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From musky <musk...@gmail.com>
Subject Re: Using derby as a chat server
Date Thu, 14 Feb 2008 09:59:55 GMT

i have come up with a basic framework for the application:
there will be two treads:
one thread takes care of the GUI and taking user chat messages from the
keyboard onto a textbox.
the second thread will select the most recent message for the user from the
other party every "n" seconds.i will be using the java.util.timer package
for this.

does anybody know whether derby can put up with so many connections?

please give me your insights as i am still a newbie who wants to do
something new and i am doing my undergrad now.

francois.orsini wrote:
> Hi Musky,
> Jean-Francois Arcand (Grizzly / Comet project lead) and myself have
> demo'ed
> a chat server application with Derby at ApacheCon US and JavaPolis.
> We are working on a more generic framework that we intend to make
> available
> as part of some open source project (sub-project of Grizzly very likely).
> In
> the meantime, I'm going to post the source code and necessary archives on
> my
> blog. You can also find additional resources at:
> http://weblogs.java.net/blog/jfarcand/archive/2007/12/on_the_roadto_j_5.html
> http://blogs.sun.com/FrancoisOrsini/entry/developing_real_time_ria_with
> You can check the slides we presented for more info, especially about
> Comet,
> if you're not familiar with it yet.
> The idea behind this demo is to show the *multi-tier* aspect of Apache
> Derby. In this particular context, Derby is installed automatically and
> run
> (embedded) within the web browser as a Java plug-in extension. On this RIA
> client, Derby is used to store 'chat' conversation messages for any
> (signed-on) user that would use the chat application in that client.
> Messages are made persistent so that they can be re-read / re-accessed
> offline and you only get to see the messages for a particular user
> (obviously) - Messages could also be created *offline* so that the next
> time
> you're online, they get sent to the chat server. Derby runs embedded in
> the
> server to handle *overflow *of incoming and asynchronous messages,
> dispatched by *Comet*. Derby basically acts as an efficient and persistent
> cache to store data asynchronously, in this case, flux of incoming and
> outgoing network messages, handled by Comet.
> I'll post back here when archives are available for download.
> Cheers,
> --francois
> On Feb 13, 2008 7:05 AM, musky <muskvar@gmail.com> wrote:
>> i want to use derby as a chat server,
>> my idea is to insert whatever a user types into a table in the
>> database.This
>> table can have two fields UserID and the message(VARCHAR).how do i convey
>> the inserted message to the other party??
>> please help.
>> thanks.
>> --
>> View this message in context:
>> http://www.nabble.com/Using-derby-as-a-chat-server-tp15459468p15459468.html
>> Sent from the Apache Derby Users mailing list archive at Nabble.com.

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