Capturing and re-creating the state of a queue when migrating a session
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United States of America Patent
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Aug 19, 2008
Grant Date -
Mar 16, 2006
app pub date -
May 17, 2005
filing date -
Aug 12, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for migrating the session state of an original session from a first node to a second node, such that a process, executing in the migrated session, may enqueue and dequeue messages from a queue of messages and experience the same behavior from the queue of messages as if the process was enqueuing and dequeuing messages in the original session. Advantageously, all the benefits of migrating a session from one node to another node may be realized, even when the session contains queuing state information that describes the state of a queue of messages. Data that indicates how many messages one or more subscribers have removed from the queue of messages may also be stored to preserve proper behavior of the queue of messages for multiple subscribers when sessions are migrated.
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