[rules-users] Batch processing of facts in Drools?

[Wolfgang Laun]

My proposal:

Insert a List<Root> of your root facts. A low-salience rule matching this
List<Root> cleans up the remains of the previous root processing and plucks
off N Root objects from the List and inserts them.

-W


2010/3/11 Ryan Fitzgerald <ryan.fitzgerald at ericsson.com>

>  Hi,
>
> In our application, we want to process a large amount of facts. However, to
> avoid an overload on memory and drools, we would like to process the facts
> in batches.
>
> Our rules are setup so that we only insert a small number of initial or
> "root" facts, and then these facts trigger rules to fire that cause many
> other facts to be inserted, themselves triggering other rules.
>
> One way of batching this would be for the application to only insert the
> root facts into memory one by one and not inserting the next root fact until
> the previous one (and the batch of facts associated with it) have been
> processed and subsequently revoked.
>
> However, instead of the batching being controlled by the application, I
> would like to use a rule to do this i.e. insert all the root facts into
> memory and then call fireAllRules and have them processed one at a time.
>
> Does anyone have an idea how I can write a rule that causes a set of facts
> to trigger their rules, one fact at a time?
>
> Thanks.
>
>
>
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