A {@link ThreadPoolExecutor} that maintains the order of {@link IoEvent}s.
If you don't need to maintain the order of events per session, please use {@link UnorderedThreadPoolExecutor}.
@author The Apache MINA Project (dev@mina.apache.org)
@version $Rev: 647673 $, $Date: 2008-04-14 15:47:40 +0900 (Mon, 14 Apr 2008) $
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