[Seaside] REST and Seaside

[Dmitry Dorofeev]

Dave,

IMHO your code deserves to be a part of Seaside!

-Dmitry.

On 10 Apr 2005, at 0:09, David Shaffer wrote:

> Nevin Pratt wrote:
>
>> [snip]
>>
>> And, as I mentioned in a response to Avi, it is Squeak 3.5, Seaside
>> 2.3, and Comanche 5.x.
>>
> Nevin,
>
> Are you using the "unregistered" session method?  I can't remember if 
> it
> was present in 2.3.  Anyway there was a bug in the 2.5b series (which
> was recently corrected) which, under some circumstances, caused 
> sessions
> to not receive the #unregistered notification.  This happened when
> several sessions were unregistered at once.  I noticed it on one of my
> servers and it caused stress on the garbage collector...potentially
> delaying the clean up of database resources, for example, until GC
> occurs.  The bug is easy to identify so if you think it might be
> impacting you, let me know off list and I'll send you a correction for
> the affected method (again, 2.5...don't know the situation in 2.3).
>
> In Seaside 2.5 session expiration is checked only when new sessions are
> created.  I've been experimenting with other schemes but I haven't
> gotten far since my instrumentation causes signficant performance
> problems.  One scheme that I do use in production is to keep a service
> running which checks for dead sessions at fixed intervals.  Since
> session clean up and subsequent GC can be expensive it is nice to have
> as much done during idle times as possible.  This background process
> seems to make my server more responsive to the first page accesses in a
> session.  It also reduced the impact of expensive GC's I was seeing
> after periods of high activity.  I have attached the version from my
> development image.  I believe it is unchanged from my current 
> production
> version and has worked for me for some time now.  Start it using:
>
> service := SessionExpirationService newNamed: 'session reaper'.
> service start
>
> This version checks every 30 seconds.  You'll have to edit the code to
> change the interval.
>
> David
>
>
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