About consistency among versions in the runtime version management for objects

摘要

We are studying a mechanism to modify or expand software systems while they are running. Our approach is based on the runtime version management of objects. We are developing several tools to implement the mechanism. However, this mechanism has some problems about consistency among versions when two or more objects have multiple versions simultaneously. This paper will describe an overview of our runtime version management mechanism for objects, the problems about the consistency among versions, and our future plan to resolve the problems.