Method and apparatus for communication between at least one client and at least one server

• US 5,699,523 A
• Filed: 06/05/1996
• Issued: 12/16/1997
• Est. Priority Date: 03/12/1993
• Status: Expired due to Fees

• Current Assignee: Bull Sas (Atos SE)
• Original Assignee: Bull Sas (Atos SE)
• Inventors: Li, Jianzhong, Brunon, Jean-Philippe
• Primary Examiner(s): Geckil, Mehmet B.
• Application Number:
  US08/658,308
• Time in Patent Office: 559 Days
• Field of Search: 395/200.15, 395/200.19, 395/650
• US Class Current: 709/238
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A device for communication between at least one client and at least one server who are exchanging messages, characterized in that it includes a router which routes the messages between at least one client and at least one server with the aid of three message queues, including a first queue assigned to the router assuring the storage of the messages from clients or servers; a second queue assigned to the server enabling the reading of messages of requests formulated to the server; a third queue assigned to the client enabling the reading of response messages.

Claims

1. A device for communication between at least one client and at least one server which are exchanging messages, comprising a router (360), means connecting the router to said at least one client and said at least one server for routing messages between said at least one client (361, 2) and said at least one server (381, 382, 35) with the aid of three message queues, said three message queues including:

a first queue (3601) stored in the router (360) for enabling storage of messages received from said at least one client or said at least one server;

a second queue (381) stored in said at least one server for enabling reading of messages including requests directed to said at least one server (38,

     35);

a third queue (392) stored in said at least one client (39) for enabling reading response messages from said at least one server, each of said messages including a field indicating whether a query or response is involved,

the router (360) including means for generating a message identifier for said at least one server (38,

     35) and said at least one client (39), and

means for writing at the connection with the router a field in the message (Session Id) identifying the client session, and means for writing in other fields of the message (SRV Session Id) information identifying the server session at the connection of a server with the router.

2. The device of claim 1, wherein the client includes means for generating a message identifier for the router.

3. The device of claim 1, wherein said at least one server (38, 35) includes means for generating a message identifier for the router (360).

4. The device of claim 1, wherein each of said messages includes a priority field indicating a degree of priority of said query.

5. The device of claim 1, wherein each of said messages includes a priority field indicating a degree of priority of said query.

6. The device of claim 5, wherein each of said messages includes a status field indicating a status of said message via a return code.

7. The device of claim 1, wherein each of said messages includes a status field indicating a status of said message via a return code.

8. A device for communication between at least one client and at least one server which are exchanging messages, comprising a router (360), means connecting the router to said at least one client and said at leash one server for routing message between said at least one client (361, 2) and said at least one server (381, 382, 35) with the aid of three message queues, said three message queues including:

a first queue (3601) stored in the router (360) for enabling storage of messages received from said at least one client or said at least one server;

a second queue (381) stored in said at least one server for enabling reading of messages including requests directed to said at least one server (38,

     35);

a third queue (392) stored in said at least one client (39) for enabling reading response messages from said at least one server, each of said messages including a field indicating whether a query or response is involved and

the router (360) including means for generating a message identifier for said at least one server (38,

     35) and said at least one client (30-39).

9. The device of claims 8, wherein said at least one server (38, 35) includes means for generating a message identifier for the router (360).

10. The device of claims 8, wherein said at least one server (38, 35) includes means for generating a message identifier for the router (360).

11. The device of claim 8, wherein the message includes a first field of two eight-bit bytes indicating whether communication is synchronous or asynchronous and a second field of two eight-bit bytes to indicate whether the message is a response or a request, by assigning said second field a value 0 or a value other than 0, respectively.

12. The device of claim 11, wherein the message includes a third field of four eight-bit bytes identifying a user who sent the message.

13. The device of claim 11, wherein the message includes a field of four eight-bit bytes identifying an addressee of the message.

14. A method for processing synchronous requests between a client and a server in communication through a router, said method including the steps of:

sending a message by the client to a first queue (3601) of the router;

determining by the router whether the message is a request or a reply;

sending a message by the router with an identifier to a second queue (351,

     381) assigned to the server;

sending an acknowledgement message to the client with an identifier after receiving a response in the first queue of the router and enabling the client to retrieve a response from the first queue (3601) of the router.

15. The method of claim 14, wherein the client is itself a server.

16. The method of claim 14, wherein the server is a client of a different server in a synchronous or asynchronous mode.

17. The method of claim 14, wherein each message includes a field of two eight-bit bytes indicating whether the communication is synchronous and a field of two eight-bit bytes to indicate whether the message is a response or a request.

18. The method of claim 14, wherein each message includes a field of four eight-bit bytes identifying a sender of the message.

19. The method of claim 14, wherein each message includes a field of four eight-bit bytes identifying an addressee of the message.

20. A method for processing asynchronous requests between a client and a server in communication through a router, said method including the following steps:

sending a request message by the client to a first queue (3601) of the router with a first identifier;

sending a request message by the router with a second identifier to a second queue (351,

     381) of the server (35,

     38), acknowledging by the router to the client reception of the request message, and acknowledging by the server reception to the router by sending the second identifier to the first queue (3601) of the router (360); and

sending a message by the server with the second identifier to the first queue (3601) of the router once the server has prepared a response, the message including a field to indicate whether the message is a response or a request.

21. The method of claim 20, further including the steps of sending a message by the router to the second queue (351) of the server (35), sending a first acknowledgement from the server to the router (360) and sending a second acknowledgement from the router to the server (381).

22. The method of claim 20, further including the steps of retrieving a response by the client by sending a request message (fetch-message) to the first queue (3601) of the router, transmitting by the router said message to the second queue of the server (35), sending a response by the server to the first queue of the router and retransmitting by the router the response to the client.

23. The method of claim 20, further including the steps of sending by the client a message to the first queue (3601) of the router (360), and comparing by the router a value of the message identifier with the value "-1", in order to either calculate a new message identifier if the value is "-1", or to retransmit the message identifier received to the client if the value is other than "-1".

24. The method of claim 20, wherein the message includes a field of two eight-bit bytes indicating whether the communication is synchronous or asynchronous and a field of two eight-bit bytes to indicate whether the message is a response or a request.

25. The method of claim 24, wherein the message includes a field of four eight-bit bytes for identification of a sender of the message.

26. The method of claim 24, wherein the message includes a field of four eight-bit bytes for identification of an addressee of the message.