[rules-users] duration attribute & other rule language features issue

[prashant.badhe]

Hi,

Tried your rule with the code below, but no luck.

I am using only one rule, so the fact remains in drools session for
sufficient time (> 5 s). Even if I uncomment the /thread.sleep(60000)/  line
below, the rule does not trigger.

~~~~~~~~~~~~~~~~~~
public class DroolsTest {

	static StatefulKnowledgeSession ksession = null;
	static KnowledgeRuntimeLogger logger = null; 
	
	public static final void main(String[] args) {
		try { 
			initSession();
			testTimerAttribute();
		} catch (Throwable t) {
			t.printStackTrace();
		}
	}
	
	private static void testTimerAttribute() {
			
		Alert alert = new Alert();
		alert.setId(12345L);
		alert.setType("TYPE");
		alert.setComponentId("XXX");
		WorkingMemoryEntryPoint entryPoint =
ksession.getWorkingMemoryEntryPoint("EventStream");
		entryPoint.insert(alert);

		System.out.println("inserted...Count: " + entryPoint.getFactCount());	
//Count returned = 1

		try {
			//Thread.sleep(60000);
		} catch (Exception ex) {
			System.out.println("Exception...");
		}

		Alert alert1 = new Alert();
		alert1.setId(99991L);
		alert1.setType("LINK_UP");
		alert1.setComponentId("ZZZ");
		entry.insert(alert1);
		System.out.println("inserted again...Count: " + entry.getFactCount());
//Count returned = 2

		logger.close();
			
	}
	
	private static void initSession() {
			
			new Thread(new Runnable() {
		        public void run() {
		        	try {
		        		System.out.println("Inside initSession()...");
		    			KnowledgeBase kbase = readKnowledgeBase();
		    			KnowledgeSessionConfiguration conf =
KnowledgeBaseFactory.newKnowledgeSessionConfiguration();
		    			conf.setOption( ClockTypeOption.get( "pseudo" ) );
		    			ksession = kbase.newStatefulKnowledgeSession(conf, null);
		    			logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession,
"test");
		    			ksession.fireUntilHalt();
		        	} catch (Exception t) {
		        		System.out.println("Inside thread init() error..." +
t.getMessage() + "#########" + t.getStackTrace());
		    		}
		        }
		      }).start(); 
			
	}
	
}


And the rule is:

rule "check timer attribute"
	agenda-group "enrichment"
	auto-focus true
	no-loop
	salience 140
               //timer (int: 5s 1s)

	when	
		 $alertObj : Object( eval($alertObj instanceof Alert)) from entry-point
"EventStream"
		 $alert : Alert( componentId == "XXX" ) from entry-point "EventStream"
	then
		try  {
		System.out.println("[enrichment] nullify empty component id [alert=" +
((Alert)$alertObj).getId() + "] [Time: " +
(Calendar.getInstance().getTimeInMillis()));
			//$alert.setType("test type");
			//$alert.setComponentId("YYY");
			//update($alert);
		} catch (Throwable e) {
			System.out.println("[enrichment] ############## ERROR: nullify empty
component id [alertId=");	// + $alert.getId() + "][error=" + e.toString() +
"]");
		}
end


~~~~~~~~~~~~~~~~~~

Please suggest us some solution on timer() issue .

One more thing I observed today is (without timer() off course), when I put
following 3 lines in RHS of rule:
/$alert.setType("test type");
$alert.setComponentId("YYY");
update($alert);/

 then sometimes I get following exception at /update($alert)/:
*java.lang.ClassCastException: org.drools.common.DefaultFactHandle cannot be
cast to org.drools.common.EventFactHandle*
org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:201)
org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:145)
org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:251)
org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:183)
org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:196)
abc.xyz.alertProcessor.Rule_check_timer_attribute_0.defaultConsequence(Rule_check_timer_attribute_0.java:27)
abc.xyz.alertProcessor.Rule_check_timer_attribute_0DefaultConsequenceInvoker.evaluate(Rule_check_timer_attribute_0DefaultConsequenceInvoker.java:35)
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917)
org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856)
org.drools.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1049)
org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:829)
org.drools.common.AbstractWorkingMemory.fireUntilHalt(AbstractWorkingMemory.java:805)
org.drools.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:230)

Does this mean, modifying value of fact members in RHS is not expected? , &
if modified then drools may not find that object in its pool for update() &
retract() (based on the EventFactHandle)?

- Prashant

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