Web services wsdl
- 1. Web Services Using WSDL
- 2. WSDL • Web Service Definition Language • Predecessors include – COM, CORBA IDLs – Network Accessible Service Specification Language (IBM) – SOAP Contract Language (Microsoft) – First submitted to W3C in Sep 2000 – Current version is 1.1
- 3. WSDL • Define a web service in WSDL by – Writing an XML document conforming to the WSDL specs • Describes three fundamental properties – What a service does • Operations (methods) provided by the service – How a service is accessed • Data format and protocol details – Where a service is located • Address (URL) details
- 4. WSDL Components types message portType binding service All the data types used by the Web service Parameters and messages used by method port Abstract interface definition – each operation element defines a method signatureoperation Binds abstract methods to specific protocols A service is a collection of ports. A port is a specific method and its URI definitions
- 5. Sample WSDL: getQuote <?xml version="1.0" encoding="UTF-8" ?> <definitions name="net.xmethods.services.stockquote.StockQuote" targetNamespace="http://www.themindelectric.com/wsdl/net.xmethods.services.stockquo te.StockQuote/" xmlns:tns="http://www.themindelectric.com/wsdl/net.xmethods.services.stockquote.Sto ckQuote/" xmlns:electric="http://www.themindelectric.com/" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns="http://schemas.xmlsoap.org/wsdl/"> <message name="getQuoteResponse1"> <part name="Result" type="xsd:float" /> </message> <message name="getQuoteRequest1"> <part name="symbol" type="xsd:string" /> </message>
- 6. Sample WSDL: getQuote <portType name="net.xmethods.services.stockquote.StockQuotePortType"> <operation name="getQuote" parameterOrder="symbol"> <input message="tns:getQuoteRequest1" /> <output message="tns:getQuoteResponse1" /> </operation> </portType> <binding name="net.xmethods.services.stockquote.StockQuoteBinding“ type="tns:net.xmethods.services.stockquote.StockQuotePortType"> <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http" /> <operation name="getQuote"> <soap:operation soapAction="urn:xmethods-delayed-quotes#getQuote" /> <input> <soap:body use="encoded" namespace="urn:xmethods-delayed-quotes" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" /> </input> <output> <soap:body use="encoded" namespace="urn:xmethods-delayed-quotes" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" /> </output> </operation> </binding>
- 7. Sample WSDL: getQuote <service name="net.xmethods.services.stockquote.StockQuoteService"> <documentation>net.xmethods.services.stockquote.StockQuote web service </documentation> <port name="net.xmethods.services.stockquote.StockQuotePort" binding="tns:net.xmethods.services.stockquote.StockQuoteBinding"> <soap:address location="http://64.39.29.211:9090/soap" /> </port> </service> </definitions>
- 8. WSDL to Code • Translators available that can – Convert WSDL document to code • IBM’s WSTK Toolkit • Apache AXIS WSDL2java program • Soapy.py in Python • Not perfect – Derive WSDL from Java classes • Apache WSDL program • Much work remains to be done