9:33 p.m.
Were the rules in the agenda group entitled to fire more than once? For a
rule to fire, it must be activated by the insertion, update or (sometimes)
retraction of one or more objects. Once a rule has fired, it can't fire
again until it gets activated again. An agenda-group can be used to
/prevent/ an active rule from firing (if the rule belongs to a non-focused
group), but can't make a rule fire again
Davide
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5:52 a.m.
New subject: How to run an agenda group multiple times?
According to Drools export document,
*Each time setFocus() is called it pushes that Agenda Group onto a stack.
When the focus group is empty it is popped from the stack and the focus
group that is now on top evaluates. An Agenda Group can appear in multiple
locations on the stack. *
If I run setFocus() on an agenda group two times, the agenda group should be
in multiple locations on the stack, why the rules in this agenda group are
fired only once?
Thanks,
Zhao Yi
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6:06 a.m.
New subject: How to run an agenda group multiple times?
What Davide is saying is correct, as is your quotation of the docmentation.
I'll try to rephrase Davide's explanation: the group should be activated
twice, but the rules aren't necessarily fired. The conditions (incl. rule
attributes) should still match before anything fires.
Zhao Yi wrote:
According to Drools export document,
*Each time setFocus() is called it pushes that Agenda Group onto a stack.
When the focus group is empty it is popped from the stack and the focus
group that is now on top evaluates. An Agenda Group can appear in multiple
locations on the stack. *
If I run setFocus() on an agenda group two times, the agenda group should
be in multiple locations on the stack, why the rules in this agenda group
are fired only once?
Thanks,
Zhao Yi
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6:08 a.m.
New subject: How to run an agenda group multiple times?
Consider this scenario:
insert facts, rules r, s, t in group G are activated
set focus for agenda group G
set focus for agenda group G
fireAllRules
rules r, s fire
rule t fires and inserts a fact so that rule u in G is activated
rule u fires
G is popped from the stack - no more rules in G are activated
G is popped from the stack - no rules in G are activated
Two immediately successive pushes of the same agenda group are useless.
-W
On 14 November 2011 12:52, Zhao Yi <zhaoyi0113(a)gmail.com> wrote:
According to Drools export document,
*Each time setFocus() is called it pushes that Agenda Group onto a stack.
When the focus group is empty it is popped from the stack and the focus
group that is now on top evaluates. An Agenda Group can appear in multiple
locations on the stack. *
If I run setFocus() on an agenda group two times, the agenda group should
be
in multiple locations on the stack, why the rules in this agenda group are
fired only once?
Thanks,
Zhao Yi
--
View this message in context:
http://drools.46999.n3.nabble.com/How-to-run-an-agenda-group-multiple-tim...
Sent from the Drools: User forum mailing list archive at Nabble.com.
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Zhao Yi