SYSTEMS AND METHODS OF MARKING LARGE OBJECTS AS NON-CACHEABLE

• US 20080140938A1
• Filed: 01/28/2008
• Published: 06/12/2008
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Application Networking LLC (Cloud Software Group)
• Inventors: ANNAMALAISAMI, Saravanakumar, KHEMANI, Prakash, KAILASH, Kailash, KUMAR, Lakshmi, SUNDARRAJAN, Prabakar, SONI, Ajay, SINHA, Rajiv
• Granted Patent: US 8,250,301 B2
• Time in Patent Office: Days
• US Class Current: 711/133
• CPC Class Codes: H04L 63/0485 Networking architectures for enhanced packet encryption processing, e.g. offloading of IPsec packet processing or efficient security association look-up
• CPC Class Codes: H04L 63/166 at the transport layer
• CPC Class Codes: H04L 63/168 above the transport layer
• CPC Class Codes: H04L 67/568 Storing data temporarily at an intermediate stage, e.g. caching

Abstract

A device that implements a method for performing integrated caching in a data communication network. The device is configured to receive a packet from a client over the data communication network, wherein the packet includes a request for an object. At the operating system/kernel level of the device, one or more of decryption processing of the packet, authentication and/or authorization of the client, and decompression of the request occurs prior to and integrated with caching operations. The caching operations include determining if the object resides within a cache, serving the request from the cache in response to a determination that the object is stored within the cache, and sending the request to a server in response to a determination that the object is not stored within the cache.

Claims

1. A method to maintain freshness of cached content based on demand for the cached content and remaining expiration time of the cached content, the method comprising the steps of:

(a) storing in a cache, by an appliance, an object served by a server in response to a first request from a client, the cached object having an expiry;

(b) receiving from the client, by the appliance, a second request for the object;

(c) determining, by the appliance in response to receiving the second request, a duration to the expiry of the cached object is less than a predetermined threshold;

(d) requesting, by the appliance in response to the determination, the object from the server;

(e) storing in the cache, by the appliance, the object received from the server in response to the request of the appliance.

2. The method of claim 1, wherein step (e) comprises refreshing the cache based on the object received from the server.

3. The method of claim 1, comprising transmitting, by the appliance, the cached object to the client in response to the second request.

4. The method of claim 1, comprising receiving, by the appliance, a third request for the object from one of the first client or a second client, and transmitting the cached object to one of the first client or the second client in response to the fourth request.

5. The method of claim 4, comprising determining, by the appliance in response to the third request, the duration to expiry of the cached object is not less than a predetermined threshold, and determining not to request the cached object from the server.

6. The method of claim 1, wherein step (d) comprises requesting, by the appliance, the object from the server in response to receiving a predetermined number of requests for the object.

7. The method of claim 1, comprising determining, by the appliance, from the cached object the expiry of the object.

8. The method of claim 1, comprising receiving, by the appliance, information of the expiry of the object from the server.

9. The method of claim 1, comprising storing, by the appliance, the object into the cache in a compressed form.

10. The method of claim 1, wherein step (a) comprises intercepting, by the appliance, the response to the first request served by the server to the first client.

11. A system for maintaining freshness of cached content based on demand for the cached content and remaining expiration time of the cached content, the system comprising:

means for storing in a cache, by an appliance, an object served by a server in response to a first request from a client, the cached object having an expiry;

means for receiving from the client, by the appliance, a second request for the object;

means for determining, by the appliance in response to receiving the second request, a duration to the expiry of the cached object is less than a predetermined threshold;

means for requesting, by the appliance in response to the determination, the object from the server; and

means storing in the cache, by the appliance, the object received from the server in response to the request of the appliance.

12. The system of claim 11, wherein the appliance refreshes the cache based on the object received from the server.

13. The system of claim 11, comprising means for transmitting, by the appliance, the cached object to the client in response to the second request.

14. The system of claim 11, comprising means for receiving, by the appliance, a third request for the object from one of the first client or a second client, and transmitting the cached object to one of the first client or the second client in response to the fourth request.

15. The system of claim 14, comprising means for determining, by the appliance in response to the third request, the duration to the expiry of the cached object is not less than a predetermined threshold, and determining not to request the cached object from the server.

16. The system of claim 11, comprising means for requesting, by the appliance, the object from the server in response to receiving a predetermined number of requests for the object.

17. The system of claim 11, comprising means from determining, by the appliance, from the cached object the expiry of the object.

18. The system of claim 11, comprising means for receiving, by the appliance, information of the expiry of the object from the server.

19. The system of claim 11, comprising means for storing, by the appliance, the object into the cache in a compressed form.

20. The system of claim 11, comprising means for intercepting, by the appliance, the response to the first request served by the server to the first client.