Ross, On my dual SMP PII 350 I still only create 48 objects using this short code per second. <dtml-var standard_html_header> <dtml-in "_.range(0,1000)"> <dtml-with "ClientClass.createInObjectManager(_.getitem('unique_id',1), REQUEST)"> <dtml-var id> </dtml-with> </dtml-in> <dtml-var standard_html_footer> _.float works terrific. I suppose a blend of the two techniques would give a pretty solid id, even on very fast parallel machines, because they would have to get the same random number from a large amount of possiblities in under a millisecond. Thanks for both your help on this. <dtml-var "_.str(_.float(ZopeTime())) + _.str(_.whrandom.randint(1,100000))"> All my best, Ross Lazarus writes:

ZopeTime() to float to string conversion works even better since you get milliseconds - there is always the risk that in an SMP processor environment, you JUST might get bitten, but that's also true of any hash algorithm - you're down to probabilities which are exceedingly small.

Of course, you could enclose your new id generating code (hash or float time) in some loop which checks to see if an object with that id exists, if it does, wait a small random time, and add a letter to the end of the string, retest and loop until it IS unique, then create the object. The time taken to do all that means you could be "safe" from multiple processors doing precisely the same thing at precisely the same time..

jason spisak <44-@hiretechs.com> wrote: original article:http://www.egroups.com/group/zope/?start=25478

...

Zopsters,

numbers, employee numbers, etc...) so I don't like to use a counter for ids. The ZopeTime() to int to string conversion works unless you are programatically creating multiple items in the same folder, and have a descent processor. I have derived the following bad hack from the code

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