Caching data objects on a client side using a prototype chain

• US 8,862,830 B2
• Filed: 02/17/2012
• Issued: 10/14/2014
• Est. Priority Date: 02/17/2012
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Archdeacon, Philip A., Perkins, Chris, Qing, Xuebing, Tang, Sabrina
• Primary Examiner(s): BATAILLE, PIERRE MICHE
• Application Number:
  US13/399,859
• Publication Number:
  US 20130219127A1
• Time in Patent Office: 970 Days
• Field of Search: 711/144, 711/145, 711/E12.001, 711/E12.041
• US Class Current: 711/144
• CPC Class Codes: G06F 12/08 in hierarchically structured memory systems, e.g. virtual memory systems
• CPC Class Codes: G06F 16/958 Organisation or management of web site content, e.g. publishing, maintaining pages or automatic linking

Abstract

Provided are a computer implemented method, computer program product, and system for caching a data object. A copy of an original data object to a specified depth is obtained. The copy of the original data object to the specified depth is cached with reference to the original data object in a prototype chain. A change to a value of a property of the cached copy is received. A new property entry is created for the changed value of the property under the cached copy. A change flag is set to indicate that there is a changed value for the property.

Claims

1. A method for caching a data object, comprising:

obtaining, with a processor of a computer, a copy of an original data object to a specified depth;

caching the copy of the original data object to the specified depth with reference to the original data object in a prototype chain;

receiving a change to a value of a property of the cached copy;

creating a new property entry for the changed value of the property of the cached copy;

setting a change flag to indicate that there is a changed value for the property;

receiving a submit operation for the cached copy of the data object; and

for the property of the cached copy,

determining whether the value of the property has changed;

in response to determining that the value of the property has changed,

updating a value of a corresponding property of the original data object; and

resetting the change flag to indicate that the value of the property of the cached copy is a same as the value of the corresponding property of the original data object.

2. The method of claim 1, wherein the determination of whether the value of the property has changed further comprises:

checking the change flag.

3. The method of claim 1, further comprising:

in response to determining that the original data object is an array and that a length of the cached copy has changed, updating a length of the original data object to the length of the cached copy.

4. The method of claim 1, wherein the cached copy points to the original data object without copying the data of the original data object.

5. The method of claim 1, wherein the depth identifies a level of a data object hierarchy of the original data object.

6. A computer system for caching a data object, comprising:

a processor; and

a storage device coupled to the processor, wherein the storage device has stored thereon a program, and wherein the processor is configured to execute instructions of the program to perform operations, wherein the operations comprise;

obtaining a copy of an original data object to a specified depth;

caching the copy of the original data object to the specified depth with reference to the original data object in a prototype chain;

receiving a change to a value of a property of the cached copy;

creating a new property entry for the changed value of the property of the cached copy;

setting a change flag to indicate that there is a changed value for the property;

receiving a submit operation for the cached copy of the data object; and

for the property of the cached copy,

determining whether the value of the property has changed;

in response to determining that the value of the property has changed,

updating a value of a corresponding property of the original data object; and

resetting the change flag to indicate that the value of the property of the cached copy is a same as the value of the corresponding property of the original data object.

7. The computer system of claim 6, wherein the operations for determination of whether the value of the property has changed further comprise:

checking the change flag.

8. The computer system of claim 6, wherein the operations further comprise:

in response to determining that the original data object is an array and that a length of the cached copy has changed, updating a length of the original data object to the length of the cached copy.

9. The computer system of claim 6, wherein the cached copy points to the original data object without copying the data of the original data object.

10. The computer system of claim 6, wherein the depth identifies a level of a data object hierarchy of the original data object.

11. A computer program product for caching a data object, the computer program product comprising:

a computer readable storage medium having computer readable program code embodied therein, the computer readable program code comprising;

computer readable program code, when executed by a processor of a computer, configured to perform;

obtaining a copy of an original data object to a specified depth;

caching the copy of the original data object to the specified depth with reference to the original data object in a prototype chain;

receiving a change to a value of a property of the cached copy;

creating a new property entry for the changed value of the property of the cached copy;

setting a change flag to indicate that there is a changed value for the property;

receiving a submit operation for the cached copy of the data object; and

for the property of the cached copy,

determining whether the value of the property has changed;

in response to determining that the value of the property has changed,

updating a value of a corresponding property of the original data object; and

resetting the change flag to indicate that the value of the property of the cached copy is a same as the value of the corresponding property of the original data object.

12. The computer program product of claim 11, wherein, for the determination of whether the value of the property has changed, the computer readable program code, when executed by the processor of the computer, is configured to perform

checking the change flag.

13. The computer program product of claim 11, wherein the computer readable program code, when executed by the processor of the computer, is configured to perform:

in response to determining that the original data object is an array and that a length of the cached copy has changed, updating a length of the original data object to the length of the cached copy.

14. The computer program product of claim 11, wherein the cached copy points to the original data object without copying the data of the original data object.

15. The computer program product of claim 11, wherein the depth identifies a level of a data object hierarchy of the original data object.