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 015package org.apache.tapestry.services.impl; 016 017import java.io.IOException; 018 019import org.apache.tapestry.Constants; 020import org.apache.tapestry.IEngine; 021import org.apache.tapestry.services.EngineManager; 022import org.apache.tapestry.services.Infrastructure; 023import org.apache.tapestry.services.RequestGlobals; 024import org.apache.tapestry.services.WebRequestServicer; 025import org.apache.tapestry.web.WebRequest; 026import 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 */ 039public 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}