Design and Implementation of a Distributed System for Integrating Mobile Objects and Distributed Transaction

近年来，移动的对象技术（通常称为移动的代理技术）是一种新兴的分布式计算系统的开发方法。该技术的一个优点是减少远程计算机之间的通信。当不同计算机上的程序彼此远程协调时，该技术将其中一个程序迁移到另一个程序运行的计算机上，使得计算机间通信被一台计算机内的进程间通信所取代。但是，很难在同一时间将一个程序迁移到多台计算机。因此，本研究的目标是通过分布式事务技术来解决这一问题，其目标是减少计算机间的通信，自行车移动的对象技术。也就是说，分布式事务技术使得对象能够被动态地迁移到多个计算机并在多个计算机处执行，而不会失去位于不同计算机处的对象之间的一致性。此外，我们还介绍了移动的对象技术作为分布式对象的一种实现方法。也就是说，事务的原子性是定义事务操作的移动的对象的往返。设计并实现了一个集成移动的对象和分布式事务的对象代理系统。该系统不仅为分布式系统中的对象提供了位置透明性，而且还为不同计算机上的对象之间提供了重复透明性，并为应用级软件提供了远程对象的统一视图。我们用一些真实的分布式应用程序，如远程搜索，CSCW，网络管理系统，来验证该方法的实用性。

Recently, mobile object technology (often called mobile agent technology) is an emerging approach for the development of distributed computing systems. An advantage of the technology is to reduce communications between remote computers. When programs at different computers remotely coordinate with each other, the technology migrates one of the programs to the computer that the other runs at so that inter-computer communications is replaced by inter-process communication within one computer. However, it is difficult to migrate one program to multiple computers in the same time. Therefore, the goal of this research is to solve this problem by means of distributed transaction technique, whose goal is to reduce inter-computer communication, bike mobile object technique. That is, the distributed transaction technique enables an object to be dynamically migrated to and executed at multiple computers without losing consistency between objects located at different computers. Moreover, we introduce mobile object technique as an implementation approach for distributed object. That is, the atomicity of a transaction is a round-trip of the mobile object that defines transaction operations. We designed and implemented an object broker system for integrating mobile objects and distributed transaction. The system provides not only location-transparency for objects in a distributed system but also duplication-transparency between objects on different computers and provides a unified view for remote objects to application-level software. We evaluated the approach with some real distributed applications, such as remote search, CSCW, and network management system, to demonstrate the utility of the approach.