org.aopalliance.intercept.Interceptor |
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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 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, FieldInterceptor {
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();
}
Object get(FieldAccess fa) throws Throwable {
debug(fa.getField(), fa.getThis(), null);
return fa.proceed();
}
Object set(FieldAccess fa) throws Throwable {
debug(fa.getField(), fa.getThis(), fa.getValueToSet());
return fa.proceed();
}
void debug(AccessibleObject ao, Object this, Object value) {
...
}
}