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

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