| 摘要 |
<P>PROBLEM TO BE SOLVED: To properly perform failure recovery in an electronic money system where online terminals and offline terminals coexist. <P>SOLUTION: For both an electronic money card and a center server, a flag selectable between two values, "transaction in progress" and "transaction completed", is prepared. In the course of processing information between the electronic money card and the center server, the processing is caused to progress while setting their flags on (inverting them from "transaction completed" to "transaction in progress"), or setting them off (resetting them from "transaction in progress" to "transaction completed") in a synchronized manner. If any failure occurs during the processing, the state of the flag when occurrence of the failure is saved in both of them, and therefore based on these states, it is possible to specify the time when the failure has occurred. <P>COPYRIGHT: (C)2011,JPO&INPIT |
