面象服務的體系架構(ppt25頁)(編輯修改稿)
2025-03-27 01:52 本頁面
【文章內容簡介】 choreographed to implement a business process . each step or activity in a business process is implemented by a service ? The business process itself bees a service ? Service choreography is described by the Business Process Execution Language (BPEL) A standard proposed to OASIS for process definition ? Service Choreography provides: Processes that bine applications and people Transactionality and pensation Manipulation of process data 13 服務的發(fā)現(xiàn) ? A Service Registry or Directory Publishes service descriptions Finds business, services and service interfaces UDDI is a standard for a registry web service (see ) ? Service discovery may be at design time or run time WebSphere Studio provides Web Services Explorer to publish and search UDDI UDDI Service entries contain URL of its WSDL ? A UDDI directory may be private to an enterprise ? WSDL for services may be stored in local files and directories ? ESB mediations may be used to determine service’s location at run time Service Registry 14 SOA 的服務棧 ? SOA uses Web Services specifications to implement its features ? Many Web Services specifications are being standardized ? IBM and other vendors have implemented these specifications, anticipating the standards ? The Web Service function stack is rich and getting richer 15 如何構建 SOA的系統(tǒng) ? Develop a service oriented mentality Everything is a service ? Understand and define services Good service deposition is the challenge Remember coarse granularity Some service implementations will exist, others will need to be created ? Determine service interfaces and interaction patterns What formats will be adopted for data exchange? What qualities of service will bound interactions? Where will mediation be required/appropriate? ? Define service orchestrations in terms of supported business processes Composite services will generally reflect business processes? What are the business processes? Business models in WebSphere BI Modeler can prove invaluable here 16 采用 SOA 的
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