[rules-users] Performance: Stateful vs. Stateless Session

[tonytang]

Can anybody help me to explain the performance between Stateful and Stateless 
session?

I write a very simple test code to test the performance: 
Just a message,if the id is odd then set a attribute to "odd"
if it is even then set to "even".
insert message one by one, and insert 1,000,000 times.

Rule:

rule "even"
when
message: Message()
eval((message.getId() % 2) == 0)
then
message.setOddOrEven("odd");
end

rule "odd"
when
message: Message()
eval((message.getId() % 2) == 1)
then
message.setOddOrEven("even");
end

message class just id and oddOrEven
public class Message {
    private int id;    
    private String oddOrEven;
    
    public Message(int id){
    	this.id = id;
    }
// getter and setter
}

My test code:
// create statefulSession and statelessfulSession out of KnowledgeBase
StatefulKnowledgeSession statefulSession =
kbase.newStatefulKnowledgeSession();
StatelessKnowledgeSession statelessfulSession =
kbase.newStatelessKnowledgeSession();

int messageNumber = 1000000; // total message number

Random random = new Random(); // to generate id

long begin = System.currentTimeMillis();
for(int i = 0; i < messageNumber; i++){
FactHandle handle = statefulSession.insert(new Message(random.nextInt()));
statefulSession.retract(handle);
}
statefulSession.dispose();

long end = System.currentTimeMillis();
long statefulTime = end - begin;

begin = System.currentTimeMillis();
for(int i = 0; i < messageNumber; i++){
statelessfulSession.equals(new Message(random.nextInt()));
}
end = System.currentTimeMillis();
long statelessTime = end - begin;

System.out.println("Stateful session time: " + statefulTime + "  Stateless
session time: " + statelessTime);


The result: "Stateful session time: 12158  Stateless session time: 46"

oh my god...
Is there any place is wrong in my code ?




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