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From "Ertio Lew (JIRA)" <>
Subject [jira] [Commented] (MYFACES-3779) Mixed mode(Server+client) for state saving
Date Mon, 23 Sep 2013 10:46:07 GMT


Ertio Lew commented on MYFACES-3779:

To deal with ViewExpiredExceptions most of us are forced to use client side saving even when
cost of state saving on server is minimal but when using the client side saving, there are
associated CPU costs to encrypt/decrypt the state when transferring between client & server.
Also I see lot of hidden fields containing large amount of text for viewstate data which increase
the page size considerably when pages are relatively small. Thus I just feel when we use client
side saving we a loosing a bit of performance, so why not just opt for client side saving
when it becomes real necessarily & otherwise use server saving. 

I think dealing with ViewExpiredException is a necessity for almost all public facing applications
& above strategy looks somewhat addressing that concern.
> Mixed mode(Server+client) for state saving
> ------------------------------------------
>                 Key: MYFACES-3779
>                 URL:
>             Project: MyFaces Core
>          Issue Type: New Feature
>            Reporter: Ertio Lew
> How about having a mixed mode for state saving whereby state is initially kept on server
for a configurable amount of time (so that fast frequent requests are served without transferring
the state from client to server several times, the drawback with client side saving) &
after that period of time if the page is still alive in browser but it is idle, a javascript
request is triggered which asks the server for that state data & now it will be kept on
client side, now the client & the server both know that state for this session is there
on client. If the page has died & no request has been sent to server asking for state
data till that period of time, then state data would be removed from server.
> A further enhancement could be that you could set a fixed amount out of all memory on
server that you want to allocate for state saving of all sessions. Till the time that quota
remains, state is kept on server using that quota. But when that quota is over all the state
information for further sessions is kept using client side state saving. Also a mixed mode.
> Such mixed modes would be very helpful in improving performance, & better utilization
of the server resources.

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