Methods and systems for joining a real-time session of presentation layer protocol data

• US 8,296,441 B2
• Filed: 10/30/2009
• Issued: 10/23/2012
• Est. Priority Date: 01/14/2005
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Ryman, Paul
• Primary Examiner(s): Chan, Wing
• Assistant Examiner(s): Baturay, Alicia
• Application Number:
  US12/609,731
• Publication Number:
  US 20100049783A1
• Time in Patent Office: 1,089 Days
• Field of Search: 709/227
• US Class Current: 709/227
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 67/14 Session management for real-time applications in data packet communications networks H04L65/1066
• CPC Class Codes: H04L 67/145 avoiding end of session, e.g. keep-alive, heartbeats, resumption message or wake-up for inactive or interrupted session
• CPC Class Codes: H04L 69/327 in the session layer [OSI layer 5]
• 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

Methods and systems directed to joining a real-time user session of presentation layer protocol data. The methods describe a user session receiving a presentation layer protocol data stream, wherein the user session comprises a single presentation layer protocol stack. The protocol stack sending a request to a virtual channel to reinitialize. The virtual channel processing an existing request until the request to reinitialize is encountered. The protocol stack modifying the presentation layer protocol data stream to contain a marker. The systems describe a single presentation layer protocol stack. The protocol stack includes a receiver, a virtual channel, and a rollover agent. The receiver receives a presentation layer protocol data stream and receives a message initiating reinitialization. The virtual channel processes a request. The rollover agent sends to the virtual channel a request to reinitialize and modifies the presentation layer protocol data stream to contain a marker.

Claims

1. A method for joining a real-time user session of presentation layer protocol data, the method comprising:

(a) receiving, by a user session executing on a server, a presentation layer protocol data stream from a client agent executing on a client computing device, wherein the user session comprises a single presentation layer protocol stack;

(b) sending, by the single presentation layer protocol stack, to a virtual channel module stored in memory, a request to reinitialize;

(c) processing, by the virtual channel module stored in memory and executed by a processing circuit, an existing request until the request to reinitialize is encountered; and

(d) modifying, by the single presentation layer protocol stack, the presentation layer protocol data stream to contain a marker; and

(e) resetting, by the single presentation layer protocol stack, a virtual channel state machine to an original state in response to the request to reinitialize;

wherein the request to reinitialize the virtual channel is sent in response to receiving a request to initiate a rollover from a shadowing agent service executing on the server; and

(f) receiving, by the user session, a second presentation layer protocol data stream from a shadowing agent service executing on a server.

2. The method of claim 1, further comprising extracting, by the single presentation layer protocol stack, the presentation layer protocol data stream to a buffer.

3. The method of claim 1, further comprising pausing, by the virtual channel module stored in memory, the existing request until after the request to reinitialize is processed.

4. The method of claim 1, further comprising receiving, by the single presentation layer protocol stack, the request to initiate a rollover responsive to a connection request from a second computing device.

5. The method of claim 1, further comprising receiving, by the single presentation layer protocol stack, the request to initiate a rollover responsive to a durational threshold being met.

6. The method of claim 1, further comprising receiving, by the single presentation layer protocol stack, the request to initiate a rollover responsive to a file size threshold being met.

7. A system for joining a real-time user session of presentation layer protocol data comprising:

a single presentation layer protocol stack contained within the real-time user session executing on a server comprising;

a receiver module stored in memory and executed by a processing circuit to;

receive a presentation layer protocol data stream from a client agent executing on a client computing device;

a virtual channel module stored in memory, and executed by a processing circuit to;

processes a request; and

a rollover agent module stored in memory, and executed by a processing circuit to;

send to the virtual channel a request to reinitialize; and

modify the presentation layer protocol data stream to contain a marker;

wherein the request to reinitialize the virtual channel is sent in response to receiving a request to initiate a rollover from a shadowing agent service executing on the server using a processing circuit and the single presentation layer protocol stack resets a virtual channel state machine to an original state in response to the request to reinitialize and wherein the user session receives a second presentation layer protocol data stream from a shadowing agent service executing on a server.

8. The system of claim 7, wherein the single presentation layer protocol stack extracts the presentation layer protocol data stream to a buffer.

9. The system of claim 7, wherein the virtual channel module pauses the existing request until after the request to reinitialize is processed.

10. The system of claim 7, wherein the single presentation layer protocol stack receives the request to initiate a rollover responsive to a connection request from a second computing device.

11. The system of claim 7, wherein the single presentation layer protocol stack receives the request to initiate a rollover responsive to a durational threshold being met.

12. The system of claim 7, wherein the single presentation layer protocol stack receives the request to initiate a rollover responsive to a file size threshold being met.