A data repository for fine-grained adaptation in heterogeneous environments
Proceedings of the 3rd ACM international workshop on Data engineering for wireless and mobile access
A multi-version data model and semantic-based transaction processing protocol
ADBIS'05 Proceedings of the 9th East European conference on Advances in Databases and Information Systems
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Most existing distributed file systems (DFS) implement a single consistency model to maintain one-copy equivalence. The functionality of that consistency model is based on a balance between environmental constraints and the targeted level of consistency. Such systems efficiently maintain consistency while the environmental capabilities remain constant, for example, presuming uninterrupted connectivity. However, when these characteristics change, the inflexible nature of a single consistency model results in its inability to maintain an expected balance between consistency and constraints. GLOMAR is a DFS middleware layer that allows application developers to map their specific consistency models to environmental constraints. As a result, multiple consistency models can be created, with each scoped for a particular application and environmental scenario. This paper outlines important aspects of GLOMAR, detailing its implementation and outlining a consistency model implementation based on Web services and the SOAP protocol.