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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Created] (OAK-1290) ObservationManager#removeEventListener prone to deadlocks
Date Mon, 16 Dec 2013 11:04:08 GMT
Michael Dürig created OAK-1290:
----------------------------------

             Summary: ObservationManager#removeEventListener prone to deadlocks 
                 Key: OAK-1290
                 URL: https://issues.apache.org/jira/browse/OAK-1290
             Project: Jackrabbit Oak
          Issue Type: Improvement
          Components: jcr
            Reporter: Michael Dürig


The contract for {{ObservationManager#removeEventListener}} mandates: "A listener may be deregistered
while it is being executed. The deregistration method will block until the listener has completed
executing."

However a strict implementation of this contract is prone to deadlocks: clients unregistering
event listeners need to take care not to hold a lock that is also acquired from the event
listener being unregistered as this will lead to a deadlock




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