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From "John Ross (JIRA)" <>
Subject [jira] [Created] (ARIES-1089) Handlers map in NamespaceHandlerSetImpl is unsafe.
Date Thu, 11 Jul 2013 20:25:48 GMT
John Ross created ARIES-1089:

             Summary: Handlers map in NamespaceHandlerSetImpl is unsafe.
                 Key: ARIES-1089
             Project: Aries
          Issue Type: Bug
          Components: Blueprint
            Reporter: John Ross

The NamespaceHandlerSetImpl class uses an unprotected map to store handlers. The map is accessible
to multiple threads. For example, the thread delivering the NamespaceHandler service registration
event will store the handler in the map and eventually call BlueprintContainerImpl.schedule,
which spawns off another thread that will look for a handler in the map.

We appear to be encountering a visibility issue where the org.apache.aries.application.resolver.obr
bundle will never activate because blueprint thinks the required namespace handler is not
available. However, the logs clearly show the namespace handler being registered anywhere
from a millisecond to one or two seconds previously.

Would there be any objections to using a ConcurrentHashMap?

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