[rules-users] Drools-server KnowledgeSessions

[Richard Calmbach]

Here is how I create StatefulKnowledgeSession instances dynamically, while
still leveraging Spring config:

[...]

  <drools:ksession kbase="kBase" type="stateful" id="kSessionParent">
    <drools:batch>
      <drools:set-global identifier="helper" ref="sessionHelper"/>
    </drools:batch>
  </drools:ksession>

  <bean id="kSession" scope="prototype" parent="kSessionParent"/>

  <bean id="knowledgeSessionGateway"
class="com.acme.rules.CompositeKnowledgeSessionGateway">
    <lookup-method name="createSession" bean="kSession"/>
  </bean>

Read [1,2] for background on Spring method injection and how to use it to
get a factory method for Spring-configured prototype beans without your
code (here: CompositeKnowledgeSessionGateway) needing to be Spring-aware.
Note that conceptually, kSessionParent is an abstract bean, but the
"abstract" attribute does not seem to be supported on <drools:ksession>.
Class CompositeKnowledgeSessionGateway has a

    protected StatefulKnowledgeSession createSession() {
        return null;
    }

method (that could be abstract) that gets overridden in a Spring-generated
subclass.

Ref.:
[1]
http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/beans.html#beans-factory-method-injection
[2] http://blog.springsource.com/2004/08/06/method-injection/

-Richard

On Wed, Jan 11, 2012 at 4:37 PM, Hrumph <Herman.Post at imail.org> wrote:

> Is it possible to dynamically create a KnowledgeSession using the
> Drools-server API, or must the be statically declared in the Spring config?
>
> Thanks
>
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