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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5947) Factor out common code from generated classes
Date Tue, 16 Oct 2012 17:49:04 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5947?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477208#comment-13477208
] 

Dag H. Wanvik commented on DERBY-5947:
--------------------------------------

This looks like good changes to me. Nice to be able to lift that shared code up into BaseActivation.
The less logic there remains in the generated code, the better. Good to tweak away superfluous
bytes in the generated code, too, should help the JIT :) +1

                
> Factor out common code from generated classes
> ---------------------------------------------
>
>                 Key: DERBY-5947
>                 URL: https://issues.apache.org/jira/browse/DERBY-5947
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: d5947-1a-remove-common-methods.diff, d5947-2a-execute-method.diff,
natural-join-decompiled.txt, values1-after-1a.txt, values1-after-2a.txt, values1-decompiled.txt
>
>
> There's some code that's added to all classes generated by Derby's query compiler. For
example, there are three static fields that contain statistics used to check if the plan is
stale, and there are getter and setter methods for each of the three fields. The fields and
their accessor methods take up 468 bytes in every generated class.
> We should see if we can factor out some of this code so that there is a single shared
copy in BaseActivation. Advantages would be: less complicated byte-code generation, less memory
occupied by generated classes in the statement cache, smaller disk footprint for stored prepared
statements.

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