[rules-users] CEP accumulate unclear behavior

Hi all. Respected experts of drools, please help me to understand how pattern + accumulate behave. I believe that an example is the best way to explain the problem, maybe it will look bulky, but suppose be enough. I use CEP and EventProcessingOption.Stream. Event class: /public class ServicePerformanceEvent { private String serviceName; private Integer duration; public ServicePerformanceEvent(String name, Integer duration) { serviceName = name; this.duration = duration; } }/ There are 2 tests, 1st - with fireAllRules invocation, 2nd - with firwUntilHalt invocation. / @Test public void *test1_FireAllRules() *throws RuleGeneratorException { System.out.println("-= 1 =-"); ksession.insert(new ServicePerformanceEvent("MyService", 2)); ksession.fireAllRules(); System.out.println("-= 2 =-"); ksession.insert(new ServicePerformanceEvent("AnotherService", 10)); ksession.fireAllRules(); System.out.println("-= 3 =-"); ksession.insert(new ServicePerformanceEvent("MyService", 12)); ksession.fireAllRules(); System.out.println("---test1 end---"); } @Test public void *test2_FireUntilHalt()* throws RuleGeneratorException, InterruptedException { System.out.println("-= 1 =-"); ksession.insert(new ServicePerformanceEvent("MyService", 2)); runFireUntilHaltThread(); Thread.sleep(1000); System.out.println("-= 2 =-"); ksession.insert(new ServicePerformanceEvent("AnotherService", 10)); Thread.sleep(1000); System.out.println("-= 3 =-"); ksession.insert(new ServicePerformanceEvent("MyService", 12)); Thread.sleep(1000); System.out.println("---test2 end---"); }/ There are 3 simple rules for which I performing tests: *////First Rule:* declare com.test.event.ServicePerformanceEvent @role( event ) end rule "ServicePerformanceEvent test rule1" dialect "mvel" when $event : ServicePerformanceEvent(serviceName == "MyService"); then System.out.println("$event.duration = " + $event.duration); System.out.println("----------FIRED----------"); end Invocation results of the test1_FireAllRules() and test2_FireUntilHalt() the same: -= 1 =- $event.duration = 2 ----------FIRED---------- -= 2 =- -= 3 =- $event.duration = 12 ----------FIRED---------- ---test end--- Actual: As expected rule fires for each new inserted event with desired serviceName "MyService" (- behavior is clear). *////Second rule:* rule "ServicePerformanceEvent test rule2" dialect "mvel" when accumulate(ServicePerformanceEvent(serviceName == "MyService", $thisDuration : duration); $avg : average($thisDuration)); then System.out.println("$events avg duration = " + $avg); System.out.println("----------FIRED----------"); end Invocation results of the test1_FireAllRules() and the test2_FireUntilHalt() the same again: -= 1 =- $events avg duration = 2.0 ----------FIRED---------- -= 2 =- -= 3 =- $events avg duration = 7.0 ----------FIRED---------- ---test end--- Actual: Now rule accumulates average only for events from working memory with desired serviceName (-this is clear) but fires only for inserted events with expected serviceName "MyService" (- not clear) *My expectation*: rule must fire for each currently inserted event and average must be calculated for all events from working memory with serviceName=="MyService". *////Third rule:* /rule "ServicePerformanceEvent test rule3" dialect "mvel" when $event : ServicePerformanceEvent(serviceName == "MyService"); accumulate(ServicePerformanceEvent(serviceName == "MyService", $thisDuration : duration); $avg : average($thisDuration)); then System.out.println("$event.duration = " + $event.duration); System.out.println("$events avg duration = " + $avg); System.out.println("----------FIRED----------"); end/ Invocation results of the test1_FireAllRules(): -= 1 =- $events avg duration = 2.0 ----------FIRED---------- -= 2 =- -= 3 =- $events avg duration = 7.0 ----------FIRED---------- $events avg duration = 7.0 ----------FIRED---------- ---test1 end--- Actual: In case -=3=- rule fires for each event into working memory during average calculation (- not clear) *My expectation*: firing rule only for current/last inserted event and calculation average for all events into working memory considering sevriceName=="MyService". Invocation results of the test2_FireUntilHalt(): -= 1 =- $events avg duration = 2.0 ----------FIRED---------- -= 2 =- -= 3 =- $events avg duration = 2.0 ----------FIRED---------- $events avg duration = 7.0 ----------FIRED---------- $events avg duration = 7.0 ----------FIRED---------- ---test2 end--- OR (with another sleep time) -= 1 =- $events avg duration = 2.0 ----------FIRED---------- -= 2 =- -= 3 =- $events avg duration = 7.0 ----------FIRED---------- $events avg duration = 7.0 ----------FIRED---------- $events avg duration = 7.0 ----------FIRED---------- ---test2 end--- This results I can't explain and understand. Could anyone help me to understand this pattern + accumulate behavior. I spent a lot of time on my actual project task but with no result . *The actual task is*: Rule must fire for last inserted event if its serviceName equals to "MyService" and its duration greater than average duration of all events with same serviceName from the working memory. On the project we use fireUntilHalt strategy. I really hope and appreciate any help. Thanks in advance. -- View this message in context: http://drools.46999.n3.nabble.com/CEP-accumulate-unclear-behavior-tp40270... Sent from the Drools: User forum mailing list archive at Nabble.com.