[jboss-jira] [JBoss JIRA] Created: (BPEL-309) Performance improvement: use a HashMap in SetNamespaceContext instead of iterating through all namespaces

Fri Oct 9 11:10:07 EDT 2009

Performance improvement: use a HashMap in SetNamespaceContext instead of iterating through all namespaces
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                 Key: BPEL-309
                 URL: https://jira.jboss.org/jira/browse/BPEL-309
             Project: jBPM BPEL
          Issue Type: Patch
      Security Level: Public (Everyone can see)
          Components: Engine
    Affects Versions: jBPM BPEL 1.1.1
            Reporter: Aleksander Adamowski
            Assignee: Alejandro Guizar

During profiling of an application based on jBPM-BPEL, we've discovered that the dominating method which has the largest inherent CPU time is org.jbpm.bpel.sublang.xpath.SetNamespaceContext.translateNamespacePrefixToUri, being invoked over 70000 times for a single business process execution, and consuming unreasonably large amounts of CPU time do this amount of invocations when compared to other methods.

After closer inspection, it turned out that the method simply iterates over the set of all known namespaces when looking for an URI.

This seriously impacts jBPM-BPEL performance.

Adding a simple HashMap allows performing the lookup much faster and eliminates the biggest CPU hog in jBPM-BPEL for us.

Attaching the trivial patch.

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