[rules-users] Inserting a fact via a specific entry point inside a rule

[Mauricio Salatino]

You are pretty close:
entryPoints["ob1 stream"].insert(mre);

Try with that.

2009/8/16 Justin King <justin.matthew.king at gmail.com>

> Hi Everyone,
>
> I'm aware that in Drools you can use 'insert()' in the 'then' part of a
> rule to insert a new fact into the memory, meaning more rules may be fired
> based on the addition of this new fact. I wish to do a similar thing, but I
> wish to insert the fact into a specific entry point. My current rule code to
> do this is:
>
> rule "Allow message buyBook"
> no-loop true
>     when
>         $event : MessageRecievedEvent(operationName == "buyBook") from
> entry-point "t1 stream"
>     then
>         MessageRecievedEvent mre = new MessageRecievedEvent();
>         mre.setOperationName("sellBook");
>         StatefulKnowledgeSession session =
> kcontext.getKnowledgeRuntime().getKnowledgeBase().newStatefulKnowledgeSession();
>         WorkingMemoryEntryPoint obStream =
> session.getWorkingMemoryEntryPoint("ob1 stream");
>         obStream.insert(mre);
>         session.fireAllRules();
> end
>
> rule "ob1"
> no-loop true
>     when
>         $event : MessageRecievedEvent(operationName == "sellBook") from
> entry-point "ob1 stream"
>     then
>         System.out.println("executed");
> end
>
> Which is pretty hideous, but it does work, causing the second rule to fire
> after the first one. What I would like is something like:
>
> rule "Allow message buyBook"
> no-loop true
>     when
>         $event : MessageRecievedEvent(operationName == "buyBook") from
> entry-point "t1 stream"
>     then
>         MessageRecievedEvent mre = new MessageRecievedEvent();
>         mre.setOperationName("sellBook");
>         insert(mre, "ob1 stream")
> end
>
> rule "ob1"
> no-loop true
>     when
>         $event : MessageRecievedEvent(operationName == "sellBook") from
> entry-point "ob1 stream"
>     then
>         System.out.println("executed");
> end
>
> Is something like this possible or will I have to write a function to do
> it? I'm also a bit concerned about the performance hit of creating a whole
> new StatefulKnowledgeSession to fire the second rule, I'd like to just use
> the current one.
>
> Thanks,
>
> Justin
>
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> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>


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