[jira] [Commented] (BEAM-2051) Reduce scope of the PCollectionView interface

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-2051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991795#comment-15991795 ] 

ASF GitHub Bot commented on BEAM-2051:
--------------------------------------

GitHub user tgroh opened a pull request:

    https://github.com/apache/beam/pull/2811

    [BEAM-2051] Cast to SimplePCollectionView instead of View.

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    ---
    Wherever a View method is used, a concrete instance of
    SimplePCollectionView is required.
    
    PCollectionView is a marker interface. Runners can expect to
    always recieve a subclass of SimplePCollectionView, and cast to it when
    methods are required.
    
    Once this is live in the DataflowRunner, #2680 can be merged. This is #2680, without the changes to PCollectionView

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/tgroh/beam view_as_marker_prereq

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/beam/pull/2811.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2811
    
----
commit c60d4a3ec4f07110a0a5d4c307bbbf9e5f4db416
Author: Thomas Groh <tg...@google.com>
Date:   2017-04-21T16:46:28Z

    Cast to SimplePCollectionView instead of View.
    
    Wherever a View method is used, a concrete instance of
    SimplePCollectionView is required.
    
    PCollectionView is a marker interface. Runners can expect to
    always recieve a subclass of SimplePCollectionView, and cast to it when
    methods are required.

----


> Reduce scope of the PCollectionView interface
> ---------------------------------------------
>
>                 Key: BEAM-2051
>                 URL: https://issues.apache.org/jira/browse/BEAM-2051
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Thomas Groh
>            Assignee: Thomas Groh
>             Fix For: First stable release
>
>
> Users should only ever use a PCollectionView class as a token to access a view. A Runner can cast down to a more expressive type if required.



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