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.context.access; 018 019import org.springframework.beans.factory.BeanFactory; 020import org.springframework.beans.factory.access.BeanFactoryReference; 021import org.springframework.context.ApplicationContext; 022import org.springframework.context.ConfigurableApplicationContext; 023 024/** 025 * ApplicationContext-specific implementation of BeanFactoryReference, 026 * wrapping a newly created ApplicationContext, closing it on release. 027 * 028 * <p>As per BeanFactoryReference contract, {@code release} may be called 029 * more than once, with subsequent calls not doing anything. However, calling 030 * {@code getFactory} after a {@code release} call will cause an exception. 031 * 032 * @author Juergen Hoeller 033 * @author Colin Sampaleanu 034 * @since 13.02.2004 035 * @see org.springframework.context.ConfigurableApplicationContext#close 036 */ 037public class ContextBeanFactoryReference implements BeanFactoryReference { 038 039 private ApplicationContext applicationContext; 040 041 042 /** 043 * Create a new ContextBeanFactoryReference for the given context. 044 * @param applicationContext the ApplicationContext to wrap 045 */ 046 public ContextBeanFactoryReference(ApplicationContext applicationContext) { 047 this.applicationContext = applicationContext; 048 } 049 050 051 @Override 052 public BeanFactory getFactory() { 053 if (this.applicationContext == null) { 054 throw new IllegalStateException( 055 "ApplicationContext owned by this BeanFactoryReference has been released"); 056 } 057 return this.applicationContext; 058 } 059 060 @Override 061 public void release() { 062 if (this.applicationContext != null) { 063 ApplicationContext savedCtx; 064 065 // We don't actually guarantee thread-safety, but it's not a lot of extra work. 066 synchronized (this) { 067 savedCtx = this.applicationContext; 068 this.applicationContext = null; 069 } 070 071 if (savedCtx != null && savedCtx instanceof ConfigurableApplicationContext) { 072 ((ConfigurableApplicationContext) savedCtx).close(); 073 } 074 } 075 } 076 077}