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Posted to oak-issues@jackrabbit.apache.org by "Michael Dürig (JIRA)" <ji...@apache.org> on 2013/12/16 12:04:08 UTC

[jira] [Created] (OAK-1290) ObservationManager#removeEventListener prone to deadlocks

Michael Dürig created OAK-1290:
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             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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