Research Of Reconfiguration

With the evolvement of the E-commerce, Internet is undergoing substantial changes from a communication and browsing infrastructure to a medium for conducting business and selling services. These changes place the Web server at the center of the E—commerce infrastructure with increasing requirements for providing service differentiation and performance assurance. WebQoS belongs to the application level of QoS. Nowadays, WebQoS control cannot provide reconfiguration of the QoS parameters, and run short for flexibility. With the appearance of distributed processing, real-time processing, mobile computing and the change of traditional application environments, application systems have to be adaptable to frequent variations in the context of execution. As a consequence, we need more flexible and self-adaptable software. Reflective approach helps system to check and adapt its behavior.Thus, reflective middleware considered to resolve the problem becomes one of hot topics in the research on next generation middleware. But, most reflective middleware based on J2EE cannot provide QoS (Quality of Service) control, a prototype—HHRM which implements QoS control is presented. Because the reconfiguration mechanism of HHRM is the reason that it can provide QoS control, we analyze the reconfiguration mechanism of HHRM. HHRM can provide WebQoS control using reflection technology, and it make J2EE architecture stronger.