ADAPTIVE QUALITY LEVEL SELECTION METHOD FOR EFFICIENT QUALITY-OF-SERVICE BASED SERVICE COMPOSITION AND SYSTEM THEREOF

摘要

PURPOSE: A constraint distribution method and a system thereof for an efficient service composition based on quality of service (QoS) are provided to improve the success rate and optimality of service composition by estimating a constraint which is allocated to each service class unit and by intensively performing sampling on a quality attribute section of a constraint. CONSTITUTION: A composition unit (402) distributes constraints which are allocated to service classes (401) for a service class unit and quality levels which are dynamically selected according to the number of candidate services that configure the service classes among local constraints of the service classes. The composition unit calculates predictive quality by using the quality attributes of the service classes, the number of the candidate services, and the number of the constraints. The composition unit divides the quality attributes according to the predictive quality in the service classes, and selects the quality levels. [Reference numerals] (400) Service composition system based on QoS; (401) Service class; (402) Composition unit