I call this pattern a gateway - a separate process accepting input from the
outside world and then passing the input through to a Session Bean.
Absolutely no restrictions - it is just a client of the AppServer.
Deployment is a little more complex - you have to ensure the process is
continually running (or is restarted when/if it dies), and you have to
recover if the AppServer goes away and restarts.
Weblogic has a (vendor specific) mechanism for starting specified Java
'apps' when the AppServer starts (startup classes?).
I have this mechanism in (serious) production environments, using HP
OpenView to control re-starts etc. (other app managers would also be fine).
tim
> -----Original Message-----
> From: Lou Bona [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, June 15, 2000 1:36 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Threads in weblogic server
>
> I think you misunderstood, or maybe I did, but I thought the question
> became:
> can a client calling an EJB
> be running in a thread?
>
> I can't see any reason the server would even be aware that the calling
> process
> is running in a thread
> separate from the main thread of a client application (in a different VM).
> Or
> that the multiple clients
> hitting it are all spawned from the same process. However, my experience
> is
> limited to weblogic and
> I don't have the spec handy.
>
> Any insight is always appreciated,
>
> Lou Bona
> Chief Software Architect
> agentGo.com
>
>
> parikshit wrote:
>
> > That is because WebLogic is linient towards the programming restrictions
> in
> > EJBs(It allows threading and IO operations in EJBs). But your EJBs will
> not
> > be portable across EJB Servers(they will give some exceptions ).
> > Parikshit
> > ----- Original Message -----
> > From: Lou Bona <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Thursday, June 15, 2000 4:02 PM
> > Subject: Re: Threads in weblogic server
> >
> > I'm doing a very similar thing, and so far in my testing it's working
> fine.
> > I'm
> > using Weblogic 4.5, BTW.
> >
> > I've got a separate process (different VM) that is event driven. It will
> > spawn
> > threads that create a SFSB,
> > interact with the db via entity beans, then go away. The threads act as
> pure
> > clients and as such are not
> > limited by EJBs restrictions on threading, as far as I know anyway.
> >
> > good luck,
> >
> > Lou Bona
> > Chief Software Architect
> > agentGo.com
> >
> > Ajay Jain wrote:
> >
> > > Hi,
> > >
> > > Thanks for reply. The purpose of this thread is to receive a message
> and
> > > call certain method of EJBs depending upon the nature of the message.
> This
> > > thread needs to run with in the weblogic server or as a separate
> process.
> > >
> > > If this thread runs as a separate process then effectively the process
> > > containing the thread will be a client to the weblogic server. Can you
> > tell
> > > me if a weblogic client has similar restrictions on multithreading as
> a
> > > weblogic server. In case there are no restrictions, I think my problem
> is
> > > solved.
> > >
> > > Thanks
> > >
> > > Ajay
> > >
> > > > -----Original Message-----
> > > > From: EXT Suryanarayana Murthy
> > > > [mailto:[EMAIL PROTECTED]]
> > > > Sent: 15. June 2000 11:34
> > > > To: [EMAIL PROTECTED]
> > > > Subject: Re: Threads in weblogic server
> > > >
> > > >
> > > > I think your problem is not related to WebLogic server. You
> > > > need to write a
> > > > seperate class either implements Runnable or extends thread.
> > > > In that you can
> > > > write your polling code which can run in back ground for you
> > > > doing your
> > > > work. Hope this soves your problem.
> > > > I think your background process need not do anything with EJBs. I
> have
> > > > written similar kind of class which writes continuiously in to a
> file
> > > > whenever there are some messages written by users. Your class
> > > > should be a
> > > > singleton.
> > > >
> > > > If I am wrong anywhere, please correct me.
> > > >
> > > > Thanks,
> > > > Murthy
> > > >
> > > > > -----Original Message-----
> > > > > From: Ajay Jain [SMTP:[EMAIL PROTECTED]]
> > > > > Sent: Thursday, June 15, 2000 1:06 PM
> > > > > To: [EMAIL PROTECTED]
> > > > > Subject: Threads in weblogic server
> > > > >
> > > > > Hi Guys,
> > > > >
> > > > > I am using BEA weblogic server 5.1 to develope an EJB
> > > > Application.As a
> > > > > part
> > > > > of the design I am supposed to poll for certain messages by
> > > > calling a
> > > > > third
> > > > > party library method repititively. This activity needs to
> > > > be done in the
> > > > > background and as such requires a separate dedicated thread.
> > > > >
> > > > > My question is whether one can use dedicated thread in
> > > > weblogic server as
> > > > > multithreading is under container's control.Has anybody tried such
> a
> > > > > thing?
> > > > >
> > > > > If using a dedicated thread is not possible then is there any
> other
> > > > > alternative to such a problem. Looking forward to your help.
> > > > >
> > > > > Ajay Jain
> > > > >
> > > > >
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