using BigDecimal in rules
by Marina
Hi,
I'm getting unexpected results when when using BigDecimal objects for matching in rules.
I'm generating DRL in my code, using freemaker.
I have a RuleEngineNumericFact object which has two attributes:
String propertyName
BigDecimal propertyValue
Below is an example of a rule where I try to match a RuleEngineNumericFact object based on the two attributes:
rule "aaa"
agenda-group "r1"
dialect "java"
when
(RuleEngineNumericFact( propertyName == "somename" , propertyValue == 10.8 ))
then
String ruleId = drools.getRule().getName();
firedRuleIDs.add(ruleId);
end
Then I create a new RuleEngineNumericFact object and set its propertyValue as following:
String stringValue = "10.8";
BigDecimal propertyValue = new BigDecimal(stringValue, new MathContext(10));
(I also tried to use default precision settings by creating the BigDecimal value as:
BigDecimal propertyValue = new BigDecimal(stringValue);
)
When I insert this fact into the rule engine - the rule does not get fired, so the fact does not match.
One note: if the values are integeres (like, propertyValue == 100) - the rule gets fired. So, it is only the floating point numbers that do not match.
I generate the DRL in my Java code, using freemaker, and I specify the
value that will be used in the rule for matching by calling toString()
method on a BigDecimal object that I get from my business code. The toString() representation ends up to be the "10.8" value (for example).
According to the BigDecimal documentation, marshalling from/to the same string representation shoudl still produce BigDecimal objects that will return TRUE from the equals() method when compared.
any ideas why this is not working here?
How does Drools compare values of objects like BigDecimal?
thanks,
Marina
17 years, 1 month
Drools Boot Camp and San Francisco
by Mark Proctor
I'm still trying to get budget approval. We are looking at the Hilton at
the moment as expedia have rooms at $103 per day, which is very good
value. I can get travel and room budget for my team, but not meeting
room budget. The meeting room is $400 per day, I might be able to
negotiate a little off that, and we will need "sponsors" to cover the
price of the meeting room for the week, if this is to go ahead.
We are looking at a date range of:
arriving - 31 of May
departure - 8th of June
So we'll need a room from the 1st to the 7th, inclusive. If you are able
to sponsor the meeting room for a day or two, or more :), please do let
me know as soon as possible.
Thanks
Mark
17 years, 1 month
lock-on-active documentation
by Wolfgang Laun
>From Drools-5.0.0, Expert, 7.8.1. Sentence numbers added by me:
[1] when a ruleflow-group becomes active or an agenda-group receives the
focus
any rules that have lock-on-active set to try cannot place activations onto
the
agenda, the rules are matched and the resulting activations discarded.
[2] This is a stronger version of no-loop.
[3] It's ideally for calculation rules where you have a number of rules that
will modify a fact and you don't want any rule re-matching and firing.
[4] In summary fire these currently active rules and only these rules, no
matter how the data changes, do not allow any more activations for the rules
with the attribute set to true.
[5] When the ruleflow-group is no longer active or agenda-group loses the
focus those rules with lock-on-active set to true can once again add
activations onto the agenda.
[4] says that activations "for the rules with the attribute set to true" are
disallowed. This is confusing or even in contradiction with [1], which I
understand to mean that WM updates done by the RHS of a rule X with
lock-on-active==true don't result in any activations. (Of course, this
includes activations of X itself.)
[5] is absolutely confusing: How can rules in a group that isn't active
or doesn't have the focus can add activations - irrespective of its
lock-on-active setting?
[1] s/when/When/, s/try/true/
I would create a JIRA, but I'd like to be sure what to suggest for a fix.
-W
17 years, 1 month
ClassCastException in ruleflow
by Femke De Backere
Hi,
I have a real annoying problem with my ruleflow, when I execute a
subprocess, I get a classcastexception on my variable communication.
Apparently Drools thinks the variable is an instance of the class
masterproef.common.Patient, while my variable is of the type
masterproef.humancommunication.Communication... I really don't know
how this happened. All my settings appear to be correct.
Any ideas?
Thx,
17 years, 1 month
Testing out Type Declarations in simple rule file causing exceptions
by CK
Hi,
I'm wondering if I am doing something wrong in my code:
I create dummy type declarations to indicate presence of certain
states (is there possibly a better way of doing this?):
declare Domestic
dummy : boolean
end
declare Multiple
dummy : boolean
end
rule "..."
when
......
then
insert(new Domestic());
end
Something like this is giving me the following errors during DRL file
parsing:
Unable to build expression for 'consequence': Failed to compile: 1
compilation error(s):
- (0,0) could not resolve class: Domestic ' insert(new Domestic());
Based on what the docs say, this should generate the proper dynamic
classes and I should immediately be able to use the declared types.
I did additional checking by outputting the registered Type
Declarations. These two types are indeed registered in the
PackageBuilder.getPackage().getTypeDeclarations().
So I can only guess that either I'm doing something wrong here or
there is a bug in the CR1 release.
17 years, 1 month
classcastexception in ruleflow
by Femke De Backere
Hi,
I have a real annoying problem with my ruleflow, when I execute a
subprocess, I get a classcastexception on my variable communication.
Apparently Drools thinks the variable is an instance of the class
masterproef.common.Patient, while my variable is of the type
masterproef.humancommunication.Communication... I really don't know
how this happened. All my settings appear to be correct.
Any ideas?
Thx,
Femke De Backere
17 years, 1 month
using forall with from
by Garrett Conaty
I've got an odd parse case that I'm hoping the parser wizards could
confirm is the same as the bug JBRULES-1611:
This works
not (exists (Event(eval
(eventDate.after(CalendarUtil.getDateDaysPast(30)))) from $room.events))
but this doesn't
forall( Event(eval
(eventDate.before(CalendarUtil.getDateDaysPast(30)))) from
$room.events )
It's like doing math proofs all over again. Technically I think I've
got to fix the logic because !< is >-= rather than >.
Thanks,
Garrett
17 years, 1 month
serialVersionUID incompatibility with MVELDialectRuntimeData when using Guvnor 5.0CR1
by 山本 裕介
Hi,
I'm evaluating Guvnor 5.0CR1 and having problem when the
MortgageApplicationTest example.
It just fails with InvalidClassException, saying that serialVersionUID
of MVELDialectRuntimeData are different.
That doesn't make sense to me because I'm using absolute paths to
point the server side jars.
The version I'm using is "Drools 5.0.0.CR1 Guvnor Standalone".
$ java -Dfile.encoding=UTF-8 -classpath /Users/yusukey/jbproject/
droolstest/target/classes:/Users/yusukey/jboss-eap-4.3cp03/server/
default/deploy/drools-guvnor.war/WEB-INF/lib/drools-
core-5.0.0.CR1.jar:/Users/yusukey/jboss-eap-4.3cp03/server/default/
deploy/drools-guvnor.war/WEB-INF/lib/drools-api-5.0.0.CR1.jar:/Users/
yusukey/jboss-eap-4.3cp03/server/default/deploy/drools-guvnor.war/WEB-
INF/lib/mvel2-2.0.8pre1.jar com.notidiots.MortgageApplicationTest
RuleAgent(MyConfig) INFO (Sat Mar 14 11:06:13 JST 2009): Configuring
with newInstance=true, secondsToRefresh=30
RuleAgent(MyConfig) INFO (Sat Mar 14 11:06:13 JST 2009): Configuring
package provider : URLScanner monitoring URLs: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/mort...
RuleAgent(MyConfig) EXCEPTION (Sat Mar 14 11:06:25 JST 2009):
org.drools.rule.MVELDialectRuntimeData; local class incompatible:
stream classdesc serialVersionUID = -3277457858074244250, local class
serialVersionUID = 6582893639473442227. Stack trace should follow.
java.io.InvalidClassException: org.drools.rule.MVELDialectRuntimeData;
local class incompatible: stream classdesc serialVersionUID =
-3277457858074244250, local class serialVersionUID = 6582893639473442227
One thing I may need to mention is that I needed to change one single
line to compile MortgageApplicationTest.java as following:
----------------
- import org.drools.rule.FactType;
+ import org.drools.definition.type.FactType;
----------------
Any idea why?
I'm attaching the full stack trace.
Cheers,
Yusuke
17 years, 1 month
