Communications system for client-server data processing systems

• US 6,061,713 A
• Filed: 03/12/1997
• Issued: 05/09/2000
• Est. Priority Date: 03/12/1997
• Status: Expired due to Term

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Bharadhwaj, Rajeev
• Primary Examiner(s): Oberley, Alvin E.
• Assistant Examiner(s): COURTENAY III, ST JOHN
• Application Number:
  US08/815,742
• Time in Patent Office: 1,154 Days
• Field of Search: 709/300-305, 709/203-232, 709/101
• US Class Current: 709/203
• CPC Class Codes: G06F 9/54 Interprogram communication

Abstract

A system for managing communication between a client program and a server program. A port service module manages a plurality of domain ports. Each domain port has predefined characteristics which are used by the port service module to direct which server computer programs or which instances of server computer programs with which a client computer program will interact. The domain port characteristics also direct the port service module whether to order messages, count messages, and/or monitor for different types of error conditions in communications between the client program and the server program.

Claims

1. A computer implemented method for providing a client program with access to a service provided by a server program, comprising the steps of:

said client program requesting a global namer module for said service;

said client program receiving from said global namer module an identifier of a port service module having a port used to access said server program;

said client program requesting said port service module for said service; and

said port service module providing said port, and via said port, initiating an instance of said server program;

wherein said global namer module associates said service with said port, and said port service module associates said port with said server program, thereby eliminating the need for said client program and said server program to coordinate directly with one another as to naming of services.

2. The method of claim 1 wherein said port is selected from a plurality of ports, each supporting a different type of communication protocol.

3. The method of claim 1 wherein said port provides functions to said server program.

4. The method of claim 1 comprising the further step of said port service module using characteristics of said port to control communications between said client program and said server program, whereby the workload of said client program and said server program is reduced.

5. The method of claim 1 wherein said steps of said client program requesting a global namer module, and said client program requesting said port service module, use a name of said service.

6. The method of claim 1 further comprising the step of said port service module initiating at least one additional instance of said server program.

7. The method of claim 1 wherein said port is of a type selected from a group consisting of a domain array, a domain port, a domain group, and a domain object.

8. The method of claim 4 wherein said characteristics include monitoring different types of error conditions, and ordering, counting, compressing, encrypting, logging, mirroring, and striping a message exchanged between said client program and said server program.

9. The method of claim 4 wherein each of said characteristics is associated with a function.

10. The method of claim 6 wherein said step of said port service module initiating at least one additional instance is invisible to said client program.

11. The method of claim 6 wherein said step of said port service module initiating at least one additional instance uses one additional port service module for one of said at least one additional instance of said server program.

12. A client-server data processing system comprising:

a server node running a server program providing a service;

a client node running a client program accessing said service;

at least one port service module having a plurality of ports, associating said ports with a plurality of said server programs, and receiving a request for service from said client program; and

a global namer module for associating a plurality of said services with said ports and for providing the identity of an identified port service module having an identified port used to access said server program;

wherein, in response to said request, said identified port service module provides said identified port, and, via said port, initiates instances of said server program, and said system eliminates the need for said client program and said server program to coordinate directly with one another as to naming of services.

13. The system of claim 12 wherein each of said ports supports one communication protocol.

14. The system of claim 12 wherein said ports provide functions to said server program.

15. The system of claim 12 wherein said identified port service module uses characteristics of said identified port to control communications between said client program and said server program, whereby the workload of said client program and said server program is reduced.

16. The system of claim 12 wherein said client program uses a name of said service to request said service.

17. The system of claim 12 wherein said identified port service module initiates at least one additional instance of said server program.

18. The system of claim 15 wherein said characteristics include monitoring different types of error conditions, and ordering, counting, compressing, encrypting, logging, mirroring, and striping a message exchanged between said client program and said server program.

19. The system of claim 15 wherein each of said characteristics is associated with a function.

20. The system of claim 17 wherein said identified port service module initiating at least one additional instance is invisible to said client program.

21. The system of claim 17 wherein said identified port service module initiating at least one additional instance uses one additional port service module for one of said at least one additional instance of said server program.

22. The system of claim 12 wherein said identified port is selected from a group consisting of a domain array, a domain port, a domain group, and a domain object.

23. A computer-readable medium embodying program instructions for causing a computer to provide a client program with access to a service provided by a server program, by the steps of:

said client program requesting a global namer module for said service;

said client program receiving from said global namer module an identifier of a port service module having a port used to access said server program;

said client program requesting said port service module for said service; and

said port service module providing said port, and via said port, initiating an instance of said server program;

wherein said global namer module associates said service with said port, and said port service module associates said port with said server program, thereby eliminating the need for said client program and said server program to coordinate directly with one another as to naming of services.