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From "Matthew Hayes (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DATAFU-50) ContextualEvalFunc should have good lifecycle hooks
Date Tue, 02 Jan 2018 18:05:00 GMT

     [ https://issues.apache.org/jira/browse/DATAFU-50?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthew Hayes closed DATAFU-50.
-------------------------------

> ContextualEvalFunc should have good lifecycle hooks
> ---------------------------------------------------
>
>                 Key: DATAFU-50
>                 URL: https://issues.apache.org/jira/browse/DATAFU-50
>             Project: DataFu
>          Issue Type: Improvement
>            Reporter: Philip (flip) Kromer
>            Assignee: Philip (flip) Kromer
>              Labels: Utils
>             Fix For: 1.3.3
>
>         Attachments: 0001-DATAFU-50-SimpleEvalFunc-should-extend-ContextualEva.patch,
DATAFU-50-2.patch
>
>
> Being able to squirrel away values frozen at frontend-launch-time is very handy. 
> This does two things:
> * makes SimpleEvalFunc extend ContextualEvalFunc rather than plain-old-EvalFunc. This
seems harmless and gains you all that power of Contextualism.
> * Adds a hook method "void schemaReadyHook(inputSchema,outputSchema)" to ContextualEvalFunc,
called once the schemata are prepared. This acts as sugar for classes that want to set properties
at front-end time to be used at later points but which, like most SimpleEvalFunc's, want nothing
to do with schema calculation. In ContextualEvalFunc it does nothing; subclasses may override
it and if so must call super. schemaReadyHook().



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