Joseph Witt updated NIFI-2442:
    Fix Version/s:     (was: 1.1.0)

> ExternalStateManager should support Expression Language evaluation
> ------------------------------------------------------------------
>                 Key: NIFI-2442
>                 URL: https://issues.apache.org/jira/browse/NIFI-2442
>             Project: Apache NiFi
>          Issue Type: Sub-task
>          Components: Core Framework
>    Affects Versions: 1.0.0
>            Reporter: Koji Kawamura
>            Assignee: 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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