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From "Andy Jefferson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JDO-591) Enhancer Invocation API
Date Fri, 21 Nov 2008 09:02:44 GMT

    [ https://issues.apache.org/jira/browse/JDO-591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649628#action_12649628
] 

Andy Jefferson commented on JDO-591:
------------------------------------

Agree with setClassLoader(), use of varargs,  and chaining methods (so all setters return
the JDOEnhancer) from Ilan.

Another usecase that is required is the dynamic construction of classes in memory (in a custom
class loader). These then need enhancing. The user typically has the "byte[]" of the class
and so we need something pertaining to

byte[] enhanceClass(byte[])

taking in the original bytecode and returning the modified bytecode. In this case it wouldn't
be expected to save to disk the enhanced class.

> Enhancer Invocation API
> -----------------------
>
>                 Key: JDO-591
>                 URL: https://issues.apache.org/jira/browse/JDO-591
>             Project: JDO
>          Issue Type: New Feature
>          Components: api2
>            Reporter: Andy Jefferson
>            Assignee: Andy Jefferson
>             Fix For: JDO 2 maintenance release 3
>
>         Attachments: jdoenhancer.patch
>
>
> Having a standard interface to invoke the enhancer makes a lot of sense so we can have
interchangeability of enhancers (for implementations that support BinaryCompatibility). 
> A start point (for discussions) could be
> java -cp classpath  {enhancer-class} [options] [jdo-files] [class-files]
>     where options can be
>         -persistenceUnit persistence-unit-name : Name of a "persistence-unit" to enhance
the classes for
>         -d target-dir-name : Write the enhanced classes to the specified directory
>         -checkonly : Just check the classes for enhancement status
>         -v : verbose output
> This then allows enhancement of the specified classes, or the classes defined by the
specified JDO files, or the classes defined by the specified persistence-unit.
> What other control would people like to see ? 

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