METHOD AND SYSTEM FOR MAINTAINING SYNCHRONIZATION BETWEEN A LOCAL DATA CACHE AND A DATA STORE

• US 20090138568A1
• Filed: 12/22/2008
• Published: 05/28/2009
• Est. Priority Date: 08/29/2003
• Status: Active Grant

• Current Assignee: Energetic Power Investment Limited
• Original Assignee: Yahoo! Inc. (Apollo Global Management, Inc.)
• Inventors: SOLLICITO, Vincent L., Seitz, Edward F.
• Granted Patent: US 7,865,463 B2
• Time in Patent Office: Days
• US Class Current: 709/215
• 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. An apparatus comprising:

a local data cache, wherein said local data cache comprises local validation information; and

a server, wherein

said server is communicatively coupled to said local data cache,

said server is operatively coupled to a data store,

said server is configured to examine said local validation information, and

said server is configured to 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 apparatus of claim 1, wherein said server is configured to compare said local validation information and current validation information.

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

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

6. A computerized method, comprising:

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 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 comprising 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 a client,

said client is communicatively coupled to said server,

said synchronizing comprises sending synchronization information to said server, and

said data store is operably coupled to said server.

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

13. A computer program product comprising:

a first set of instructions, executable on a computer system, configured to compare first validation information and second validation information;

a second set of instructions, executable on said computer system, 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; and

computer readable media, wherein said computer program product is encoded in said computer readable media.

14. The computer program product of claim 13, further comprising a third set of instructions, executable on said computer system, configured to receive said first validation information.

15. The computer program product of claim 14, wherein said local data cache comprises said second validation information.

16. The computer program product of claim 14, wherein said second set of instructions comprises,

a first subset of instructions, executable on said computer system, configured to delete said first data from said local data cache;

and

a second subset of instructions, executable on said computer system, configured to write said second data to said local data cache.