Occasionally, my _v_mycahce is empty when I didn't clear it. It looks like my product object gets dropped from memory, then reloaded, resulting in a missing cache.
Or you could be an a different thread since _v_ attribute is actually thread specific.
2) Is there a server-lifetime class of objects? Is there a workaround to get there? Can I force my object and its attributes to live in memory and not get purged until shutdown?
I havent tried it yet, but in 2.5.1 you could use the Temporary Folder.... -- Andy McKay Agmweb Consulting http://www.agmweb.ca ----- Original Message ----- From: "Charlie Reiman" <creiman@kefta.com> To: <zope@zope.org> Sent: Thursday, August 15, 2002 5:55 PM Subject: [Zope] Persistence Problem
I've got a product that has a little pool of database connections. These are low level DCOracle2 objects, not Zope DB connections. These live in a hash table-like cache living in a volatile attribute of a persistent product.
Something like this:
myproduct _v_mycache conn1 conn2 conn3
The cache periodically reaps old connections. The product insures the cache exists before it uses it, as it is volatile and might not exist at any point in time. Here's my problem:
Occasionally, my _v_mycahce is empty when I didn't clear it. It looks like my product object gets dropped from memory, then reloaded, resulting in a missing cache. If this is true then what I need is an class or attribute that is persistent for the server lifetime. It looks like all I can get from Zope is permanent persistent objects or volatile objects.
So my questions are:
1) Can I put a trap somewhere on my object so I know when it gets purged or loaded? Just a simple "sys.stderr.write('loading\n')" would be enough to confirm my suspicions.
2) Is there a server-lifetime class of objects? Is there a workaround to get there? Can I force my object and its attributes to live in memory and not get purged until shutdown?
Thanks in advance. I think I can work around this with traditional coding kung-fu, but it'll be a pain. A solution like 'set this attribute to true' or 'subclass from twiddle' would make me really happy.
Charlie.
_______________________________________________ Zope maillist - Zope@zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )