System and method for maintaining stateful information

• US 8,200,751 B2
• Filed: 05/19/2009
• Issued: 06/12/2012
• Est. Priority Date: 05/20/2008
• Status: Active Grant

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Leedberg, Gregory, Carey, Kenneth D.
• Primary Examiner(s): Fan, Hua
• Application Number:
  US12/468,099
• Publication Number:
  US 20090292760A1
• Time in Patent Office: 1,120 Days
• Field of Search: 709/203
• US Class Current: 709/203
• CPC Class Codes: G06F 9/546 Message passing systems or structures, e.g. queues
• CPC Class Codes: H04L 51/043 using or handling presence information
• CPC Class Codes: H04L 51/214 using selective forwarding
• CPC Class Codes: H04L 51/58 Message adaptation for wireless communication
• CPC Class Codes: H04L 67/306 User profiles
• CPC Class Codes: H04L 67/54 Presence management, e.g. monitoring or registration for receipt of user log-on information, or the connection status of the users
• CPC Class Codes: H04L 67/56 Provisioning of proxy services store-and-forward switching systems in data switching networks H04L12/54
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching

Abstract

A system for maintaining stateful information includes a client proxy configured to receive and collect status information associated with a client, and a state machine executing on a processor to collect and store the status information in a memory and provide stateful information associated with the client. The client may be a stateless client and the state machine may be configured to maintain stateful information associated with the stateless client. The state machine is may be configured to collect and store information intended for the client and provide the stored information to the client. The system may further include a client status processor configured to process the status information associated with the client and to provide the status information to the client proxy to control the stateful information.

Claims

1. A system for maintaining stateful information, comprising:

a microprocessor;

a plurality of clients comprising at least one stateful client and at least one stateless client;

a client proxy configured to receive and collect status information associated with each client of the plurality of clients; and

a state machine executing on the microprocessor and performing the following;

receive the status information from the client proxy and store the received status information in a memory, the received status information associated with the at least one stateful client indicating that the at least one stateful client is unavailable due to interruption of service, wherein the interruption of service includes at least one of;

a loss of a wireless messaging service and a loss of a geographic positioning service;

provide to other clients engaged with the at least one stateful client constant connections to provide stateful information associated with the at least one stateful client when the at least one stateful client is unavailable due to the interruption of service to the at least one stateful client and to provide an indication that the at least one stateful client is still online despite the interruption of service and despite that the status information received from the client proxy indicates that the at least one stateful client is unavailable;

provide to other clients engaged with the at least one stateless client stateful information associated with the at least one stateless client;

receive updates from the other clients engaged with the at least one stateful client; and

provide the updates to the at least one stateful client when the at least one stateful client becomes available.

2. The system of claim 1, wherein the client proxy includes a plurality of client proxies, each associated with a different client.

3. The system of claim 1, wherein the stateful information associated with the at least one stateful client and the stateful information associated with the at least one stateless client comprises:

a unique client identifier; and

a client status.

4. The system of claim 3, wherein the stateful information associated with the at least one stateful client and the stateful information associated with the at least one stateless client further comprises a client activity.

5. The system of claim 1, wherein the status information is controlled by at least one of the plurality of clients.

6. An apparatus for maintaining stateful information, comprising a non-transitory storage medium having stored instructions thereon that when executed by a machine result in the following:

receiving status information from a client proxy and storing the received status information in a memory, the received status information associated with each client of a plurality of clients comprising at least one stateful client and at least one stateless client, the received status information associated with the at least one stateful client indicating that the at least one stateful client is unavailable due to interruption of service, wherein the interruption of service includes at least one of;

a loss of a wireless messaging service and a loss of a geographic positioning service;

providing to other clients engaged with the at least one stateful client constant connections to provide stateful information associated with the at least one stateful client when the at least one stateful client is unavailable due to the interruption of service to the at least one stateful client and to provide an indication that the at least one stateful client is still online despite the interruption of service and despite that the status information received from the client proxy indicates that the at least one stateful client is unavailable;

providing to other clients engaged with the at least one stateless client stateful information associated with the at least one stateless client;

receiving updates from the other clients engaged with the at least one stateful client; and

providing the updates to the at least one stateful client when the at least one stateful client becomes available.

7. The article of claim 6, wherein the stateful information associated with the at least one stateful client and the stateful information associated with the at least one stateless client comprises:

a unique client identifier; and

a client status.

8. The article of claim 7, wherein the stateful information associated with the at least one stateful client and the stateful information associated with the at least one stateless client further comprises a client activity.