The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 18, 2000
Filed:
Dec. 18, 1997
Ken M Cavanaugh, Montara, CA (US);
Christian J Callsen, Redwood City, CA (US);
Sun Microsystems, Inc., Palo Alto, CA (US);
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.