Coherence Models for Web Object-Based Systems

This paper proposes an approach to flexible object-based replication and coherence support for the Web. Our approach is based on a symmetric model of distribution, as opposed to the asymmetric client/server model. We take into account the diversity of Web objects by applying a replication and a coherence strategy on a per-object basis. We also introduce a two-level coherence model which allows replication and coherence to be based on both server knowledge and client preferences. Server-based models are applied by object developers and client-based models allow a client to specify required consistency guarantees [7]. 1 Object-based System Model for Web application