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Lecture 6 SOAP WSDL UDDI

Lecture 6 SOAP WSDL UDDI. Highlights. eXtensible Markup Language (XML) Simple Object Access Protocol (SOAP) Web Services Description Language (WSDL) Directory Services Universal Description, Discovery, and Integration (UDDI). Basic Profile (BP 1.0).

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Lecture 6 SOAP WSDL UDDI

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  1. Lecture 6 SOAP WSDL UDDI

  2. Highlights • eXtensible Markup Language (XML) • Simple Object Access Protocol (SOAP) • Web Services Description Language (WSDL) • Directory Services • Universal Description, Discovery, and Integration (UDDI) Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  3. Basic Profile (BP 1.0) • The Web Services Interoperability Organization (WS-I) has specified the following Basic Profile version 1.0: • SOAP 1.1 • HTTP 1.1 • XML 1.0 • XML Schema Parts 1 and 2 • UDDI Version 2 • WSDL 1.1 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  4. Standards for Web Services Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  5. SOAP • SOAP is acronym for Simple Object Access Protocol • SOAP is a communication protocol • SOAP is designed to communicate via Internet • SOAP can extend HTTP for XML messaging • SOAP provides data transport for Web services • SOAP can exchange complete documents or call a remote procedure • SOAP can be used for broadcasting a message • SOAP is platform and language independent • SOAP is the XML way of defining what information gets sent and how Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  6. SOAP (Simple Object Access Protocol) • Used to exchange messages via HTTP, SMTP, and SIP (Session Initiation Protocol for Internet telephony) • Originally designed for remote-procedure calls (RPC) • Works through firewalls on port 80 • Character-based, so easy to encrypt/decrypt and thus easy to secure • Inefficient due to character, not binary, data and large headers • Does not describe bidirectional or n-party interaction Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  7. Web Services: Basic Architecture Service Broker Registry; well-known Publish or announce (WSDL) Find or discover (UDDI) Service Provider Service Requestor Bind or invoke (SOAP) Not well-known Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  8. Describing a Service • Namee.g., GetTemperature • Types of Input Parameterse.g., (String, String) • Types of Output Parameterse.g., Integer Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  9. SOAP architecture • An Envelope element that identifies the XML document as a SOAP message (mandatory) • A Header element that contains header information (optional) • A Body element that contains call and response information (mandatory) • A Fault element containing errors and status information (optional) Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  10. SOAP Envelope (1) • The SOAP envelope indicates the start and the end of the message. • The SOAP envelope solves the problem of knowing when you're done receiving a message and are ready to process it. • Every SOAP message has a root Envelope element. • Envelope element is mandatory part of SOAP Message. • Every Envelope element must contain exactly one Body element. • If an Envelope contains a Header element, it must contain no more than one, and it must appear as the first child of the Envelope, before the Body.

  11. SOAP Envelope (2) • The envelope changes when SOAP versions change. • The SOAP envelope is specified using the ENV namespace prefix and the Envelope element. • The optional SOAP encoding is also specified using a namespace name and the optional encodingStyle element, which could also point to an encoding style other than the SOAP one. • A v1.1-compliant SOAP processor will generate a fault when receiving a message containing the v1.2 envelope namespace. • A v1.2- compliant SOAP processor generates a VersionMismatch fault if it receives a message that does not include the v1.2 envelope namespace. Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  12. <?xml version="1.0"?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://www.w3.org/2001/12/soap-envelope" SOAP-ENV:encodingStyle="http://www.w3.org/2001/12/soap-encoding"> ... Message information goes here ... </SOAP-ENV:Envelope> Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  13. Ex. SOAP Request POST /temp HTTP/1.1 Host: www.socweather.com Content-Type: text/xml; charset="utf-8" Content-Length: xxx SOAPAction: "http://www.socweather.com/temp" <!-- Above: HTTP headers and a blank line. --> <!—These comments below: an XML document --> <?xml version=“1.0”?> <env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> <env:Body> <m:GetTemp xmlns:m="http://www.socweather.com/temp.xsd"> <m:City>Honolulu</m:City> <m:When>now</m:When> </m:GetTemp> </env:Body> </env:Envelope> Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  14. Ex. SOAP Response HTTP/1.1 200 OK Content-Type: text/xml; charset="utf-8" Content-Length: xxx SOAPAction: "http://www.socweather.com/temp" <?xml version="1.0"?> <env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/" env:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/> <env:Body> <m:GetTempResponse xmlns:m="http://www.socweather.com/temp.xsd"> <m:DegreesCelsius>30</m:DegreesCelsius> </m:GetTempResponse> </env:Body> </env:Envelope> Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  15. SOAP Fault • The SOAP fault mechanism returns specific information about the error, including a predefined code, a description, the address of the SOAP processor that generated • A SOAP Message can carry only one fault block • Fault element is an optional part of SOAP Message • For the HTTP binding, a successful response is linked to the 200 to 299 range of status codes; • SOAP fault is linked to the 500 to 599 range of status codes. Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  16. Fault example <?xml version='1.0' encoding='UTF-8'?> <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/1999/XMLSchema-instance" xmlns:xsd="http://www.w3.org/1999/XMLSchema"> <SOAP-ENV:Body> <SOAP-ENV:Fault> <faultcode xsi:type="xsd:string"> SOAP-ENV:Client </faultcode> <faultstring xsi:type="xsd:string"> Failed to locate method (ValidateCreditCard) in class (examplesCreditCard) at /usr/local/ActivePerl-5.6/lib/ site_perl/5.6.0/SOAP/Lite.pm line 1555. </faultstring> </SOAP-ENV:Fault> </SOAP-ENV:Body> </SOAP-ENV:Envelope>

  17. WSDL: Web Services Description Language • Describes a programmatic interface to a Web service, including • Definitions of data types • Input and output message formats • The operations provided by the service • Network addresses • Protocol bindings Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  18. WSDL structure <definitions><types>  definition of types........</types><message>  definition of a message....</message><portType>  definition of a port.......</portType><binding>  definition of a binding....</binding></definitions> Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  19. A WSDL document describes a web service using these major elements: Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  20. WSDL Ports • The <portType> element is the most important WSDL element. • It describes a web service, the operations that can be performed, and the messages that are involved. • The <portType> element can be compared to a function library (or a module, or a class) in a traditional programming language. • WSDL Messages • The <message> element defines the data elements of an operation. • Each message can consist of one or more parts. The parts can be compared to the parameters of a function call in a traditional programming language. • WSDL Types • The <types> element defines the data types that are used by the web service. • For maximum platform neutrality, WSDL uses XML Schema syntax to define data types. • WSDL Bindings • The <binding> element defines the message format and protocol details for each port. Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  21. WSDL example <message name="getTermRequest">  <part name="term" type="xs:string"/></message><message name="getTermResponse">  <part name="value" type="xs:string"/></message><portType name="glossaryTerms">  <operation name="getTerm">    <input message="getTermRequest"/>    <output message="getTermResponse"/>  </operation></portType> Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  22. portType Operations Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  23. <?xml version="1.0"?> <!-- the root element, wsdl:definitions, defines a set of --> <!-- related services --> <wsdl:definitions name="Temperature" targetNamespace="http://www.socweather.com/schema" xmlns:ts="http://www.socweather.com/TempSvc.wsdl" xmlns:tsxsd="http://schemas.socweather.com/TempSvc.xsd" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"> <!-- wsdl:types encapsulates schema definitions of --> <!-- communication types; here using xsd --> <wsdl:types> <!-- all type declarations are expressed in xsd --> <xsd:schema targetNamespace="http://namespaces.socweather.com" xmlns:xsd="http://www.w3.org/1999/XMLSchema">

  24. <!-- xsd def: GetTemp [City string, When string] --> <xsd:element name="GetTemp"> <xsd:complexType> <xsd:sequence> <xsd:element name="City" type="string"/> <xsd:element name="When" type="string"/> </xsd:sequence> </xsd:complexType> </xsd:element> <!-- xsd def: GetTempResponse [DegreesCelsius integer] --> <xsd:element name="GetTempResponse"> <!-- XML Schema entry as above --> </xsd:element> <!-- xsd def: GetTempFault [errorMessage string] --> <xsd:element name="GetTempFault"> <!-- XML Schema entry as above --> </xsd:element> </xsd:schema> </wsdl:types>

  25. <!-- wsdl:message elements describe potential transactions --> <!-- Most messages, as here, have only one part. Multiple --> <!-- parts provide a way to aggregate complex messages --> <!-- request GetTempRequest is of type GetTemp --> <wsdl:message name="GetTempRequest"> <wsdl:part name="body" element="tsxsd:GetTemp"/> </wsdl:message> <!-- response GetTempResponse is of type GetTempResponse --> <wsdl:message name="GetTempResponse"> <wsdl:part name="body" element="tsxsd:GetTempResponse"/> </wsdl:message> <!-- wsdl:portType describes messages in an operation --> <wsdl:portType name="GetTempPortType">

  26. <!-- wsdl:operation describes the entire protocol from --> <!-- input to output or fault --> <wsdl:operation name="GetTemp"> <!-- The order input preceding output indicates the --> <!-- request-response operation type --> <wsdl:input message="ts:GetTempRequest"/> <wsdl:output message="ts:GetTempResponse"/> <wsdl:fault message="ts:GetTempFault"/> </wsdl:operation> </wsdl:portType> <!-- wsdl:binding specifies a serialization protocol --> <wsdl:binding name="TempSvcSoapBinding" type="ts:GetTempPortType">

  27. <!-- leverage off soap:binding document style --> <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> <!-- semi-opaque container of network transport details --> <!-- classed by soap:binding above @@@ --> <wsdl:operation name="GetTemp"> <soap:operation soapAction="http://www.socweather.com/TempSvc"/> <!-- further specify that the messages in the --> <!-- wsdl:operation "GetTemp" use SOAP? @@@ --> <wsdl:input> <soap:body use="literal" namespace="http://schemas.socweather.com/TempSvc.xsd"/> </wsdl:input>

  28. <!-- As above for wsdl:output and wsdl:fault --> </wsdl:operation> </wsdl:binding> <!-- wsdl:service names a new service "TemperatureService" --> <wsdl:service name="TemperatureService"> <wsdl:documentation>socweather.com temperature service </wsdl:documentation> <!-- connect it to the binding "TempSvcSoapBinding" above --> <wsdl:port name="GetTempPort" binding="ts:TempSvcSoapBinding"> <!-- give the binding a network address --> <soap:address location="http://www.socweather.com/TempSvc"/> </wsdl:port> </wsdl:service> </wsdl:definitions>

  29. WSDL Data Model Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  30. Directory Services • Support discovery: enable applications, agents, Web service providers, Web service requestors, people, objects, and procedures to locate each other • White pages – entries found by name • Yellow pages – entries found by characteristics and capabilities • A basic directory might be a simple database (passive) or a broker/facilitator (active, that provides alerts and recruits participants) • UDDI – both white pages and yellow pages, but passive Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  31. UDDI: Universal Description, Discovery, and Integration • UDDI is a Web service that is based on SOAP and XML • UDDI registers • tModels: technical descriptions of a service’s behavior • businessEntities: describes the specifications of multiple tModels Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  32. Yellow, Green, and White Pages in UDDI Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  33. Data Model for UDDI Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  34. businessEntity data structure: <businessEntity businessKey="uuid:C0E6D5A8-C446-4f01-99DA-70E212685A40" operator="http://www.ibm.com" authorizedName="John Doe"> <name>Acme Company</name> <description> We create cool Web services </description> <contacts> <contact useType="general info"> <description>General Information</description> <personName>John Doe</personName> <phone>(123) 123-1234</phone> <email>jdoe@acme.com</email> </contact> </contacts> <businessServices> ... </businessServices>

  35. <identifierBag> <keyedReferencetModelKey="UUID:8609C81E-EE1F-4D5A-B202-3EB13AD01823" name="D-U-N-S" value="123456789" /> </identifierBag> <categoryBag> <keyedReferencetModelKey="UUID:C0B9FE13-179F-413D-8A5B-5004DB8E5BB2" name="NAICS" value="111336" /> </categoryBag> </businessEntity> Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  36. businessService data structure <businessService serviceKey="uuid:D6F1B765-BDB3-4837-828D-8284301E5A2A" businessKey="uuid:C0E6D5A8-C446-4f01-99DA-70E212685A40"> <name>Hello World Web Service</name> <description>A friendly Web service</description> <bindingTemplates> ... </bindingTemplates> </businessService> Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  37. bindingTemplate Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  38. WSDL  UDDI Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

  39. Chapter 2 Summary The main triad of Web services standards • Bring together well-known ideas • SOAP: object access and messaging • WSDL: based on CORBA IDL • UDDI: based on directories • Provide necessary functionality for interoperation • Are complicated in their details • Meant for tool vendors rather than programmers • Increasingly hidden by tools Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

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