Research on Multi-tier Distributed Systems Based on AOP and Web Services

Web services are the best way to solve cross-platform, cross-language, loosely coupled distributed systems in Web environment at present. But because of some crosscutting concerns such as logging, authorization, transaction, etc. in web services, the systems which are constructed by integrating web services have some problems caused by the code-tangling, code-scattering: the adaptability and reuse of web services are decreased; the systems are difficult to be maintained and extended. In order to solve the above problems, aspect-oriented programming (AOP) is introduced to web services, the crosscutting concerns are separated and realized individually as aspectual services and a weaver weaves them when the system runs. And after researching service-oriented architecture (SOA) and multi-tier architecture, a system architecture based on aspectual services and web services is proposed.