SERVER APPARATUS AND COMMUNICATION SYSTEM

• US 20090228547A1
• Filed: 02/26/2009
• Published: 09/10/2009
• Est. Priority Date: 03/04/2008
• Status: Active Grant

• Current Assignee: KDDI Corporation
• Original Assignee: KDDI Corporation
• Inventors: Miyaoka, Shinya, Fukuoka, Hiroyuki
• Granted Patent: US 8,239,525 B2
• Time in Patent Office: Days
• US Class Current: 709/203
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes

Abstract

A client apparatus requests a server apparatus to transmit information. The server apparatus receives the request from the client apparatus, and determines whether a state of an information source satisfies a predetermined condition. The server apparatus, as a result of the determination, if the state of the information source does not satisfy the predetermined condition, suspends a response to the client apparatus, while, if the state of the information source satisfies the predetermined condition, acquires information corresponding to the request from the information source as a response to the client apparatus, and transmits the acquired information to the client apparatus.

Claims

1. A server apparatus which acquires information from an information source in response to a request received from a client apparatus and transmits the acquired information to said client apparatus, comprising:

a reception section for receiving a request from said client apparatus;

a determination section for determining whether a state of said information source satisfies a predetermined condition; and

a transmission section which, if, as a result of said determination, the state of said information source does not satisfy the predetermined condition, suspends a response to said client apparatus, while, if the state of said information source satisfies the predetermined condition, acquires information corresponding to said request from said information source as a response to said client apparatus, and transmits the acquired information to said client apparatus.

2. The server apparatus according to claim 1, wherein

said determination section determines whether information of said information source is updated;

and said transmission section, if, as a result of said determination, information of said information source is not updated, suspends a response to said client apparatus, while, if the state of said information source is updated, acquires information corresponding to said request from said information source as a response to said client apparatus, and transmits the acquired information to said client apparatus.

3. The server apparatus according to claim 2, wherein

said transmission section, when, as a result of said determination, information of said information source is not updated, suspends a response to said client apparatus until a predetermined time elapses, and, when the predetermined time elapses, transmits information indicating that the information corresponding to said request is not updated to said client apparatus as a response to said client apparatus.

4. A communication system including a server apparatus and a client apparatus;

said server apparatus acquires information from an information source in response to a request received from said client apparatus, and transmits the acquired information to said client apparatus,

said client apparatus requesting said server apparatus to transmit information; and

said server apparatus receiving the request from said client apparatus to determine whether a state of said information source satisfies a predetermined condition, and, as a result of said determination, if the state of said information source does not satisfy the predetermined condition, suspending a response to said client apparatus, while, if the state of said information source satisfies the predetermined condition, acquiring information corresponding to said request from said information source as a response to said client apparatus and transmitting the acquired information to said client apparatus.

5. The communication system according to claim 4, wherein

said server apparatus determines whether the information of said information source is updated, and, as a result of said determination, if the information of said information source is not updated, suspends a response to said client apparatus, while, if the information of said information source is updated, acquires information corresponding to said request from said information source as a response to said client apparatus and transmits the acquired information to said client apparatus.

6. The communication system according to claim 5, wherein

said server apparatus, as a result of said determination, if the information of said information source is not updated, suspends a response to said client apparatus until a predetermined time elapses, and, if the predetermined time elapses, transmits information indicating that the information corresponding to said request is not updated, to said client apparatus as a response to said client apparatus;

while,

said client apparatus, after transmitting said request, suspends transmission of a request until a predetermined time elapses, and, when the predetermined time elapses, transmits a request again.