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Spring Framework example source code file (AbstractAdvisorAutoProxyCreator.java)

This example Spring Framework source code file (AbstractAdvisorAutoProxyCreator.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

abstractadvisorautoproxycreator, advisorautoproxycreator, beanfactoryadvisorretrievalhelper, beanfactoryadvisorretrievalhelperadapter, beanfactoryadvisorretrievalhelperadapter, configurablelistablebeanfactory, configurablelistablebeanfactory, list, list, object, ordercomparator, string, string, targetsource, util

The Spring Framework AbstractAdvisorAutoProxyCreator.java source code

/*
 * Copyright 2002-2007 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.framework.autoproxy;

import java.util.Collections;
import java.util.List;

import org.springframework.aop.TargetSource;
import org.springframework.aop.support.AopUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.core.OrderComparator;

/**
 * Generic auto proxy creator that builds AOP proxies for specific beans
 * based on detected Advisors for each bean.
 *
 * <p>Subclasses must implement the abstract {@link #findCandidateAdvisors()}
 * method to return a list of Advisors applying to any object. Subclasses can
 * also override the inherited {@link #shouldSkip} method to exclude certain
 * objects from auto-proxying.
 *
 * <p>Advisors or advices requiring ordering should implement the
 * {@link org.springframework.core.Ordered} interface. This class sorts
 * Advisors by Ordered order value. Advisors that don't implement the
 * Ordered interface will be considered as unordered; they will appear
 * at the end of the advisor chain in undefined order.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @see #findCandidateAdvisors
 */
public abstract class AbstractAdvisorAutoProxyCreator extends AbstractAutoProxyCreator {

	private BeanFactoryAdvisorRetrievalHelper advisorRetrievalHelper;


	public void setBeanFactory(BeanFactory beanFactory) {
		super.setBeanFactory(beanFactory);
		if (!(beanFactory instanceof ConfigurableListableBeanFactory)) {
			throw new IllegalStateException("Cannot use AdvisorAutoProxyCreator without a ConfigurableListableBeanFactory");
		}
		initBeanFactory((ConfigurableListableBeanFactory) beanFactory);
	}

	protected void initBeanFactory(ConfigurableListableBeanFactory beanFactory) {
		this.advisorRetrievalHelper = new BeanFactoryAdvisorRetrievalHelperAdapter(beanFactory);
	}


	protected Object[] getAdvicesAndAdvisorsForBean(Class beanClass, String beanName, TargetSource targetSource) {
		List advisors = findEligibleAdvisors(beanClass, beanName);
		if (advisors.isEmpty()) {
			return DO_NOT_PROXY;
		}
		return advisors.toArray();
	}

	/**
	 * Find all eligible Advisors for auto-proxying this class.
	 * @param beanClass the clazz to find advisors for
	 * @param beanName the name of the currently proxied bean
	 * @return the empty List, not <code>null,
	 * if there are no pointcuts or interceptors
	 * @see #findCandidateAdvisors
	 * @see #sortAdvisors
	 * @see #extendAdvisors
	 */
	protected List findEligibleAdvisors(Class beanClass, String beanName) {
		List candidateAdvisors = findCandidateAdvisors();
		List eligibleAdvisors = findAdvisorsThatCanApply(candidateAdvisors, beanClass, beanName);
		if (!eligibleAdvisors.isEmpty()) {
			eligibleAdvisors = sortAdvisors(eligibleAdvisors);
		}
		extendAdvisors(eligibleAdvisors);
		return eligibleAdvisors;
	}

	/**
	 * Find all candidate Advisors to use in auto-proxying.
	 * @return the List of candidate Advisors
	 */
	protected List findCandidateAdvisors() {
		return this.advisorRetrievalHelper.findAdvisorBeans();
	}

	/**
	 * Search the given candidate Advisors to find all Advisors that
	 * can apply to the specified bean.
	 * @param candidateAdvisors the candidate Advisors
	 * @param beanClass the target's bean class
	 * @param beanName the target's bean name
	 * @return the List of applicable Advisors
	 * @see ProxyCreationContext#getCurrentProxiedBeanName()
	 */
	protected List findAdvisorsThatCanApply(List candidateAdvisors, Class beanClass, String beanName) {
		ProxyCreationContext.setCurrentProxiedBeanName(beanName);
		try {
			return AopUtils.findAdvisorsThatCanApply(candidateAdvisors, beanClass);
		}
		finally {
			ProxyCreationContext.setCurrentProxiedBeanName(null);
		}
	}

	/**
	 * Return whether the Advisor bean with the given name is eligible
	 * for proxying in the first place.
	 * @param beanName the name of the Advisor bean
	 * @return whether the bean is eligible
	 */
	protected boolean isEligibleAdvisorBean(String beanName) {
		return true;
	}

	/**
	 * Sort advisors based on ordering. Subclasses may choose to override this
	 * method to customize the sorting strategy.
	 * @param advisors the source List of Advisors
	 * @return the sorted List of Advisors
	 * @see org.springframework.core.Ordered
	 * @see org.springframework.core.OrderComparator
	 */
	protected List sortAdvisors(List advisors) {
		Collections.sort(advisors, new OrderComparator());
		return advisors;
	}

	/**
	 * Extension hook that subclasses can override to register additional Advisors,
	 * given the sorted Advisors obtained to date.
	 * <p>The default implementation is empty.
	 * <p>Typically used to add Advisors that expose contextual information
	 * required by some of the later advisors.
	 * @param candidateAdvisors Advisors that have already been identified as
	 * applying to a given bean
	 */
	protected void extendAdvisors(List candidateAdvisors) {
	}

	/**
	 * This auto-proxy creator always returns pre-filtered Advisors.
	 */
	protected boolean advisorsPreFiltered() {
		return true;
	}


	/**
	 * Subclass of BeanFactoryAdvisorRetrievalHelper that delegates to
	 * surrounding AbstractAdvisorAutoProxyCreator facilities.
	 */
	private class BeanFactoryAdvisorRetrievalHelperAdapter extends BeanFactoryAdvisorRetrievalHelper {

		public BeanFactoryAdvisorRetrievalHelperAdapter(ConfigurableListableBeanFactory beanFactory) {
			super(beanFactory);
		}

		protected boolean isEligibleBean(String beanName) {
			return AbstractAdvisorAutoProxyCreator.this.isEligibleAdvisorBean(beanName);
		}
	}

}

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