org.springframework.aop.framework.autoproxy.target.LazyInitTargetSourceCreator Maven / Gradle / Ivy
/*
* Copyright 2002-2020 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.aop.framework.autoproxy.target;
import org.springframework.aop.target.AbstractBeanFactoryBasedTargetSource;
import org.springframework.aop.target.LazyInitTargetSource;
import org.springframework.beans.factory.config.BeanDefinition;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.lang.Nullable;
/**
* {@code TargetSourceCreator} that enforces a {@link LazyInitTargetSource} for
* each bean that is defined as "lazy-init". This will lead to a proxy created for
* each of those beans, allowing to fetch a reference to such a bean without
* actually initializing the target bean instance.
*
* To be registered as custom {@code TargetSourceCreator} for an auto-proxy
* creator, in combination with custom interceptors for specific beans or for the
* creation of lazy-init proxies only. For example, as an autodetected
* infrastructure bean in an XML application context definition:
*
*
* <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">
* <property name="beanNames" value="*" /> <!-- apply to all beans -->
* <property name="customTargetSourceCreators">
* <list>
* <bean class="org.springframework.aop.framework.autoproxy.target.LazyInitTargetSourceCreator" />
* </list>
* </property>
* </bean>
*
* <bean id="myLazyInitBean" class="mypackage.MyBeanClass" lazy-init="true">
* <!-- ... -->
* </bean>
*
* @author Juergen Hoeller
* @author Sam Brannen
* @since 1.2
* @see org.springframework.beans.factory.config.BeanDefinition#isLazyInit
* @see org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator#setCustomTargetSourceCreators
* @see org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator
*/
public class LazyInitTargetSourceCreator extends AbstractBeanFactoryBasedTargetSourceCreator {
@Override
protected boolean isPrototypeBased() {
return false;
}
@Override
@Nullable
protected AbstractBeanFactoryBasedTargetSource createBeanFactoryBasedTargetSource(
Class beanClass, String beanName) {
if (getBeanFactory() instanceof ConfigurableListableBeanFactory) {
BeanDefinition definition =
((ConfigurableListableBeanFactory) getBeanFactory()).getBeanDefinition(beanName);
if (definition.isLazyInit()) {
return new LazyInitTargetSource();
}
}
return null;
}
}