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From Michael Dürig (JIRA) <j...@apache.org>
Subject [jira] [Assigned] (OAK-1290) ObservationManager#removeEventListener prone to deadlocks
Date Mon, 16 Dec 2013 11:06:10 GMT

     [ https://issues.apache.org/jira/browse/OAK-1290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael Dürig reassigned OAK-1290:
----------------------------------

    Assignee: Michael Dürig

> 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
>            Assignee: 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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