Patent ID: 6243662
Filing Date: 2001-06-05
Classification: G06F

Abstract:
A data relay device relaying data between a data use unit that uses data, and a data supply unit that supplies stored data, said data relay device comprising:a history memory that stores history information of relayed data;a request analysis unit that receives a data acquisition request from said data use unit, analyzes whether said data acquisition request is a data relay request or a history information acquisition request, and extracts a data name from said data acquisition request when said data acquisition request is a data relay request, while extracting a data name, time, and a search method from said data acquisition request when said data acquisition request is a history information acquisition request;a data request unit that, when said data acquisition request is a data relay request, requests data corresponding to the data name extracted by said request analysis unit from the data supply unit and receives data sent from the data supply unit in response to the request; anda history management unit that, when said data acquisition request is a data relay request, associatively stores the data received by said data request unit, the name of the data, and time when data relay processing was performed, in said history memory as history information, and outputs the data received by said data request unit, while, when the data acquisition request is a history information acquisition request, using the data name and time extracted by said request analysis unit to search said history memory for appropriate history information by the search method extracted by said request analysis unit and outputting data contained in the detected history information.