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
2 months, 2 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
2 months, 3 weeks
Need help in drool workbench
by RANJAN Nalini
Hi Team,
Hope you are doing good..
We are new in drool workbench and we are planning to use drools workbench for our upcoming project..
This development we are going to do across different region..
Currently we have common drools workbench which hosted in one PC...Major issue which we are facing is that whenever we do modification from one region and its break to other region development..
Is there any way to do our development without impacting to other region code ?.
Do we have any mechanism to disable rule which has been written by one developer and it can be enable only when flag will be true(like toggle features) ?
Regards,
Nalini Ranjan
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9 years
Compiled template rule ordering
by Patrick Conreaux
Hi,
I am attempting to compile a rule template and expecting the resulting rules
to preserve the ordering of the template and of the rows in the CSV file.
However, it doesn't appear that ordering is preserved. Is this a bug, or is
there a workaround?
I would like to rely on the implicit top-down salience by having rules in a
specified order within the same file. (I'm aware that mutually exclusive
rules are preferred, but this greatly complicates maintaining the rules for
my use case, as does maintaining salience values.)
Using the (slightly-modified) cheese example, this template...
template header
age
type
log
package org.drools.examples.templates;
global java.util.List list;
rule "first rule"
when
eval(true)
then
System.out.println("first rule");
end
template "cheesefans"
rule "Cheese fans_(a){row.rowNumber}"
when
Person(age == @{age})
Cheese(type == "@{type}")
then
list.add("@{log}");
end
end template
rule "last rule"
when
eval(true)
then
System.out.print("last rule");
end
...results in the following output, where the first and last rule appear
at the top followed
by the template rules in *reverse *row order. Any suggestions to achieve
the desired order?
package org.drools.examples.templates;
global java.util.List list;
rule "first rule"
when
eval(true)
then
System.out.println("first rule");
end
rule "last rule"
when
eval(true)
then
System.out.print("last rule");
end
rule "Cheese fans_3"
when
Person(age == Really old guy)
Cheese(type == "65")
then
list.add("provolone");
end
rule "Cheese fans_2"
when
Person(age == Young guy)
Cheese(type == "21")
then
list.add("cheddar");
end
rule "Cheese fans_1"
when
Person(age == Old guy)
Cheese(type == "42")
then
list.add("stilton");
end
Cheers,
Patrick
9 years
