[jira] [Resolved] (AVRO-2357) (ReflectData) Support for generic types in protocol definitions

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

     [ https://issues.apache.org/jira/browse/AVRO-2357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Kulp resolved AVRO-2357.
-------------------------------
    Resolution: Fixed

> (ReflectData) Support for generic types in protocol definitions
> ---------------------------------------------------------------
>
>                 Key: AVRO-2357
>                 URL: https://issues.apache.org/jira/browse/AVRO-2357
>             Project: Apache Avro
>          Issue Type: Improvement
>          Components: java
>            Reporter: Ivan Greene
>            Priority: Minor
>             Fix For: 1.9.0
>
>
> For a Java interface extending another interface with type parameters, we may resolve actual type parameters and build the protocol definition based upon those.
> For example, let's say we have a generic protocol defined by a Java interface:
> {code:java}
> public interface CrudProto<T, I> {
>   void persist(T record);
>   T fetchById(I id);
> }{code}
> It would be natural to define a set of interfaces that extend this, such as:
> {code:java}
> public interface FooBarRecordProto extends CrudProto<FooBarRecord, String> {}
> public interface OtherRecordProto extends CrudProto<OtherRecord, Long> {}
> {code}
> Calling ReflectData.get().getProtocol(FooBarRecordProto.class) should be able to resolve that this protocol deals in FooBarRecords and Strings, and build a protocol accordingly.
> Currently, this call will produce an exception stating that a schema for 'T' cannot be resolved.



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