Firewalls definitely muddy the waters. There may be some ORBs that provide
bi-directional tunneling, but I suspect that this could be problematic in
internet deployments with multiple firewalls etc.
One solution I have seen a lot of is using http protocol from clients, and
marshalling objects by serializing and encoding them into strings. This is
passed via http to a servlet that can un-marshal the Java objects and invoke
on the target bean.
Clients can implement a sort of call back by polling via http.
This is icky, but perhaps a practical consideration for internet
deployments.
-Chris.
> -----Original Message-----
> From: Bhattacharyya, Ana [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, April 06, 2000 1:03 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Sending Events to EJB Clents
>
> Is server calbacks possible accross firewalls??
> Anamitra
>
> -----Original Message-----
> From: Chris Raber [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, April 06, 2000 12:48 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Sending Events to EJB Clents
>
>
> JMS, or CORBA or RMI callbacks will do the job.
>
> -Chris.
>
> > -----Original Message-----
> > From: Denys Kim [SMTP:[EMAIL PROTECTED]]
> > Sent: Thursday, April 06, 2000 1:06 AM
> > To: [EMAIL PROTECTED]
> > Subject: Sending Events to EJB Clents
> >
> > Greetings
> >
> > IHAC who is using Persistence PowrTier EJB app server for on-line
> trading
> > and stock updates. The client is a standalone Java application that
> > essentailly logs in and pulls info from the EJB server. It also must
> > receive stock updates from the EJB server that is in turn receving
> updates
> > from the a legacy data source. The question is, once the EJB beans has
> > recieved updates from the legacy data source (via JMS or other App
> server
> > supported messaging system) what mechanism can be used to push the data
> to
> > a client acrosss the internet. One option under consideration is using
> > JMS Topics to do pub/sub push to the client. I believe the JMS Topics
> are
> > using multicast underneath (the JMS providers are I should say) and if
> > this is the case, can multicast span the internet across routers that
> may
> > not support multicast. If JMS is not an option what other methods can
> be
> > used (other than sockets of course). I believe Weblogic has a
> proprietary
> > event delivery mechanism as well. Any!
> > h!
> > !
> > !
> > elp will be greatly appreciated.
> >
> >
> > Denys
> >
> >
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