spring ObjenesisCglibAopProxy 源码

spring ObjenesisCglibAopProxy 代码

文件路径：/spring-aop/src/main/java/org/springframework/aop/framework/ObjenesisCglibAopProxy.java

/*
 * Copyright 2002-2019 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;

import java.lang.reflect.Constructor;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.cglib.proxy.Callback;
import org.springframework.cglib.proxy.Enhancer;
import org.springframework.cglib.proxy.Factory;
import org.springframework.objenesis.SpringObjenesis;
import org.springframework.util.ReflectionUtils;

/**
 * Objenesis-based extension of {@link CglibAopProxy} to create proxy instances
 * without invoking the constructor of the class. Used by default as of Spring 4.
 *
 * @author Oliver Gierke
 * @author Juergen Hoeller
 * @since 4.0
 */
@SuppressWarnings("serial")
class ObjenesisCglibAopProxy extends CglibAopProxy {

	private static final Log logger = LogFactory.getLog(ObjenesisCglibAopProxy.class);

	private static final SpringObjenesis objenesis = new SpringObjenesis();


	/**
	 * Create a new ObjenesisCglibAopProxy for the given AOP configuration.
	 * @param config the AOP configuration as AdvisedSupport object
	 */
	public ObjenesisCglibAopProxy(AdvisedSupport config) {
		super(config);
	}


	@Override
	protected Object createProxyClassAndInstance(Enhancer enhancer, Callback[] callbacks) {
		Class<?> proxyClass = enhancer.createClass();
		Object proxyInstance = null;

		if (objenesis.isWorthTrying()) {
			try {
				proxyInstance = objenesis.newInstance(proxyClass, enhancer.getUseCache());
			}
			catch (Throwable ex) {
				logger.debug("Unable to instantiate proxy using Objenesis, " +
						"falling back to regular proxy construction", ex);
			}
		}

		if (proxyInstance == null) {
			// Regular instantiation via default constructor...
			try {
				Constructor<?> ctor = (this.constructorArgs != null ?
						proxyClass.getDeclaredConstructor(this.constructorArgTypes) :
						proxyClass.getDeclaredConstructor());
				ReflectionUtils.makeAccessible(ctor);
				proxyInstance = (this.constructorArgs != null ?
						ctor.newInstance(this.constructorArgs) : ctor.newInstance());
			}
			catch (Throwable ex) {
				throw new AopConfigException("Unable to instantiate proxy using Objenesis, " +
						"and regular proxy instantiation via default constructor fails as well", ex);
			}
		}

		((Factory) proxyInstance).setCallbacks(callbacks);
		return proxyInstance;
	}

}

相关信息

spring 源码目录

相关文章

spring AbstractAdvisingBeanPostProcessor 源码

spring AbstractSingletonProxyFactoryBean 源码

spring Advised 源码

spring AdvisedSupport 源码

spring AdvisedSupportListener 源码

spring AdvisorChainFactory 源码

spring AopConfigException 源码

spring AopContext 源码

spring AopInfrastructureBean 源码

spring AopProxy 源码