9:35 a.m.
Hi,
I'm using Drools as a part of a Mule ESB solution and I'm having some
problems. Each time i send a message to Drools from the ESB it's content
get's asserted as a new fact in the working memory and then there it stays.
I would like to only fire the rules on the content of the last message. Is
there some way to get a fresh working memory for each time drools is called.
I found this post
http://drools.46999.n3.nabble.com/How-to-make-the-working-memory-quot-cle...
but i didn't understand how or if it was possible to do only using drl
files. I've tried passing the drools and kcontext variables to static helper
methods and assign a new session each time but then the application just
freezes up.
Regards
//Johan
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10:02 a.m.
Perhaps you should use a rule to retract anything except the "initial fact":
rule "Clear"
salience -1000000
when
$f: Object( eval( ! $f.getClass().equals(
org.drools.reteoo.InitialFactImpl.class) ) )
then
retract( $f );
end
Alternatively, use the type of an inserted fact, instead of Object and
omit the eval.
-W
On 12/03/2012, Spade87 <johan.spade(a)gmail.com> wrote:
Hi,
I'm using Drools as a part of a Mule ESB solution and I'm having some
problems. Each time i send a message to Drools from the ESB it's content
get's asserted as a new fact in the working memory and then there it stays.
I would like to only fire the rules on the content of the last message. Is
there some way to get a fresh working memory for each time drools is called.
I found this post
http://drools.46999.n3.nabble.com/How-to-make-the-working-memory-quot-cle...
but i didn't understand how or if it was possible to do only using drl
files. I've tried passing the drools and kcontext variables to static helper
methods and assign a new session each time but then the application just
freezes up.
Regards
//Johan
--
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2:22 p.m.
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?
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2:34 p.m.
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(a)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?
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3:18 p.m.
Thank you that worked out nicely =)
//Johan
2012/3/12 Wolfgang Laun <wolfgang.laun(a)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(a)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?
>
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> View this message in context:
>
http://drools.46999.n3.nabble.com/How-to-empty-the-Working-memory-tp38186...
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users(a)lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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RF kap. 2 §6 Varje medborgare är gentemot det allmänna skyddad mot
påtvingat kroppsligt ingrepp även i annat fall än som avses i 4 och 5 §§.
Han är därjämte skyddad mot kroppsvisitation, husrannsakan och liknande
intrång samt mot undersökning av brev eller annan förtrolig försändelse och
mot hemlig avlyssning eller upptagning av telefonsamtal eller annat
förtroligt meddelande. Lag (1976:871).
4436
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4436
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4 comments
3 participants
participants (3)
-
Johan Spaedtke -
Spade87
-
Wolfgang Laun