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https://issues.apache.org/jira/browse/WSCOMMONS-279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rich Scheuerle resolved WSCOMMONS-279.
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Resolution: Fixed
Committed Revision 595335
> Performance: Avoid overuse of XMLStreamWriter.getNamespaceContext()
> -------------------------------------------------------------------
>
> Key: WSCOMMONS-279
> URL: https://issues.apache.org/jira/browse/WSCOMMONS-279
> Project: WS-Commons
> Issue Type: Bug
> Components: AXIOM
> Reporter: Rich Scheuerle
> Assignee: Rich Scheuerle
>
> History:
> An XMLStreamWriter is used to serialize Axiom trees. The NamespaceContext of
> the XMLStreamWriter is queried to determine if a {prefix, namespace} pair is
> associated.
> If not,"setPrefix(..)" or "setDefaultNamespace(...)" is invoked, which will
> cause the writer to write a namespace declaration.
> This code is complicated by the determination of whether setPrefix occurs
> before or after the start tag.
> Problem:
> Calling getNamespaceContext() is expensive. Some XMLStreamWriter
> implementations construct new NamespaceContext objects. Creating and garbage
> collection of these objects can cause performance degradations.
> Solution:
> I wrote an isAssociated(String prefix, String namespace) method in
> OMSerializerUtil. This method has a two stage "association" check. First it
> uses the writer.getPrefix(uri) call. If this check fails, it falls back to
> the getNamespaceContext() check. This two stage approach avoids unnecessary
> NamespaceContext construction. It is also a convenient utility for
> debugging/support.
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