RE: [Webware-discuss] HowTo Restart AppServer and Preserve Sessio n Based Locks

[Geoffrey T. <gta...@na...>]

In case you weren't aware of it, you can register a "shutdown handler" using
self.application().addShutDownHandler(func).  You could write a function
that pickles your dictionary to disk and register it as a shutdown handler.

- Geoff

> -----Original Message-----
> From: Roger Haase [mailto:cro...@ya...]
> Sent: Sunday, March 02, 2003 12:31 PM
> To: Webware discuss
> Subject: [Webware-discuss] HowTo Restart AppServer and 
> Preserve Session
> Based Locks
> 
> 
> I currently use my SitePage module to hold a shared MiddleKit 
> store and
> a dictionary which I use as a lock holder for active users who are
> editing a logical section of a MySQL database.
> 
> I would like to be able to restart the AppServer:
>    - from a servlet as discussed in another thread recently
>    - automatically by updating a module
>    - from the console
> 
> How can I save and restore my dictionary lock holder under all of the
> above instances? Or is there a better technique I could use (like a
> MySQL table or file instead of a dictionary in SitePage)?
> 
> Using a file or table would be an easy fix, but I currently detect
> timed out users by maintaining a last accessed time in the lock
> dictionary and clearing timed out users whenever a new user tries to
> obtain a lock. Maintaining the last access time would require 
> rewriting
> the file/table with each incoming transaction. Is there a 
> better way to
> detect and remove a timed out user?
> 
> Roger Haase
> 
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