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From "souravm" <>
Subject Web Push Technology
Date Tue, 03 Jan 2006 04:34:01 GMT

Hi All,

Though it is not directly related to Struts but thought of getting
valueable valuable inputs from the Web guru's in this forum.

This is regarding use of push technology for sending alert messages from
a server to user's browsers.

The push will need to be initiated by an alert server or streaming
engine, which will keep pushing data (alerts) to the users's browsers.
Now the key thing is not just the instant alert but the use of streaming
engine as a central repository for publishing all types of messages from
all type of applications.

In that context I'll like to know

1. The pros and cons -
I can see some pros and cons for it -
- If you use push, you need to have persistent connection with the
browsers, throwing the scalability out of orbit (considering our
requirement of 30,000 logged in users to start with)
- If some kind of pull with auto refresh is used with frequency set at a
very low interval, it will create a lot of http traffic

2. What are the relevant technologies avaialble in Java/J2EE for this -
a) How AJAX an be used ?
b) I was going through pushlet ( concept in one site.
But still not sure how reliable that concept.

In overall, looking for thought points on the high level philosophy
(whether it is at all recommended) and also the implementation option of
the same in Java/J2EE.

Any input/pointer would be really helpful.


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