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;
}
}
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