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spring aop探寻之After Advice

 
阅读更多

前一篇 spring aop探寻之Before Advice

http://hehaibo.iteye.com/admin/blogs/1836392

 

首先来看个错误

org.springframework.aop.framework.adapter.UnknownAdviceTypeException: Advice object [com.hhb.biap.interceptor.after.InvokeLogAterAdvice@c59ad5] is neither a supported subinterface of [org.aopalliance.aop.Advice] nor an [org.springframework.aop.Advisor]
	at org.springframework.aop.framework.adapter.DefaultAdvisorAdapterRegistry.getInterceptors(DefaultAdvisorAdapterRegistry.java:90)
	at org.springframework.aop.framework.DefaultAdvisorChainFactory.getInterceptorsAndDynamicInterceptionAdvice(DefaultAdvisorChainFactory.java:61)
	at org.springframework.aop.framework.AdvisedSupport.getInterceptorsAndDynamicInterceptionAdvice(AdvisedSupport.java:465)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:190)
	at $Proxy13.toString(Unknown Source)
	at java.lang.String.valueOf(String.java:2826)
	at java.lang.StringBuilder.append(StringBuilder.java:115)
	at com.hhb.biap.interceptor.test.InvokeRecordBeforeAdviceTest.testBeforeInterceptor(InvokeRecordBeforeAdviceTest.java:30)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.springframework.test.context.junit4.SpringTestMethod.invoke(SpringTestMethod.java:160)
	at org.springframework.test.context.junit4.SpringMethodRoadie.runTestMethod(SpringMethodRoadie.java:233)
	at org.springframework.test.context.junit4.SpringMethodRoadie$RunBeforesThenTestThenAfters.run(SpringMethodRoadie.java:333)
	at org.springframework.test.context.junit4.SpringMethodRoadie.runWithRepetitions(SpringMethodRoadie.java:217)
	at org.springframework.test.context.junit4.SpringMethodRoadie.runTest(SpringMethodRoadie.java:197)
	at org.springframework.test.context.junit4.SpringMethodRoadie.run(SpringMethodRoadie.java:143)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.invokeTestMethod(SpringJUnit4ClassRunner.java:160)
	at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
	at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
	at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
	at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
	at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:97)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

  我们看下测试代码

public void testBeforeInterceptor() {
		//获得容器中的bean对象
		BiapAppServiceImpl biapAppService = (BiapAppServiceImpl) this.applicationContext
				.getBean("biapAppService");
		System.out.println(biapAppService);
		// 创建代理工厂
		ProxyFactory proxyFactory = new ProxyFactory();
//		proxyFactory.setOptimize(Boolean.TRUE);
//		proxyFactory.setProxyTargetClass(Boolean.TRUE);
		proxyFactory.setInterfaces(new Class[]{BiapAppService.class});
		proxyFactory.setTarget(biapAppService);
		proxyFactory.addAdvice(new InvokeRecordBeforeAdvice());
		proxyFactory.addAdvice(new InvokeLogAterAdvice());
		BiapAppService proxyBiapAppService = (BiapAppService) proxyFactory
				.getProxy();
//		System.out.println("代理对象:"+ proxyBiapAppService);
		BiapApp biapApp = proxyBiapAppService.getBiapAppById("biap");
		System.out.println(biapApp);
	}

 在看下这个类的代码com.hhb.biap.interceptor.after.InvokeLogAterAdvice,我想实现的调用方法后的增强

 

import java.lang.reflect.Method;

import org.aopalliance.aop.Advice;

public class InvokeLogAterAdvice implements Advice{

	public void afterReturning(Object returnValue, Method method,
			Object[] args, Object target) throws Throwable {
		// TODO Auto-generated method stub
	}
}

 因为我实现是aop联盟的定义的接口,而spring对aop已经有了实现,

 

import org.aopalliance.aop.Advice;

public interface AfterAdvice extends Advice {

}
public interface AfterReturningAdvice extends AfterAdvice {
	void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable;

}

 但是为什么还会出现

 

org.springframework.aop.framework.adapter.UnknownAdviceTypeException: Advice object [com.hhb.biap.interceptor.after.InvokeLogAterAdvice@c59ad5] is neither a supported subinterface of [org.aopalliance.aop.Advice] nor an [org.springframework.aop.Advisor]

 原来是spring实现捣的鬼,因为spring默认启动注册了一个注册器,如果我们用aop的话就被这个注册器拦截到,我们来看下JdkDynamicAopProxy ,这个类我们很熟悉

 

final class JdkDynamicAopProxy implements AopProxy, InvocationHandler, Serializable {

public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
		MethodInvocation invocation = null;
		Object oldProxy = null;
		boolean setProxyContext = false;

		TargetSource targetSource = this.advised.targetSource;
		Class targetClass = null;
		Object target = null;

		try {
			if (!this.equalsDefined && AopUtils.isEqualsMethod(method)) {
				// The target does not implement the equals(Object) method itself.
				return (equals(args[0]) ? Boolean.TRUE : Boolean.FALSE);
			}
			if (!this.hashCodeDefined && AopUtils.isHashCodeMethod(method)) {
				// The target does not implement the hashCode() method itself.
				return new Integer(hashCode());
			}
			if (!this.advised.opaque && method.getDeclaringClass().isInterface() &&
					method.getDeclaringClass().isAssignableFrom(Advised.class)) {
				// Service invocations on ProxyConfig with the proxy config...
				return AopUtils.invokeJoinpointUsingReflection(this.advised, method, args);
			}

			Object retVal = null;

			if (this.advised.exposeProxy) {
				// Make invocation available if necessary.
				oldProxy = AopContext.setCurrentProxy(proxy);
				setProxyContext = true;
			}

			// May be <code>null</code>. Get as late as possible to minimize the time we "own" the target,
			// in case it comes from a pool.
			target = targetSource.getTarget();
			if (target != null) {
				targetClass = target.getClass();
			}

			// Get the interception chain for this method.
			List chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);

			// Check whether we have any advice. If we don't, we can fallback on direct
			// reflective invocation of the target, and avoid creating a MethodInvocation.
			if (chain.isEmpty()) {
				// We can skip creating a MethodInvocation: just invoke the target directly
				// Note that the final invoker must be an InvokerInterceptor so we know it does
				// nothing but a reflective operation on the target, and no hot swapping or fancy proxying.
				retVal = AopUtils.invokeJoinpointUsingReflection(target, method, args);
			}
			else {
				// We need to create a method invocation...
				invocation = new ReflectiveMethodInvocation(proxy, target, method, args, targetClass, chain);
				// Proceed to the joinpoint through the interceptor chain.
				retVal = invocation.proceed();
			}

			// Massage return value if necessary.
			if (retVal != null && retVal == target && method.getReturnType().isInstance(proxy) &&
					!RawTargetAccess.class.isAssignableFrom(method.getDeclaringClass())) {
				// Special case: it returned "this" and the return type of the method
				// is type-compatible. Note that we can't help if the target sets
				// a reference to itself in another returned object.
				retVal = proxy;
			}
			return retVal;
		}
		finally {
			if (target != null && !targetSource.isStatic()) {
				// Must have come from TargetSource.
				targetSource.releaseTarget(target);
			}
			if (setProxyContext) {
				// Restore old proxy.
				AopContext.setCurrentProxy(oldProxy);
			}
		}
	}、
}

 我们来看看这行代码

 

List chain = this.advised.getInterceptorsAndDynamicInterceptionAdvice(method, targetClass);

 在这个AdvisedSupport 里面

public class AdvisedSupport extends ProxyConfig implements Advised {
 /**
	 * Determine a list of {@link org.aopalliance.intercept.MethodInterceptor} objects
	 * for the given method, based on this configuration.
	 * @param method the proxied method
	 * @param targetClass the target class
	 * @return List of MethodInterceptors (may also include InterceptorAndDynamicMethodMatchers)
	 */
	public List getInterceptorsAndDynamicInterceptionAdvice(Method method, Class targetClass) {
		MethodCacheKey cacheKey = new MethodCacheKey(method);
		List cached = (List) this.methodCache.get(cacheKey);
		if (cached == null) {
			cached = this.advisorChainFactory.getInterceptorsAndDynamicInterceptionAdvice(
					this, method, targetClass);
			this.methodCache.put(cacheKey, cached);
		}
		return cached;
	}
}

 我们再看 这行代码

cached = this.advisorChainFactory.getInterceptorsAndDynamicInterceptionAdvice(
 this, method, targetClass);

 接着往下看

public class DefaultAdvisorChainFactory implements AdvisorChainFactory, Serializable {

	public List getInterceptorsAndDynamicInterceptionAdvice(Advised config, Method method, Class targetClass) {
		// This is somewhat tricky... we have to process introductions first,
		// but we need to preserve order in the ultimate list.
		List interceptorList = new ArrayList(config.getAdvisors().length);
		boolean hasIntroductions = hasMatchingIntroductions(config, targetClass);
		AdvisorAdapterRegistry registry = GlobalAdvisorAdapterRegistry.getInstance();
		Advisor[] advisors = config.getAdvisors();
		for (int i = 0; i < advisors.length; i++) {
			Advisor advisor = advisors[i];
			if (advisor instanceof PointcutAdvisor) {
				// Add it conditionally.
				PointcutAdvisor pointcutAdvisor = (PointcutAdvisor) advisor;
				if (config.isPreFiltered() || pointcutAdvisor.getPointcut().getClassFilter().matches(targetClass)) {
					//注意这行代码
					MethodInterceptor[] interceptors = registry.getInterceptors(advisor);
					MethodMatcher mm = pointcutAdvisor.getPointcut().getMethodMatcher();
					if (MethodMatchers.matches(mm, method, targetClass, hasIntroductions)) {
						if (mm.isRuntime()) {
							// Creating a new object instance in the getInterceptors() method
							// isn't a problem as we normally cache created chains.
							for (int j = 0; j < interceptors.length; j++) {
								interceptorList.add(new InterceptorAndDynamicMethodMatcher(interceptors[j], mm));
							}
						}
						else {
							interceptorList.addAll(Arrays.asList(interceptors));
						}
					}
				}
			}
			else if (advisor instanceof IntroductionAdvisor) {
				IntroductionAdvisor ia = (IntroductionAdvisor) advisor;
				if (config.isPreFiltered() || ia.getClassFilter().matches(targetClass)) {
					Interceptor[] interceptors = registry.getInterceptors(advisor);
					interceptorList.addAll(Arrays.asList(interceptors));
				}
			}
			else {
				Interceptor[] interceptors = registry.getInterceptors(advisor);
				interceptorList.addAll(Arrays.asList(interceptors));
			}
		}
		return interceptorList;
	}

	/**
	 * Determine whether the Advisors contain matching introductions.
	 */
	private static boolean hasMatchingIntroductions(Advised config, Class targetClass) {
		for (int i = 0; i < config.getAdvisors().length; i++) {
			Advisor advisor = config.getAdvisors()[i];
			if (advisor instanceof IntroductionAdvisor) {
				IntroductionAdvisor ia = (IntroductionAdvisor) advisor;
				if (ia.getClassFilter().matches(targetClass)) {
					return true;
				}
			}
		}
		return false;
	}

}

 我们再看这寒代码

		AdvisorAdapterRegistry registry = GlobalAdvisorAdapterRegistry.getInstance();

 

public abstract class GlobalAdvisorAdapterRegistry {

	/**
	 * Keep track of a single instance so we can return it to classes that request it.
	 */
	private static final AdvisorAdapterRegistry instance = new DefaultAdvisorAdapterRegistry();
	
	/**
	 * Return the singleton DefaultAdvisorAdapterRegistry instance.
	 */
	public static AdvisorAdapterRegistry getInstance() {
		return instance;
	}

}

 我们再看DefaultAdvisorAdapterRegistry类的构造函

public class DefaultAdvisorAdapterRegistry implements AdvisorAdapterRegistry, Serializable {

	private final List adapters = new ArrayList(3);


	/**
	 * Create a new DefaultAdvisorAdapterRegistry, registering well-known adapters.
	 */
	public DefaultAdvisorAdapterRegistry() {
		//原来注册了3个适配器
		registerAdvisorAdapter(new MethodBeforeAdviceAdapter());
		registerAdvisorAdapter(new AfterReturningAdviceAdapter());
		registerAdvisorAdapter(new ThrowsAdviceAdapter());
	}


	public Advisor wrap(Object adviceObject) throws UnknownAdviceTypeException {
		if (adviceObject instanceof Advisor) {
			return (Advisor) adviceObject;
		}
		if (!(adviceObject instanceof Advice)) {
			throw new UnknownAdviceTypeException(adviceObject);
		}
		Advice advice = (Advice) adviceObject;
		if (advice instanceof MethodInterceptor) {
			// So well-known it doesn't even need an adapter.
			return new DefaultPointcutAdvisor(advice);
		}
		for (int i = 0; i < this.adapters.size(); i++) {
			// Check that it is supported.
			AdvisorAdapter adapter = (AdvisorAdapter) this.adapters.get(i);
			if (adapter.supportsAdvice(advice)) {
				return new DefaultPointcutAdvisor(advice);
			}
		}
		throw new UnknownAdviceTypeException(advice);
	}

	public MethodInterceptor[] getInterceptors(Advisor advisor) throws UnknownAdviceTypeException {
		List interceptors = new ArrayList(3);
		Advice advice = advisor.getAdvice();
		if (advice instanceof MethodInterceptor) {
			interceptors.add(advice);
		}
		for (int i = 0; i < this.adapters.size(); i++) {
			AdvisorAdapter adapter = (AdvisorAdapter) this.adapters.get(i);
			if (adapter.supportsAdvice(advice)) {
				interceptors.add(adapter.getInterceptor(advisor));
			}
		}
		if (interceptors.isEmpty()) {
			throw new UnknownAdviceTypeException(advisor.getAdvice());
		}
		return (MethodInterceptor[]) interceptors.toArray(new MethodInterceptor[interceptors.size()]);
	}

	public void registerAdvisorAdapter(AdvisorAdapter adapter) {
		this.adapters.add(adapter);
	}

}

 原来问题就在这里,spring 在DefaultAdvisorAdapterRegistry 构造函数里面注册了三个适配器

 

class MethodBeforeAdviceAdapter implements AdvisorAdapter, Serializable {

	public boolean supportsAdvice(Advice advice) {
		return (advice instanceof MethodBeforeAdvice);
	}

	public MethodInterceptor getInterceptor(Advisor advisor) {
		MethodBeforeAdvice advice = (MethodBeforeAdvice) advisor.getAdvice();
		return new MethodBeforeAdviceInterceptor(advice);
	}

}

 

class AfterReturningAdviceAdapter implements AdvisorAdapter, Serializable {

	public boolean supportsAdvice(Advice advice) {
		return (advice instanceof AfterReturningAdvice);
	}

	public MethodInterceptor getInterceptor(Advisor advisor) {
		AfterReturningAdvice advice = (AfterReturningAdvice) advisor.getAdvice();
		return new AfterReturningAdviceInterceptor(advice);
	}

}

  

class ThrowsAdviceAdapter implements AdvisorAdapter, Serializable {

	public boolean supportsAdvice(Advice advice) {
		return (advice instanceof ThrowsAdvice);
	}

	public MethodInterceptor getInterceptor(Advisor advisor) {
		return new ThrowsAdviceInterceptor(advisor.getAdvice());
	}

}

 

我想我们看到这个类图就清楚了。

接下来我们再看DefaultAdvisorChainFactory 类中的这行代码

MethodInterceptor[] interceptors = registry.getInterceptors(advisor);

 这个返回的是

org.aopalliance.intercept.MethodInterceptor

 从上面贴代码我们就可以看出 所谓的MethodBeforeAdvice,AfterReturningAdvice,ThrowsAdviceInterceptor都是MethodInterceptor的子类!

public class MethodBeforeAdviceInterceptor implements MethodInterceptor, Serializable {

	private MethodBeforeAdvice advice;


	/**
	 * Create a new MethodBeforeAdviceInterceptor for the given advice.
	 * @param advice the MethodBeforeAdvice to wrap
	 */
	public MethodBeforeAdviceInterceptor(MethodBeforeAdvice advice) {
		Assert.notNull(advice, "Advice must not be null");
		this.advice = advice;
	}

	public Object invoke(MethodInvocation mi) throws Throwable {
		this.advice.before(mi.getMethod(), mi.getArguments(), mi.getThis() );
		return mi.proceed();
	}

}

 

public class AfterReturningAdviceInterceptor implements MethodInterceptor, AfterAdvice, Serializable {

	private final AfterReturningAdvice advice;


	/**
	 * Create a new AfterReturningAdviceInterceptor for the given advice.
	 * @param advice the AfterReturningAdvice to wrap
	 */
	public AfterReturningAdviceInterceptor(AfterReturningAdvice advice) {
		Assert.notNull(advice, "Advice must not be null");
		this.advice = advice;
	}

	public Object invoke(MethodInvocation mi) throws Throwable {
		Object retVal = mi.proceed();
		this.advice.afterReturning(retVal, mi.getMethod(), mi.getArguments(), mi.getThis());
		return retVal;
	}

}

 

public class ThrowsAdviceInterceptor implements MethodInterceptor, AfterAdvice {

	private static final String AFTER_THROWING = "afterThrowing";

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


	private final Object throwsAdvice;

	/** Methods on throws advice, keyed by exception class */
	private final Map exceptionHandlerMap = new HashMap();


	/**
	 * Create a new ThrowsAdviceInterceptor for the given ThrowsAdvice.
	 * @param throwsAdvice the advice object that defines the exception
	 * handler methods (usually a {@link org.springframework.aop.ThrowsAdvice}
	 * implementation)
	 */
	public ThrowsAdviceInterceptor(Object throwsAdvice) {
		Assert.notNull(throwsAdvice, "Advice must not be null");
		this.throwsAdvice = throwsAdvice;

		Method[] methods = throwsAdvice.getClass().getMethods();
		for (int i = 0; i < methods.length; i++) {
			Method method = methods[i];
			if (method.getName().equals(AFTER_THROWING) &&
					//m.getReturnType() == null &&
					(method.getParameterTypes().length == 1 || method.getParameterTypes().length == 4) &&
					Throwable.class.isAssignableFrom(method.getParameterTypes()[method.getParameterTypes().length - 1])
				) {
				// Have an exception handler
				this.exceptionHandlerMap.put(method.getParameterTypes()[method.getParameterTypes().length - 1], method);
				if (logger.isDebugEnabled()) {
					logger.debug("Found exception handler method: " + method);
				}
			}
		}
		
		if (this.exceptionHandlerMap.isEmpty()) {
			throw new IllegalArgumentException(
					"At least one handler method must be found in class [" + throwsAdvice.getClass() + "]");
		}
	}
	
	public int getHandlerMethodCount() {
		return this.exceptionHandlerMap.size();
	}

	/**
	 * Determine the exception handle method. Can return null if not found.
	 * @param exception the exception thrown
	 * @return a handler for the given exception type
	 */
	private Method getExceptionHandler(Throwable exception) {
		Class exceptionClass = exception.getClass();
		if (logger.isTraceEnabled()) {
			logger.trace("Trying to find handler for exception of type [" + exceptionClass.getName() + "]");
		}
		Method handler = (Method) this.exceptionHandlerMap.get(exceptionClass);
		while (handler == null && !exceptionClass.equals(Throwable.class)) {
			exceptionClass = exceptionClass.getSuperclass();
			handler = (Method) this.exceptionHandlerMap.get(exceptionClass);
		}
		if (handler != null && logger.isDebugEnabled()) {
			logger.debug("Found handler for exception of type [" + exceptionClass.getName() + "]: " + handler);
		}
		return handler;
	}

	public Object invoke(MethodInvocation mi) throws Throwable {
		try {
			return mi.proceed();
		}
		catch (Throwable ex) {
			Method handlerMethod = getExceptionHandler(ex);
			if (handlerMethod != null) {
				invokeHandlerMethod(mi, ex, handlerMethod);
			}
			throw ex;
		}
	}
	
	private void invokeHandlerMethod(MethodInvocation mi, Throwable ex, Method method) throws Throwable {
		Object[] handlerArgs;
		if (method.getParameterTypes().length == 1) {
			handlerArgs = new Object[] { ex };
		}
		else {
			handlerArgs = new Object[] {mi.getMethod(), mi.getArguments(), mi.getThis(), ex};
		}
		try {
			method.invoke(this.throwsAdvice, handlerArgs);
		}
		catch (InvocationTargetException targetEx) {
			throw targetEx.getTargetException();
		}
	}

}

 因为我定义这个类

public class InvokeLogAterAdvice implements AfterReturningAdvice{

	public void afterReturning(Object returnValue, Method method,
			Object[] args, Object target) throws Throwable {
		// TODO Auto-generated method stub
	}
}

 spring的适配器都匹配不到,所有救抛出了

org.springframework.aop.framework.adapter.UnknownAdviceTypeException: Advice object [com.hhb.biap.interceptor.after.InvokeLogAterAdvice@c59ad5] is neither a supported subinterface of [org.aopalliance.aop.Advice] nor an [org.springframework.aop.Advisor]

 spring真精妙~

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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