Spring Framework example source code file (BeanFactoryRefreshableTargetSource.java)

This example Spring Framework source code file (BeanFactoryRefreshableTargetSource.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Spring Framework tags/keywords

abstractrefreshabletargetsource, bean, beanfactory, beanfactory, beanfactoryrefreshabletargetsource, beanfactoryrefreshabletargetsource, object, object, string, string

The Spring Framework BeanFactoryRefreshableTargetSource.java source code

/*
 * Copyright 2002-2006 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
 *
 *      http://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 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.
	 */
	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);
	}

}