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 }