System and method for restoring a status of an apparatus controlled by multiple commands

A system for restoring a status of an apparatus controlled by multiple commands, the system comprising:

• a first apparatus;
• a second apparatus connected to the first apparatus;
• and
• a third apparatus connected to the second apparatus, wherein
• the first apparatus includes:
• a first memory configured to store first apparatus-status information indicating a status of the third apparatus that is updated by the first apparatus,
• a first processor coupled to the first memory, configured to:
• provide the second apparatus with a first control command for controlling the third apparatus, and
• update the apparatus-status information stored in the first memory when information indicating a normal finish of the first control command is received from the second apparatus;
• the second apparatus includes a second processor configured to:
• convert the first control command received from the first apparatus to a plurality of second control commands compatible with the third apparatus,
• provide the third apparatus with a request to perform the plurality of second control commands, and
• transmit information indicating a normal finish of the first control command to the first apparatus when all of the plurality of second control commands finish normally;
• and
• the third apparatus includes:
• a second memory configured to store second apparatus-status information indicating a status of the third apparatus that is updated by the third apparatus, and a reverse command for restoring a result of executing each second control command to a result prior to executing the each second control command,
• a third processor coupled to the second memory, configured to:
• execute the plurality of second control commands, based on a request from the second apparatus, and update the second apparatus-status information in connection with finish of each second control command,
• transmit a normal-finish notification indicating a normal finish of the plurality of second control commands to the second apparatus,
• generate a reverse command in connection with execution of each second control command, and store the generated reverse commands in the second memory, and
• in a case where all of the plurality of second control commands have not been executed, cause the second apparatus-status information to be restored to information indicating a status prior to execution of the plurality of second control commands by executing control based on the reverse commands stored in the second memory.