[rules-users] Initialize Global

[java_user_]

Yes, I used the conditional eval(objectList == null)
The global keeps getting destroyed after each execution.  I am using a
stateful rule session.  I was hoping the global could be reused for each
execution without having to re-init.

I was able to do this in Jess by instantiating the global without having to
use a rule.  Then I was able to use the same list each execution of my
stateful session without having to recreate the list.  The Jess list is an
internal Jess object and not a Java ArrayList.
Jess Code to declare and initialize a global list:
(defglobal ?*objectList* = 
    (create$
		  (new String  "s0") 
  		  (new String  "s1") 
	)
)



Anstis, Michael (M.) wrote:
> 
> Did you try Kris's suggested LHS?
> 
>> You can test whether the global is null using eval( objectList == null ) 
>> in the LHS of the rule.
> 
> This should provide the condition you request and prevent the rule from
> firing after the global has been initialised.
> 
> -----Original Message-----
> From: rules-users-bounces at lists.jboss.org
> [mailto:rules-users-bounces at lists.jboss.org] On Behalf Of java_user_
> Sent: 30 October 2007 16:06
> To: rules-users at lists.jboss.org
> Subject: Re: [rules-users] Initialize Global
> 
> 
> Hi Kris,
> 
> I am using a JSR94 stateful session.  My design is to initialize the
> global
> list once and reuse it within the same session.  
> 
> The init-global rule is being executed each execution because there is no
> conditional statement.  Can I disable the rule for future executions?
> 
> Thanks
> 
> 
> 
> Kris Verlaenen wrote:
>> 
>>> 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 
>> 
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>> 
>> 
> 
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