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From "Dyre Tjeldvoll (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-938) ContextManager needs to be optimized
Date Mon, 20 Feb 2006 11:44:28 GMT
    [ http://issues.apache.org/jira/browse/DERBY-938?page=comments#action_12367023 ] 

Dyre Tjeldvoll commented on DERBY-938:
--------------------------------------

Thanks for your feedback.

- I'll fix the javadoc issues.

- I'll trust you on the "package protected" access issue, and fix that.

- About List and unmodifiableList: From a SW engineering point of view, I totally agree. However,
my profiler indicates that this uses about 3 times more CPU. It's a tradeoff...

- Yes, voidArrayList_ should have been static.

- No the intention was that the List cannot be modified while it is traversed. I must admit
that I don't understand why you would want to allow that (given that MT-access is ruled out).
If you require the use of polymorphism to determine which elements should be removed from
the container, would it not be better to mark those elements so that they get deleted when
the iteration reaches their location in the container?

- Yes, I will add a comment about how the elements are ordered in the returned List.
 

> ContextManager needs to be optimized
> ------------------------------------
>
>          Key: DERBY-938
>          URL: http://issues.apache.org/jira/browse/DERBY-938
>      Project: Derby
>         Type: Improvement
>   Components: Performance
>     Reporter: Dyre Tjeldvoll
>     Assignee: Dyre Tjeldvoll
>     Priority: Minor
>  Attachments: derby-938.diff, derby-938.html, derby-938.v2.diff, derby-938.v2.stat, derbyall_report.v2.txt,
get.html, get.v2.html
>
> ContextManagers are used extensively, particularly to get access to ExcutionContexts
and StatementContexts. Optimizing this access should improve overall performance. 

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