• Spring源码学习:DefaultAopProxyFactory


    /*
     * Copyright 2002-2015 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 java.lang.reflect.Proxy;
    
    import org.springframework.aop.SpringProxy;
    
    /**
     * 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 {@code optimize} flag is set
     * <li>the {@code proxyTargetClass} flag is set
     * <li>no proxy interfaces have been specified
     * </ul>
     *
     * <p>In general, specify {@code 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
     */
    @SuppressWarnings("serial")
    public class DefaultAopProxyFactory implements AopProxyFactory, Serializable {
    
        @Override
        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() || Proxy.isProxyClass(targetClass)) {
                    return new JdkDynamicAopProxy(config);
                }
                return new ObjenesisCglibAopProxy(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<?>[] ifcs = config.getProxiedInterfaces();
            return (ifcs.length == 0 || (ifcs.length == 1 && SpringProxy.class.isAssignableFrom(ifcs[0])));
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/rgqancy/p/8066935.html
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