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Web Services – An Industry Approach to the evolution of Distributed Architecture Mark Johnston Academic Team, Microsoft UK

Topics help Introduction Web Services Video What's it all about Visual Studio Web Services Demo Web Services Stack Visual Studio Web App Demo The Future Quiz

The Evolution of Distributed Computing MS-BASIC Turbo Pascal QuickBasic The PC The PC Big Iron Cobol RPG Visual Basic PowerBuilder Delphi GUI Web Services The Web HTML Script

What is a Web Service? “A programmable application component accessible via standard Web protocols” ? ?

Web Services Benefits Allows for sharing of functionality across: Devices Networks Operating Systems Programming languages Built using open Internet standards XML, SOAP, UDDI, WSDL

The Potential of Web Services “ Web Services will revolutionise how we work - how we interact with each other, with companies, with websites and beyond. A world of seamlessly connected applications awaits.” Silicon.com “With Web services, it’s easy for us to build a tool that takes route information and displays it on the Web in a number of different formats, including a schematic layout that tells you not only where the bus is, but also where it has been.” Massachusetts Institute of Technology Applied Implications of Web Services “We’ve proven that the promise of XML Web services is real. You can develop a service that can be exposed across multiple media formats, and not have to write an application for each platform to render it for each medium. This has incredible implications…” GlaxoSmithKline

Online Ordering of Concert Tickets video

Internet AlertsEMIBankHomeworkReminders News providers … Service Provider Network What Just Happened?

Applications of Web Services eCommerce Online ordering, B2B Building-block services for developers Sign-in, eWallets, etc. Value-added features for client applications E.g. banking Web services for MS Money

Web Services in.NET.NET Framework designed with distributed computing in mind Web services support loosely-coupled distributed computing Creating Web services in.NET is easy! Based on open standards Cross-platform Simple to create, design and test Human readable messages

Creating Web Services in Visual Studio.NET

The Web Services Stack UDDIUDDI WSDLWSDL SOAPSOAP XMLXML TransportTransport e.g. HTTP, FTP or SMTP

XML XML is the core of Web Services Provides platform independent data interchange The format of all administrative data used by web services Verbose and Human readable Highly extensible UDDIUDDI WSDLWSDL SOAPSOAP XMLXML

XML Code snippet UDDIUDDI WSDLWSDL SOAPSOAP XMLXML The Darkness Reading

SOAP Simple Object Access Protocol The primary communications interface between Web services Language and OS independent Protocol independent Not reliant on HTTP for transfer Can be encrypted by nature of the transport method used UDDIUDDI WSDLWSDL SOAPSOAP XMLXML

SOAP Code snippet UDDIUDDI WSDLWSDL SOAPSOAP XMLXML <soap:Envelope xmlns:xsi=““ xmlns:xsd=“” xmlns:soap=“”>

WSDL Web Services Description Language Describes what services a web service can be provide Analogous to ‘reflection’ Gives a detailed “contract” for each service provided Contract specifies what interfaces are exposed UDDIUDDI WSDLWSDL SOAPSOAP XMLXML

WSDL Proxy Class Generation

UDDI Universal Description Discovery and Integration An industry-wide project to standardize the discovery of web services A data model and API specification Details on providers and their services Both XML and non-XML services Publish, Find & Bind Operations An example UDDI registry can be found at UDDIUDDI WSDLWSDL SOAPSOAP XMLXML

Web application using Web Services logic

The Global Web Services Architecture (GXA) SOAP HTTP/SMTPXMLTCP/IP Directory Inspection The Internet Description Building Block Modules Building Block Modules Inter Application Protocols Referral Routing Security License Eventing… Reliable Messaging … …

Applications of GXA Suitable for secure of high-performance architectures Used for Grid Computing Super Computing Outsourcing Internet-scale DataGrid GXA is aligning with OGSA (Open Grid Services Architecture) Co-evolution of MS GXA and GGF OGSA

Summary Industry is widely adopting and supporting Web services Not just a Microsoft initiative XML Web services provide open, Internet- native integration Fundamental shift: distributed computing for the Internet Visual Studio.NET makes creating powerful Web service-driven applications simple

Further Resources Web Services Developer Community msdn.microsoft.com Inspiration Tour Site