[jboss-jira] [JBoss JIRA] Created: (JBRULES-2275) Runtime addition of rules to an existing knowledgebase causes rules using 'accumulate' to stop firing as expected.

[Justin King (JIRA)]

Runtime addition of rules to an existing knowledgebase causes rules using 'accumulate' to stop firing as expected.
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                 Key: JBRULES-2275
                 URL: https://jira.jboss.org/jira/browse/JBRULES-2275
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 5.0.1.FINAL
         Environment: Windows XP SP3. Java 1.5, Eclipse Ganymede
            Reporter: Justin King
            Assignee: Mark Proctor


Using accumulate, we have a rule which looks like the following:

rule "Term2Obligation1"
	when	
		Number(intValue > 0) from accumulate(
                        $res : TermExecutedEvent(term == "standardStockResponse")
			$req : TermExecutedEvent(term == "standardStockQuery", 
			correlationId == $res.correlationId, 
			this before[5s] $res),
			init(int total = 0;),
			action(total++;),
			result(new Integer(total)))
	then
		System.out.println("Term2Obligation1");
end

This rule executes correctly as expected. However Sometimes we wish to add new rules to the existing KnowledgeBase (originally read in from .drl file) at runtime. To do this we use the following method:

String rule = "rule \"GeneralClause-2\" " +
			"when " +
				"ObligationComplianceEvent(term == \"term2\", obligation == \"obligation1\", level == 2) " +
			"then " +
				"System.out.println(\"GeneralClause-2\");" +
				"contract.setState(\"Hello\");" +
			"end";
			
			Resource ruleResource = ResourceFactory.newReaderResource((Reader) new StringReader(rule));
			kbuilder.add(ruleResource, ResourceType.DRL); 
			kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());

Doing this creates major problems and unpredictable behavior. Rules continue to fire after the runtime addition but any rules using accumulate in the above described fashion will no longer execute, even though the conditions are entirely unrelated to the new rule that has been added. However the rule will continue to execute as expected if one of the conditions is moved outside of the accumulate as per the following:

rule "Term2Obligation1"
	when	
		$res : TermExecutedEvent(term == "standardStockResponse")
		Number(intValue > 0) from accumulate(
			$req : TermExecutedEvent(term == "standardStockQuery", 
			correlationId == $res.correlationId, 
			this before[5s] $res),
			init(int total = 0;),
			action(total++;),
			result(new Integer(total)))
	then
		System.out.println("Term2Obligation1");
end

It seems that adding new rules at runtime somehow creates a problem which prevents rules using accumulate firing. Or at least rules with more than condition inside the accumulate. This would appear to be a definite bug, perhaps related to http://lists.jboss.org/pipermail/rules-users/2007-August/002696.html

This is preventing us from continuing our project as we needs to know all rules will continue to work as expected even after runtime additions. Please help! :)

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