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| | | Design discussion | Design discussion 2005-04-12 - By Vijay K Dasari
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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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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.2800.1400" name=GENERATOR></HEAD>
<BODY>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=875440916-12042005>In
Client/ Server model using thick clients like SWING, we can use an
Observer Pattern ( Publish/Subscribe ), where </SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=875440916-12042005>the
client subscribes to the messages. when the server gets a new message, it can
notify all the subscribers(users).</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=875440916-12042005>As
Web
(HTTP) is stateless, the client has to ask the server for the new messages.
</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=875440916-12042005
>Client
can make request to a servlet(which tells whether the user has any new messages
)
at certain time intervals.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=875440916-12042005>In
html we can use the "Refresh" metatag. which looks something
like</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005><meta http-equiv="Refresh"
content="1800;URL=/servlet/checkNewMessages.do"/></SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005>Vijay.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=875440916-12042005></SPAN></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-- --Original Message-- --<BR><B>From:</B> An interest list for Sun
Java Center J2EE Pattern Catalog
[mailto:J2EEPATTERNS-INTEREST@(protected)]<B>On Behalf Of </B>Maya
menon<BR><B>Sent:</B> Tuesday, April 12, 2005 11:36 AM<BR><B>To:</B>
J2EEPATTERNS-INTEREST@(protected)<BR><B>Subject:</B> Design
discussion<BR><BR></FONT></DIV>
<DIV>Our client/server application which work realtime: </DIV>
<DIV>Currently we have a client/server application. Our users log into
the client and the system delivers messages to the users.<BR>when a new
message arrives the users see a signal flashing and therby gets notified
about
the<BR>new message. </DIV>
<DIV> </DIV>
<DIV>Now this client needs to be transformed into a web based system.</DIV>
<DIV><BR>Instead of the clients logging into the client window, now the users
log into the web site.<BR>The same feature has to be provided. <BR>when a new
message arrives the users have to see a signal flashing and therby gets
notified about the<BR>new message.</DIV>
<DIV>Can you all please suggest a good J2ee design approach for this ?</DIV>
<DIV> </DIV>
<DIV>How do we enable the flashing signal ? I need some suggestions.</DIV>
<DIV> </DIV>
<DIV>Thanks,<BR><BR></DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
</BLOCKQUOTE>
<P>
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