Sharing objects in runtime systems

US7415704B2 · kind B2 · utility

Assignee

• SAP AG · DE

Inventors

• Oliver Schmidt · Wörth am Rhein, DE
• Norbert Kuck · Karlsruhe, DE
• Edgar Lott · Schallstadt, DE
• Martin Strassburger · Espelkamp, DE
• Arno Hilgenberg · Mannheim, DE
• Ralf Schmelter · Wiesloch, DE

Key dates

• Filing date: May 20, 2004
• Grant date: Aug 19, 2008
• Expiry date: Feb 16, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F9/4488
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Methods and apparatus, including computer systems and program products, for sharing data objects in runtime systems. An identification of a first data object in a first runtime system is received. The first data object references zero or more referenced data objects. A shared closure of data objects, which consists of the first data object and a transitive closure of the referenced data objects, is identified, and a determination is made as to whether the shared closure of data objects is usable in a second runtime system. In some implementations, determining whether a shared closure is usable in a second runtime system includes determining whether each data object in the shared closure is serializable without execution of custom code, or determining whether the runtime class of each object instance in the shared closure is shareable. Using shared closures to share objects between runtime systems can provide isolation between user sessions.