001/* 002 * Copyright 2002-2014 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.aop.framework.autoproxy.target; 018 019import org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource; 020import org.springframework.aop.target.LazyInitTargetSource; 021import org.springframework.beans.factory.config.BeanDefinition; 022import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; 023 024/** 025 * TargetSourceCreator that enforces a LazyInitTargetSource for each bean 026 * that is defined as "lazy-init". This will lead to a proxy created for 027 * each of those beans, allowing to fetch a reference to such a bean 028 * without actually initializing the target bean instance. 029 * 030 * <p>To be registered as custom TargetSourceCreator for an auto-proxy creator, 031 * in combination with custom interceptors for specific beans or for the 032 * creation of lazy-init proxies only. For example, as autodetected 033 * infrastructure bean in an XML application context definition: 034 * 035 * <pre class="code"> 036 * <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator"> 037 * <property name="customTargetSourceCreators"> 038 * <list> 039 * <bean class="org.springframework.aop.framework.autoproxy.target.LazyInitTargetSourceCreator"/> 040 * </list> 041 * </property> 042 * </bean> 043 * 044 * <bean id="myLazyInitBean" class="mypackage.MyBeanClass" lazy-init="true"> 045 * ... 046 * </bean></pre> 047 * 048 * @author Juergen Hoeller 049 * @since 1.2 050 * @see org.springframework.beans.factory.config.BeanDefinition#isLazyInit 051 * @see org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#setCustomTargetSourceCreators 052 * @see org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator 053 */ 054public class LazyInitTargetSourceCreator extends AbstractBeanFactoryBasedTargetSourceCreator { 055 056 @Override 057 protected boolean isPrototypeBased() { 058 return false; 059 } 060 061 @Override 062 protected AbstractBeanFactoryBasedTargetSource createBeanFactoryBasedTargetSource( 063 Class<?> beanClass, String beanName) { 064 065 if (getBeanFactory() instanceof ConfigurableListableBeanFactory) { 066 BeanDefinition definition = 067 ((ConfigurableListableBeanFactory) getBeanFactory()).getBeanDefinition(beanName); 068 if (definition.isLazyInit()) { 069 return new LazyInitTargetSource(); 070 } 071 } 072 return null; 073 } 074 075}