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A Study of Advanced N-Tier Model for Improving Maintainability of Web Applications in Cloud Environment  

Kim, In-Kyu (Dept. of Management Information System, Kookmin University)
Shin, Joon-Chul (Dept. of Management Information System, Kookmin University)
Publication Information
Journal of Information Technology and Architecture / v.10, no.4, 2013 , pp. 537-552 More about this Journal
Abstract
Software-as-a-Service (SaaS) has led to paradigm shifts in the information management area by combining it with SOA and Mashup. System developers now have more chances to access various high-quality functions through API opened on the web. But external resources are controlled by service providers so that it raises the component's uncertainty in system management which is related to external resources. In the cloud environment, components related to external resources causes negative effects on system's maintainability by making them dependant on service providers. This study proposes a way to enhance maintainability by using stable external resources. For this work, we suggest the N+1-tier model in which an external resource tier is added to the N-tier model. After that, we analyze how adding an external resource tier affects the decreasing complexity of maintainability and improving maintainability on web application.
Keywords
cloud computing; Software as a service; layered architecture; mash up; software maintainability; software quality;
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