[Zope-dev] New Counter Product
Michel Pelletier
michel@digicool.com
Wed, 24 Mar 1999 19:45:49 -0500
> -----Original Message-----
> From: Shaw, Howard [mailto:ShawH@STHS.org]
> Sent: Wednesday, March 24, 1999 7:11 PM
> To: 'Zope-Dev@zope.org'
> Subject: [Zope-dev] New Counter Product
>
>
> Well, it is basically finished and working, combining a
> visible Product
> interface and a counter tag... But, overriding __setstate__, removing
> the temporary entry from the state, and called
> Persistent.__setstate__,
> while generating no errors, fails to prevent the temporary entry from
> being written into the database. Please help, I need two answers!
>
> 1. How can I create a variable within a Product that will not be
> persistent (i.e. will not be written to disk)?
>
Prefix your variable name with _v_. If you don't want the attribute foo
to be persistent, call it _v_foo.
> 2. What function is called at normal shutdown? I need to call
> a function
> at shutdown to move the current value from temp to real.
>
Uhm.. there isn't a shutdown hook for Products. Is this what your
looking for?
> Note: The counter is usable as is, so if the list members think that
> Paul's now repudiated fear of constant disk growth is a non-issue, I
> could drop the temporary variable, and just keep the advantages of the
> interface, and the potential for an SQL based backend whilst
> keeping the
> same front-end.
>
> Thanks again.
>
> Howard C. Shaw III
> Programmer/SysAdmin
> St. Thomas High School
>
-Michel
>
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