Semantic Multi-granular Lock model for Object Oriented Distributed Systems

Abstract

Abstract-In object oriented distributed systems (OODS), the objects are viewed as resources. Concurrency control techniques are usually applied on the database tier. This has the limitations of lack of support of legacy files and requirement of separate concurrency control mechanis ms for each database model. Hence concurrency control on the objects at server tier is explo red. To imp lement concurrency control on the objects participating in a system, the impact of method types, properties and class relationships namely inheritance, association and aggregation are to be analyzed. In this paper, the types and properties of classes and attributes are analysed. The semantics of the class relationships are analysed to ascertain their lock modes, granule sizes for defining concurrency control in OODS. It is also intended to propose compatibility matrix among all these object relationships.

Error Detection in a Multi-user Request System Using Enhanced CRC Algorithm

“…This type of system is often used on mainframes and similar machines, and if the system fails it can affect dozens or even hundreds of users connected to the system for services. This is also true for object oriented distributed systems (OODS), were the objects are viewed as resources and concurrency control techniques are usually applied on the database tier [14]. A multi-user request system allows multiple users to access the data and processes of a single machine from different computers or terminals.…”