Patent ID: 11968253
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 5:
6. A request delivery method in a publish subscribe system that is performed by a request delivery device including a request storage, a transmitter, a receiver, and a completion list storage, the method comprising:
storing, by the request storage, a request scheduled to be transmitted to a server;
transmitting, by the transmitter, the request read from the request storage to the server capable of processing the request;
receiving, by the receiver, a completion message indicating that processing of the request is completed; and
storing, by the completion list storage, information regarding the completion message,
wherein transmitting the request includes:
based on the request being stored in the completion list storage, discarding the request without transmitting the request to the server, and
based on the request not being stored in the completion list storage, transmitting, to the server, the request and storing the request again in the request storage, and

wherein, based on a completion message of a same request from a second server for a request for which the information regarding the completion message from a first server has already been stored in the completion list storage being received by the receiver, the receiver instructs the second server to roll back the request.