Package org.aopalliance.intercept
Interface ConstructorInterceptor
- All Superinterfaces:
Advice
,Interceptor
public interface ConstructorInterceptor extends Interceptor
Intercepts the construction of a new object.The user should implement the
construct(ConstructorInvocation)
method to modify the original behavior. E.g. the following class implements a singleton interceptor (allows only one unique instance for the intercepted class):class DebuggingInterceptor implements ConstructorInterceptor { Object instance=null; Object construct(ConstructorInvocation i) throws Throwable { if(instance==null) { return instance=i.proceed(); } else { throw new Exception("singleton does not allow multiple instance"); } } }
- Author:
- Rod Johnson
Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description Object
construct(ConstructorInvocation invocation)
Implement this method to perform extra treatments before and after the construction of a new object.
Method Detail
construct
Object construct(ConstructorInvocation invocation) throws Throwable
Implement this method to perform extra treatments before and after the construction of a new object. Polite implementations would certainly like to invokeJoinpoint.proceed()
.- Parameters:
invocation
- the construction joinpoint- Returns:
- the newly created object, which is also the result of the call to
Joinpoint.proceed()
; might be replaced by the interceptor - Throws:
Throwable
- if the interceptors or the target object throws an exception