[rules-users] Collect and hibernate

[richarda]

Hi again,

I wish to have a rule that when an Event has a certain uuid then load into
working memory all other events that have been received for this unit...

So I write the rule:

rule "Repeating"

	when
		 $m : MessageAsEvent(uuid=="mesC:7")
   		 $others : LinkedList() from collect (
   		 	   MessageAsEvent(uuid=="mesC:7", id!=$m.id) 
   		 	       from hibernateSession.createQuery("from MessageAsEvent where
serial=?").setParameter(0,$m.serial).list()
   		 	)         
	then 
		System.out.println("Gathering m="+$m+" data="+$others);	
end


Audit log shows: (wish cut and paste would work from Eclipse audit view)

  <activationId>Repeating [131, 14]</activationId>
  <rule>Repeating FAN</rule>
  <declarations>$others=[MessageAsEvent:[124] uuid=mesC:7 serial=serial123
count=7, MessageAsEvent:[94] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[64] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[118] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[112] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[106] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[100] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[88] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[82] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[76] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[70] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[58] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[52] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[46] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[40] uuid=mesC:7 serial=serial123 count=7,
MessageAsEvent:[34] uuid=mesC:7 serial=serial123 count=7](131);
$m=MessageAsEvent:[130] uuid=mesC:7 serial=serial123
count=7(14)</declarations>
  <ruleFlowGroup>Gathering</ruleFlowGroup>



So, you can see that the rule fired with $others having all the data,  and
$m being the main uuid


but the output of the rule is:
Gathering m=MessageAsEvent:[130] uuid=mesC:7 serial=serial123 count=7
data=null

so, the $others has been translated to a null.

I'm trying to copy the Expert example:

import java.util.LinkedList;

rule "Send a message to all mothers"
when
    $town : Town( name == 'Paris' )
    $mothers : LinkedList() 
               from collect( Person( gender == 'F', children > 0 ) 
                             from $town.getPeople() 
                           )
then
    # send a message to all mothers
end

which indicates that $mothers will be available in the RHS

for reference, the audit log shows when the rule fires:


<org.drools.audit.event.ActivationLogEvent>
  <type>6</type>
  <activationId>Repeating [-1, 14]</activationId>
  <rule>Repeating FAN</rule>
  <declarations>$m=MessageAsEvent:[130] uuid=mesC:7 serial=serial123
count=7(14)</declarations>
  <ruleFlowGroup>Gathering</ruleFlowGroup>


What am I doing wrong?
I basically want all the MessageAsEvent added to working memory, so later
other rules will do work on all the events.

Cheers
Ric

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