Re: [rules-users] Initialize Global
I have the same "problem", but eval(objectList == null) doesn't work. If
I don't execute "drools.getWorkingMemory().setGlobal()" it "works
fine",
as if the rule activates and the object is null.
global List objectList;
rule "Start"
salience 101
when
#conditions
then
objectList = new ArrayList() ;
objectList.add("1");
objectList.add("2");
System.out.println("Start objectList:"+objectList);
//drools.getWorkingMemory().setGlobal("objectList", objectList);
end
rule "end"
salience 97
when
eval (objectList == null)
then
System.out.println("End objectList: "+objectList);
end
gives:
Start objectList:[1, 2]
End objectList: null
Next I uncomment the "drools.getWorkingMemory().setGlobal("objectList",
objectList);" and run the rule again an get:
Start objectList:[1, 2]
End objectList: [1, 2]
so the objectList isn't null, but the rule still activates...
Kris Verlaenen schreef:
> That initialized my global but the rule still runs every
execution.
> Can I
> disable the rule after the first execution?
What do you mean by "every execution". A rule should only be executed
once, unless it gets reactivated (which should not be the case in this
situation).
> I would like to use (if (objectList==null)). My list is not
> immutable. Can
> I make a similar rule for the LHS?
You can test whether the global is null using eval( objectList == null
) in the LHS of the rule.
Kris
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