[jira] [Resolved] (BEAM-2174) Allow coder factories to create Coders for a wider range of types

["Luke Cwik (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-2174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Luke Cwik resolved BEAM-2174.
-----------------------------
    Resolution: Fixed

> Allow coder factories to create Coders for a wider range of types
> -----------------------------------------------------------------
>
>                 Key: BEAM-2174
>                 URL: https://issues.apache.org/jira/browse/BEAM-2174
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Luke Cwik
>            Assignee: Luke Cwik
>             Fix For: First stable release
>
>
> By allowing the CoderFactory to see they type it can look at annotations on the type allowing:
> * @DefaultCoder to become a CoderFactory
> * Creating a ProtoCoderFactory which delegates to the ProtoCoder for all Message types
> * Creating a SerializableCoderFactory which delegates to the SerializableCoder for all Serializable types
> * Creating a WritableCoderFactory which delegates to the Hadoop WritableCoder for all Hadoop Writable types
> This requires plumbing through TypeDescriptor as the primary method of looking up coders within the CoderRegistry
> This also removes the concept of fallback coder providers since every coder factory is treated as a fallback.



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