How to remove Drools 5 facts from a web service
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I have a web service in which I'm using a Drools 5 StatefulKnowledgeSession object.
The object lives between web service method invocations. The first thing that the service
method needs to do is clear out all the facts inserted during the last service method
invocation. I use StatefulKnowledgeSession.insert(Object fact) to add facts and
StatefulKnowledgeSession.getAgenda().clear() to clear out all facts. I don't think
that .clear() is doing what I think it is because by using a println() statement inside my
one and only rule's consequence I can see information from previous rules that should
be gone. In fact, the rule's consequence is invoked multiple times and I don't
know why. It's during those multiple invocations that the .println() shows me
information about the current and previous facts. The only method to fix this that
I've come up with is to delete and recreate StatefulKnowledgeSession every time the
web service's service method
is invoked, but that feels like a poor work-around. Any direction on how to delete facts
is greatly appreciated. Thank you.
Attachments:
- attachment.html (text/html — 1.2 KB)
2011/8/1 Matthew Erler <wires8(a)yahoo.com>
The first thing that the service method needs to do is clear out all
the
facts inserted during the last service method invocation. I use
StatefulKnowledgeSession.insert(Object fact) to add facts and
StatefulKnowledgeSession.getAgenda().clear() to clear out all facts.
The Agenda is where all *rule activations* live. Facts are reachable via the
kSession object, e.g., kSession.getFactHandles(), and you could use
retract() on them. But note well that retracting facts is not a free lunch:
each one updates the Rete network.
Calling kSession.dispose() and kBase.newStatefuleKnowledgeSession() is a
perfectly reasonable way to clear the ring for the next round.
-W
That worked. Thank you very much.
--- On Tue, 8/2/11, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
From: Wolfgang Laun <wolfgang.laun(a)gmail.com>
Subject: Re: [rules-users] How to remove Drools 5 facts from a web service
To: "Rules Users List" <rules-users(a)lists.jboss.org>
Date: Tuesday, August 2, 2011, 1:35 AM
2011/8/1 Matthew Erler <wires8(a)yahoo.com>
The first thing that the service method needs to do is clear out all the facts inserted
during the last service method invocation. I use StatefulKnowledgeSession.insert(Object
fact) to add facts and StatefulKnowledgeSession.getAgenda().clear() to clear out all
facts.
The Agenda is where all rule activations live. Facts are reachable via the kSession
object, e.g., kSession.getFactHandles(), and you could use retract() on them. But note
well that retracting facts is not a free lunch: each one updates the Rete network.
Calling kSession.dispose() and kBase.newStatefuleKnowledgeSession() is a perfectly
reasonable way to clear the ring for the next round.
-W
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