Spring AOP

类关系图

• AopProxyFactory

public interface AopProxyFactory {

	/**
	 * Create an {@link AopProxy} for the given AOP configuration.
	 * @param config the AOP configuration in the form of an
	 * AdvisedSupport object
	 * @return the corresponding AOP proxy
	 * @throws AopConfigException if the configuration is invalid
	 */
	AopProxy createAopProxy(AdvisedSupport config) throws AopConfigException;

}

• DefaultAopProxyFactory

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.");
			}
      // 代理对象是接口 或者是 JDK Proxy 代理后的对象，则使用动态代理
			if (targetClass.isInterface() || Proxy.isProxyClass(targetClass)) {
				return new JdkDynamicAopProxy(config);
			}
      // 否则使用 Cglib（代码生成库）
			return new ObjenesisCglibAopProxy(config);
		}
		else {
			return new JdkDynamicAopProxy(config);
		}
	}
}