And Enhydra, I believe.
Michael
At 04:46 PM 10/4/00 +0530, Rahul Aras wrote:
>Gemstone.
>
>
>-----Original Message-----
>From: Luis Canals [mailto:[EMAIL PROTECTED]]
>Sent: Tuesday, September 26, 2000 10:26 PM
>To: [EMAIL PROTECTED]
>Subject: Re: Using singleton from EJBs (not implementing singleton with
>EJ B!)
>
>
>Which EJB containers use multiple VM's?
>
>-----Original Message-----
>From: Dave Wolf [mailto:[EMAIL PROTECTED]]
>Sent: martes, 26 de septiembre de 2000 17:32
>To: [EMAIL PROTECTED]
>Subject: Re: Using singleton from EJBs (not implementing singleton with
>EJB!)
>
>
> >
> > >
> > > A singleton pattern will not be very portable. Even if the
> > static member
> > > were portable which it is not, the use of custom ClassLoaders by most
> > > containers will likely cause issues with your pattern.
> > >
> >
> > It seems it would not be portable only if you want a singleton for all
> > containers in cluster. But a singleton seems very portable and applicable
> > in situations where you want a singleton object per container and do not
> > need to share that singleton between multiple containers.
>
>Not necesarilly. Its of course not a singleton across containers, but it
>may not even be a singleton within the same container.
>
>1) The container may use multiple VM's
>2) More common, the container may use a custom ClassLoader to load the
>classes in order to support features like hot swapping. If so, the
>singleton will only be unqique across a ClassLoader. Or, a more comman
>issue would be as per the J2EE spec, each web app must have its own
>ClassLoader. Meaning the singleton is only truly a singleton within the
>single web application.
>
>Dave Wolf
>Internet Applications Division
>Sybase
>
>
>
>
> >
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> >
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