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Posted to dev@avro.apache.org by "ASF subversion and git services (JIRA)" <ji...@apache.org> on 2019/03/31 16:54:00 UTC
[jira] [Commented] (AVRO-2357) (ReflectData) Support for generic
types in protocol definitions
[ https://issues.apache.org/jira/browse/AVRO-2357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16806198#comment-16806198 ]
ASF subversion and git services commented on AVRO-2357:
-------------------------------------------------------
Commit de48a0a8a0343b61fdb255011fde38c619761046 in avro's branch refs/heads/master from ivangreene
[ https://gitbox.apache.org/repos/asf?p=avro.git;h=de48a0a ]
AVRO-2357: Allow generic types in reflect protos (#490)
Adds support for generic types in ReflectData for
Protocols.
> (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
>
> 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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