[jira] [Resolved] (NIFI-1380) Provide Expression Language scoping for properties

["Mike Thomsen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/NIFI-1380?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mike Thomsen resolved NIFI-1380.
--------------------------------
    Resolution: Duplicate

I think this ticket was already done by the work that added the ExpressionLanguageScope functionality.

> Provide Expression Language scoping for properties
> --------------------------------------------------
>
>                 Key: NIFI-1380
>                 URL: https://issues.apache.org/jira/browse/NIFI-1380
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Aldrin Piri
>            Priority: Minor
>
> Expression Language when applied to a property via a PropertyDescriptor can have different contexts in how it is applied.  In one case, this can make use of just System Environment variables or JVM properties.  However, if applied using the evaluateAttributeExpressions(FlowFile) method, this is done on a per FlowFile basis.
> Ideally we could provide some way for extension developers to communicate the intent of how these properties will be used.
> Perhaps adjusting PropertyDescriptor's builder method #expressionLanguageSupported(boolean) to #expressionLanguageSupported(boolean, ELScope) or similar would provide sufficient control.  The auto generated documentation could use this to provide the associated indication of EL level.
> We could additionally have the test framework make use of this Scope to ensure that if something is/is not scoped to use FlowFile level EL that these are caught in testing.
>  



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