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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2884) CtxStack should only create unmodifiable view once per instance
Date Sat, 30 Jun 2007 16:20:04 GMT
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:
            Reporter: Knut Anders Hatlen
            Assignee: Knut Anders Hatlen
            Priority: Minor

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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