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Posted to issues@nifi.apache.org by "Koji Kawamura (JIRA)" <ji...@apache.org> on 2016/07/31 08:24:20 UTC

[jira] [Commented] (NIFI-2442) Support Expression Language evaluation at onPropertyModified

    [ https://issues.apache.org/jira/browse/NIFI-2442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15401049#comment-15401049 ] 

Koji Kawamura commented on NIFI-2442:
-------------------------------------

Without this, NIFI-2078 can't fully support EL.

> Support Expression Language evaluation at onPropertyModified
> ------------------------------------------------------------
>
>                 Key: NIFI-2442
>                 URL: https://issues.apache.org/jira/browse/NIFI-2442
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Koji Kawamura
>
> Some components have to eagerly get property value change, and do some stuff. Sometimes, the target properties support Expression Language (EL).
> However, since current onPropertyModified method only passes String representation of property value, we can't evaluate EL in that method directly.
> It would be useful if we can use subject-less EL functions (i.e without incoming FlowFile) at onPropertyModified, especially with Variable Registry.



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