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From "Philip Zeyliger (JIRA)" <j...@apache.org>
Subject [jira] Updated: (AVRO-648) Use a template library for the SpecificCompiler
Date Wed, 01 Sep 2010 08:24:54 GMT

     [ https://issues.apache.org/jira/browse/AVRO-648?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Philip Zeyliger updated AVRO-648:
---------------------------------

    Attachment: AVRO-648.patch.txt

Here's a preliminary patch.  I'd still like to diff the generated directory from the tests
against a version without this patch, and I know that I haven't added license headers to the
templates, and probably to the new tests.

> Use a template library for the SpecificCompiler
> -----------------------------------------------
>
>                 Key: AVRO-648
>                 URL: https://issues.apache.org/jira/browse/AVRO-648
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>            Reporter: Philip Zeyliger
>            Assignee: Philip Zeyliger
>         Attachments: AVRO-648.patch.txt
>
>
> This JIRA proposes uses a templating library instead of string concatenation for the
SpecificCompiler.
> We've had conversations on the list about customizing the generated code (by adding getters
and setters, adding utility classes for the arrays, adding String-friendly (as opposed to
Utf8) accessors, etc.), but we've been stymied by the fact that the specific compiler is hard-coded
to use one template, and it's hard to experiment with.   Sam Pullara (at http://github.com/spullara/avrocompiler)
has done pretty much this: he forked/subclassed a copy of SpecificCompiler that uses the Mustache
language to generate code.  He's also gone ahead and done some of the customizations.
> In the patch I'm about to post, I've replicated the existing code generation using Velocity.
 We already build Velocity for some of the IPC plugins, and it's an Apache project.  The existing
tests pass, plus I've added tests that check that the generated code is character-for-character
the same, in a handful of cases.  This was actually quite painful, since I had to reproduce
some questionable indentation and trailing whitespace :).  That said, I'm pleased with how
easy it was to incorporate the templates.
> Eventually, I hope we support getters and setters, or perhaps support multiple versions
of templates.  (If someone wants to generate, say, C++ code, the path is now a lot easier
for that, as well.)

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