spring BeanFactoryRefreshableTargetSource 源码
spring BeanFactoryRefreshableTargetSource 代码
文件路径：/spring-aop/src/main/java/org/springframework/aop/target/dynamic/BeanFactoryRefreshableTargetSource.java
/*
* Copyright 2002-2012 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.target.dynamic;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.util.Assert;
/**
* Refreshable TargetSource that fetches fresh target beans from a BeanFactory.
*
* <p>Can be subclassed to override {@code requiresRefresh()} to suppress
* unnecessary refreshes. By default, a refresh will be performed every time
* the "refreshCheckDelay" has elapsed.
*
* @author Rob Harrop
* @author Rod Johnson
* @author Juergen Hoeller
* @author Mark Fisher
* @since 2.0
* @see org.springframework.beans.factory.BeanFactory
* @see #requiresRefresh()
* @see #setRefreshCheckDelay
*/
public class BeanFactoryRefreshableTargetSource extends AbstractRefreshableTargetSource {
private final BeanFactory beanFactory;
private final String beanName;
/**
* Create a new BeanFactoryRefreshableTargetSource for the given
* bean factory and bean name.
* <p>Note that the passed-in BeanFactory should have an appropriate
* bean definition set up for the given bean name.
* @param beanFactory the BeanFactory to fetch beans from
* @param beanName the name of the target bean
*/
public BeanFactoryRefreshableTargetSource(BeanFactory beanFactory, String beanName) {
Assert.notNull(beanFactory, "BeanFactory is required");
Assert.notNull(beanName, "Bean name is required");
this.beanFactory = beanFactory;
this.beanName = beanName;
}
/**
* Retrieve a fresh target object.
*/
@Override
protected final Object freshTarget() {
return this.obtainFreshBean(this.beanFactory, this.beanName);
}
/**
* A template method that subclasses may override to provide a
* fresh target object for the given bean factory and bean name.
* <p>This default implementation fetches a new target bean
* instance from the bean factory.
* @see org.springframework.beans.factory.BeanFactory#getBean
*/
protected Object obtainFreshBean(BeanFactory beanFactory, String beanName) {
return beanFactory.getBean(beanName);
}
}
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