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This paper envisions service-oriented applications in cloud computing environments. A service-oriented application consists of a set of services and a workflow. Each service encapsulates the function of an application component. Each workflow defines how services interact with each other. When an application is uploaded to a cloud, the cloud deploys each service in the application as one or more service instances. Each service instance runs on a process or a thread and operates based on a particular deployment plan; different service instances operate at different Quality of Service (QoS) levels. For example, Amazon Elastic Compute Cloud (EC2) offers five different deployment plans that allow service instances to yield different QoS levels by providing different amounts of resources at different prices.
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