[rules-users] lock-on-active, why keeps evaluating?

[mmarmol]

Here is an example from the eclipse basic test project, i have added a new
Rule allways to be fired with 
lock-on-active true and also added a function to make a printiln in the
console to see what gets evaluated.

Code to run:

package com.sample;

import org.drools.KnowledgeBase;
import org.drools.KnowledgeBaseFactory;
import org.drools.builder.KnowledgeBuilder;
import org.drools.builder.KnowledgeBuilderError;
import org.drools.builder.KnowledgeBuilderErrors;
import org.drools.builder.KnowledgeBuilderFactory;
import org.drools.builder.ResourceType;
import org.drools.io.ResourceFactory;
import org.drools.logger.KnowledgeRuntimeLogger;
import org.drools.logger.KnowledgeRuntimeLoggerFactory;
import org.drools.runtime.StatefulKnowledgeSession;

/**
 * This is a sample class to launch a rule.
 */
public class DroolsTest {

	public static final void main(String[] args) {
		try {
			// load up the knowledge base
			KnowledgeBase kbase = readKnowledgeBase();
			StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
			KnowledgeRuntimeLogger logger =
KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test");
			// go !
			Message message = new Message();
			message.setMessage("Hello World");
			message.setStatus(Message.HELLO);
			ksession.insert(message);
			ksession.fireAllRules();
			logger.close();
		} catch (Throwable t) {
			t.printStackTrace();
		}
	}

	private static KnowledgeBase readKnowledgeBase() throws Exception {
		KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
		kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
		KnowledgeBuilderErrors errors = kbuilder.getErrors();
		if (errors.size() > 0) {
			for (KnowledgeBuilderError error: errors) {
				System.err.println(error);
			}
			throw new IllegalArgumentException("Could not parse knowledge.");
		}
		KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
		kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
		return kbase;
	}

	public static class Message {
		
		public static final int HELLO = 0;
		public static final int GOODBYE = 1;

		private String message;

		private int status;

		public String getMessage() {
			return this.message;
		}

		public void setMessage(String message) {
			this.message = message;
		}

		public int getStatus() {
			return this.status;
		}

		public void setStatus(int status) {
			this.status = status;
		}
		
	}

}


Rules file:

package com.sample
 
import com.sample.DroolsTest.Message;
 
function boolean testEval(String arg) {
	System.out.println(arg);
	return true;
}
 
 
rule "Hello World"
	when
		eval(testEval("Hello World eval up"))
		m : Message( status == Message.HELLO, myMessage : message )
		eval(testEval("Hello World eval down "))
	then
		System.out.println( myMessage ); 
		m.setMessage( "Goodbye cruel world" );
		m.setStatus( Message.GOODBYE );
		update( m );
end

rule "Allways"
	lock-on-active true
	when
		eval(testEval("Allways eval up"))
		Message()
		eval(testEval("Allways eval down"))
	then
		System.out.println("Allways has run");
end

rule "GoodBye"
	when
		eval(testEval("GoodBye eval up"))
		Message( status == Message.GOODBYE, myMessage : message )
		eval(testEval("GoodBye eval down"))
	then
		System.out.println( myMessage );
end


Out put:

Hello World eval up
Hello World eval down 
Allways eval up
Allways eval down
GoodBye eval up
Allways has run
Hello World
GoodBye eval down
Allways eval down
Goodbye cruel world

Why the rules Allways has been evaluated again after been fired, for what i
understand if the rule has lock-on-active true It shouldnt be evaluated
again since it shouldnt run any more.



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