[jboss-jira] [JBoss JIRA] (DROOLS-3853) Ability to override existing rules in one KIA base with rules from another KIE base

[Vaclav Carnogursky (Jira)]

     [ https://issues.jboss.org/browse/DROOLS-3853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vaclav Carnogursky updated DROOLS-3853:
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    Summary: Ability to override existing rules in one KIA base with rules from another KIE base  (was: Ability to override existing rules with rules)


> Ability to override existing rules in one KIA base with rules from another KIE base
> -----------------------------------------------------------------------------------
>
>                 Key: DROOLS-3853
>                 URL: https://issues.jboss.org/browse/DROOLS-3853
>             Project: Drools
>          Issue Type: Feature Request
>          Components: core engine
>            Reporter: Vaclav Carnogursky
>            Assignee: Mario Fusco
>            Priority: Minor
>
> I would be nice to have ability to override a rule defined in one KIE base with a rule defined in another KIE base. In Drools 5 it was possible to misuse a bug which didn't check for identical rules named to override them by using the same rule name with an appropriate drl file load order.
> This has already been brought up here but I think an actual feature
> request was never created https://groups.google.com/forum/#!searchin/drools-usage/overriding%7Csort:date/drools-usage/mvpBoVFZblk/FX-vkYxHBQAJ
> *Use case*
> Need to build a layered set of rules where extending layers may need to
> override existing rules in the lower layers. I want to avoid rule duplication
> (majority of rules would have to be duplicated) so prefer the layers.
> *Usage*
> Annotate a rule with {{@Override}}.
> *Workaround*
> Beyond the obvious rule packaging change to copy all rules instead of building layers I think it would be possible to do following:
> To override a conflicting rule the resulting facts must be inserted logically 
> and rules annotated as {{@Defeasible}}. An overriding rule must have {{@Defeats("base rule")}}.
> This approach might not work for all scenarios.



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