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https://issues.apache.org/jira/browse/MINIFICPP-930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16872354#comment-16872354
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Mr TheSegfault commented on MINIFICPP-930:
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Of note is that Controller Services do have access to minifi.properties and
properties defined by said controller service, but no way to evaluate those
properties using EL ( if it is built ).
> Add expression language support to Controller Services
> ------------------------------------------------------
>
> Key: MINIFICPP-930
> URL: https://issues.apache.org/jira/browse/MINIFICPP-930
> Project: Apache NiFi MiNiFi C++
> Issue Type: Improvement
> Reporter: Daniel Bakai
> Priority: Minor
>
> Controller Services should probably have EL capabilities. Currently there is
> no concept of ConfigurationConcept – but this has the same effective
> interface as a ProcessContext. The annotations in NiFi make it easy to
> schedule these elements, but we can simply do this in the controller services
> prior to being enabled.
> Probably a pretty low priority since Controller Services aren't written very
> frequently in MiNiFi C++ – but there is also a gap in that properties could
> be defined that support EL without the ability to execute them. We should
> fill this gap on a time frame that makes sense .
>
> While this was a previously known gap I've forgotten about this myself which
> implies we probably would be doing a disservice to developers and users who
> expect this capability.
> Initially identified by [~bakaid]
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