Re-sending : Unexpected MVEL plus operator behavior (string-to-double), in consequence block
by Kinshuk Adhikary
Using
drools 5.1
mvel 2-2.0.14
In consequence (then) block : (dialect strict or not does not make a difference)
Trying to sum up some numbers after a multiplication operation. For example :
t.out = t.in2*t.in3 + t.in3*t.in4 + t.in2*t.in4;
(the object t has all its attributes of the type String), all the t.in parameters are actually numbers-as-strings.
So the multiplication is going on fine, as expected, but the addition (+) sign, is concatenating instead of adding.
So the for inputs "1", "2" and "3", the result looks something like : 2.06.03.0 (i.e concetenated) instead of the expected 11.0.
What is going worng How does the + operator decide to do concat instead of doing addition.
Any documentation on this + operator logic ?
Note : The above works fine when I use MVEL without Drools.
Thanks
14 years, 11 months
functions
by Chris Richmond
Ok.I am trying to build a function library in my .drl file and I added this
one test function
function String outputString(String sData){
return sData;
}
And no matter where I place this in my .drl file, I get an exception one way
or the other with compiling when I try instaniate and fire my rules. The
.drl file works exactly as expected if I remove this function declaration,
and when I *do* try to add it, I do not actually call it anywhere.but get
those errors.
So my question is, where exactly do I need to place function declarations..
Thanks,
Chris
14 years, 11 months
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14 years, 11 months
Unexpected MVEL + operator behavior (string<->double), in consequence block
by Kinshuk Adhikary
Using
drools 5.1
mvel 2-2.0.14
In consequence (then) block : (dialect strict or not does not make a difference)
Trying to sum up some numbers after a multiplication operation. For example :
t.out = t.in2*t.in3 + t.in3*t.in4 + t.in2*t.in4;
(the object t has all its attributes of the type String), and all the t.in parameters are actually numbers-as-strings.
So the multiplication is going on fine, as expected, but the addition (+) sign, is concatenating instead of adding.
So the for inputs "1", "2" and "3", the result looks something
like : 2.06.03.0 (i.e concetenated) instead of the expected 11.0.
What is going worng How does the + operator decide to do concat instead of doing addition.
Any documentation on this + operator logic ?
Note : The above works fine when I use MVEL without Drools.
Thanks
14 years, 11 months
Inconsistent results in fusion
by RichardA
Hi all again,
I am having a problem where the results of the rules is not consistent.
I am using rules flow and fireUntilHalt..
Here is most of my code: (expanding the default drools example)
private static KnowledgeBase readKnowledgeBase() throws Exception {
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add(ResourceFactory.newClassPathResource("Sample.drl"),
ResourceType.DRL);
kbuilder.add(ResourceFactory.newClassPathResource("Flow.rf"),
ResourceType.DRF);
KnowledgeBuilderErrors errors = kbuilder.getErrors();
if (errors.size() > 0) {
for (KnowledgeBuilderError error: errors) {
System.err.println(error);
}
throw new IllegalArgumentException("Could not parse knowledge.");
}
KnowledgeBaseConfiguration conf =
KnowledgeBaseFactory.newKnowledgeBaseConfiguration();
conf.setOption(EventProcessingOption.STREAM);
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(conf);
kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
return kbase;
}
public static final void main(String[] args) {
try {
// load up the knowledge base
KnowledgeBase kbase = readKnowledgeBase();
final StatefulKnowledgeSession ksession =
kbase.newStatefulKnowledgeSession();
new Thread(new Runnable() {
public void run() {
ksession.fireUntilHalt();
}
}, "FireAllRules").start();
// go !
for(int i=0;i<50;i++){
Message message = new Message();
message.setMessage("one");
ksession.insert(message);
ksession.startProcess("myflow");
}
System.out.println("Sleeping");
Thread.sleep(20000);
System.out.println("Halt");
ksession.halt();
} catch (Throwable t) {
t.printStackTrace();
}
}
So, notice fireUntilHalt is started in a thread.
And its in STREAM mode
and I use flow group and sample rules set.
Then inject 50 messages, and after each inject start the 'myflow'
The rule flow is like this;
Start-> One -> Two -> Three -> End
and the rules are:
rule "One"
ruleflow-group "One"
when
m : Message( message=="one" )
then
m.setMessage( "two" );
update( m );
end
rule "Two"
ruleflow-group "Two"
when
m : Message( message=="two" )
then
m.setMessage( "three" );
update( m );
end
rule "NotThree"
ruleflow-group "Three"
when
m : Message( message!="three" )
then
System.out.println( "Message is not three????????????" );
retract(m);
end
rule "Three"
ruleflow-group "Three"
when
m : Message( message=="three" )
then
retract(m);
end
So, from that you should see that as an object is injected it has
message=="one"
so flow group One should match, the message updates to 'two'
then flow group two should match, message updates to 'three'
and then the group three rule Three should match and the object retracted.
Sometimes I run this I get results as expected.
Other times I get 1 message hit the 'NotThree' rule.
Other times I get lots of them hit the 'NotThree' rule.
Sometimes I get;
Exception in thread "FireAllRules"
org.drools.runtime.rule.ConsequenceException: org.drools.FactException:
Retract error: handle not found for object: null. Is it in the working
memory?
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23)
Its driving me mad as my project is failing due to inconsistent results.
Please help..
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14 years, 11 months
ProcessInstance Does Not Complete With User Task and Rule Task
by nfox241
I have a flow: start -- User Task - Rule Task - User Task - Action - end.
I complete the 1st User Task, next the rules which are part of the
RuleFlowGroup in the Rule Task fire correctly, then I complete the next User
Task. However, my final action node is never reached and the processInstance
never completes.
Here is my Rule Flow:
?xml version="1.0" encoding="UTF-8"?>
<process xmlns="http://drools.org/drools-5.0/process"
xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
xs:schemaLocation="http://drools.org/drools-5.0/process
drools-processes-5.0.xsd"
type="RuleFlow" name="droolsflow" id="org.plugtree.labs.droolsflow"
package-name="org.plugtree.labs" >
<header>
<imports>
<import name="org.plugtree.labs.variablepersistence.MyEntity" />
<import
name="org.plugtree.labs.variablepersistence.MyVariableSerializable" />
</imports>
</header>
<nodes>
<ruleSet id="17" name="ruleMe" x="410" y="123" width="80" height="48"
ruleFlowGroup="fox" />
<start id="1" name="Start" x="16" y="16" width="48" height="48" />
<end id="3" name="End" x="665" y="312" width="48" height="48" />
<humanTask id="23" name="User Task" x="279" y="237" width="100"
height="48" >
<work name="Human Task" >
<parameter name="ActorId" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Comment" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Content" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Priority" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Skippable" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="TaskName" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
</work>
</humanTask>
<humanTask id="22" name="User Task" x="145" y="86" width="100"
height="48" >
<work name="Human Task" >
<parameter name="ActorId" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Comment" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Content" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Priority" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="Skippable" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
<parameter name="TaskName" >
<type
name="org.drools.process.core.datatype.impl.type.StringDataType" />
</parameter>
</work>
</humanTask>
<actionNode id="12" name="Finish" x="494" y="254" width="80" height="48"
>
<action type="expression" dialect="mvel"
>System.out.println("Finished!!!");</action>
</actionNode>
</nodes>
<connections>
<connection from="22" to="17" />
<connection from="12" to="3" />
<connection from="17" to="23" />
<connection from="1" to="22" />
<connection from="23" to="12" />
</connections>
</process>
And test code:
KnowledgeBuilder kbuilder =
KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( new ClassPathResource(
"VariablePersistenceStrategyProcess.rf" ), ResourceType.DRF );
kbuilder.add( new ClassPathResource( "myRules.drl" ),
ResourceType.DRL );
for (KnowledgeBuilderError error: kbuilder.getErrors()) {
System.out.println(error);
}
KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );
EntityManagerFactory emf =
Persistence.createEntityManagerFactory("org.drools.persistence.jpa");
Environment env = KnowledgeBaseFactory.newEnvironment();
env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);
StatefulKnowledgeSession ksession =
JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env );
int id = ksession.getId();
System.out.println("### Starting process ###");
WorkflowProcessInstance processInstance = (WorkflowProcessInstance)
ksession.startProcess( "org.plugtree.labs.droolsflow"
/*,parameters*/ );
TestWorkItemHandler handler = TestWorkItemHandler.getInstance();
WorkItem workItem = handler.getWorkItem();
ksession = JPAKnowledgeService.loadStatefulKnowledgeSession( id,
kbase, null, env );
processInstance = (WorkflowProcessInstance)
ksession.getProcessInstance( processInstance.getId() );
ksession.getWorkItemManager().completeWorkItem( workItem.getId(),
null );
workItem = handler.getWorkItem();
ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(id,
kbase, null, env);
processInstance = (WorkflowProcessInstance)
ksession.getProcessInstance(processInstance.getId());
System.out.println("### Completing second work item ###");
ksession.getWorkItemManager().completeWorkItem(workItem.getId(), null);
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14 years, 11 months
timestamps fusion
by Khalil Hafsi
Hi Guys,
I am using last version of fusion.
do events in stream mode get automatic timestamps ? do I need to change
my Event class like in the broker example (in the way of
Event<stockTick> ) ?
class Event{
int symbol;
int load;
}
say if I have a simple code :
..drools initiation.. (stream mode)
session.insert(event(1,10))
session.insert(event(1,20))
session.insert(event(1,30))
should I for every new event fireallRules ?
What about salience , where can I get documentation about it ?
Thank you,
h-
14 years, 11 months
Possible bug in ruleflow result mappings
by nuzz
Hi everyone,
I have setup a ruleflow. Within that ruleflow I have create a custom
workflow item Handler. At the completion of execution I am calling:
manager.completeWorkItem(workItem.getId(), results);
Where results contains an item called batchRequest which is a map. Now I
want to map this batchRequest into a variable called model. It does NOT
work. It will only map if the variable I'm mapping to is called
batchRequest, the same as the item I'm reading from results map. I'm pretty
certain I should be able to map into a variable with a different name....
This is very frustrating as I have to then have an action node next to map
it into model so that I can continue.
Thanks
P.
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14 years, 11 months
Returned mail: Data format error
by Post Office
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14 years, 11 months
