001/* 002 * Copyright 2002-2012 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.servlet.view.tiles2; 018 019import java.util.Map; 020import java.util.concurrent.ConcurrentHashMap; 021 022import org.apache.tiles.TilesException; 023import org.apache.tiles.preparer.NoSuchPreparerException; 024import org.apache.tiles.preparer.PreparerException; 025import org.apache.tiles.preparer.ViewPreparer; 026 027import org.springframework.web.context.WebApplicationContext; 028 029/** 030 * Tiles {@link org.apache.tiles.preparer.PreparerFactory} implementation 031 * that expects preparer class names and builds preparer instances for those, 032 * creating them through the Spring ApplicationContext in order to apply 033 * Spring container callbacks and configured Spring BeanPostProcessors. 034 * 035 * <p><b>NOTE: Tiles 2 support is deprecated in favor of Tiles 3 and will be removed 036 * as of Spring Framework 5.0.</b>. 037 * 038 * @author Juergen Hoeller 039 * @since 2.5 040 * @see SpringBeanPreparerFactory 041 * @deprecated as of Spring 4.2, in favor of Tiles 3 042 */ 043@Deprecated 044public class SimpleSpringPreparerFactory extends AbstractSpringPreparerFactory { 045 046 /** Cache of shared ViewPreparer instances: bean name -> bean instance */ 047 private final Map<String, ViewPreparer> sharedPreparers = new ConcurrentHashMap<String, ViewPreparer>(16); 048 049 050 @Override 051 protected ViewPreparer getPreparer(String name, WebApplicationContext context) throws TilesException { 052 // Quick check on the concurrent map first, with minimal locking. 053 ViewPreparer preparer = this.sharedPreparers.get(name); 054 if (preparer == null) { 055 synchronized (this.sharedPreparers) { 056 preparer = this.sharedPreparers.get(name); 057 if (preparer == null) { 058 try { 059 Class<?> beanClass = context.getClassLoader().loadClass(name); 060 if (!ViewPreparer.class.isAssignableFrom(beanClass)) { 061 throw new PreparerException( 062 "Invalid preparer class [" + name + "]: does not implement ViewPreparer interface"); 063 } 064 preparer = (ViewPreparer) context.getAutowireCapableBeanFactory().createBean(beanClass); 065 this.sharedPreparers.put(name, preparer); 066 } 067 catch (ClassNotFoundException ex) { 068 throw new NoSuchPreparerException("Preparer class [" + name + "] not found", ex); 069 } 070 } 071 } 072 } 073 return preparer; 074 } 075 076}