org.springframework.aop.framework.ObjenesisCglibAopProxy.java Source code

Introduction

Here is the source code for org.springframework.aop.framework.ObjenesisCglibAopProxy.java

Source

/*
 * Copyright 2002-2016 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.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.
 *
 * @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
    @SuppressWarnings("unchecked")
    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;
    }

}