Yes, you can implement method interceptors using Dynamic Proxies; however,
you gotta use Dynamic Proxies for all your references!
What Gosling was describing was something more on the lines of:
Object.preMethodInvoke(Method aMethod, Object[] aArgs)
Object.postMethodInvoke(Method aMethod, Object[] aArgs, Object aReturn)
where method interception is built into all Java Objects! Of course the
default implementation does nothing, you're extended class would have to
override these methods... That would be cool!
Gene Chuang
Teach the world... Join Kiko!
<http://www.kiko.com/profile/join.jsp?refcode=TAF-gchuang>
-----Original Message-----
From: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]On Behalf Of James Cook
Sent: Wednesday, September 06, 2000 5:46 PM
To: [EMAIL PROTECTED]
Subject: Re: Interceptors in the EJB model
It's already there in JDK 1.3 in the form of Dynamic Proxies.
jim
> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[EMAIL PROTECTED]]On Behalf Of Gene Chuang
> Sent: Wednesday, September 06, 2000 6:38 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Interceptors in the EJB model
>
>
> I was reading some interview with James Gosling (java creator) somewhere
> where he was saying in the proposed draft for JDK 2.0, method
> pre-and-post-interceptors were gonna be implemented for native
> Java... but
> I don't think this idea got anywhere; too bad!
>
> Gene
>
> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[EMAIL PROTECTED]]On Behalf Of Tony Abbott
> Sent: Wednesday, September 06, 2000 3:03 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Interceptors in the EJB model
>
>
> Method interceptors are listed as one of the features that have been
> "deferred
> to future releases" in the EJB 2.0 public draft.
>
> -t
>
>
>
>
> On Tue, Sep 05, 2000 at 10:41:44AM -0700, Gene Chuang wrote:
> > Hi,
> >
> > Are you asking for the following hooks in the Bean class?
> >
> > void ejbPreCall(Method aMethod, Object[] aArgs);
> > void ejbPostCall(Method aMethod, Object[] aArgs, Object aReturn);
> >
> > Yeah, it'll be cool if they existed in the specs... EJB 3.0, maybe?
> >
> > Gene Chuang
> > Teach the world... Join Kiko!
> > <http://www.kiko.com/profile/join.jsp?refcode=TAF-gchuang>
> >
> >
> >
> > -----Original Message-----
> > From: A mailing list for Enterprise JavaBeans development
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Pedro Garcia Lopez
> > Sent: Tuesday, September 05, 2000 10:29 AM
> > To: [EMAIL PROTECTED]
> > Subject: Interceptors in the EJB model
> >
> >
> > Hi all,
> >
> > Is it possible to create interceptors for EJB components ?
> >
> > For example, I have a class called Bank with a method withdraw(), and I
> > want to trigger an event (using JMS) each time the method is called. The
> > interceptor should trigger the event and the Bank code remains intact.
> >
> > With CORBA you can create interceptors without problem.
> > In RMI you can modify stubs and mimic this interceptor concept (see
> > Javaworld thismonth).
> >
> > Is it possible with the EJB model ?
> > I imagine that this must be supported by some App container but must be
> > vendor-specific and non-standard.
> >
> > Any idea ?
> >
> >
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> >
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>
> --
>
> Tony Abbott [EMAIL PROTECTED]
>
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>
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