Caching for high-performance web applications

1. A data-caching system comprising:

a remote data source;

a processor;

a memory in communication with the processor, the memory configured to store a plurality of instructions executable by the processor to cause the system to:

provide, by the processor, a web browser application, the web browser application configured to generate a request to receive a data object from the remote data source,

wherein the memory is further configured to store a plurality of syncer delegate instructions executable by the processor on which the web browser is operating to cause the system to:

intercept the request from the web browser application;

determine whether the requested data object is available in the memory;

simultaneously provide the requested data object from the memory to the web browser application based on the web browser application being visible at a time of generating the request and forward the request to the remote data source via a network;

receive the requested data object from the remote data source via the network; and

provide the received data object to the web browser application when a determination is made that the received data object is newer than the requested data object based on a timestamp that indicates when the data object in the memory was last updated and store the received data object in the memory.

2. The system of claim 1 , wherein the memory is further configured to store a version attribute for each data object stored in the memory.

3. The system of claim 2 , wherein the request further comprises a request for a plurality of data objects; and further comprising syncer delegate instructions to:

include a plurality of first version attributes for the plurality of requested data objects in the request forwarded to the remote data source via the network; and

receive only those requested data objects from the remote data source having a second version attribute that indicates a same or newer version than the first version attribute.

4. The system of claim 1 , further comprising instructions to:

generate an encryption key; and

create a session, the session associated with a session data object that stores the encryption key, a session identifier, and a version attribute that identifies a version of the encryption key.

5. The system of claim 4 , further comprising instructions to generate a browser cookie, the browser cookie comprising:

a user ID field that identifies a current user; and

a session ID field including the session identifier.

6. The system of claim 4 , further comprising instructions to:

transfer the encryption key from the session data object to the web browser application; and

encrypt the received data object using the encryption key prior to storing the received data object in the memory.

7. The system of claim 5 , further comprising instructions to:

generate an encryption key;

determine that a user ID of a current user of the web browser application matches the user ID field;

determine that a first version attribute of a session data object that identifies a version of an encryption key matches a second version attribute that identifies a current version of the encryption key, the second version attribute stored in a data store of the web browser application; and

transfer the encryption key to the web browser application.

8. The system of claim 1 , wherein the remote data source is configured to transmit a first encryption key version attribute of an encryption key; and

further comprising instructions to:

compare the first encryption key version attribute with a second encryption key version attribute, the second encryption key version attribute stored in a data store of the web browser application;

determine that the first encryption key version attribute reflects a more recent version of the encryption key than the second encryption key version attribute;

overwrite the second encryption key version attribute with the first encryption key version attribute; and

erase a data object encrypted using the encryption key associated with the first encryption key version attribute from the memory.

9. The system of claim 1 , further comprising instructions to:

generate a browser cookie, the browser cookie comprising the timestamp that indicates when the memory was last updated; and

defer data reads from the remote data source based on the timestamp.

10. The system of claim 1 , wherein the web browser application further comprises a first web browser application and a second web browser application, and further comprising instructions to:

determine that at least one of the first web browser application and the second web browser application are not currently visible to a user of the system; and

further comprising syncer delegate instructions to deny access to the memory for a request generated by at least one of the first web browser application and the second web browser application that are not currently visible to the user of the system.

11. A method comprising:

intercepting a request for a data object from a web browser application to a remote data source;

determining, on a computerized device on which the web browser application is operating, whether the requested data object is available in a memory of the computerized device;

simultaneously providing the requested data object from the memory to the web browser application based on the web browser application being visible at a time of generating the request and forwarding the request to the remote data source via a computerized communications network;

receiving the requested data object from the remote data source via the computerized communications network; and

providing the received data object to the web browser application when a determination is made that the received data object is newer than the requested data object based on a timestamp that indicates when the data object in the memory was last updated and storing the received data object in the memory.

12. The method of claim 11 , wherein the memory is further configured to store a version attribute for each data object stored in the memory.

13. The system of claim 12 , wherein the request further comprises a request for a plurality of data objects; the method further comprising:

including a plurality of first version attributes for the plurality of requested data objects in the request forwarded to the remote data source via the computerized communications network; and

receiving only those requested data objects from the remote data source having a second version attribute that indicates a same or newer version than the first version attribute.

14. The method of claim 11 , further comprising:

generating an encryption key; and

creating a session, the session associated with a session data object that stores the encryption key, a session identifier, and a version attribute that identifies a version of the encryption key.

15. The method of claim 14 , further comprising generating a browser cookie, the browser cookie comprising:

a user ID field that identifies a current user; and

a session ID field including the session identifier.

16. The method of claim 14 , further comprising:

transferring the encryption key from the session data object to the web browser application; and

encrypting the received data object using the encryption key prior to storing the received data object in the memory.

17. The method of claim 11 , further comprising:

generating an encryption key;

determining that a user ID of a current user of the web browser application matches the user ID field;

determining that a first version attribute of a session data object that identifies a version of an encryption key matches a second version attribute that identifies a current version of the encryption key, the second version attribute stored in a data store of the web browser application; and

transferring the encryption key to the web browser application.

18. The method of claim 11 , further comprising:

transmitting a first encryption key attribute of an encryption key;

comparing the first encryption key version attribute with a second encryption key version attribute, the second encryption key version attribute stored in a data store of the web browser application;

determining that the first encryption key version attribute reflects a more recent version of the encryption key than the second encryption key version attribute;

overwriting the second encryption key version attribute with the first encryption key version attribute; and

erasing a data object encrypted using the encryption key associated with the first encryption key version attribute from the memory.

19. The method of claim 11 , further comprising:

generating a browser cookie, the browser cookie comprising the timestamp that indicates when the memory was last updated; and

deferring data reads from the remote data source based on the timestamp.

20. The method of claim 11 , wherein the web browser application further comprises a first web browser application and a second web browser application, and the method further comprises:

determining that at least one of the first web browser application and the second web browser application are not currently visible to a user of the system; and

denying access to the memory for a request generated by at least one of the first web browser application and the second web browser application that are not currently visible to the user of the system.