Onceaoc is designed . the container can be capable of adapting their behavior to the changing environments though dynamically weaving multiple aspects at run - time . process - collocation and host - collocation is supported to improve the performance of communication in onceaoc . to improve the dependability and scalability of wass , a middleware - based adaptive load balancing service is designed 针对w亡b应用服务器负载平衡服务的特殊需求，论文设计了一种基于中间件的自适应负载平衡服务，阐述实现该服务的若干关键技术及其解决办法，包括可热插拔、负载策略可替换、负载反馈与自适应控制、状态迁移以及容错技术等。
In the internet - based web computation , the traditional middleware technologies are challenged by the problems of high concurrency , distributed transaction , and integration of middleware and legacy systems . web application server is put forward to solve those problems . a web application server is a distributed system that provides runtime - integrated services such as naming service , security service , transaction management , load balancing , fault tolerance etc , for transactional web application 在面向internet的web计算环境下，传统的中间件技术面临着高并发度、分布式事务、中间件与遗留系统的集成等问题，由此， web应用服务器应运而生，它为开发、部署、运行、集成、维护和管理中间层应用服务提供一个通用运行环境，用户只需关心中间层应用服务的业务逻辑，而中间层应用服务的名字解析、路由选择、负载平衡、事务控制、失效恢复、状态迁移、升级扩展等功能则都由web应用服务器提供。
