[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1430) Improve Function feature

[one legged (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBRULES-1430?page=comments#action_12399736 ] 
            
one legged commented on JBRULES-1430:
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How would one do that from a rule, if "workingmemory" is not a reserved word in DRL language?

http://downloads.jboss.com/drools/docs/4.0.4.17825.GA/html_single/index.html#d0e2641

Would it be better for the engine to automatically pass that and have it part of the Function interface, so that "workingmemory" doesn't have to be a reserved word and change the parser? It's common in machine learning applications to have a Meta rule that creates new rules. To do this in clips and JESS is trivial.

I suppose one could statically pass the workingmemory object to the functions, but that feels a bit hack-ish.

> Improve Function feature
> ------------------------
>
>                 Key: JBRULES-1430
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1430
>             Project: JBoss Drools
>          Issue Type: Feature Request
>      Security Level: Public(Everyone can see) 
>          Components: All
>    Affects Versions: 4.0.4
>         Environment: all
>            Reporter: longDuck dong
>            Priority: Minor
>
> The current design of the Function is a bit limiting. for example, if I want to write a function to insert, update or retract facts, the current design does not support it. According to the docs http://downloads.jboss.com/drools/docs/4.0.4.17825.GA/html/ch06s04.html, functions are just helper methods. It would be more powerful if the function always passes the workingmemory to the function. This way, the functions can easily access the globals or access the rule engine. Basically, something similar to JESS funcall http://herzberg.ca.sandia.gov/docs/70/api/jess/Funcall.html.
> It also makes it easier for developers to encapsulate common actions in the consequence in a function and use it easily from a DSL. The pattern is well proven in CLIPS, JESS and haley.

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