[rules-users] infinite loop in decision table

[Swindells, Thomas]

As I see it you have a number of options,

As you have said you could scope your latches so that they only apply to a particular object, rather than generating a UUID you can probably get away with using the object reference itself; however you will also need to watch out for memory leaks, this can probably be solved by having a rule which removes latches when the object they refer to is no longer in the knowledge base.

You may also be able to use drools flow to fire the pieces in one at a time but not need to recreate the entire state again.

Your best bet (if possible) is to restructure your model so that your actions don't modify the objects that your conditions are based upon.  For instance rather than actually performing any changes you populate result objects and use a query after the rules have finished firing to retrieve them all.  This does have the downside however that it removes one of the advantages of a rules engine that the actions can cause other rules to activate and deactivate.

Hope this helps, if not hopefully someone else will have some better insights than me,

Thomas

> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org [mailto:rules-users-
> bounces at lists.jboss.org] On Behalf Of djb
> Sent: 26 January 2010 09:07
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] infinite loop in decision table
>
>
> Hi Thomas,
>
> I implemented the latch system as you suggested, but came to a problem when
> running batches of data.
>
> Since the latch is set when the rule fires, you can't have that rule fire
> for more than one piece of data.
>
> So, with this method, for batch processing, you need to include a UUID into
> each latch.
>
> Are there any other patterns?  All this UUID and Latch/Flag functionality
> seems really a lot more complicated than it should be.
>
> I suppose I can write it to only process one piece of data at a time, but
> that might end up slower.
>
>
> Regards,
> Daniel
> --
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