Realizing a Adaptable Distributed Object-Oriented Computing Environment by Using Reconfigurable Object

利用可重构对象实现自适应分布式面向对象计算环境

• 批准号: 15500045
• 负责人: YOSHIDA Takaichi
• 金额: $ 1.86万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15500045/
• 关键词: adaptability; self reconfiguration; open distributed computing; object-oriented computing; reliability; fault tolerance; quorum consensus; meta-object; 自己再構成可能性; 信頼性; オブジェクト指向計算; メッセージ順序制御; 生成通信; ソースコード変換; 分散計算

In large scale open distributed computing environments, runtime environments, such as performance and reliability, are continuously changing. If a user wants the system to preserve some level of performance and reliability in spite of change of runtime environments, the system should adapt itself to change of runtime environments. These changes are not predictable in the life time of systems or applications.In this research, we proposed a reconfigurable object that can reconfigure itself according to change of the runtime environment. The reconfigurable object consists of some functional meta-objects as well as a user defined meta-object. When the reconfigurable object detects a change of runtime environment, it exchanges some functional meta-objects to another one to adapt itself to the change. To make it easy for a reconfigurable object to exchange its meta-objects, we adopted loosely-coupled communication between meta-objects. Thus the distributed system that is composed of the reconfigurable objects has an ability to adapt to its runtime environment.We confirmed that our ideas can be realized by implementing the proto-type of reconfigurable objects and an environment change detection mechanism. Moreover, we showed following four application areas of the system. The first one is adaptable fault tolerance, which adapts the system to change of the underlying system's reliability and user required level of reliability. The second one is adaptable remote access, which solves the trade-off between cost and quality of data on accessing remote data, according to change of system performance. The third one is a quorum reconfiguration on the occasion of change of mutual exclusion group members. The last one is adaptable message ordering protocols, which selects the cost effective protocols even if system performance changes. Through these examples, we confirmed that reconfigurable objects are useful to realize a cost effective, robust and reliable distributed system.

在大规模开放分布式计算环境中，运行环境，如性能和可靠性，是不断变化的。如果用户希望系统在运行时环境发生变化的情况下仍保持一定的性能和可靠性，则系统应自适应运行时环境的变化。这些变化在系统或应用程序的生命周期中是不可预测的。在本研究中，我们提出了一种可重构对象，它可以根据运行时环境的变化来重新配置自己。可重构对象由一些功能元对象和一个用户自定义元对象组成。当可重构对象检测到运行时环境的变化时，它将一些功能元对象转换为另一个功能元对象以适应变化。为了方便可重构对象之间的元对象交换，我们采用了元对象之间的松耦合通信。通过实现可重构对象的原型和环境变化检测机制，证实了我们的思想可以实现。此外，我们展示了该系统的以下四个应用领域。第一个是自适应容错，它使系统适应底层系统的可靠性和用户所需的可靠性水平的变化。第二种是自适应远程访问，它解决了根据系统性能的变化，在访问远程数据时在数据质量和成本之间进行权衡的问题。第三种是在互斥组成员发生变化时的仲裁重配置。最后一种是自适应消息排序协议，即使系统性能发生变化，它也会选择成本有效的协议。通过这些例子，我们证实了可重构对象是有用的，以实现一个成本效益，鲁棒性和可靠的分布式系统。

项目成果

A Simple, Safe Reconfigurable Object Model with Loosely-Coupled Communication

具有松耦合通信的简单、安全的可重构对象模型

• 发表时间: 2006
• 期刊: The IEEE 20th International Conference on Advanced Information Networking and Applications (AINA 2006)
• 作者: C.W.Shin;J.Y.Lee;B.C.Kim;Y.Kwon;T.Nanri;Maho Shibuya;Kentaro Oda
• 通讯作者: Kentaro Oda

Juice2 : 適用型分散オブジェクト指向環境のモデル

Juice2：自适应分布式面向对象环境的模型

• 发表时间: 2004
• 期刊: 情報処理学会九州支部 火の国情報シンポジウム2004 (CD-ROM)
• 作者: 藤原由利子;中山満子;松浦敏雄;小田謙太郎
• 通讯作者: 小田謙太郎

Juice2: Implementation of an Adaptable Distributed Object-Oriented Environment (in Japanese)

Juice2：适应性分布式面向对象环境的实现（日语）

• 发表时间: 2004
• 期刊: Information Processing Society of Japan Kyushu Chapter Hinokui Symposium 2004 (CD-ROM)
• 作者: Hiroki Najima;Kentaro Oda;Takaichi Yoshida
• 通讯作者: Takaichi Yoshida

R.Samarasinghe, Y.Yasutake, T.Kato, T.Yoshida: "Adaptable Access Strategies Provide a High Usefulness of the Objects in an Open Distributed Environment"International Conference on Advanced Information networking and Applications(AINA 2004). 18(in printing

R.Samarasinghe、Y.Yasutake、T.Kato、T.Yoshida：“自适应访问策略在开放分布式环境中提供了对象的高实用性”高级信息网络和应用国际会议（AINA 2004）。

Optimizing the Access Performance and Data Freshness of Distributed Cache Object Considering User Access Pattern

考虑用户访问模式优化分布式缓存对象的访问性能和数据新鲜度

• 发表时间: 2005
• 期刊: The International Conference on Advanced Information Networking and Applications (AINA' 2005) Vol.2
• 作者: 吉田健一;勝野聡 ほか;山本哲弘 他2名;Rohan Samarasinghe
• 通讯作者: Rohan Samarasinghe