Hi,
is possible that session is not replicated until the end of the http request
is reached? How is possible to replicate DURING the http request?
I am on the wrong way?
On 05/10/2012 10:07 PM, Davide wrote:
Hi Michael,
thanks for the reply!
Is possible to test a case in which two HTTP requests are on different VM?
I like to understand if exchanging info through the session works.
Must I use synchronized when accessing the HttpSession?
On 05/10/2012 03:53 PM, Michael Hermus wrote:
The two HTTP requests are not guaranteed to execute in the same VM, regardless
of session ID, so you should definitely NOT rely on thread interaction. The
session object is updated in real time, and of course memcache is a great tool
for sharing short lived state, as long as you can tolerate failures.
However, it sounds to me like you should really explore the Channel API to
accomplish your goal:
https://developers.google.com/appengine/docs/java/channel/overview
On Thursday, May 10, 2012 9:21:02 AM UTC-4, Davide Montesin wrote:
Hi,
I like to develop a Rich User Interface. To obtain this on user interaction
I need two thread: one for action processing,
and one for incrementally update the client side (html).
I generate two http requests from the client. The two request must
communicate.
The "update" request must exchange data with the "action" request. Both
request have the same
session id.
Can I use the session for exchanging data between two thread? Or can be
that at the same time
exists more than one node/jvm that is elaborating the same session id? If
yes, data in session
is synchronized in realtime?
What about synchronizing the two request. Can I use the Thread.wait/notify
or no because
request for the same session can be on different nodes?
Must I poll the session from a thread to discover if the other thread has
written new information?
Exist another way, i.e. memcache, to obtain this in google app engine.
Thanks in advance for any help!
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