基于反射中间件的服务定制

Enabling Service Customization in Reflective Middleware

中间件系统处理的是复杂的分布式应用问题,不同应用往往有不同的服务质量(QoS)要求。但传统的中间件对此要么支持很少,要么将各种属性交织在一起。RECOM是采用绑定具体化反射模型的一个反射中间件,通过配置不同类型的反射层,可以实现分布式应用的服务定制,以满足性能、安全、高可用性等不同要求。文章介绍了RECOM的设计思路,着重分析了其可配置的反射层的设计及编程模型,并给出了一个例子。文章最后还将RECOM的反射层与有类似概念的CORBA的截取器进行了比较。

Middleware systems deal with complex distributed applications which require various qualities of Service(QoS),but the traditional middlewares either give little support for QoS,or tangle different properties together.RECOM is a reflective middleware based on binding-reification reflecitve model.Employing configruable reflective layers,it supports service customization of distributed applications,and meets their requirements such as performance,security,high avail-ablity,and so on.The disign method of RECOM is introduced.The implementaion and programming model of its config-urable reflective layers are elaberated,then an example is presented.At the end of this paper,RECOM's reflective layer and CORBA's interceptor which has the similar concepts are compared.