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Design discussion

Design discussion

2005-04-12 - By Ramnish Kalsi

Back

Reply: 1 2 3 4 5 6 7 8 9 10 >>

On the client side, the technology which google uses is also pretty clean -
AJAX - Asynchronous javascript and xml.
There are some good discussions about this on serverside.com

But, depends upon, how you want to divide the responsibilities between
client and server.

ramnish.

-- --Original Message-- --
From: An interest list for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)]On Behalf Of jon
Sent: 12 April 2005 17:38
To: J2EEPATTERNS-INTEREST@(protected)
Subject: Re: Design discussion

I saw a product once that used Javascript to interact with an applet, which
then established network connections on its behalf. I think in that case it
was only using straight "pull" HTTP requests, but presumably you could open
a connection that would accept a server-initiated "push".

I would expect such an approach to be pretty involved, but you might want to
research it more.

Regards,
Jon Petruk

On Tue, 12 Apr 2005 12:22:07 -0400, Vijay K Dasari wrote
> In Client/ Server model using thick clients like SWING, we can use an
Observer Pattern ( Publish/Subscribe ), where
> the client subscribes to the messages. when the server gets a new message,
it can notify all the subscribers(users).
>
> As Web (HTTP) is stateless, the client has to ask the server for the new
messages.
> Client can make request to a servlet(which tells whether the user has any
new messages) at certain time intervals.
> In html we can use the "Refresh" metatag. which looks something like
>
> <meta http-equiv="Refresh"
content="1800;URL=/servlet/checkNewMessages.do"/>
>
>
> Vijay.
>
>

> -- --Original Message-- --
> From: An interest list for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)]On Behalf Of Maya menon
> Sent: Tuesday, April 12, 2005 11:36 AM
> To: J2EEPATTERNS-INTEREST@(protected)
> Subject: Design discussion
>
>
> Our client/server application which work realtime:
> Currently we have a client/server application. Our users log into the
client and the system delivers messages to the users.
> when a new message arrives the users see a signal flashing and therby gets
notified about the
> new message.
>
> Now this client needs to be transformed into a web based system.
>
> Instead of the clients logging into the client window, now the users log
into the web site.
> The same feature has to be provided.
> when a new message arrives the users have to see a signal flashing and
therby gets notified about the
> new message.
> Can you all please suggest a good J2ee design approach for this ?
>
> How do we enable the flashing signal ? I need some suggestions.
>
> Thanks,
>
>

>
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--
Jonathan Petruk
J. Petruk Consulting Inc.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859 (See http://iso-8859.ora-code.com)-1">

<META content="MSHTML 6.00.2800.1491" name=GENERATOR></HEAD>
<BODY bgColor=#ffffff>
<DIV>On the client side, the technology which google uses is
also pretty clean - AJAX - Asynchronous javascript and xml.</DIV>
<DIV>There are some good discussions about this on
serverside.com</DIV>
<DIV> </DIV>
<DIV>But, depends upon, how you want to divide the responsibilities between client and
server.</DIV>
<DIV> </DIV>
<DIV>ramnish.</DIV>
<DIV> </DIV>
<DIV> -- --Original Message-- -- From:
An interest list for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)]On Behalf Of
jon Sent: 12 April 2005 17:38 To:
J2EEPATTERNS-INTEREST@(protected) Subject: Re: Design
discussion </DIV>
<BLOCKQUOTE> I saw a product once that used Javascript to
interact with an applet, which then established network connections on its
behalf.  I think in that case it was only using straight "pull" HTTP
requests, but presumably you could open a connection that would accept a
server-initiated "push". I would expect such an approach to be pretty
involved, but you might want to research it more. Regards, Jon
Petruk On Tue, 12 Apr 2005 12:22:07 -0400, Vijay K Dasari
wrote > In Client/ Server model using thick clients like
SWING, we can  use an Observer Pattern ( Publish/Subscribe ), where
 > the client subscribes to the messages. when the
server gets a new message, it can notify all the
subscribers(users). >   > As Web (HTTP)
is stateless, the client has to ask the server for the new messages.
 > Client can make request to a servlet(which tells
whether the user has any new messages) at certain time
intervals. > In html we can use the "Refresh" metatag. which looks
something like >   > <meta
http-equiv="Refresh"
content="1800;URL=/servlet/checkNewMessages.do"/> >
  >  
 > Vijay. >  
 >  
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,255) 2px
solid"> >
-- --Original Message-- -- > From: An
interest list for Sun Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)]On Behalf Of Maya menon
 > Sent: Tuesday, April 12, 2005 11:36 AM > To:
J2EEPATTERNS-INTEREST@(protected) > Subject: Design
discussion > > > Our client/server application
which work realtime: > Currently we have a client/server application.
Our users log into the client and the system delivers messages to the
users. > when a new message arrives the users see a signal flashing
and therby gets notified about the > new message. >  
 > Now this client needs to be transformed into a web based system.
 > > Instead of the clients logging into the client window, now
the users log into the web site. > The same feature has to be
provided. > when a new message arrives the users have to see a signal
flashing and therby gets notified about the > new message. >
Can you all please suggest a good J2ee design approach for this ? >
  > How do we enable the flashing signal ? I need some
suggestions. >   > Thanks, > >
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px
solid">
</BLOCKQUOTE> >
<HR SIZE=1>
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">Learn
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 > This email has been scanned by the MessageLabs Email Security System.
 > For more information please visit http://www.messagelabs.com/email
 >
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 > ====================================================================
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 -- Jonathan Petruk J. Petruk Consulting Inc. E-mail:
jon@(protected) phone:  905-668-9209     fax: 905-668-4728
 <A href="http://www.petruk.net/" target=_blank>http://www.petruk.net/</A>
 ==============================================================
======
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</BLOCKQUOTE> 
 
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