[rules-users] Is there a faster way of doing this in Drools ?

[soumya_sd]

laune wrote
> 
> Merely filtering a subset of data items from a collection according to
> user's changing needs and whims is NOT the primary use case of a
> production
> rule system.  This kind of problem has been solved adequately and
> efficiently by SQL queries or some similar DB query technique.
> 
> It is true that such filtering rules, if compiled and stored in a
> KnowledgeBase, can achieve the same thing, but, since rules are targeted
> at
> a more sophisticated use cases, this will never be as efficient as a
> simple
> query system.
> 
> -W
> 
> 

you bring up an excellent point. 

What if the data is streaming in nature and is not stored in a database and
outside of your control. 

 
Another approach is to cache the data locally (in a database) and then use
SQL to filter it. 

I decided not to use the database approach because of two reasons. 

1. The database write operation may be expensive. 
2. In the future I may decide apply more complex consequence to my rules
than just filtering. 

Thanks. 

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