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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-695) Cycle Reference Support
Date Wed, 03 Feb 2016 19:18:40 GMT

     [ https://issues.apache.org/jira/browse/AVRO-695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ryan Blue updated AVRO-695:
---------------------------
       Resolution: Fixed
         Assignee: Ryan Blue
    Fix Version/s: 1.8.0
           Status: Resolved  (was: Patch Available)

Closing this since it is available using logical types and is used as a [test case|https://github.com/apache/avro/blob/trunk/lang/java/avro/src/test/java/org/apache/avro/TestCircularReferences.java].

> 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
>            Assignee: Ryan Blue
>             Fix For: 1.8.0
>
>         Attachments: AVRO-695.patch, AVRO-695.patch, PERF_8000_cycles.zip, avro-1.4.1-cycle.patch.gz,
avro-1.4.1-cycle.patch.gz, avro_circular_references.zip, avro_circular_refs6.patch, avro_circular_refs7.patch,
avro_circular_refs_2014_06_14.zip, circular_refs_and_nonstring_map_keys_2014_06_25.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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