Distributed File System Based On Web Service

Web Service based distributed file service system, which is based on Web, XML, and SOAP and built on hierarchical cache management, distributed mass-storage data management, access control, has a good extensibility, flexibility, reliability and security on the management system of enterprise's mass file date. This dissertation mainly introduces the key technology and innovative research of WS-DFS, such as web-based architecture, flexible component model, distributed local file storage unit, parallel access control and high efficiently organize and index for huge amount data.In the 1st chapter, we firstly introduce the origin development and future of distribute file service system, then point out that WS-DFS is a kind of application platform for process and management huge amount file data,a kind of developing platform for flexible information system and a kind of application system integration framework. After introducing and comparing some typical DPS products, we put forward to a ideal DPS model and enumerate some detail rules of DPS design.In the 2nd chapter, we discuss the architecture of our system. After analyzing the features of several famous DPS products, we bring forward WS-DFS system function model and architecture. After modularizing current system, we come to the distribution of system. In order to improve the system's expansibility, the modules in the system communicate through XML format information data, which can solve the bad expansibility and lack of support for Web Application in the current system.In the 3rd chapter, we discuss the design of the component in the distribute file service system, and work out the models of components. Then we define some conceptions of the models and select XML as our interface definition language, which can benefit to the interaction and integration of system.In the 4th chapter, we discuss the problems in the implement of the web service based distributed file service system. It focuses on four problems: the design of central control unit, the policy of mass storage in local file service unit, the parallel access control algorithm and hierarchical cache management mechanism.In the 5th chapter, we describe the design of an instance of the web service based distribute file service system. Also we list the performance analysis of the system.In the end,all of the works in this dissertation are summed up, and their futures are prospected.