Adaptable access strategies provide a high usefulness of the objects in an open distributed environment

Abstract

New applications are being introduced for different areas such as commercial, education, and medical etc. A significant effort has been made in developing some of these applications considering the adaptability to the dynamically changing network and hosts' environments. In client-server applications, this adaptability is very important to enhance the reliability of the system and maintain the consistency of the objects. We describe a framework that can detect the changes in performance of the execution environment, and provide strategies in order to adapt such changes. Using these access strategies the client objects can access the server objects efficiently in a dynamically changing environment. We do not only consider the dynamic changes of the network characteristics but also consider the end-hosts performances before changing to the optimal strategy. Therefore the client objects can achieve the maximum usefulness of the environment. Here, we introduce three access strategies, namely client migration, direct access, and lazy access to impart an adaptive behavior to the client objects in the distributed environment. Advancing from the conventional static access models we propose algorithms to select the best-suited access strategy for the dynamic environment. Moreover the proposed model is to be implemented to the "juice" distributed object-oriented environment.