Coordination Services for Distributed Applications

为了将设计人员从复杂的分布式系统中隔离出来，需要适当的中间件抽象。 人们已经认识到，这些抽象必须是灵活的和可定制的，以适应广泛的应用需求。 虽然已经提出了许多可定制的框架，但缺乏一个通用的框架，可以用来实现分布式应用程序的不同同步相关的需求。 建议项目的目标是设计一个协调服务，提供一个基本的基础设施，实现同步。 将设计一个协调服务，它接受来自应用程序的同步规范，并与应用程序实体交互，以只允许规范允许的那些执行序列。 将探索使用事件通知技术来实现协调服务。 将标识要添加以将事件通知服务转换为协调服务的新同步元素。 该研究将侧重于开发一个可扩展的，容错的和可定制的协调服务。 一个关键的挑战将是在不牺牲事件通知机制的可伸缩性的情况下适应同步。 将评估协调服务向其他中间件服务提供服务的有效性。

To isolate a designer from the complexity of a distributed system, there is a need for appropriate middleware abstractions. It has been recognized that these abstractions must be flexible and customizable to accommodate the wide ranging application requirements. Although many customizable frameworks have been proposed, a general framework that can be used to implement different synchronization-related requirements of a distributed application is lacking. The goal of the proposed project is to design a coordination service that provides a basic infrastructure to implement synchronization. A coordination service will be designed that accepts a synchronization specification from an application and interact with the application entities to allow only those execution sequences permitted by the specification. The used of event-notification technology will be explored to implement the coordination service. New synchronization elements to be added to convert an event-notification service into a coordination service will be identified. The research will focus on developing a scalable, fault-tolerant and customizable coordination service. A critical challenge will be to accommodate synchronization without sacrificing the scalability of the event-notification mechanism. The effectiveness of the coordination service in providing services to other middleware services will be evaluated.