[jboss-jira] [JBoss JIRA] (JBRULES-3144) Experiment with "when rule becomes no longer true execute a callback" feature in Drools Expert

[Geoffrey De Smet (Updated) (JIRA)]

     [ https://issues.jboss.org/browse/JBRULES-3144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Geoffrey De Smet updated JBRULES-3144:
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    Summary: Experiment with "when rule becomes no longer true execute a callback" feature in Drools Expert  (was: Experiment with "when rule becomes true execute a callback" feature in Drools Expert, benchmarked by Drools Planner)

    
> Experiment with "when rule becomes no longer true execute a callback" feature in Drools Expert
> ----------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-3144
>                 URL: https://issues.jboss.org/browse/JBRULES-3144
>             Project: Drools
>          Issue Type: Task
>      Security Level: Public(Everyone can see) 
>          Components: drools-core  (expert), drools-planner
>            Reporter: Geoffrey De Smet
>            Assignee: Geoffrey De Smet
>
> <_conan_> ge0ffrey: can do unfalse situation
> <ge0ffrey> conan: is there a way to get a "when the rule no longer applies, execture this code"?
> <_conan_> ge0ffrey: i.e. when a ruel becomes untrue execute a callback
> <ge0ffrey> conan: yes!
> <_conan_> yes
> <_conan_> it's trivial to do actually
> <ge0ffrey> conan: what's the code name for that feature?
> <_conan_> not related to TMS
> <ge0ffrey> yep
> <_conan_> you can potentially hack one for yourself
> <_conan_> in about 10 minutes
> <ge0ffrey> I 'd also need to have a value which was caclulated in hte the orginal RHS
> <_conan_> but the feature over all will take a lot of thought, due to language design
> <_conan_> but for your use case
> <_conan_> it's trivial to do
> <_conan_> in the rule you have the Activation
> <_conan_> the impl is the AgendaItem
> <ge0ffrey> conan: would love to do this (espeically if I get some appointed time for it :)
> <_conan_> you can do kcontext.getActivation
> <_conan_> it'll take you 15 minutes to do it
> <_conan_> change AgendaItem to have new field reference Callable or what ever you want to use.
> <ge0ffrey> k
> <_conan_> in the consequnce just do agendaItem.addCallable( new Callable() {............ } );
> <_conan_> i.e. use an anonymous class
> <_conan_> the only thing you need to do now
> <_conan_> is in RuleTerminalNode in retractLeftTuple is agendaItem.executeCallables()
> <_conan_> that's it
> <_conan_> it's that trivial
> <ge0ffrey> (copy pasting htis in an issue to look at later, as my workspace is open on my fork today)
> <_conan_> I just don't want to expose that as a generic feature
> <_conan_> because the issue needs more thought
> <ge0ffrey> of course
> <_conan_> with regards to language design
> <_conan_> but for your use case
> <_conan_> and as you are an expert
> <_conan_> it's fine
> <_conan_> I'd suggest you just maintain a "patched" version of drools for that feature
> <ge0ffrey> but if the exeperiment works well, we can look at language design
> <_conan_> yes
> <_conan_> I need this anyway
> <_conan_> becausae rule engines need to tell peopl when things stop being true
> <ge0ffrey> conan: not going to start using for released planner until it's in drools expert for real

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