[rules-users] Editing DefaultAgenda.java file from org.drools.common

[Mark Proctor]

Do you still want the rules to execute according to the agenda salience, or as soon as they are matched?

Take a look at the Rule, and the attribute fireDirect. It's set by an annotation (see release notes):
 @activationListener('direct' ) 

This allows a rule to fire without needing to be added to the agenda, it currently calls fireActivation - so it's still serial. However you could add another metadata tag to specify async or not. This would allow either the standard fireActivation to be called, or an async one.

On a related subject, I sketched some ideas of how I'd like to see this working in the future. So that 'activationListener' approach is definitely not stable and will change.
https://community.jboss.org/wiki/RuleExecutionSemantics


Mark

On 23 Feb 2013, at 05:13, Mallory <gmalathi.in at gmail.com> wrote:

> Hello,
> 
> I would be grateful to receive some help regarding editing Drools engine
> source code. I am looking at making the drools engine execute rules parallel
> so I went ahead and changed the  DefaultAgenda.java source file. On running
> this file everything worked perfectly well. I tried to run two different for
> loops from 1 to 500 in two different rules and I saw that both threads were
> working together.
> 
> On the other hand when I make a jar file of this by using the class file for
> DefaultAgenda and try to run in a new project I am getting the error below:
> 
> java.lang.NoSuchMethodError:
> org.drools.RuleBaseConfiguration.getComponentFactory()Lorg/drools/reteoo/ReteooComponentFactory;
> 	at org.drools.common.DefaultAgenda.setWorkingMemory(DefaultAgenda.java:215)
> 	at
> org.drools.reteoo.ReteooWorkingMemory.<init>(ReteooWorkingMemory.java:110)
> 	at
> org.drools.reteoo.ReteooStatefulSession.<init>(ReteooStatefulSession.java:81)
> 	at
> org.drools.reteoo.ReteooRuleBase.newStatefulSession(ReteooRuleBase.java:402)
> 	at
> org.drools.reteoo.ReteooRuleBase.newStatefulSession(ReteooRuleBase.java:387)
> 	at
> org.drools.impl.KnowledgeBaseImpl.newStatefulKnowledgeSession(KnowledgeBaseImpl.java:176)
> 	at
> org.drools.impl.KnowledgeBaseImpl.newStatefulKnowledgeSession(KnowledgeBaseImpl.java:163)
> 	at drools.main.DroolsApi.createKnowledgeBase(DroolsApi.java:38)
> 	at drools.main.TestMain.main(TestMain.java:8)
> 
> 
> Can someone please help me fix this issue?
> 
> Thanks in advance:)
> 
> 
> 
> --
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