11:13 p.m.
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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11:54 p.m.
Which version of the various components are you using? And to what extent
have you changed the code?
(could you post the modified source file, e.g. using nopaste or pastebin?)
In any case, I would not recommend changing the source code until you are
completely sure that your
modification has not broken the code base.. Especially considering that you
can do this when you create
your KB:
KnowledgeBaseConfiguration kbConf =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
// Provide an instance of an AgendaFactory that returns an extension of
DefaultAgenda
((RuleBaseConfiguration) kbConf).getComponentFactory().setAgendaFactory( new
MyAgendaFactory() )
KnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase( kbConf );
For example:
public class MyAgendaFactory() {
public DefaultAgenda createAgenda(InternalRuleBase ruleBase) {
return createAgenda( ruleBase, true );
}
public DefaultAgenda createAgenda(InternalRuleBase ruleBase,
boolean initMain) {
return new DefaultAgenda( ruleBase, initMain ) {
@Override
public synchronized void fireActivation(Activation
activation) throws ConsequenceException {
System.out.println( "I am about to fire " );
super.fireActivation(activation);
}
};
}
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11:39 p.m.
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(a)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:)
--
View this message in context:
http://drools.46999.n3.nabble.com/Editing-DefaultAgenda-java-file-from-or...
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participants (3)
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Davide Sottara -
Mallory -
Mark Proctor