Mobile Agent Model for Flexible Distributed Systems.

灵活分布式系统的移动代理模型。

• 批准号: 14580457
• 负责人: TAKIZAWA Makoto
• 金额: $ 2.24万
• 依托单位: Tokyo Denki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14580457/
• 关键词: Mobile Agent; Peer-to-Peer(P2P) System; Transactional agent; Fault Tolerant; Quality of Service (QoS); Distributed System; Database System; Client; Server System; 交渉プロトコル; 自律性; やわらかい分散システム; 競合演算; Mobile Agent; Peer-to-Peer(P2P) System; Transactional agent; Fault Tolerant; Quality of Service (QoS); Distributed System; Database System; Client; Server System; 交渉プロトコル; 自律性; やわらかい分散システム; 競合演算

In traditional client-server applications, application programs and objects are distributed into clients and servers, respectively. On the other hand, every computer named servant is peer which can have programs and objects in peer-to-peer (P2P) systems. In addition, huge number and various types of computers are interconnected in networks, ranging from high-performance, high-reliable computers like database servers to less-reliable personal computers and mobile stations. It is critical to discuss how to develop and execute reliable applications on databases in P2P systems. In database applications, transactions manipulate objects so as to satisfy ACID (atomicity, consistency, isolation, and durability) properties. In traditional database systems, objects are locked or transactions are timestamped to serialize multiple transactions. If objects in multiple computers are manipulated, the atomic manipulation of multiple computers has to be supported in the two-phase commitment (2PC) proto … More col.In this research, we discussed a novel type of agent model, transactional agent model to manipulate objects in multiple computers with types of commitment constraints. A transactional agent is defined to be a mobile agent which moves around computers and locally manipulates objects in one or more than one computer with type of commitment constraint. In addition, an agent negotiates with another agent if the agents manipulate a same object in a conflicting manner. Through the negotiation, each agent autonomously makes a decision on whether the agent holds or releases the objects. A transactional agent autonomously finds another destination computer if a computer where the agent to move is faulty. In this research, we discussed how to implement transactional agents in Java Aglets and Oracle database systems. We showed the evaluation of the mobile agent-based transaction systems for applications. If Aglets classes are a priori loaded, the transactional agents can manipulate object servers more shortly than the traditional client-server model. Less

在传统的客户服务器应用程序中，应用程序和对象分别分别分配给客户和服务器。另一方面，每个名为仆人的计算机都是对等，可以在对等系统中具有程序和对象。此外，在网络中将大量和各种类型的计算机互连，从高性能，高可靠的计算机（如数据库服务器）到不可靠的个人计算机和移动站。讨论如何在P2P系统中的数据库上开发和执行可靠的应用程序至关重要。在数据库应用中，交易操纵对象，以满足酸（原子，一致性，隔离和耐用性）的性能。在传统的数据库系统中，对象被锁定或交易被时间戳以序列化多个交易。如果操纵了多台计算机中的对象，则必须在两相承诺（2pc）Proto中支持多台计算机的原子操纵……在这项研究中，我们讨论了一种新型的代理模型，交易代理模型，以在多个计算机中使用承诺约束来操纵对象。交易代理被定义为一种移动代理，它围绕计算机移动并在本地操纵一台或一台计算机中具有承诺约束类型的对象。此外，如果代理商以冲突的方式操纵相同的对象，则代理商会与其他代理商进行谈判。通过谈判，每个代理人自主就代理人是否持有或释放对象做出决定。事务代理自动查找另一个目的地计算机，如果要移动的代理是错误的。在这项研究中，我们讨论了如何在Java Aglet和Oracle数据库系统中实施交易代理。我们展示了针对应用程序的基于移动代理的交易系统的评估。如果AGLETS类是先验加载的，则交易代理可以比传统的客户端服务器模型更快地操纵对象服务器。较少的