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From "Jed Wesley-Smith (JIRA)" <j...@apache.org>
Subject [jira] Created: (FELIX-1746) Reduce contention on ServiceRegistry.getServiceReferences(String, Filter)
Date Tue, 13 Oct 2009 01:37:31 GMT
Reduce contention on ServiceRegistry.getServiceReferences(String, Filter)

                 Key: FELIX-1746
                 URL: https://issues.apache.org/jira/browse/FELIX-1746
             Project: Felix
          Issue Type: Improvement
          Components: Framework
    Affects Versions: felix-2.0.0
            Reporter: Jed Wesley-Smith

Performance testing has shown that there is significant contention on the ServiceRegistry
object's monitor during startup. This is caused by Spring DM making lots of calls to the synchronized
method ServiceRegistry.getServiceReferences(String, Filter). This method is synchronized in
order to protect the m_serviceRegsMap HashMap, but the method does a lot more work than simply
accessing the map.

Propose changing the ServiceRegistry to use a thread-safe Map implementation that does not
require external synchronization, in particular a CopyOnWriteMap. I will add a patch that
includes a CopyOnWriteMap implementation.

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