobals = requestGlobals;
082        }
083    }