[rules-users] About FactHandle

[Anstis, Michael (M.)]

As per the documentation:-
 
"Globals are named objects that can be passed in to the rule engine; without
needing to assert them. Most often these are used for static information, or
services that are used in the RHS of a rule, or perhaps a means to return
objects from the rule engine. 
      
new List list = new ArrayList;
workingMemory.setGlobal("list", list);
      
The global definition must be defined in the Rule Base and of the same type,
otherwise a runtime exception will be thrown. If a rule evaluates on a
global before you set it you will get a NullPointerException".
 
>From this I take that they are not inserted implicitly.
 
>From what I understand Globals are not Facts and hence do not have
FactHandles.
 


  _____  

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of
prateek.katiyar at wipro.com
Sent: 04 October 2007 10:57
To: rules-users at lists.jboss.org
Subject: [rules-users] About FactHandle


Hi
 
I am using Drools 4.0.
As per the Drools 4.0 documentation if we are declaring a object as global
then we can not use "insert(java.lang.Object Object)" method on this object.
It will be inserted implecetly.Now if we want to update this object in the
RHS part of our rule file then we need the "FactHandle" for the object.
Now as we know that the return type of "setGlobal(java.lang.String
identifier, java.lang.Object value)" method is "void".
So please tell me that how can i update this object in my rule file? 

Thanks.
 
With Regards
Prateek Katiyar

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