- Spring AOP使用教程及代碼詳講

//檢查當前advisor的pointcut是否可以匹配當前方法??

MethodMatcher?mm?=pointcutAdvisor.getPointcut().getMethodMatcher(); ?

if?(MethodMatchers.matches(mm,method,?targetClass,?hasIntroductions))?{??

if(mm.isRuntime())?{??

//?Creating?a?newobject?instance?in?the?getInterceptors()?method??

//?isn't?a?problemas?we?normally?cache?created?chains.??

for?(intj?=?0;?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;??

} ?

這個方法執(zhí)行完成后，Advised中配置能夠應用到連接點或者目標類的Advisor全部被轉(zhuǎn)化成了MethodInterceptor.

接下來我們再看下得到的攔截器鏈是怎么起作用的。

if?(chain.isEmpty())?{??

retVal?=?AopUtils.invokeJoinpointUsingReflection(target,method,?args);??

}?else?{??

//創(chuàng)建MethodInvocation??

invocation?=?newReflectiveMethodInvocation(proxy,?target,?method,?args,?targetClass,?chain);??

retVal?=?invocation.proceed();??

} ?