An Itinerary-driven Mobile Agent Approachto the Delivery of Distributed OSGi Services
| Autor: | Hsi-Min Chen, 陳錫民 |
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| Rok vydání: | 2010 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 In recent years, as more and more Information Appliances devices embedded with intelligent software have become part of daily life, OSGi (Open Services Gateway initiative), an open service-oriented framework, has gained increasing attention in the development of services for such devices. However, services residing in an OSGi platform are devised specifically for the platform’s local bundles. Although several work have enhanced OSGi with various communication mechanisms that enable remote service invocations, two crucial issues specific to mobile computing remain to be addressed: 1) the limited resources of mobile devices, and 2) the unstable links experienced by mobile devices. To address these two issues, we propose an itinerary-driven mobile agent approach, including 1) to implement mobile agents as OSGi bundles to deliver distributed OSGi services with lower resource consumption for mobile devices; 2) to extend WSDL and BPEL to help developers design mobile agent itineraries; 3) to provide an opportunistic service matchmaking mechanism that allows mobile agents to adapt to context changes at runtime; and 4) to devise asynchronous communication mechanism to enable reliable mobile agent transmissions among OSGi-based mobile devices with only dynamic IP addresses and intermittent connection to the Internet. Empirical evaluations are also conducted, and the results show that the performance of our approach is superior to that of centralized client-server approaches with respect to network traffic, turnaround time, and memory usage. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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