[rules-users] How to empty the Working memory

[Johan Spaedtke]

Thank you that worked out nicely =)

//Johan

2012/3/12 Wolfgang Laun <wolfgang.laun at gmail.com>

> You can save the FactHandle returned from the insert() and retract that.
>
> Or you can retrieve the FactHandle via the WorkingMemorEntryPoint
> method getFactHandle( Object obj ).
>
> -W
>
>
>
> On 12/03/2012, Spade87 <johan.spade at gmail.com> wrote:
> > Using that rule worked, sort of... It correctly removes all of the
> objects
> > in
> > the working memory. The problem is that it clears everything... If you
> use
> > mule together with drools the drools module will send back whatever you
> sen
> > to it to mule when there are no more rules fireing. If I delete
> everything
> > as a last step then I wont get my modified data back. Right now i have
> one
> > method that takes a WorkingMemory and a collection and inserts everything
> > from the collection in the working memory.
> >
> > *Rule*
> > rule 'addAllFromCollection'
> > when
> >       c : MyCollection ( newCollection == true )
> > then
> >       DroolsUtil.insertCollection(drools.workingMemory, c )
> > end
> >
> > *JavaCode*
> > public static void insertCollection(WorkingMemory workingMemory,
> Collection
> > collection) {
> >       Iterator iterator = collection.iterator();
> >       while (iterator.hasNext()) {
> >               workingMemory.insert(iterator.next());
> >       }
> > }
> >
> > Basically what i want to do is write a corresponding function to retract
> > everything that is old
> >
> > *Rule*
> > rule 'retractAllFromCollection'
> > when
> >       c : MyCollection ( newCollection == false )
> > then
> >       DroolsUtil.retractCollection(drools.workingMemory, c )
> > end
> >
> > *JavaCode*
> > public static void retractCollection(WorkingMemory workingMemory,
> Collection
> > collection) {
> >       Iterator iterator = collection.iterator();
> >       while (iterator.hasNext()) {
> >               workingMemory.retract(iterator.next());
> >       }
> > }
> >
> > The problem is that the method workingMemory.retract() doesn't take a
> > argument but a FactHandle as an argument but if i try something like
> >
> > *JavaCode*
> > public static void retractCollection(WorkingMemory workingMemory) {
> >       Collection collection = workingMemory.getFactHandles();
> >       Iterator iterator = collection.iterator();
> >       while (iterator.hasNext()) {
> >               workingMemory.retract(iterator.next());
> >       }
> > }
> >
> > I get a rather strange exception
> > java.lang.UnsupportedOperationException: this is implementedby
> > StatefulKnowledgeImpl
> >       at
> >
> org.drools.reteoo.ReteooWorkingMemory.getFactHandles(ReteooWorkingMemory.java:363)
> >       at
> >
> se.sunstone.ebs.mama.oneqc.drools.DroolsUtil.insertCollection(DroolsUtil.java:21)
> >       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> >
> > Any thoughts?
> >
> > --
> > View this message in context:
> >
> http://drools.46999.n3.nabble.com/How-to-empty-the-Working-memory-tp3818693p3819245.html
> > Sent from the Drools: User forum mailing list archive at Nabble.com.
> > _______________________________________________
> > rules-users mailing list
> > rules-users at lists.jboss.org
> > https://lists.jboss.org/mailman/listinfo/rules-users
> >
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