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https://issues.apache.org/jira/browse/AVRO-695?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sachin Goyal updated AVRO-695:
------------------------------
Attachment: avro_circular_refs6.patch
avro_circular_refs6.patch is created using
{code}
lang/java/avro% svn diff src/
{code}
It eliminates the need to add an extra field per record and relies on the order
of record-writing and reading.
In this patch, there is an equals check at 3 places of the form:
{code}
schema.getFullName().equals(CircularRef.class.getName())
{code}
I think this could be improved by adding a boolean-property in the schema for
CircularRef or somehow comparing the class.
Comments are welcome.
> 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, avro_circular_refs6.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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