[jira] [Assigned] (BEAM-1936) Allow user provided function to extract custom timestamp from payload in pubsubIO

["Daniel Halperin (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-1936?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Halperin reassigned BEAM-1936:
-------------------------------------

    Assignee:     (was: Daniel Halperin)

> Allow user provided function to extract custom timestamp from payload in pubsubIO
> ---------------------------------------------------------------------------------
>
>                 Key: BEAM-1936
>                 URL: https://issues.apache.org/jira/browse/BEAM-1936
>             Project: Beam
>          Issue Type: New Feature
>          Components: sdk-java-gcp
>            Reporter: Keith Berkoben
>
> Currently the PubsubIO runner only allows the caller to set a custom timestamp if the timestamp is defined in the attributes of the message.  This can be problematic when the user does not control the publisher.  In such a case, proper windowing of data requires the timestamp to be pulled out of the message payload.  
> Since a payload could have arbitrary data, the user would have to provide a Function<T, String>() that would extract the timestamp from the payload:
> PubsubIo.Read.timestampLabel(Function<T, String> extractor);



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