Spring框架学习[AOP通知以及编程式AOP ] - JAVA

tPointcutAdvisor(advice); } } throw new UnknownAdviceTypeException(advice); } //获取通知器的通知 public MethodInterceptor[] getInterceptors(Advisor advisor) throws UnknownAdviceTypeException { List interceptors = new ArrayList (3); //通知通知器的通知 Advice advice = advisor.getAdvice(); //如果通知是方法拦截器类型，则不需要适配，直接添加到通知集合中 if (advice instanceof MethodInterceptor) { interceptors.add((MethodInterceptor) advice); } //对通知进行适配，从适配器中获取封装好AOP编制功能的拦截器 for (AdvisorAdapter adapter : this.adapters) { if (adapter.supportsAdvice(advice)) { interceptors.add(adapter.getInterceptor(advisor)); } } if (interceptors.isEmpty()) { throw new UnknownAdviceTypeException(advisor.getAdvice()); } return interceptors.toArray(new MethodInterceptor[interceptors.size()]); } //注册通知适配器 public void registerAdvisorAdapter(AdvisorAdapter adapter) { this.adapters.add(adapter); } }

public class DefaultAdvisorAdapterRegistry implements AdvisorAdapterRegistry, Serializable {	//持有通知适配器的集合	private final List<AdvisorAdapter> adapters = new ArrayList<AdvisorAdapter>(3);//构造方法，为通知适配器集合添加Spring的3种类型通知适配器	public DefaultAdvisorAdapterRegistry() {		registerAdvisorAdapter(new MethodBeforeAdviceAdapter());		registerAdvisorAdapter(new AfterReturningAdviceAdapter());		registerAdvisorAdapter(new ThrowsAdviceAdapter());	}	//将通知封装为通知器public Advisor wrap(Object adviceObject) throws UnknownAdviceTypeException {	//如果通知对象是通知器类型，则不用封装		if (adviceObject instanceof Advisor) {			return (Advisor) adviceObject;		}		if (!(adviceObject instanceof Advice)) {			throw new UnknownAdviceTypeException(adviceObject);		}		Advice advice = (Advice) adviceObject;		//如果通知是方法拦截器		if (advice instanceof MethodInterceptor) {			//将方法拦截器类型的通知封装为默认切入点通知器			return new DefaultPointcutAdvisor(advice);		}		for (AdvisorAdapter adapter : this.adapters) {			//检查通知适配器是否支持给定的通知			if (adapter.supportsAdvice(advice)) {				return new DefaultPointcutAdvisor(advice);			}		}		throw new UnknownAdviceTypeException(advice);	}	//获取通知器的通知	public MethodInterceptor[] getInterceptors(Advisor advisor) throws UnknownAdviceTypeException {		List<MethodInterceptor> interceptors = new ArrayList<MethodInterceptor>(3);		//通知通知器的通知		Advice advice = advisor.getAdvice();		//如果通知是方法拦截器类型，则不需要适配，直接添加到通知集合中		if (advice instanceof MethodInterceptor) {			interceptors.add((MethodInterceptor) advice);		}		//对通知进行适配，从适配器中获取封装好AOP编制功能的拦截器		for (AdvisorAdapter adapter : this.adapters) {			if (adapter.supportsAdvice(advice)) {				interceptors.add(adapter.getInterceptor(advisor));			}		}		if (interceptors.isEmpty()) {			throw new UnknownAdviceTypeException(advisor.getAdvice());		}		return interceptors.toArray(new MethodInterceptor[interceptors.size()]);	}	//注册通知适配器	public void registerAdvisorAdapter(AdvisorAdapter adapter) {		this.adapters.add(adapter);	}}

从上述代码获取通知源码分析中我们看到，DefaultAdvisorAdapterRegistry的getInterceptors方法中，需要将AOP配置的通知封装为通知适配器，下面我们继续分析通知适配器的主要源码和功能。

4.通知适配器：

通知适配器AdvisorAdapter对通知进行封装，为通知提供Spring AOP的增强功能，下面我们以MethodBeforeAdviceAdapter为例，分析通知适配器的具体功能：

(1).MethodBeforeAdviceAdapter源码：

[java] view plaincopyprint class MethodBeforeAdviceAdapter implements AdvisorAdapter, Serializable { //检查通知是否为通知适配器适配的通知类型 public boolean supportsAdvice(Advice advice) { return (advice instanceof MethodBeforeAdvice); } //获取通知拦截器 public

Spring框架学习[AOP通知以及编程式AOP ](六)