Cynthia F Ross

US Patent:

53136292, May 17, 1994

Filed:

Oct 23, 1989

Appl. No.:

7/425607

Inventors:

Robert L. Abraham - Marietta GA
Richard E. Moore - Marietta GA
William L. Rich - Stone Mountain GA
Floyd W. Shackelford - Buford GA
John R. Tiller - Peachtree GA
Cynthia A. Ross - Boynton Beach FL
Richard S. Briggs - Bloomingdale IL

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1540

US Classification:

395600

Abstract:

A Unit of Work object class for an object oriented database management system provides concurrent processing through Unit of Work levels and instances while maintaining the integrity of the data in the database. Each new Unit of Work assigned to a task is an instance of the Unit of Work object class. A Unit of Work manager controls each step such that manipulation of the data occurs to the copies at that particular level for that particular instance. Only after all levels have been completed satisfactorily will a "Commit" occur to the data in the database. If completion is not satisfactory, Rollback of the levels occur, thus preserving data integrity. The Unit of Work manager can also switch control between Unit of Work instances, thus permitting simultaneous performance of tasks.

US Patent:

52915930, Mar 1, 1994

Filed:

Oct 24, 1990

Appl. No.:

7/602575

Inventors:

Robert L. Abraham - Marietta GA
Cynthia A. Ross - Boynton Beach FL
Richard E. Moore - Marietta GA
William L. Rich - Stone Mountain GA
Floyd W. Shackelford - Buford GA
John R. Tiller - Peachtree City GA
Richard S. Briggs - Bloomingdale IL

Assignee:

International Business Machines Corp. - Armonk NY

International Classification:

G06F 1540
G06F 710

US Classification:

395600

Abstract:

A data structure and method for uniquely identifying, and optimizing access to, object instances in an object oriented programming environment on a data processor containing a memory. Objects are categorized into one or more classes which define the method of the categorized objects, and messages are sent by the data processor to objects to perform actions. The data structure consists of a persistent portion containing a unique object identifier and a non-persistent portion containing the access address of an instance data frame in memory. The access address is set to the address of the instance data frame control block when the message is sent in order to optimize subsequent messages to the same object instance. The instance data frame control blocks are not allocated in memory until a first message is sent to an instance.