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Posted to derby-dev@db.apache.org by "Knut Anders Hatlen (JIRA)" <ji...@apache.org> on 2007/07/01 17:11:04 UTC
[jira] Updated: (DERBY-2884) CtxStack should only create
unmodifiable view once per instance
[ https://issues.apache.org/jira/browse/DERBY-2884?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Knut Anders Hatlen updated DERBY-2884:
--------------------------------------
Attachment: ctxstack2.diff
Attaching new patch which skips the lazy initialization of the read-only view. All tests passed.
> CtxStack should only create unmodifiable view once per instance
> ---------------------------------------------------------------
>
> Key: DERBY-2884
> URL: https://issues.apache.org/jira/browse/DERBY-2884
> Project: Derby
> Issue Type: Improvement
> Components: Performance, Services
> Affects Versions: 10.4.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Priority: Minor
> Attachments: ctxstack.diff, ctxstack2.diff
>
>
> Each time a transaction is committed or aborted, GenericLanguageConnectionContext.resetSavepoints() goes through the stack of statement contexts and invokes resetSavePoint() on them. Instead of traversing the list in the CtxStack object directly, it fetches a read-only view of the list. Since the lifetime of a CtxStack object and the list within it can span multiple transactions, the read-only view only needs to be created the first time CtxStack.getUnmodifiableList() is called on an object.
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