Research On Web Service Composition Technology

With the rapid development of IT technology and Web application, web service composition is becoming the main technology for enterprise information integration. However, there still exist several problems which hobble web service composition. Some of them are how to design the activities in the business process with the exact granularity so that they can be bound to concrete web service, how to comprehensively evaluate web service quality by using not only the general attributes but also domain specific attributes so as to select the most available web services, and how to deal with the problem that the type of the output messages of the preceding service is subtly heterogeneous with the type of the input messages of the subsequent service. This dissertation analyzes and studies these problems in web service composition. The main contributions of this dissertation are as follows.In order to control service granularity in the composition, a new business process model called Hierarchical Web Service Composition Model is proposed based on hierarchical analyzing method. This model provides the mechanism to decompose business requirements in top-down mode to generate hierarchical business activities with different functional clarities. Business activity contains both business requirement description and business execution description, also contains sub-process for dynamically describing the business logic. Business process can be generated by selecting business activities in different level. In this way, hierarchical Web Service Composition Model provides the ability to control the composition granularity effectively and reuses sub-process with business activity as a unit.In order to select web service with high quality, a domain-adaptive web service selection method is presented. This method uses ontologies to describe...