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From "Daniel Halperin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (BEAM-247) CombineFn's only definable/usable inside sdk.transforms package
Date Sat, 25 Jun 2016 17:11:37 GMT

     [ https://issues.apache.org/jira/browse/BEAM-247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Daniel Halperin updated BEAM-247:
---------------------------------
    Fix Version/s: Not applicable

> CombineFn's only definable/usable inside sdk.transforms package
> ---------------------------------------------------------------
>
>                 Key: BEAM-247
>                 URL: https://issues.apache.org/jira/browse/BEAM-247
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Ben Chambers
>            Assignee: Pei He
>            Priority: Critical
>             Fix For: Not applicable
>
>
> {code:java}
> public abstract static class CombineFn<InputT, AccumT, OutputT>
>   extends AbstractGlobalCombineFn<InputT, AccumT, OutputT> { /* ... */ }
> abstract static class AbstractGlobalCombineFn<InputT, AccumT, OutputT>
>   implements GlobalCombineFn<InputT, AccumT, OutputT>, Serializable { /* ... */
}
> {code}
> Since {{AbstractGlobalCombineFn}} is package protected (and therefore not visible outside
of the {{transform}} package, it is not possible to cast any class that extends {{CombineFn}}
to a {{GlobalCombineFn}} outside of this package.
> This prevents applying existing {{CombineFns}} directly (such as {{Combine.perKey(new
Sum.SumIntegersFn())}}, as used in our documentation) and also means that a user cannot define
their own {{CombineFn}} unless they put them in the {{transform}} package.



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