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 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 invoke Joinpoint.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