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Spring Framework example source code file (DefaultAopProxyFactory.java)

This example Spring Framework source code file (DefaultAopProxyFactory.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

add, aopconfigexception, aopconfigexception, aopproxy, aopproxy, cglib2, cglibproxyfactory, class, class, defaultaopproxyfactory, either, io, jdkdynamicaopproxy, jdkdynamicaopproxy, targetsource

The Spring Framework DefaultAopProxyFactory.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;

import java.io.Serializable;

import org.springframework.aop.SpringProxy;
import org.springframework.util.ClassUtils;

/**
 * Default {@link AopProxyFactory} implementation,
 * creating either a CGLIB proxy or a JDK dynamic proxy.
 *
 * <p>Creates a CGLIB proxy if one the following is true
 * for a given {@link AdvisedSupport} instance:
 * <ul>
 * <li>the "optimize" flag is set
 * <li>the "proxyTargetClass" flag is set
 * <li>no proxy interfaces have been specified
 * </ul>
 *
 * <p>Note that the CGLIB library classes have to be present on
 * the class path if an actual CGLIB proxy needs to be created.
 *
 * <p>In general, specify "proxyTargetClass" to enforce a CGLIB proxy,
 * or specify one or more interfaces to use a JDK dynamic proxy.
 *
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @since 12.03.2004
 * @see AdvisedSupport#setOptimize
 * @see AdvisedSupport#setProxyTargetClass
 * @see AdvisedSupport#setInterfaces
 */
public class DefaultAopProxyFactory implements AopProxyFactory, Serializable {

	/** Whether the CGLIB2 library is present on the classpath */
	private static final boolean cglibAvailable =
			ClassUtils.isPresent("net.sf.cglib.proxy.Enhancer", DefaultAopProxyFactory.class.getClassLoader());


	public AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException {
		if (config.isOptimize() || config.isProxyTargetClass() || hasNoUserSuppliedProxyInterfaces(config)) {
			Class targetClass = config.getTargetClass();
			if (targetClass == null) {
				throw new AopConfigException("TargetSource cannot determine target class: " +
						"Either an interface or a target is required for proxy creation.");
			}
			if (targetClass.isInterface()) {
				return new JdkDynamicAopProxy(config);
			}
			if (!cglibAvailable) {
				throw new AopConfigException(
						"Cannot proxy target class because CGLIB2 is not available. " +
						"Add CGLIB to the class path or specify proxy interfaces.");
			}
			return CglibProxyFactory.createCglibProxy(config);
		}
		else {
			return new JdkDynamicAopProxy(config);
		}
	}

	/**
	 * Determine whether the supplied {@link AdvisedSupport} has only the
	 * {@link org.springframework.aop.SpringProxy} interface specified
	 * (or no proxy interfaces specified at all).
	 */
	private boolean hasNoUserSuppliedProxyInterfaces(AdvisedSupport config) {
		Class[] interfaces = config.getProxiedInterfaces();
		return (interfaces.length == 0 || (interfaces.length == 1 && SpringProxy.class.equals(interfaces[0])));
	}


	/**
	 * Inner factory class used to just introduce a CGLIB2 dependency
	 * when actually creating a CGLIB proxy.
	 */
	private static class CglibProxyFactory {

		public static AopProxy createCglibProxy(AdvisedSupport advisedSupport) {
			return new Cglib2AopProxy(advisedSupport);
		}
	}

}

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