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Two-phase commit synchronizing seal state

  • US 7,358,856 B2
  • Filed: 03/17/2005
  • Issued: 04/15/2008
  • Est. Priority Date: 03/18/2004
  • Status: Active Grant
First Claim
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1. A method of two-phase transaction commit processing in a conveyance tracking system using a reader device for synchronizing seal state information between a seal device attached to a conveyance and a host for tracking conveyances, the method executed by the seal device, the method comprising:

  • in response to receiving a prepare operation message from the reader device, entering a prepared state for a seal operation;

    communicating seal device preparation status via the reader device to the host, causing the host to execute the seal operation;

    in response to receiving a seal operation execution message from the host via the reader device, fulfilling the seal operation and storing associated seal state information.

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