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.util.Locale; 018 019import org.apache.tapestry.IEngine; 020import org.apache.tapestry.services.EngineFactory; 021import org.apache.tapestry.services.EngineManager; 022import org.apache.tapestry.services.RequestLocaleManager; 023import org.apache.tapestry.services.ObjectPool; 024 025/** 026 * Implementation of service {@link org.apache.tapestry.services.EngineManager}. 027 * Service point tapestry.request.EngineManager. 028 * 029 * @author Howard Lewis Ship 030 * @since 4.0 031 */ 032public class EngineManagerImpl implements EngineManager 033{ 034 private ObjectPool _enginePool; 035 036 private EngineFactory _engineFactory; 037 038 private RequestLocaleManager _localeManager; 039 040 public IEngine getEngineInstance() 041 { 042 Locale locale = _localeManager.extractLocaleForCurrentRequest(); 043 044 IEngine result = (IEngine) _enginePool.get(locale); 045 046 // This happens when either the pool is empty, or when a session exists 047 // but the engine has not been stored into it (which should never happen, and 048 // probably indicates an error in the framework or the application). 049 050 if (result == null) 051 result = _engineFactory.constructNewEngineInstance(locale); 052 053 return result; 054 } 055 056 public void storeEngineInstance(IEngine engine) 057 { 058 _enginePool.store(engine.getLocale(), engine); 059 } 060 061 public void setEngineFactory(EngineFactory factory) 062 { 063 _engineFactory = factory; 064 } 065 066 public void setEnginePool(ObjectPool pool) 067 { 068 _enginePool = pool; 069 } 070 071 public void setLocaleManager(RequestLocaleManager manager) 072 { 073 _localeManager = manager; 074 } 075}