Method and system for intra-document object locking in collaborative authoring

• US 8,595,202 B2
• Filed: 08/26/2008
• Issued: 11/26/2013
• Est. Priority Date: 10/03/2007
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Lo, George, Lange, Ronald
• Primary Examiner(s): Vy, Hung T
• Application Number:
  US12/229,662
• Publication Number:
  US 20090094242A1
• Time in Patent Office: 1,918 Days
• Field of Search: 707/704, 711/152
• US Class Current: 707/704
• CPC Class Codes: G06F 16/1774 Locking methods, e.g. locking methods for file systems allowing shared and concurrent access to files
• CPC Class Codes: G06F 9/526 Mutual exclusion algorithms

Abstract

A collaborative authoring system and method is disclosed. A collaboration server stores objects and applications open the objects stored on the collaboration server as documents. Collaborative authoring is enabled through a combination of coarse-grained server locks on objects stored in a collaboration server for short term server transactions and fine-grained application specific internal locks to lock portions of documents for authoring sessions. When an application begins an authoring session, an object stored in the collaboration server is opened as a document in an application, a server lock is applied to the object, internal locks are applied to portions of the document, and the server lock is removed from the object.

Claims

1. A method for enabling collaborative authoring of a document stored as an object on a collaboration server by one or more applications, comprising:

opening an object stored on a collaboration server as a document in an application;

applying a server lock to said object;

applying internal locks to portions of the document while said object is locked with the server lock;

removing said server lock from said object;

modifying said portions of the document in said application;

re-applying the server lock to said object;

removing said internal locks from said portions of the document;

writing the modified portions of the document back to said object in the collaboration server; and

removing said server lock from said object.

2. The method of claim 1, wherein said step of applying internal locks to portions of the document comprises:

applying the internal locks to said portions of the document;

opening said object as a temporary document in said application after applying the server lock to said object;

copying said the internal locks in said document to said temporary document;

writing said temporary document including said internal locks to said object store on the collaboration server; and

updating said portions of the document with corresponding portions of said temporary document.

3. The method of claim 2, wherein said temporary document includes modifications from another application made after said object was opened as said document in said application.

4. The method of claim 1, wherein said step of writing the modified portions of the document back to said object in the collaboration server comprises:

opening said object as a temporary document in said application after applying the server lock to said object;

updating said temporary document with the modified portions of said document; and

writing said temporary document back to said object in the collaboration server.

5. The method of claim 4, wherein said temporary document includes modifications made after said internal locks were applied to said portions of the document.

6. The method of claim 1, wherein said object is a Binary Large Object (BLOB).

7. The method of claim 1, wherein said step of applying internal locks to portions of the document comprises:

loading a lock-object stored in the collaboration server and associated with said object; and

storing information regarding said internal locks in said lock-object.

8. The method of claim 1, further comprising:

determining that said portions of the document reference other document portions of another document; and

applying a soft-lock to said other document portions of another document for a duration of the internal locks applied to said portions of the document.

9. An apparatus for enabling collaborative authoring of a document stored as an object on a collaboration server by one or more applications, comprising:

means for opening an object stored on a collaboration server as a document in an application;

means for applying a server lock to said object;

means for applying internal locks to portions of the document while said object is locked with the server lock;

means for removing said server lock from said object;

means for modifying said portions of the document in said application;

means for re-applying said server lock to said object;

means for removing said internal locks from said portions of the document;

means for writing the modified portions of the document back to said object in the collaboration server; and

means for removing said server lock from said object.

10. The apparatus of claim 9, wherein said means for applying internal locks to portions of the document comprises:

means for applying the internal locks to said portions of the document;

means for opening said object as a temporary document in said application after applying the server lock to said object;

means for copying said the internal locks in said document to said temporary document;

means for writing said temporary document including said internal locks to said object store on the collaboration server; and

means for updating said portions of the document with corresponding portions of said temporary document.

11. The apparatus of claim 9, wherein said means for writing the modified portions of the document back to said object in the collaboration server comprises:

means for opening said object as a temporary document in said application after applying the server lock to said object;

means for updating said temporary document with the modified portions of said document; and

means for writing said temporary document back to said object in the collaboration server.

12. The apparatus of claim 9, wherein said means for applying internal locks to portions of the document comprises:

means for loading a lock-object stored in the collaboration server and associated with said object; and

means for storing information regarding said internal locks in said lock-object.

13. The apparatus of claim 9, further comprising:

means for determining that said portions of the document reference other document portions of another document; and

means for applying a soft-lock to said other document portions of another document for a duration of the internal locks applied to said portions of the document.

14. A non-transitory computer readable medium encoded with computer executable instructions for enabling collaborative authoring of a document stored as an object on a collaboration server by one or more applications, the computer executable instructions defining steps comprising:

opening an object stored on a collaboration server as a document in an application;

applying a server lock to said object;

applying internal locks to portions of the document while said object is locked with the server lock;

removing said server lock from said object;

modifying said portions of the document in said application;

re-applying said server lock to said object;

removing said internal locks from said portions of the document;

writing the modified portions of the document back to said object in the collaboration server; and

removing said server lock from said object.

15. The computer readable medium of claim 14, wherein the computer executable instructions defining the step of applying internal locks to portions of the document comprise computer executable instructions defining the steps of:

applying the internal locks to said portions of the document;

opening said object as a temporary document in said application after applying the server lock to said object;

copying said the internal locks in said document to said temporary document;

writing said temporary document including said internal locks to said object store on the collaboration server; and

updating said portions of the document with corresponding portions of said temporary document.

16. The computer readable medium of claim 14, wherein the computer executable instructions defining the step of writing the modified portions of the document back to said object in the collaboration server comprise computer executable instructions defining the steps of:

opening said object as a temporary document in said application after applying the server lock to said object;

updating said temporary document with the modified portions of said document; and

writing said temporary document back to said object in the collaboration server.

17. The computer readable medium of claim 14, wherein the computer executable instructions defining the step of applying internal locks to portions of the document comprise computer executable instructions defining the steps of:

loading a lock-object stored in the collaboration server and associated with said object; and

storing information regarding said internal locks in said lock-object.

18. The computer readable medium of claim 14, further comprising computer executable instructions defining the steps of:

determining that said portions of the document reference other document portions of another document; and

applying a soft-lock to said other document portions of another document for a duration of the internal locks applied to said portions of the document.

19. A collaborative authoring system, comprising:

a collaboration server configured to store objects and configured to enforce server locks applied to stored objects, such that when a server lock is applied to an object by an application, the collaboration server only allows the application that applied the server lock to have write access to the object; and

a plurality of client applications, each application configured to open objects stored in the collaboration server as documents in the application, and apply internal locks to portions of the documents opened in the application for an authoring session on the locked portions of the documents,

wherein when portions of a document are locked with internal locks for an authoring session in an application, the server lock is removed from the object in the collaboration server corresponding to the document to allow other applications to author other portions of the document.

20. The collaborative authoring system of claim 19, wherein the objects are stored in the collaboration server as Binary Large Objects (BLOBs).

21. The collaborative authoring system of claim 19, wherein each of the client applications is configured to apply internal locks to document portions having variable granularity.