Interface Interceptor

All Superinterfaces:

Advice

All Known Subinterfaces:

ConstructorInterceptor, IntroductionInterceptor, MethodInterceptor

All Known Implementing Classes:

AbstractMonitoringInterceptor, AbstractRetryInterceptor, AbstractTraceInterceptor, AfterReturningAdviceInterceptor, AnnotationAsyncExecutionInterceptor, AspectJAfterAdvice, AspectJAfterThrowingAdvice, AspectJAroundAdvice, AsyncExecutionInterceptor, CacheInterceptor, ConcurrencyThrottleInterceptor, CustomizableTraceInterceptor, DebugInterceptor, DelegatePerTargetObjectIntroductionInterceptor, DelegatingIntroductionInterceptor, EventPublicationInterceptor, ExposeInvocationInterceptor, JCacheInterceptor, MBeanClientInterceptor, MBeanProxyFactoryBean, MethodBeforeAdviceInterceptor, MethodValidationInterceptor, PerformanceMonitorInterceptor, PersistenceExceptionTranslationInterceptor, SimpleRetryInterceptor, SimpleTraceInterceptor, ThrowsAdviceInterceptor, TransactionInterceptor

public interface Interceptor
extends Advice

This interface represents a generic interceptor.

A generic interceptor can intercept runtime events that occur within a base program. Those events are materialized by (reified in) joinpoints. Runtime joinpoints can be invocations, field access, exceptions...

This interface is not used directly. Use the sub-interfaces to intercept specific events. For instance, the following class implements some specific interceptors in order to implement a debugger:

class DebuggingInterceptor implements MethodInterceptor,
    ConstructorInterceptor {

  Object invoke(MethodInvocation i) throws Throwable {
    debug(i.getMethod(), i.getThis(), i.getArgs());
    return i.proceed();
  }

  Object construct(ConstructorInvocation i) throws Throwable {
    debug(i.getConstructor(), i.getThis(), i.getArgs());
    return i.proceed();
  }

  void debug(AccessibleObject ao, Object this, Object value) {
    ...
  }
}

Author:

Rod Johnson

See Also:

• Joinpoint