drools-solver results question
by Andrew Waterman
Hello,
I'm starting to work with the drools-solver to help on a gaming
project. Basically, we have a game that works in two modes: 1) a
competitive game where humans (or agents) compete with one another on
a well defined game board to achieve 24 points by using three (or
four) agricultural development tokens. 2. A puzzle, where all 4
players work cooperatively to create an equitable solution, where all
4 players win with at least 24 points by means of our agricultural
development tokens.
I am starting to work with drools-solver to address the puzzle part of
our game. Basically, we are interested in having the solver do two
things for us: a) find the optimal solution for our game/puzzle,
based upon our requirements [this part seems quite straightforward]
and b) getting the total number of solutions that satisfy our
constraints. We would like, as well, to be able to inspect these
other, sub-optimal, solutions, in order to explore our game and puzzle
further. From my reading of the "Solver" API , it looks like we will
only be able to get the optimal solution. Does anyone have any
suggestions for a workaround in this case? Or is there some
functionality in the solver that I am missing?
I look forward to your feedback.
best wishes,
Andrew
---------------------------------
Andrew Waterman
San Cristóbal de las Casas, Chiapas, Mexico
1 week, 5 days
Need help with setFocus
by new2drools
Hi All,
Need some help with understanding setFocus.
I have the following use case:
if (condition1) {
if (condition2) {
} else if (condition3) {
} else if (condition 4) {
}
}
if (condition5) {
if (condition2) {
} else if (condition3) {
} else if (condition 4) {
}
}
I created 3 rules (rule2, rule3, rule4) for checking condition2, condition3,
condition4 and
created 1 agenda group (groupX) for them.
I created 2 rules (rule1, rule5) for checking condition1, condition5 and
created 1 agenda group(groupY) for them.
rule "rule1"
agenda-group "groupY"
when
//
then
drools.setFocus("groupX");
end
rule "rule3"
agenda-group "groupX"
activation-group "someActiveGroup"
when
//
then
//
end
>From the java code:
ksession.getAgenda().getAgendaGroup("groupY").setFocus();
Problem: The first time, drools.setFocus("groupX") is invoked, I see that
it's working fine. rule2 or rule3 or rule4 get triggered. But, the SECOND
time that drools.setFocus("groupX") is invoked, I don't see that any rule in
agenda-group groupX is being invoked...even though one of the rule's LHS
explicitly matches...thinking that the activation-group is cancelling all
the activation's (after one rule in that activation group is fired), I even
removed the activation-group statement. But, it didn't help...ideally, I
would like to bunch rule2, rule3, rule4 in one activation group.
Can you please let me know as to why the second invocation of setFocus is
not working? I even tried to remove everything in LHS of rule2/3/4, to see
if the second invocation would work...it doesn't...
Thanks!!
--
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Sent from the drools - user mailing list archive at Nabble.com.
1 month
Drools beginner - unable to resolve method using strict-mode
by Stefan Schuster
Hi,
I'm new to drools, and I made my first steps using the very nice
video-tutorial "Build Pong in 13 minutes using JBoss Drools" found here:
http://www.youtube.com/watch?v=Omj4PR3v-nI
Eclipse shows building errors, but Pong start anyway. What does this error
mean?
in move.drl there is following rule:
*<rule "Move Bat Up" timer(expr: bat.speed, bat.speed) no-loop when*
* ui : PongUI( ready == true )*
* ( KeyPressed( keyText == "A" ) and bat : Bat( playerId ==
PlayerId.PlayerOne, y > pconf.padding + pconf.sideLineWidth )*
* or*
* KeyPressed( keyText == "K" ) and bat : Bat( playerId ==
PlayerId.PlayerTwo, y > pconf.padding + pconf.sideLineWidth ) ) *
* td : TableDirty( ) *
*then *
* tableG = ui.getTablePanel().getTableG();*
* tableG.setColor( Color.BLACK ); // background*
* tableG.fillRect( bat.x, bat.y, bat.width, bat.height );*
* *
* modify( bat ) { y = bat.y - 2 };*
* tableG.setColor( Color.WHITE ); // background*
* tableG.fillRect( bat.x, bat.y, bat.width, bat.height ); *
* modify( td ) { dirty = true };*
*end*
the error message is:
[Error: unable to resolve method using strict-mode:
org.drools.spi.KnowledgeHelper.td<http://org.drools.spi.knowledgehelper.td/>
()]
[Near : {... @Modify with( td ) { dirty = true }; ....}]
in another File (ui.drl) TableDirty is defined:
*declare TableDirty*
* @propertyReactive*
* dirty : boolean*
*end*
Any ideas what this error message means? And why can I start pong despite
this error?
Thanks a lot for helping me
Stefan
4 months, 3 weeks
conways game of life
by Mark Proctor
For anyone looking for a good and complex example on how to write rules
properly, please look at Conways Game of Life in drools-examples, for
extra bonus points compare it to the old version in M1. You'll see
nearly all the logic is moved from java to the drl and we have removed
the need for nested objects by using objects relaitionally, which also
allows us to exploit cross products to drive the application.
Mark
4 months, 3 weeks
