[rules-users] Custom-Operator - No access to FactHandles?

[Martin, Matthias]

Exactly! I need to iterate over a bunch of objects/facts in the Working Memory.

Von: rules-users-bounces at lists.jboss.org [mailto:rules-users-bounces at lists.jboss.org] Im Auftrag von Vincent Legendre
Gesendet: Freitag, 10. Juni 2011 12:04
An: Rules Users List
Betreff: Re: [rules-users] Custom-Operator - No access to FactHandles?

And why not accessing the object itself directly ?
Because the evaluation of one object field depends on others objects in WM ?

Le 10/06/2011 11:54, Martin, Matthias a écrit :
Hello,

some of our custom operators need to access already inserted facts at runtime. Therefore we extended org.drools.base.BaseEvaluator. The provide methods, i. e.
public boolean evaluate(InternalWorkingMemory workingMemory, InternalReadAccessor extractor, Object object,  FieldValue value), state, amongst others, a parameter "workingMemory" of type org.drools.common.InternalWorkingMemory.
When calling workingMemory.getObjects() we receive a "UnsupportedOperationException". The question is whether it is possible to access facts in a KnwoledgeSession at runtime or not. Alternatively we could provide the objects in question as globals and call workingMemory.getGlobal(), but that seems to me like somewhat bad architecture.

Any suggestions are welcome.
Many thanks,
-Matthias






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