[Jboss-dev-forums] [Design of AOP on JBoss (Aspects/JBoss)] - Re: Aop field interceptor to provide filtering for method ca

[<kab...@jb...>]

I think the simplest approach is to have an interceptor at the start of the chain, which manages this.


  | public class ReentrancyStopperInterceptor implements Interceptor
  | {
  |    ThreadLocal done = new ThreadLocal();
  |    
  |    private Object invoke(Invocation invocation) throws Throwable
  |    {
  |       boolean wasDone = ((Boolean)done.get()).booleanValue();
  | 
  |       try
  |       {
  |          if (!wasDone)
  |          {
  |             done.set(Boolean.TRUE);
  |             return invocation.invokeNext();
  |          }
  |          else
  |          {
  |              //Needs adding, and will invoke target joinpoint skipping the rest of the chain
  |             return invocation.dispatch(); 
  |          }
  |       }
  |       finally
  |       {
  |          if (!wasDone)
  |          {
  |             done.set(Boolean.FALSE);
  |          }
  |       }
  |       
  |       return ret;
  |    }
  | }
  | 

I could implement the new dispatch() method pretty quickly, and I think this interceptor should belong in the aop module.

Similar functionality _could_ be added to the woven bytecode, but I don't think it is a good idea to code use-case stuff in there. 


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