標準化是網(wǎng)路技術(shù)演進的主軸-全文預覽
【正文】 ws– Flows of services, potentially between partners– Services as wrappers for exposed business processes– Service position– This is an emerging paradigm? IBM has published WSFL? Microsoft has published XLangWeb Computing Lab (FJU CSIE)Definition of Stack Layers? Quality of Service– Network Level: reliable messaging– Service Description Level:? Implementation level Ex. Transactional, secure? Interface level Ex. Tolerable response times? Provided by WSDL and potentially other definitions (potentially based on ebXML Partner Agreements type of information)– Publication/Discovery: highly available UDDI nodeWeb Computing Lab (FJU CSIE)Definition of Stack Layers? Management– Means:? Information: Identification, Configuration? Metrics: Performance? Control: Operations, Configuration– By Management System for:? Web Services Infrastructure? Each enterprise responsible for managing own infrastructure? Enterprises will need to expose management interfaces for use by business partners: status, query, cancelWeb Computing Lab (FJU CSIE)Definition of Stack Layers? Security– Requirements:? Confidentiality? Authorization? Data Integrity? Proof of Origin? NonRepudiation– Secure transport is not enough:? End to End promised by intermediaries? Middleware independence? Transport independence? Asynchronous multi hop messagesWeb Computing Lab (FJU CSIE)Definition of Stack Layers? Security– Network? HTTPS, SSL, current work technologies– XML Messaging? Basic Auth in SOAP header? XML Digital Signature? Support trusted thirdparty authentication– Service Description? Security capabilities and requirements– Publication/Discovery? Trusted registry, trusted access (same issues)Web Computing Lab (FJU CSIE)值得關(guān)注的後續(xù)發(fā)展主題? Security – standards and JSRs? Reliable Messaging – exactly once delivery? Enabling services – infrastructure turned services? Quality of Service – living up to expectationWeb Computing Lab (FJU CSIE)Integration? System logic redesignResourceSystemLogicgetTime()getName()PresentationHTMLJSPASPApplicationPresentation SystemLogicResourcePresentation SystemLogic ResourcePresentation SystemLogic ResourceWebServicesWeb Computing Lab (FJU CSIE)Integration (Cont.)? IntegrationTech DataTech DataCompany ACompany BEmployeeEmployeeWeb ServicesWeb Computing Lab (FJU CSIE)Web Services Description Language? An XML vocabulary? Describes the interfaces for web services and how to invoke the services? Service Implementation– Implementation of one or more service interfaces– Contains the endpoint reference? Service Interface– Abstract, reusable service definition– Represents a type of service that can be implementedWeb Computing Lab (FJU CSIE)Web Services Description LanguageServiceImplementationDefinitionServiceInterfaceDefinitionServicePortBindingPortTypeTypeMessageAB1234Web Computing Lab (FJU CSIE)Web Services Description LanguageNotation Component UsageA Service 服務名稱B Port 服務位置1 Binding 服務物件定義2 Port Type 服務集合定義3 Message 服務 I/O結(jié)構(gòu)定義4 Type I/O型別定義Web Computing Lab (FJU CSIE)Web Services Description LanguageABWeb Computing Lab (FJU CSIE)Web Services Description Languagedefinitions name=“ChtSMSbinding” … … … … message name=“sendMessageRequest” part name=“calleePhoneStr” type=“xsd:string”/ part name=“messageStr”
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