期刊名称：Software Engineering : an International Journal
电子版ISSN：2249-9342
出版年度：2013
卷号：3
期号：1
页码：7-20
出版社：Delhi Technological Universiity
摘要：Most web services today are made up of dynamic entities, and because of these entities the services may need to evolve and adapt to their environment over time. This adaptation, by the web services, can occur at any of the service contract levels. In addition, the requirements of the client may change over time based upon their needs and wants. Because of this, the service composition process needs to also be adaptable and dynamic while taking into account the multi- level agreements present within distributed system. This composition process is required when a client has specified requirements that a single service may not completely satisfy but instead may require many services to meet their given needs. Through the creation of a proxy service these needs can then be composed and presented to the client as if they were working within a single service. Additionally, as both service and client requests change or are altered over time the composer also may need to adjust this proxy service to meet both sets of needs. In this paper, we propose a design of an adaptive service composer that will provide a focus on automatic adaptation of semantic and quality of service (QoS) level contracts in compositions. This proposed implementation will then be empirically validated on the existing Enhanced Distributed Object Tracking System (eDOTS).
