[rules-users] declare variable

[fakhfakh ismail]

hello 
first thank you for your help.
But I don't know how declare the wariable.
workingMemory.setGlobal("L", new java.util.List());
the code used to execute my rule is :

  public List fireRules(List dataObjects, InputStream rules) throws Exception {      
    // obtain the rule service provider
            RuleServiceProviderManager.registerRuleServiceProvider(
         "org.drools.jsr94.rules.RuleServiceProviderImpl",
         org.drools.jsr94.rules.RuleServiceProviderImpl.class);
         RuleServiceProvider service = 
         RuleServiceProviderManager.getRuleServiceProvider(
         "org.drools.jsr94.rules.RuleServiceProviderImpl");        
    // load the rule adminstrator  
        RuleAdministrator admin = service.getRuleAdministrator();   
    // load the rules and register them   
         RuleExecutionSet res1 =
         admin.getLocalRuleExecutionSetProvider( null ).
         createRuleExecutionSet( rules, null );
         rules.close();       
         String bindUri = "res:://sample.drl";
         admin.registerRuleExecutionSet(bindUri, res1, null);   
    // obtain a rule runtime object from the rule service provider   
         RuleRuntime runtime = service.getRuleRuntime();  
   // create a stateless object from the Rule Runtime       
         StatelessRuleSession session = (StatelessRuleSession)
         runtime.createRuleSession(bindUri, null, RuleRuntime.STATELESS_SESSION_TYPE);    
         List resultRules = session.executeRules(dataObjects);
    //session.
         session.release();
     //    workingMemory.setGlobal("L", new java.util.List());        
         return resultRules; 
    }
please help me,
best regards 
Ismail

Scott Reed <sreed at spamcop.net> a écrit : fakhfakh ismail's message received 5/14/2007 3:48 PM:
> Hello,
> first sorry for my bad english.
> I want to declare a variable of type List
> 
> rule "userrole"
>  
> when
>   $user1: User (userid1: userId)
>   $user2: User (userId == userid1)
>   then
>      List L = new ArrayList();
>         if (L.contains($user1.getname())== false)
>         {
>             L.add($user1.getname());
>             System.out.println("hello");
>         }
>     end
> 
> the problem is everytime the List don't save all element every execution 
> the variable  list is intialised as empty is there other place to 
> declare List?
> (I try after when but error of parsing)

You need to declare the List in your Java code, set it as a Drools global, and declare it in the DRL 
file:

In yourjava.java:
-----------
workingMemory.setGlobal("L", new java.util.List());
-----------

in yourdrl.drl:
-----------
global java.util.List L;

rule "userrole"

when
   $user1: User (userid1: userId)
   $user2: User (userId == userid1)
   then
         if (L.contains($user1.getname())== false)
         {
             L.add($user1.getname());
             System.out.println("hello");
         }
end
-----------

Wouldn't it be great to have a "static" section in the DRL syntax for temporaries like this?
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