The problem is that the engine does not know when you are done inserting all the Post facts, so each post inserted is propagated down the network with the cancellation and reactivation of the rule.
This is one of those situations where a use of a control fact might be recommended, if you are inserting Post facts in batches. E.g.:
rule X
when
exists( AllPostsInserted() )
$a : ArrayList(size > 0) from collect(Post());
then
...
end
Edson
2012/2/13 Wolfgang Laun
<wolfgang.laun@gmail.com>
Repeatedly creating this ArrayList is bound to be O(n2).
Why do you want the Post facts as a List? There may be better ways for achieving your goal.
-WOn 13 February 2012 20:49, Shur, Bob
<robert.shur@hp.com> wrote:
I have a simple class Post { int id; ... }. I insert some number of them as facts and then call ksession.execute(facts);
The whole drl file (except for package and import statements) is:
rule "collect"
when
$a : ArrayList(size > 0) from collect(Post());
then
System.out.println("Number of posts: " + $a.size());
System.out.println("DONE");
end
The time it takes to run is n-squared in the number of posts. For 4000, 8000, 16000, 32000, 64000 posts the time is (in 1/10 seconds):
4, 14, 56, 220, 852
Is this expected? Is there a better way for me to do the collect?
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Edson Tirelli
JBoss Drools Core Development
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