Re-establishing a connection for an application layer via a service layer using delay

• US 20070005773A1
• Filed: 05/31/2005
• Published: 01/04/2007
• Est. Priority Date: 05/31/2005
• Status: Abandoned Application

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Apreutesei, Elena, Undery, James, Kolluru, Nagendra, Ionescu, Radu
• Application Number:
  US11/142,895
• Publication Number:
  US 20070005773A1
• Time in Patent Office: Days
• US Class Current: 709/227
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers
• CPC Class Codes: H04L 67/1008 based on parameters of servers, e.g. available memory or workload monitoring of computer activity G06F11/30
• CPC Class Codes: H04L 67/101 based on network conditions
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

A method and system for establishing a connection with a server after a connection has been broken is provided. A connection system in a service layer of a client detects that a connection between the client and the server has been broken. Upon detecting the broken connection, the connection system of the service layer automatically attempts to re-establish an application-level connection to the server. If the connection system can re-establish an application-level connection to the server, then it need not notify the application layer of the broken connection.

Claims

1. A method in a computer system for establishing an application-level connection between a client and a server after the client is disconnected from the server, the client having an application layer and a service layer, the method comprising:

detecting at the service layer of the client that the client is no longer connected to the server; and

after detecting that the client is no longer connected to the server, selecting at the service layer a retry delay that is different for different clients; and

after the selected retry delay, attempting at the service layer to re-establish the application-level connection between the client and the server wherein the application layer is not notified of the attempt when the attempt is successful.

2. The method of claim 1 wherein when an attempt is not successful, selecting a longer retry delay, and after the selected longer retry delay, attempting to re-establish the application-level connection between the client and the server.

3. The method of claim 2 wherein the attempting is terminated after a retry time limit has expired.

4. The method of claim 2 wherein the selected retry delay is exponentially longer than a previous retry delay.

5. The method of claim 1 wherein the selected retry delay is based on a randomly generated number.

6. The method of claim 1 wherein application-level messages are transported to the server via a lower-level communications connection between the client and the server.

7. The method of claim 1 wherein the server is in a pool of servers that each provide services to clients.

8. The method of claim 1 including receiving a minimum retry delay from the server.

9. The method of claim 8 wherein the selected retry delay is based on the minimum retry delay.

10. A computer-readable medium for controlling a service layer to log a client on to a server by a method comprising:

detecting that the client is no longer logged on to the server; and

after detecting that the client is no longer logged on to the server,

selecting a retry delay that is different for some clients; and

after the selected retry delay, attempting to log the client on to the server, wherein an application layer of the client is not notified of the attempt when the attempt is successful.

11. The computer-readable medium of claim 10 wherein when an attempt is not successful, selecting a longer retry delay and after the selected longer retry delay, attempting to log the client on to the server.

12. The computer-readable medium of claim 11 wherein the attempting is terminated after a retry time limit has expired.

13. The computer-readable medium of claim 11 wherein the selected retry delay is exponentially longer than a previous retry delay.

14. The computer-readable medium of claim 10 wherein the selected retry delay is based on a randomly generated number.

15. The computer-readable medium of claim 10 wherein the client is logged on to the server via an application-level connection between the client and the server.

16. The computer-readable medium of claim 10 including receiving a minimum retry delay from the server.

17. The computer-readable medium of claim 16 wherein the selected retry delay is at least the minimum retry delay.

18. A service layer system for establishing an application-level connection between a client and a server after the connection is broken, the client having an application layer and a service layer, comprising:

a component that detects that an application-level connection between the client and the server has been broken;

a component that selects a retry delay that is different for different clients after detecting that the application-level connection is broken; and

a component that attempts to re-establish the application-level connection between the client and the server after the selected retry delay.

19. The system of claim 18 wherein when an attempt is not successful, selecting a longer retry delay, and after the selected longer retry delay, attempting to re-establish the application-level connection between the client and the server.

20. The system of claim 18 wherein the attempting is terminated after a retry time limit has expired.