Re: [rules-users] The update function inside a rule
I think there is an open JIRA for a very similar issue:
JBRULES-2825 "rule with timer and CE not keeps firing after turning false"
I have added these two rules as a comment.
However, the timer isn't necessary in this here case. Since the SimpleClock
fact is updated periodically, the engine will fire the rule as soon as
dateInMillisec exceeds the clock value in the Message fact.
Both rules work correctly, if written without the timer.
Actuallay, the timer doesn't have any effect (except wasting a few cycles).
If the LHS becomes true, it delays the first firing by 1s, and then the LHS
is made false by changing the Message object. This stops the timer! But
then, eventually, the LHS becomes true again, and *another timer *is
started, delays 1s, fires, and terminates.
-W
2011/3/29 Marc Strabin <marc.strabin(a)gmail.com>:
Hello,
I've 2 rules which should be similar but the result is different and I
can't
understand why :
I insert an object Message() into drools with the following rule :
rule "rule_a"
timer (int:1s 1s)
when
SimpleClock ( d : dateInMillisec != 0 ) // SimpleClock give the current
time (set by a java timer and an update)
m : Message ( internalEndDate < d )
then
System.out.println( "rule a");
m.setInternalEndDate (d + 10000);
retract (m);
insert (m);
end
> the result is fine : a message every 10.
If I replace the rule_a by the rule_b : (because an update should be
better
than an retract/insert I guess)
rule "rule_b"
timer (int:1s 1s)
when
SimpleClock ( d : dateInMillisec != 0 ) // Simple slock give the current
time (set by a java timer and an update)
m : Message ( internalEndDate < d )
then
System.out.println( "rule b");
m.setInternalEndDate (d + 10000);
update (m);
end
> the result is bad : a message every 1 second.
It act as if the attibute message.internalEndDate wasn't updated in the
drools engine. Could someone explain me if/why this behaviour is normal ?
Thanks in advance
Marc
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