格網環境下以Portlet和虛擬檔案系統之異質資源整合

本研究目的是為了針對格網環境下異質平台系統的資源整合上會遇到的問題提出一個可行的解決方案。本研究提出採用邏輯性的虛擬檔案系統這些異質系統都有本身就提供的存取機制，因此利用這樣的特性直接採用各平台本身的機制來存取。過去經常會開發新的通訊協定來解決這樣的問題，但是這種方式也帶來需要重新導入新系統的問題。如果為了導入格網環境而需要去重新建置或是異動系統內的配置設定，這將會帶來龐大的建置成本及影響現有系統運作的穩定性。因此提出採用虛擬檔案系統（Virtual File System, VFS）的模式作為一個抽象層來整合異質系統上的原有存取機制，並且提供統一的存取介面。如此可以在不影響既有系統的架構及運作，且可以達到對異質系統進行檔案的存取能力。為了解決跨平台的操作問題，因此採用Web的普遍性及跨越平台的特性，採用以Apache Jetspeed作為本研究在進行存取檔案資源的整合操作平台。本研究中的虛擬檔案系統採用Apache Commons專案下的VFS程式庫來進行虛擬檔案系統的平台實作開發。除了Apache Commons VFS本身提供一個抽象層作為虛擬的檔案系統控制介面外，其開放自由的授權更能避免專利的限制，有助於往後發展時的擴展性。本研究以行動數位學習格網作為實例應用標的來實驗本研究的可行性。因此針對學習資源能夠跨異質系統地進行存取後，各種不同的學習資源也就更進一步可以予以整合。如此的架構可以跨越數個學習管理系統以及學習資源，提供真正一貫化的學習管理。學習教材提供者將專注於教材的設計，內容的使用者也只需透過這樣的存取架構可以將學習教材資源加以整合。因此這樣的架構將有效解決學習資源的異質來源存取問題，直接且即時無障礙地操作使用教材資源。

關鍵字

Portal ； Portlet ；資料格網；格網技術；虛擬檔案系統； VFS

並列摘要

The objective of this study is to propose a feasible solution which shall resolve the problems that may be encountered when running Grid computing on heterogeneous platform. There is a way to solve the problem by developing a new system and common protocol that can used for heterogeneous platform. However, it would be very costly and affect the stability of existing system. Therefore, providing a single interface that facilitates Virtual File System （VFS）technology can be used as an abstract layer to integrate the existing data accessing mechanism on heterogeneous platform. Not only it will not affect the operation of existing system, but also it will achieve the objective of providing data access on heterogeneous platform. In order to make the operation easier, Apache Jetspeed is selected for running this research, since it is Web based interface and compliant with Portlet standards. In addition, this study is using the software components inside VFS of Apache Commons to develop such a platform. The benefits of using VFS are, one it can be used as an abstract layer for controlling files and it is open sourced. In order to understand the feasibility of this research, it is taking Mobile Learning Grid as a real experiment application. It will achieve the integration objective of providing Learning-Data accessed on heterogeneous platform. The Author can focus on teaching material. The Consumer of teaching material just access on this platform to integrate. Hopefully, this research to resolve data access on heterogeneous platform and freedom to use teaching material.

並列關鍵字

Virtual File System ； VFS ； Portlet ； Data Grid ； Grid Technology ； Portal

參考文獻

[1] W. Allcock, J. Bresnahan, R. Kettimuthu and J. Link, “The Globus eXtensible Input/Output System (XIO): A Protocol Independent IO System for the Grid,” Proc.19th IEEE Int’l Parallel and Distributed Processing Symposium (IPDPS'05), pp. 179a, 2005.

[6] I. Foster, “Globus Toolkit Version 4: Software for Service-Oriented Systems,” J. Computer Science and Technology, Springer Boston, vol. 21, no. 4, July 2006, pp. 513–520.

[8] C.-J. Liao and F.-C. OuYang, “A Workflow Framework for Pervasive Learning Objects Composition by Employing Grid Services Flow Language,” Proc. 4th IEEE Int’l Conf. on Advanced Learning Technologies (ICALT'04), 2004, pp. 840-841.

[10] C.-J. Liao and J.-T. Yang, “A SCORM-compliant Ubi-learning Grid by Employing CC/PP,” Proc. 5th IEEE Int’l Conf. on Advanced Learning Technologies (ICALT'05), 2005, pp. 66-68.

[15] RFT, Reliable File Transfer Service; http://www.globus.org/toolkit/docs/development/4.1.0/data/rft/index.html. 2007.

國際替代計量

格網環境下以Portlet和虛擬檔案系統之異質資源整合

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