web services In this presentation

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web services • In this presentation… – – – what is a web service? web service benefits web service standards web service definitions web service actions

web services • what is a web service? – programmable logic accessed using standard web protocols – platform independent remote program calls – builds on commonly used standards

web services • web service benefits – – vendor independent platform independent flexible transport standards based

web services • web service standards – – – UDDI – Universal Description, Discovery and Integration WSDL – Web Services Description Language SOAP – Simple Object Access Protocol XML – e. Xtensible Markup Language HTTP – Hypertext Transfer Protocol

web services • UDDI – standard for registering web services – public or private registries – service and WSDL definitions listed

web services • UDDI – two major public registries • http: //uddi. microsoft. com • http: //www-3. ibm. com/services/uddi

web services • WSDL – describes • • service name operations arguments return types custom types text description encoding transport

web services • SOAP – XML structure for passing requests and replies – Messages for each operation

web services • XML – meta-language (a language to define other languages) – human readable (sometimes) – SOAP defines the way XML is used in web services

web services • HTTP – – ubiquitous firewall friendly simple web services can use other transports

web services • centric web services prerequisites – Microsoft SOAP Toolkit V 3. 0 – Web access

web services • web services actions – Web. Declare – Web. Description – Web. Call

web services • Web Services Description tool – simple view

web services • Web Services Description tool – advanced view

web services • Web. Description – uses WSDL to define a web service – high level and simpler – implementation details derived from WSDL

web services • Web. Description – Arguments • WSDL • Procedure • Alias

web services • Web. Description (http: //www. richsolutions. com/Rich. Payments/Rich. Card. Validato r. asmx? WSDL, Get. Card. Type, )

web services • Web. Declare – Low level definition of web service – WSDL not available – Uses structures in arguments or return value

web services • Web. Declare – Arguments • • URL Soap. Action Procedure Namespace Alias Arguments Returns

web services • Web. Declare (http: //www. ebob 42. com/cgibin/Romulan. exe/soap/IRoman, urn: Roman-IRoman#Int. To. Roman, Int As Integer, return As String)

web services • Web. Call – execute the web service – must be defined earlier with Web. Declare or Web. Description – Handles encoding of arguments and response

web services • Web. Call – Arguments • Procedure • Arguments • Returns – Web. Call (Get. Card. Type, fld. Card. Number, str. Card. Type)

centric 8 Training • Workshop 3

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