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From "Miguel Cuervo (JIRA)" <>
Subject [jira] Created: (COCOON-2109) Incorrent cleanup of expired continuations
Date Fri, 10 Aug 2007 09:53:42 GMT
Incorrent cleanup of expired continuations

                 Key: COCOON-2109
             Project: Cocoon
          Issue Type: Bug
          Components: - Flowscript
    Affects Versions: 2.1.10, 2.1.9, 2.1.8, 2.1.7, 2.1.6, 2.1.11-dev (Current SVN)
            Reporter: Miguel Cuervo

The class ContinuationsManagerImpl is in charge of cleaning up expired continuations. It does
so in the method expireContinuations. In this method there is a loop using an iterator over
a SortedSet of continuations (WebContinuation). The loop is expecting that the continuations
are ordered from oldest to newest.  The loop stops in the first continuation that is not expired.
The logic is correct since all the newer continuations could not be expired.

However, the problem comes from the ordering of the continuations. To have the continuations
ordered by lastAccessTime the program uses a TreeSet as a container of the continuations.
The continuations correctly implement the compareTo interface using the lastAccessTime and
when a continuation is inserted in the container, it gets correctly ordered. But once the
continuation is inserted in the container, the continuation can change its lastAccessTime
using the method WebContinuation.updateLastAccessTime() called from WebContinuation.getContinuation().
The ordering of the TreeSet is not updated with the change and when the program iterates over
it, it does not get the continuations in the order expected.

The result of this bug is that under hevy load may expired continuations may be around before
the loop actually clean them up, eating memory resources and causing OutOfMemory.

To fix it, a patch is provided using a HashSet for the continuations container and looping
over all the continuations to checked if they have expired.

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