2009/10/29 richarda <richard.ambridge@gmail.com>

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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