Re: Sending Events to EJB Clents

[James Wu - Sun Java Center McLean VA]

Denys,

Consider this is a internet chat application - every message needs to brocast
in real time to the group. There is an excellent example in java servlet
programming book by Oreilly using HTTP protocol and observer/observable pattern.
I have tested the software and it works fine. You can download software from
http://www.oreilly.com/catalog/jservlet/
The software is at chapter 10 ChatServlet.java file.

Have fun!

James

>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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