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https://issues.apache.org/jira/browse/DERBY-2884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12509316
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Knut Anders Hatlen commented on DERBY-2884:
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Currently, ContextManager.getContextStack() is only called on the statement
stack, so creating one for the language connection stack too would waste a
couple of bytes per connection. That shouldn't be much of a problem unless
you're really tight on memory, though, so I don't mind changing it if you'd
prefer that approach.
> 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
>
>
> 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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