I thought use of the "from" keyword allowed you to reason over facts (potentially) not in WM. I believe the OP's example is mentioned in the docs?

sent on the move

On 31 Oct 2011 15:08, "Wolfgang Laun" <wolfgang.laun@gmail.com> wrote:

Globals cannot to be used - directly or indirectly - as objects that should trigger
the firing of rules. It is only insert, modify or update, and retract that cause (re-)evaluation of LHS conditions.

-W

On 31 October 2011 15:05, elsdestickere <elsdestickere@yahoo.com> wrote:

Hi,

I read docs about global and Hibernate to access your DB from the rules.
I tried something simular for in memory DAO's.
But some rules fire ("WM" in RHS) as the DAO has 3 items, but others ("dao"
in LHS) don't, how is that possible?

global RepositoryFactory repFact;
rule "dao"
   when
      k : Customer(  ) from repFact.getCustomerRepository().findAll();
   then
       System.out.println( "Drools "+drools.getRule().getName()+": "
+k.getName());
end
rule "WM"
   when
      k : Customer(  ) ;
   then
       System.out.println( "Drools "+drools.getRule().getName()+": "
+k.getName()+" + size: "+repFact.getCustomerRepository().findAll().size());
end
...
RepositoryFactory repFact = Registry.getRepositoryFactory();
ksession.setGlobal("repFact", repFact);
...
CustomerRepository customerRepo = Registry.getRepositoryFactory()
                               .getCustomerRepository();
customerRepo.add(tom);
customerRepo.add(elise);
customerRepo.add(bert);
ksession.insert(bert);
ksession.fireAllRules();

...
Output:
Drools WM: Bert + size: 3

br,
Els


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