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Posted to dev@avro.apache.org by "Sachin Goyal (JIRA)" <ji...@apache.org> on 2014/06/13 00:19:02 UTC
[jira] [Commented] (AVRO-695) Cycle Reference Support
[ https://issues.apache.org/jira/browse/AVRO-695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14029922#comment-14029922 ]
Sachin Goyal commented on AVRO-695:
-----------------------------------
For designs with no circular reference, the above options need not be used and those clients would not be affected thus.
> 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: 1.7.6
> Reporter: Moustapha Cherri
> Attachments: avro-1.4.1-cycle.patch.gz, avro-1.4.1-cycle.patch.gz, avro_circular_references.zip
>
> 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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