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Enterprise Service Computing From Concept to Deployment_14

Các chủ đề bao gồm từ khái niệm phát triển, thiết kế hệ thống, mô hình hóa, và công nghệ phát triển, việc triển khai cuối cùng, cung cấp các kết quả nghiên cứu cả lý thuyết và ứng dụng thực tế cho các doanh nghiệp đang phát triển. | 402 Maamar currently under execution vs. the maximum number of Web services under execution and b the next period of unavailability. After a positive check of the W-context the identification of a resource is now launched. In ConPWS we assume the existence of a mechanism supporting the identification of resources. A resource mainly needs to accommodate two things a the beginning time of a Web-service execution and b the time that the execution of a Web service lasts since the outcome of this execution depends on the delivery time as per user indication. To this purpose a resource checks its R-context with regard to a the next periods of time that will feature the execution of Web services and b the next period of maintenance. After a positive check the resource notifies the Web service about its availability to support this service execution. Before the personalized Web service notifies the user about the handling of his or her time and location preferences an extra personalization process is triggered. This consists of adjusting the Web services that are linked through the causal relationship to the personalized Web service. The description given in the previous paragraphs also applies to the extra Web services which assess their current status through their respective W-contexts and search for the resources on which they will operate. To keep Figure 7 clean the interactions that the new personalized Web services undertake to search for the resources are not represented. Once all the Web services are personalized a final notification is sent out to the user about the deployment of the Web service that he or she has requested. Policies in ConPWS Because of user preferences and resource availabilities a Web service is adjusted so that it accommodates these preferences and deals with these availabilities. To ensure that the adjustment of a Web service is efficient ConPWS integrates three types of policies owners of Web services are normally responsible for developing