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From "Moustapha Cherri (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AVRO-695) Cycle Reference Support
Date Sun, 09 Jan 2011 20:34:46 GMT

    [ https://issues.apache.org/jira/browse/AVRO-695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12979402#action_12979402
] 

Moustapha Cherri commented on AVRO-695:
---------------------------------------

Dear Doug,

Thanks for your valuable comments. I agree with you. I will implement them soon. I will build
a wrapper around GenericDatumReader and GenericDatumWriter so that applications can inject
this aspect as needed. Wrapping will allow application using for example ReflectDatumReader/
ReflectDatumWriter to use this feature without implementing a new special class for them.

Best regards,
Moustapha Cherri

> Cycle Reference Support
> -----------------------
>
>                 Key: AVRO-695
>                 URL: https://issues.apache.org/jira/browse/AVRO-695
>             Project: Avro
>          Issue Type: New Feature
>          Components: spec
>    Affects Versions: 1.4.1
>            Reporter: Moustapha Cherri
>             Fix For: 1.5.0
>
>         Attachments: avro-1.4.1-cycle.patch.gz, avro-1.4.1-cycle.patch.gz
>
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
> This is a proposed implementation to add cycle reference support to Avro. It basically
introduce a new type named Cycle. Cycles contains a string representing the path to the other
reference.
> For example if we have an object of type Message that have a member named previous with
type Message too. If we have have this hierarchy:
> message
>   previous : message2
> message2
>   previous : message2
> When serializing the cycle path for "message2.previous" will be "previous".
> The implementation depend on ANTLR to evaluate those cycle at read time to resolve them.
I used ANTLR 3.2. This dependency is not mandated; I just used ANTLR to speed thing up. I
kept in this implementation the generated code from ANTLR though this should not be the case
as this should be generated during the build. I only updated the Java code.
> I did not make full unit testing but you can find "avrotest.Main" class that can be used
a preliminary test.
> Please do not hesitate to contact me for further clarification if this seems interresting.
> Best regards,
> Moustapha Cherri

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