We have at least two different projects where our clients have asked
for the ability to send a proactive message to the client, advising
him or her of an exceptional situation. As I understand things, this
is not possible in a pure browser model, where the browser has a
simple cycle of "read data, send to server, read response, show to
user". Therefore, it seems obvious the requirements for proactive
messages cannot be supported without some additional mechanism; I can
see two ways out:
1. Have every page refresh itself every N seconds, and show proactive
messages when they appear on the server. This is tantamount to
polling, is an ugly hack, and I only mention it for completeness.
2. Have an applet running on the browser, listening on a specific
port; when a message arrives, pass it on to the browser (probably
via JavaScript) so that the browser can do something with it. This
add listening functionality to the browser, and may open up a whole
can of worms in terms of security.
Does anybody have opinions on how this could be handled? Does Turbine
provide any mechanism for this kind of functionality? If the applet is
the way, anybody knows any open source components that implement this
solution? Comments are welcome. Thanks,
--
Gonzalo A. Diethelm
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