Could anyone suggest alternate approach
by Lindy hagan
Please ignore my previous email as I did not include subject.
I have 4 drl files in my app. Loading all the 4 during application startup.
If any rule is satisfied in File 1,I don't want File 2 be called.Should
execute File 3 and 4.
Similarly If rules in File 1 is not satisfied,want to call File 2 then File
3 and 4.
At present I am doing this way.Please let me know if this is ok or if there
is any better solution.
Set an attribute when a rule is satisfied. (attribute is not dummy,I need it
in my app)
Attribute is checked in each and every if it is null.
Example File1.drl contains 2 rules.If first rule is satisfied, don't want to
execute second rule.So setting rule with a valid number.
File1.drl
rule "1.Age Factor and Junior"
when
d : CustomerDetail( rule == "" && sale == 'Junior' && age in
("16","17"))
then
System.out.println("Junior and Age Satisfied ");
d.setRule("1");
end
rule "2.Junior only Age Factor"
when
m : CustomerDetail( rule == "" && age in ("16","17"))
then
System.out.println("Only junior Age satisfied.");
m.setRule("2");
end
File2.drl
rule "3.Age Factor and Senior"
when
d : CustomerDetail( rule == "" && sale == 'Senior' && age in
("70","75"))
then
System.out.println("Senior and Age Satisfied ");
d.setRule("10");
end
rule "4.Senior only Age Factor "
when
m : CustomerDetail( rule == "" && age in ("70","75"))
then
System.out.println("Only senior Age satisfied.");
m.setRule("11");
end
This one works but I see these disadvantages:
1)If the rule 1 is satisfied, rule2 is still executed.Similary all the rules
in File2.drl.
2)Might impact performance all the 4 rules are called all time.
Any suggestions?
16 years, 7 months
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16 years, 7 months
Re: [rules-users] Drools Flow :Persistence Problem : Restore StatefulKnowledgeSession from database
by Pardeep.Ruhil＠lntinfotech.com
Hi Salaboy,
Thanks for you replying.
Yes, of course it is storing multiple process instance Id in the database.
But, what I feel is that it will fail when I am trying to run two workflow
at the same time simultaneously, using the same code by dynamically
providing the workflow name and the parameters for each of them.
Ideally there should be two entries for the StatfulKnowledgeSession object
because when I try to load the StatefulKnowledgeSession object from the
database it will give me the session object of the workflow which is last
executed.
For example lets suppose I have two workflow 1 and 2 having two humantask
in each of them . So when I finish the first Human Task of both workflow
one by one. SessionInfo present in the database is of workflow 2 (if 2
is executed last). Because there is no field in the sessioninfo entity of
the database regarding to which workflow it belongs to. Am I right ?
So when I try to finish the 1st workflow by executing the 2nd humantask
left in it , I need to reload the StatfulKnowledgeSession object from the
database. As there is no way of distinguishing that the session object
store in the database is of which workflow , there might be a problem as I
may get the ksession object of 2nd workflow.
In case of Process Instance it is fine , because there is a field
'processId' which will distinguish which processInstanceId belongs to
which worklowId or processId.
But in case of Session , there is noting as such.
I don't what I am saying is handled in drools persistence. Please let me
know if it there or not.
Thanks & Regards
Pardeep Ruhil
______________________________________________________________________
16 years, 8 months
Does Session effeciently filter unused facts, or...
by Barry Kaplan
... should I put a filter before insert().
I will have lots of events coming from hardware devices, only some of which
be applicable to a given session instance. I've tried extracting the
declared types from the packages, but that doesn't include classes used in
patterns which where only imported. So determine the actual set of event
classes used by a given set of packages seems not to be so easy.
I've drilled down to EntryPointNode.assertObject......
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16 years, 8 months
RestFule example
by Qian, Tony
All,
I have installed Drools Execution Server and try to figure out how to use execution server as stateless web service. I have a few questions:
1) I checked out the all examples in the document. I didn't see any examples using RestFul web service. Is there any example out there?
2) By looking at the Sample request content and response content, I cannot figure out what this example tries to tell us. Detail explanation would be really appreciated, especially for new user.
3) In the example, which part works as 'fact Model' (inOutFacts, inFacts), the data we try to apply rule on? What is inFacts used for?
4) If I only need to apply rule to a single object, how do I use restful web service? For example, I have an object Model
Person {
firstName
LastName
Gender
}
My rule is to check the first name. If first name is "Jenny", set gender to "F" and return the Person Object. How can I use Drools Execution Server to do that? (Of cource I have to deploy knowledgebase generated from Guvnor first).
Thanks,
Tony
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16 years, 8 months
(no subject)
by Lindy hagan
I have 4 drl files in my app. Loading all the 4 files during application
startup.
If any rule is satisfied in File 1,I don't want File 2 be called.Should
execute File 3 and 4.
If rules in File 1 is not satisfied,want to call File 2 then File 3 and 4.
At present I am doing this way.Please let me know if this is ok or if there
is any better solution.
Set an attribute when a rule is satisfied. (attribute is not dummy,I need it
in my app)
Attribute is checked in each and every if it is null.
Example File1.drl contains 2 rules.If first rule is satisfied, don't want to
execute second rule.So setting rule with a valid number.
File1.drl
rule "1.Age Factor and Junior"
when
d : CustomerDetail( rule == "" && sale == 'Junior' && age in
("16","17"))
then
System.out.println("Junior and Age Satisfied ");
d.setRule("1");
end
rule "2.Junior only Age Factor"
when
m : CustomerDetail( rule == "" && age in ("16","17"))
then
System.out.println("Only junior Age satisfied.");
m.setRule("2");
end
File2.drl
rule "3.Age Factor and Senior"
when
d : CustomerDetail( rule == "" && sale == 'Senior' && age in
("70","75"))
then
System.out.println("Senior and Age Satisfied ");
d.setRule("10");
end
rule "4.Senior only Age Factor "
when
m : CustomerDetail( rule == "" && age in ("70","75"))
then
System.out.println("Only senior Age satisfied.");
m.setRule("11");
end
This one works but is it possible , If the rule 1 is satisfied, rule2 is
still executed.Is there any way we can stop rule2 from beinge executed?
Similary stop File2.drl being executed. Any suggestions?
16 years, 8 months
(no subject)
by Jason Smith
SUMMARY:
I am getting a NPE when using modify() with a JavaBean that implements PropertyChangeSupport.
I have included the original source and a proposed fix. Stack trace is also included.
This applies to Drools 5.0.1, and has been verified to also be a problem for 5.1.0.M1.
DETAIL:
I have a rule that looks like this:
rule "Constrain to owner or published to public"
when
$fact : ListFact(
path not matches ".*owner.*",
noopResponse == true
)
then
modify($fact)
{
setPath( "[owner/username='' or publishlist/publish='All Users']")
}
end
The $fact is a JavaBean that implements PropertyChangeSupport, and I've verified that everything is working correctly at the bean level. When I run this rule, I get this exception:
Caused by: java.lang.NullPointerException:
at org.drools.common.EqualityKey.removeFactHandle(EqualityKey.java:109)
at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1435)
at org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1350)
at org.drools.common.AbstractWorkingMemory.propertyChange(AbstractWorkingMemory.java:1577)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
at com.infotrustgroup.rules.RestFact.setPath(RestFact.java:264)
at com.infotrustgroup.facts.ParametersFact.setPath(ParametersFact.java:105)
at com.infotrustgroup.facts.ParametersFact.setPath(ParametersFact.java:74)
at com.infotrustgroup.what.Rule_Constrain_to_owner_or_published_to_public_0.consequence(Rule_Constrain_to_owner_or_published_to_public_0.java:12)
at com.infotrustgroup.what.Rule_Constrain_to_owner_or_published_to_public_0ConsequenceInvoker.evaluate(Rule_Constrain_to_owner_or_published_to_public_0ConsequenceInvoker.java:23)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934)
... 38 more
The offending line is marked below. It looks like maybe "this.instances" is null in the "else" clause.
public void removeFactHandle(final InternalFactHandle handle) {
if ( this.handle == handle ) {
if ( this.instances == null ) {
this.handle = null;
} else {
this.handle = (InternalFactHandle) this.instances.remove( 0 );
if ( this.instances.isEmpty() ) {
this.instances = null;
}
}
} else {
***this.instances.remove( handle );***
if ( this.instances.isEmpty() ) {
this.instances = null;
}
}
}
It looks like someone else ran into this problem before, but only fixed it for the "if" portion, not the "else" portion. I modified the code as follows, and this seems to fix the NPE. Basically, I followed the pattern from the "if" portion.
public void removeFactHandle(final InternalFactHandle handle) {
if ( this.handle == handle ) {
if ( this.instances == null ) {
this.handle = null;
} else {
this.handle = (InternalFactHandle) this.instances.remove( 0 );
if ( this.instances.isEmpty() ) {
this.instances = null;
}
}
} else {
if(this.instances == null)
{
this.handle = null;
}
else
{
this.instances.remove( handle );
if ( this.instances.isEmpty() ) {
this.instances = null;
}
}
}
}
Please read around the formatting. Can someone verify if this is a correct fix, and if it should be applied to the codebase? It seems to work for me. It does not break any unit tests in drools-core 5.0.1 either.
Jason Smith
Software Engineer
InfoTrust Group, Inc.
500 Discovery Parkway, Suite 200
Superior, CO 80027
Office 303-627-6571
Fax 303-666-6711
Email jsmith(a)infotrustgroup.com<mailto:jsmith@infotrustgroup.com>
WEB www.infotrustgroup.com<http://www.infotrustgroup.com/>
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16 years, 8 months
Drools Flow 5.1.0.M1 - Persistence - WorkItemInfo Entity
by Vijay K Pandey
I have a question related to the (Drools Flow 5.1.0.M1 - Persistence) on the data that gets stored as part of the org.drools.persistence.processinstance.WorkItemInfo.
a) If I am using variable persistence strategy - and I pass a JPA Entity(stored in its own table) to a session.startProcess("", map) and map this entity variable to a parameter in the work item node - then this entity will get stored in the WorkItemInfo table as a part of the serialized form in the column (workItemByteArray). So if that is true we have got the same data stored twice? Is this correct?
b) If "a" is true how can we avoid storing in the WorkItemInfo - is there somehow we can map the JPA entity to the WorkItemInfo - so that it doesn't gets stored twice?
Thanks
Vijay
16 years, 8 months
Starting Procss instance from outside of the GWT console
by ramram8
Hi all
I have the following question and I was wondering if someone can help me?
can we initiate a new process instance in the GWT console without using the
start button?
can we start this process from a call from outside of the application by
using a specific API and passing to it parameters?
I have the following process : START -> USER TASK -> MAIL -> END
i need to start this process from outside the application so that the used
when logging into the gwt console can see that he have a task to validate?
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16 years, 8 months
