Hello,
we are currently evaluating Grizzly as servlet container replacement for our
Open-Xchange server. In our usecase-scenario we set up several
Open-Xchange/Grizzly backends behind an Apache balancer and connect those with
mod_proxy_balancer and mod_proxy_http. The balancer is configured with a timeout
[1] (Connection timeout in seconds. The number of seconds Apache waits for data
sent by / to the backend.) of 100 seconds. Request routing is done via special
JSessionIds with appended backend routes. The communication with some of our
possible clients is realized via server push from servlets, the client opens a
connection and waits for for the next data to receive from the server. We have
to be able to keep the connections to those special clients alive for an
undefined time interval while the rest of the clients will be affected by the
100s timeout. Those special clients can simply be identified by the request url.
Now i'm looking for the best way to keep the connection between backend and
balancer alive without rewriting everything to use websockets.
I thought about writing a filter to watch writes on those connections based on
request url and implement something like a watcher thread that periodically
checks the last read/write times and sends a keep-alive package to the balancer
if needed. But i don't know if Grizzly let's me safely access the
response/connection while another thread from the backend might access the same
response/connection anytime to do another message push. Do you have any ideas or
pointers for further research? Another question is how to build the package so
it just keeps the connection between backend and balancer alive and doesn't even
reach the client?
[1]
http://httpd.apache.org/docs/2.2/mod/mod_proxy.html#proxytimeout
Best regards
--
Marc Arens
Backend Development
Open-Xchange AG
Phone: +49 2761 8385-0, Fax: +49 2761 838530
-------------------------------------------------------------------------------
Open-Xchange AG, Rollnerstr. 14, 90408 Nürnberg, Amtsgericht Nürnberg HRB 24738
Vorstand: Rafael Laguna de la Vera, Carsten Dirks, Aufsichtsratsvorsitzender:
Richard Seibt
European Office: Open-Xchange GmbH, Martinstr. 41, D-57462 Olpe, Germany
Amtsgericht Siegen, HRB 8718, Geschäftsführer: Frank Hoberg, Martin Kauss
US Office: Open-Xchange, Inc., 303 South Broadway, Tarrytown, New York 10591
-------------------------------------------------------------------------------