Hitachi, Ltd.

Shigeki Kawano

Katsumi Kawano

Kinji Mori

Motohisa Funabashi

Masayuki Orimo

Shigeki Hirasawa

Hiroshi Wataya

Masanori Kataoka

Junichi Toyouchi

Tamio Iizuka

Linda Strick

A client (referred to as A) transmits a request to a service mediate server (referred to as B) through a communication medium. B receives information. A server (referred to as C) receives a request for obtaining information from B and transmits information requested by B. B receives a request from A. A service mediate managing unit determines a type of information to be provided to A, based on the attribute information of the content of the request, the customized information of A and C pre-stored in the service mediate managing unit, and various status at the receipt of the request. The service mediate agent selects any one of plural Cs and transmit the request for obtaining information to the selected C. The information received by C is processed by the service mediate agent and the processed information is transmitted to A.

Method and apparatus for controlling server

A network system includes at least one computer which includes a processor for processing data and attaching an associated contents code corresponding to the processed data and data group information indicative of a data group corresponding to the attributes of the processed data to ask a data transmission request and a transmission controller connected to the processor for controllably transmitting a frame including the transmission sub-network, the contents code and the processed data to the first sub-network according to the data group information of the processed data. A second computer connected judges whether or not the contents code of the frame received from the first sub-network conforms to one of a plurality of data reception enable/disable judgement conditions. A third computer judges whether or not the contents code of the frame received conforms to one of a plurality of data reception enable/disable judgement conditions, and storing the received frame having the contents code conforming to one of the plurality of data reception enable/disable judgement conditions. The second computer includes a filter in which the contents codes differently set for respective sub-networks are stored and which changes the contents code contained in the received frame to the contents code set for the receiving sub-network.

Apparatus for filtering multicast messages transmitted between

In an information processing system having plural processing units connected through a communication medium, each processing unit operates to receive information to be transmitted from a processing portion operating in the processing unit to the communication medium and a content code predetermined according to the content of the information to be transmitted. Based on the received content code, the processing unit operates to determine an address of the destination processing unit, a sending mode used for transmitting the information, and whether or not the more reliable communication method arranged to establish a connection between the processing units is used for transmitting the information. Then, by using the sending mode and the communication method obtained as the determined result, the information is transmitted to the processing unit having an address obtained as the result determined through the communication medium.

Method of communicating messages in a distributed processing system

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Yokosuka, Japan

Shigeki Kawano