Setting unused globals on a session
by gqmulligan
I save many different knowledge packages for different accounts to a
database. Most accounts use a particular service to pull data from the
database but not all of them. Because of this I wanted to set this service
as a global on the session.
However, because not all accounts use the service I get an exception when I
try to set it on the session for an account that does not use the service
anywhere in its rules. Does an exception really need to be thrown in this
case?
Also, do I have any options to work around this exception without having
some sort of "master" rule that is automatically put into all accounts and
declares all globals? The service is being pulled from a bean so I would
like to stay away from having to find it by name and keep to injecting any
global services if possible.
Thanks.
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14 years, 2 months
how to handle the overwrinting values in drools planner
by Ricardo
Hi,
First Thanks for helping me with your valuable time,
I have 2 boxes, lets say each size of 5x5 and I have 3 items two size 4x4
and one item size is 3x3. planner initially planner assigning as follows...
item1 --> box1
item2 --> box2
item3 --> box1
When I use 2 item, result as follows...
item1 --> box1
item2 --> box2
item3 --> box1
When I increase one more box....
item1 --> box1
item2 --> box2
item3 --> box3
in the above 3 scenarios...first one (2 boxes and 3 items), is the
overwriting the item1 with iem3 into box1.
I am beginner for drools-planner.....any tips or help will be most
appreciated....
-----
with kind regards,
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14 years, 2 months
planning entity value range type
by Ricardo
Hi,
*/"A planning entity should not use other planning entities to determinate
its value range. That would only try to make it solve the planning problem
itself and interfere with the optimization algorithms."/*
reference to the above from the drools-planner user guide, I can use the
other planning entity property but not to use other planning entity to
determine its value range. Am I correct?
thanks,
-----
with kind regards,
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14 years, 2 months
traits - don more than 3 pojos, got IllegalArgumentException
by Michal Bali
Hi all,
I came across this issue when trying out 'traits' with POJOs (not declared
types). An IllegalArgumentException is being thrown when I apply the third
'don'. Here is how to reproduce:
as the POJO I am using the Message class that comes with the project
created by the Eclipse plugin.
now the rule file:
declare Message
@Traitable
end
declare NiceMessage
@format(trait)
end
rule load
when
then
Message message = new Message();
message.setMessage("Hello World");
insert(message);
don(message, NiceMessage.class);
Message unreadMessage = new Message();
unreadMessage.setMessage("unread");
insert(unreadMessage);
don(unreadMessage, NiceMessage.class);
Message oldMessage = new Message();
oldMessage.setMessage("old");
insert(oldMessage);
System.out.println("don " + oldMessage);
don(oldMessage, NiceMessage.class); //*<--- exception happens here*
System.out.println("wont reach this point");
end
When I run this and rule 'load' fires the third 'don' will throw the
following exception:
Exception executing consequence for rule "load" in com.mycompany.app:
java.lang.IllegalArgumentException: argument type mismatch
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:709)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:673)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:221)
at com.mycompany.app.DroolsTest.main(DroolsTest.java:44)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at
org.drools.factmodel.traits.TraitFactory.getProxy(TraitFactory.java:92)
at
org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:502)
at
org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:522)
at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8.defaultConsequence(Rule_load_86ecf966a4c14d8486844cfae2e1e0d8.java:21)
at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8DefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
at
com.mycompany.app.Rule_load_86ecf966a4c14d8486844cfae2e1e0d8DefaultConsequenceInvoker.evaluate(Unknown
Source)
at
org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)
... 6 more
Am I doing something wrong or is this a bug. I am running with 5.4.0.Beta2.
BTW traits are a great piece of functionality. Thank you!
Best regards,
Michal
14 years, 2 months
planner score calculation error...
by Ricardo
Hi when i use the following drl file for score calculation ....It assign a
bigger table into the smaller room. help will be appreciated....
console output is as follows..
*Solved Organizer with 2 rooms and 3 tables:
Table 1 -> Room 1
Table 2 -> Room 2
Table 3 -> Room 2*
test data:
Room room1 = new Room(10, 10);
room1.setId((long) 1);
Room room2 = new Room(10, 10);
room2.setId((long) 2);
----
Table table1 = new Table(10, 10);
table1.setId((long) 1);
Table table2 = new Table(9, 9);
table2.setId((long) 2);
Table table3 = new Table(9, 9);
table3.setId((long) 3);
drl file for score calculation...
//created on: Jun 18, 2012
package org.drools.planner.organizer;
dialect "java"
//list any import classes here.
import
org.drools.planner.core.score.buildin.hardandsoft.HardAndSoftScoreHolder;
import org.drools.planner.core.score.constraint.IntConstraintOccurrence;
import org.drools.planner.core.score.constraint.ConstraintType;
import org.drools.planner.organizer.domain.Room;
import org.drools.planner.organizer.domain.Table;
//declare any global variables here
global HardAndSoftScoreHolder scoreHolder;
//
############################################################################
// Hard constraints
//
############################################################################
rule "requiredLengthTotal"
when
$room : Room($length : length)
$requiredSpaceTotal : Number(intValue > $length) from accumulate(
Table(
room == $room,
$tablelength : length),
sum($tablelength)
)
then
insertLogical(new IntConstraintOccurrence("requiredLengthTotal",
ConstraintType.NEGATIVE_HARD,
$requiredSpaceTotal.intValue() - $length,
$room));
end
rule "requiredWidthTotal"
when
$room : Room($width : width)
$requiredSpaceTotal : Number(intValue > $width) from accumulate(
Table(
room == $room,
$tablewidth : width),
sum($tablewidth)
)
then
insertLogical(new IntConstraintOccurrence("requiredWidthTotal",
ConstraintType.NEGATIVE_HARD,
$requiredSpaceTotal.intValue() - $width,
$room));
end
//
############################################################################
// Soft constraints
//
############################################################################
rule "roomLengthCapacity"
when
$room : Room($length : length)
$table : Table(room == $room, length > $length, $tablelength :
length)
then
insertLogical(new IntConstraintOccurrence("roomLengthCapacity",
ConstraintType.NEGATIVE_SOFT,
($tablelength - $length),
$room, $table));
end
rule "roomWidthCapacity"
when
$room : Room($width : width)
$table : Table(room == $room, width > $width, $tablewidth : width)
then
insertLogical(new IntConstraintOccurrence("roomWidthCapacity",
ConstraintType.NEGATIVE_SOFT,
($tablewidth - $width),
$room, $table));
end
//
############################################################################
// Calculate score
//
############################################################################
// Accumulate hard constraints
rule "hardConstraintsBroken"
salience -1 // Do the other rules first (optional, for performance)
when
$hardTotal : Number() from accumulate(
IntConstraintOccurrence(constraintType ==
ConstraintType.NEGATIVE_HARD, $weight : weight),
sum($weight)
)
then
scoreHolder.setHardConstraintsBroken($hardTotal.intValue());
end
// Accumulate soft constraints
rule "softConstraintsBroken"
salience -1 // Do the other rules first (optional, for performance)
when
$softTotal : Number() from accumulate(
IntConstraintOccurrence(constraintType ==
ConstraintType.NEGATIVE_SOFT, $weight : weight),
sum($weight)
)
then
scoreHolder.setSoftConstraintsBroken($softTotal.intValue());
end
-----
with kind regards,
--
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14 years, 2 months
Does Guvnor Support Traits?
by BenjaminWolfe
I'm pretty new to developer forums. If my question is best asked in a
different venue, feel free to point me there. And if it's vague (see the
full version below), please ask clarifying questions. Thank you!
I was just reading in the 5.4 docs about traits, donning the isA keyword...
pretty exciting stuff. It allows me a lot of flexibility as a rule-writer.
But my company's upcoming implementation of Drools is going to feature
Guvnor pretty prominently. (We're in the process of rolling it out.) Does
Guvnor support traits?
I should mention that I'm an analyst, and our developers are new to Drools
and Guvnor as well. Traits are coming up in one of our early projects, as
we consider whether to squish two similar things into the same fact type (so
that we can easily use the same rules on both) or separate them out into
two.
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14 years, 2 months
drools planner ConstraintOccurrence
by Ricardo
Hi,
I am learning drools planner, please explain to me about the
ConstraintOccurrence (Int, Double,Long and Umweighted) object used in the
then part of the drools planner drl file. My doubt is when to use this each
type of this class and how it makes changes in the score calculations.
note: Already search the mailing list, src code and read the user guide but
no details available
best regards,
-----
with kind regards,
--
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14 years, 2 months
Trouble wrapping my head around window.length(1)
by Ladd
I'm new to Drools and have what I think should be a simple use case. But I'm
getting some puzzling results from my tests.
I have a simple class with just a key and value. What I want to detect is
when the last occurrence with key "X" has a value of "ALARM" and the last
occurrence with key "Y" has a value of "ALARM".
Could someone please either educate me or point me to the documentation that
explains how this would be done? Many thanks in advance!!
Here's my test code and results:
*The event class:*
public class MyEvent {
String key;
String value;
public MyEvent( String key, String value ) {
this.key = key;
this.value = value;
}
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
*The test runner:*
@Test
public void testWindowLen1() {
StringBuilder sb = new StringBuilder();
sb.append( "import drools.tests.MyEvent \n" );
sb.append( " \n" );
sb.append( "declare MyEvent @role(event) end \n" );
sb.append( " \n" );
sb.append( "rule \"Any event detected\" \n" );
sb.append( " \n" );
sb.append( "salience 10 \n" );
sb.append( "when \n" );
sb.append( " f : MyEvent() \n" );
sb.append( "then \n" );
sb.append( " System.out.println( \"************ fault seen with key \" +
f.getKey() + \" value \" + f.getValue() ); \n" );
sb.append( "end \n" );
sb.append( " \n" );
sb.append( "rule \"Faults coincide\" \n" );
sb.append( " \n" );
sb.append( "when \n" );
sb.append( " f1 : MyEvent( key == \"faultType1\", value == \"ALARM\" )
over window:length( 1 ) \n" );
sb.append( " f2 : MyEvent( key == \"faultType2\", value == \"ALARM\" )
over window:length( 1 ) \n" );
sb.append( "then \n" );
sb.append( " System.out.println( \"************ both faults are active!
f1.key = \" + f1.getKey() + \" f2.key = \" + f2.getKey() ); \n" );
sb.append( "end \n" );
sb.append( " \n" );
sb.append( "rule \"Faults don't coincide\" \n" );
sb.append( " \n" );
sb.append( "when \n" );
sb.append( " f1 : MyEvent( key == \"faultType1\", value != \"ALARM\" )
over window:length( 1 ) \n" );
sb.append( " or \n" );
sb.append( " f2 : MyEvent( key == \"faultType2\", value != \"ALARM\" )
over window:length( 1 ) \n" );
sb.append( "then \n" );
sb.append( " System.out.println( \"************ at least one fault isn't
active!\" ); \n" );
sb.append( "end \n" );
StatefulKnowledgeSession ksession = null;
KnowledgeBase kbase = null;
KnowledgeBaseConfiguration config =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
config.setOption( EventProcessingOption.STREAM );
kbase = KnowledgeBaseFactory.newKnowledgeBase( config );
ksession = kbase.newStatefulKnowledgeSession();
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newByteArrayResource(
sb.toString().getBytes() ), ResourceType.DRL );
if( kbuilder.hasErrors() ) {
System.err.println( kbuilder.getErrors().toString() );
} else {
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
}
// Inject the first fault = ALARM
MyEvent faultType1Alarm = new MyEvent( "faultType1", "ALARM" );
System.out.println( "Firing fault1 = ALARM" );
ksession.insert( faultType1Alarm );
ksession.fireAllRules();
// Inject the second fault = ALARM
// Want this to trigger the "Faults concide" rule
MyEvent faultType2Alarm = new MyEvent( "faultType2", "ALARM" );
System.out.println( "Firing fault2 = ALARM" );
ksession.insert( faultType2Alarm );
ksession.fireAllRules();
// Inject the first fault = OK
// Want this to trigger the "Faults don't concide" rule
MyEvent faultType1OK = new MyEvent( "faultType1", "OK" );
System.out.println( "Firing fault1 = OK" );
ksession.insert( faultType1OK );
ksession.fireAllRules();
ksession.dispose();
System.out.println( "Done!" );
assert( true );
}
*And the results that have me scratching my head:*
Firing fault1 = ALARM
************ fault seen with key faultType1 value ALARM
************ at least one fault isn't active!
************ at least one fault isn't active!
************ both faults are active! f1.key = faultType1 f2.key = faultType1
Firing fault2 = ALARM
************ fault seen with key faultType2 value ALARM
************ at least one fault isn't active!
************ at least one fault isn't active!
************ both faults are active! f1.key = faultType2 f2.key = faultType2
************ both faults are active! f1.key = faultType2 f2.key = faultType1
Firing fault1 = OK
************ fault seen with key faultType1 value OK
************ at least one fault isn't active!
************ at least one fault isn't active!
************ both faults are active! f1.key = faultType1 f2.key = faultType1
************ both faults are active! f1.key = faultType1 f2.key = faultType2
Done!
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14 years, 2 months
Error deploying drools-spring (5.4.0.Final) on ServiceMix 4.4.1
by Nicholas Hemley
Hello,
I have deployed drools-spring on ServiceMix 4.4.1 and suffer the following error:
java.lang.NullPointerException
at org.apache.felix.framework.resolver.ResolverImpl.toStringBlame(ResolverImpl.java:1521)[org.apache.felix.framework-3.0.9-fuse-07-03.jar:]
at org.apache.felix.framework.resolver.ResolverImpl.checkPackageSpaceConsistency(ResolverImpl.java:943)[org.apache.felix.framework-3.0.9-fuse-07-03.jar:]
at org.apache.felix.framework.resolver.ResolverImpl.resolve(ResolverImpl.java:130)[org.apache.felix.framework-3.0.9-fuse-07-03.jar:]
at org.apache.felix.framework.Felix$StatefulResolver.resolve(Felix.java:4129)[org.apache.felix.framework-3.0.9-fuse-07-03.jar:]
at org.apache.felix.framework.Felix.resolveBundle(Felix.java:3459)[org.apache.felix.framework-3.0.9-fuse-07-03.jar:]
at org.apache.felix.framework.Felix.startBundle(Felix.java:1739)[org.apache.felix.framework-3.0.9-fuse-07-03.jar:]
Nothing further in the log, so I am a bit stumped as to what the actual problem is.
Has anyone successfully deployed drools 5.4.0.Final to ServiceMix 4.4.x, please?
Cheerio,
Nic
Nicholas Hemley
Direct: +44 (0) 117 231 0003
Scott Logic | 10 Victoria Street, Bristol, BS1 6BN
Reception: +44 (0) 117 231 0000
14 years, 2 months