System and method for applying visitor lock and persistent lock

Details System and method for applying visitor lock and persistent lock System and method for applying visitor lock and persistent lock

1995-05-19

1996-01-30

Black, Thomas G.

Boots, shoes, and leggings

364DIG1, 3642287, 3642466, 3642813, 3642814, 3642817, 3642821, 364286, G06F 1730

Patent

active

054887216

ABSTRACT:
Boundary control of units of work in an object oriented computing environment is provided by a visitor locking system and method and a persistent object locking system and method. The object management table includes a visitor lock flag and a persistent lock flag for each unit of work. The object manager prevents copying of an object from a first unit of work to a second unit of work in response to the visitor lock flag associated with the first unit of work being in a first state, and allows copying of the object from the first unit of work to the second unit of work in response to the visitor lock flag being in a second state. The object manager also locks an object from a first unit of work in response to the persistent lock flag associated therewith being in a first state, and unlocks the object from the first unit of work in response to the persistent lock flag being in a second state. Copying and locking may apply to persistent objects only. Locking may prevent addition of objects to, and deletion of objects from, the unit of work.

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