Method and system for maintaining synchronization between a local data cache and a data store

• US 7,865,463 B2
• Filed: 12/22/2008
• Issued: 01/04/2011
• Est. Priority Date: 08/29/2003
• Status: Active Grant

• Current Assignee: Energetic Power Investment Limited
• Original Assignee: Yahoo! Inc. (Apollo Global Management, Inc.)
• Inventors: Seitz, Edward F., Sollicito, Vincent L.
• Primary Examiner(s): LEWIS, CHERYL RENEA
• Application Number:
  US12/341,955
• Publication Number:
  US 20090138568A1
• Time in Patent Office: 743 Days
• Field of Search: 707/609, 707/610, 707/813, 707/999.001, 707/999.008, 707/999.2, 707/805, 709/203
• US Class Current: 707/610
• CPC Class Codes: G06F 16/9574 of access to content, e.g. by caching
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• 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 67/142 Managing session states for stateless protocols; Signalling session states; State transitions; Keeping-state mechanisms
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]
• CPC Class Codes: Y10S 707/99938 Concurrency, e.g. lock management in shared database
• CPC Class Codes: Y10S 707/99953 Recoverability

Abstract

A method and system for maintaining synchronization between a local data cache and a data store is disclosed. The method includes comparing first validation information and second validation information, and synchronizing first data stored in a local data cache with second data stored in a data store, if the comparison indicates that the synchronizing is needed.

Claims

1. A server computer comprising:

an interface in communication with a client computer, wherein said interface is communicatively coupled to a local data cache of the client computer and storing local validation information, said server computer operatively coupled to a data store and comprising a processor configured to examine said local validation information and synchronize said local data cache with said data store if said local validation information indicates that said local data cache is not synchronized with said data store.

2. The server computer of claim 1, wherein the processor is configured to compare said local validation information and current validation information.

3. The server computer of claim 2, wherein said processor is configured to use synchronization information.

4. The server computer of claim 3, wherein said processor is configured to generate said synchronization information, if said local validation information indicates that said local data cache is not synchronized with said data store.

5. The server computer of claim 3, wherein said processor is configured to serve data from said data store in response to receiving said synchronization information.

6. A method, comprising:

comparing, by a client computer, first validation information and second validation information; and

synchronizing, by the client computer, first data stored in a local data cache of a client computer with second data stored in a data store of a server computer, if said comparing indicates said synchronizing is needed.

7. The method of claim 6, further comprising receiving said first validation information.

8. The method of claim 7, wherein said local data cache comprises said second validation information.

9. The method of claim 7, wherein said synchronizing comprises deleting said first data from said local data cache, and writing said second data to said local data cache.

10. The method of claim 7, wherein said synchronizing comprises deleting said local data cache, and writing a new local data cache.

11. The method of claim 7, wherein said receiving said first validation information is performed by the client computer, said client computer is communicatively coupled to said server computer, said synchronizing comprises sending synchronization information to said server computer, and said data store is operably coupled to said server computer.

12. The method of claim 11, further comprising storing said local data cache as a file in a directory structure of said client computer.

13. A computer readable storage medium comprising computer instructions tangibly stored thereon and executed by a processor, the computer instructions comprising:

a first set of instructions, executable by the processor, configured to compare first validation information and second validation information; and

a second set of instructions, executable by the processor, configured to synchronize first data stored in a local data cache with second data stored in a data store, if said comparing indicates said synchronizing is needed.

14. The computer readable storage medium of claim 13, further comprising a third set of instructions, executable by the processor, configured to receive said first validation information.

15. The computer readable storage medium of claim 14, wherein said local data cache comprises said second validation information.

16. The computer readable storage medium of claim 14, wherein said second set of instructions comprises,

first subset of instructions, executable by the processor, configured to delete said first data from said local data cache;

and

a second subset of instructions, executable by the processor, configured to write said second data to said local data cache.