The Design And Implementation Of Meridian Project Data Distribution System

This paper focused on the design and implementation of Meridian Project data distribution system.First of all, this paper introduced the background of this system. Meridian Project is a large-scale space environment monitoring system. It is divided into three parts: data and communication system, space environment monitoring system and researching and forecasting system. The data service subsystem included in the data and communication system is also divided into three parts: data sharing system, data distribution system and data product processing system. This paper focused on the data distribution system.In the Meridian project data distribution system a data distribution software package is needed in order to allow some special users to subscribe data file which they want. The system also needs a distribution monitor software package to monitor the state of distribution. In addition, the system should provide query service for users who want certain data files.In this paper, we introduced some technologies and tools used in this project, for example, three open source frameworks JSF, Spring and Hibernate which is used in data sharing web-site. The PostgreSQL was used in this project as a database. Quartz technology was used in data distribute system to develop work scheduling system.In this paper, we discussed the requirement of the data distribution system. we divided the system into six functions: login management, data product query, data product subscription, data product distribution, data distribute monitoring and system management. Every function had use case diagram and sequence chart.In the system overall design, we discussed the software and hardware environment, net structure, design of database and design of system framework. The system framework structure was divided into six layers, they were domain layer, data access object layer, business logic layer, WEB-MVC layer, WebService layer and security layer.Finally, we used the code and picture in the project to discuss the design and implementation of these three core parts, which were general query, static query and data distribution software.