[rules-users] Query about performance in using data as fact or using it as Global variable

[Nikhil S. Kulkarni]

Hi ,
                I am using drools 5.0 in application. I am facing performance issues. I am using drls, rule flows and rule templates.

My scenario is as follows :-

Consider there is list of 20 companies.
There are about 20000 members in each company.

Now I have several rules in which condition is for specific member and specific company.

e.g.

rule 1
 when  comp : company
                and member : Members
then
.........
End;

So similarly I passed Member list and company list as fact. But it was time consuming process.

So I have done one change.

I kept only comp:company in when condition of rule as I explained above and declare member list as global .

I created a function in rule in which I am iterating over member list and doing the same process.

Now this is taking less time.

Now my question is how efficient is this change.

Though we say that when we write specific condition in rule then it will be fired only in that case.
But when I use Agenda Event Listener class,
I come to know one thing that it creates activation-created for all possible conditions then it will fire activation-Fired for specific condition
And after that it will cancel all the activations.

So as I reduced member level fact condition my time is reduced drastically and performance improved.


So anybody can suggest me that whether I am on right track of improving time and performance or not ?

Waiting for reply.


Thanks & Regards,
Nikhil S. Kulkarni


MASTEK LTD.
In the US, we're called MAJESCOMASTEK

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