[rules-users] persisted StatefulKnowledgeSession failed to maintain the length of Sliding window?

[henrychen]

Hi, all: 
I'm a newbie to Drools.

I'm trying to restore stateful knowledge session using JPAKnowledgeService
after restarting server. In my rules I use Drools Fusion's Sliding Length
Window to processing events. Below is a sample: 
package com.sample 
import com.sample.Event;
import java.util.List;

declare Event @role(event) end

rule "test"

when
 
$list : List() from collect(Event() over window: length(2))

then

System.out.println("list size:" + $list.size());

end
 
And I have done what should be done according to the manual reference. When
I running my test case below:

@Test

public void test_persistedsession() {

KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();

loadDRL(kbase);

Environment env = KnowledgeBaseFactory.newEnvironment();

env.set( EnvironmentName.ENTITY_MANAGER_FACTORY,
Persistence.createEntityManagerFactory( "org.drools.persistence.jpa"));

env.set( EnvironmentName.TRANSACTION_MANAGER,
TransactionManagerServices.getTransactionManager());
 
//create a persisted statefulknowledgesession

StatefulKnowledgeSession ksession =
JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env);
 
ksession.insert(new Event());
 
ksession.fireAllRules();
 
ksession.insert(new Event());

ksession.fireAllRules();

//reload the persisted session

ksession =
JPAKnowledgeService.loadStatefulKnowledgeSession(ksession.getId(), kbase,
null, env); 

ksession.insert(new Event());
 ksession.fireAllRules();

 ksession.insert(new Event());
 
ksession.fireAllRules();

}

Then I found that the result is:

Hibernate: insert into SessionInfo (id, lastModificationDate,
rulesByteArray, startDate, OPTLOCK) values (null, ?, ?, ?, ?) 

Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?,
startDate=?, OPTLOCK=? where id=? and OPTLOCK=? 

list size:1

Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?,
startDate=?, OPTLOCK=? where id=? and OPTLOCK=? 

Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?,
startDate=?, OPTLOCK=? where id=? and OPTLOCK=?

list size:2
Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?,
startDate=?, OPTLOCK=? where id=? and OPTLOCK=? 

Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?,
startDate=?, OPTLOCK=? where id=? and OPTLOCK=?

list size:3

Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?,
startDate=?, OPTLOCK=? where id=? and OPTLOCK=? Hibernate: update
SessionInfo set lastModificationDate=?, rulesByteArray=?, startDate=?,
OPTLOCK=? where id=? and OPTLOCK=?

list size:4

Hibernate: update SessionInfo set lastModificationDate=?, rulesByteArray=?,
startDate=?, OPTLOCK=? where id=? and OPTLOCK=? 

As I have declared that the length of window is 2, how can the size of list
increase to 3, 4 and more? 
I am using the 5.2.0 final. May be I have missed something, please help me. 
Any help will be appreciated. 



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