Method and apparatus for constructing stable iterators in a shar

Details Method and apparatus for constructing stable iterators in a shar Method and apparatus for constructing stable iterators in a shar

1997-12-18

2000-01-18

Black, Thomas G.

Data processing: database and file management or data structures

Database design

Data structure types

707 1, 707103, 707201, 707206, G06F 1730

Patent

active

060164891

ABSTRACT:
In a distributed object system, a stable object iterator provides a list of all persistent objects within a collection of objects. A plurality of iterators are supported in another aspect of the invention. An iterator associates a label with each persistent object in a collection of stable objects. The label indicates whether the associated object was added to or deleted from the collection before or after the inception of an iterator. Multiple persistent iterators are supported by providing an indication of which iterators each persistent object is, or is not, "visible" to. Should an element of the persistent object collection be created after one or more iterators is created, that element is "invisible" to those iterators. Objects that exist when one or more iterators are created remain "visible" to those iterators, even if the object is deleted from the collection while those iterators still exist. The system maintains an indication of all extent iterators and of maximum and minimum iterator identifiers which respectively correspond to the most recently created and least recently created iterators.

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