Service Oriented Computing: SOAP, WSDL and UDDI. Dr. Cristian Mateos Diaz ( ISISTAN - CONICET
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1 Service Oriented Computing: SOAP, WSDL and UDDI Dr. Cristian Mateos Diaz ( ISISTAN - CONICET
2 XML family of standards Domain-specific XML-based standards e.g., MathML, DrawML, RSS, XHTML, SOAP/WSDL/WADL A number of general standards: Well-formed document instances XML Namespaces Validation of document instances DTD Schema Parsing/transformation of document instances Connecting/addressing document components Querying document components XPath/XSLT DOM SAX XLink XQuery XPointer Let us skip these ones...
3 SOAP/WSDL/WADL: Enabling technologies XML (naturally) XML Schemas (rather than DTDs) Namespaces: <x xmlns:edi=' <!-- the "edi" prefix is bound to for the "x" element and contents --> </x> which is equivalent to: <root xmlns:edi=' <edi:x>... </edi:x>... </root>
4 Talk outline Web Services SOAP, WSDL (we will discuss WADL latter), UDDI Developing Web Services Eclipse WTP Testing Web Services soapui Consuming and Invoking Web Services
5 The evolution of the Web Dinamicity/Data complexity Semantic Web Web Services Dynamic Web Web Internet Semantic Clouds? Clouds Computational complexity
6 Web Services Self-contained, self-describing, modular applications that can be published, located, and invoked across the Web More properties: loosely coupled, reusable components, programmatically accessible over ubiquitous protocols, interoperable Close resemblance with component-oriented software Types of Web Services Simple content-provider implementation (stock quote, weather) Complex process or world-altering (hotel and ticket booking, resource handling) GET vs POST in Restful services
7 Components: A simple definition Component = Class (from OO) + structural conventions Real-world example: JavaBeans; OSGi A JavaBean must contain a default constructor A JavaBean must be serializable JavaBean properties must be accessed via getters/setters public class PersonBean implements java.io.serializable { private String name; private int age; public PersonBean() {} public void setname(string n) { this.name = n; } public void setage(int a) { this.age = a; } public String getname() { return (this.name); } public int getage() { return (this.age); } } Other component models usually define other conventions, for example forbid data sharing between components
8 Components vs Web Services Software components are reusable To be used, a component must: - be packaged to be deployed as part of some larger application - fit with the existing framework used to develop the system Components can be sold. - Component developers charge on a per-deployment basis. Many component frameworks for building distributed systems exist (J2EE, DCOM,.NET, CORBA, etc.) but they are not compatible Web services are reusable too. To be used a Web Service must: - be published on the Web Web Services can be sold too. - Service providers can charge on a per-call basis Web services can be composed into larger systems. Unlike components, Web services do not have to be downloaded and deployed to be used by clients.
9 Web Services: Standards organizations When reading about Web Services, you will surely encounter the words standard, specification and extension (i.e., WS-*)...
10 Web Services: Architecture A de facto standard materialization: - Find/Publish/ Unpublish (UDDI or Syntactic registries) - Bind (SOAP+WSDL, JSON+WADL)
11 Web Services: Service consumers PCs/Browsers are not the only way to access Web information! <html> Without WS Web Server C++ Java.NET <html>/ <xml>/ <json> Web Server With WS Server facade (Web Services)
12 Web Services: A layered view... and more elements are being constantly added to this stack! (e.g., security, composition, transactions, etc.)
13 Web Services: Some links Specifications SOAP: WSDL: UDDI: WADL: Java libraries Axis2: UDDI4J: juddi:
14 Five stages dealing with Web Services 1. Denial It's simply some kind of remoting, right? 2. Over Involvement - OK, I'll read the SOAP, WSDL, WS-I WADL, JAX-WS, SAAJ, JAX-B, specs. Next, I'll check the Wiki and finally follow an example showing service and client sides 3. Anger - I can't believe those #$%&*@s made it so difficult! 4. Guilt - Everyone is using Web Services, it must be me, I must be missing something 5. Acceptance - It is what it is, Web Services aren't simple or easy
15 Web Services: SOAP SOAP stands for Simple Object Access Protocol W3C Recommendation SOAP is essentially an XML transport protocol: - There is a sender and a receiver - Content is interchanged between these two
16 SOAP: Body example <?xml version="1.0"?> <soap:envelope xmlns:soap=" <soap:body> <m:dologin xmlns:m= urn:myserver"> <m:login>auser</m:login> <m:password>apassword</m:password> </m:dologin> </soap:body> </soap:envelope> Sender SOAP msg. Receiver MyServer
17 SOAP: Body example (cont.) <?xml version="1.0"?> <soap:envelope xmlns:soap= xmlns:xsd= <soap:body> <m:result xmlns:m= urn:myserver type= xsd:string >afh276gha12345<m:result> </soap:body> </soap:envelope>
18 SOAP: Relationships with HTTP Request: POST /soap HTTP/1.1 Host: Content-Type: text/plain Content-Length: 200 HTTP Client HTTP Server Response: 200 OK Content-Type: text/plain Content-Length: 200 Or Error: 400 Bad Request Content-Length: 0
19 SOAP: Relationships with HTTP (cont.) POST /InStock HTTP/1.1 Host: Content-Type: application/soap+xml; charset=utf-8 Content-Length: nnn <?xml version="1.0"?> <soap:envelope xmlns:soap=" soap:encodingstyle=" <soap:body xmlns:m=" <m:getstockprice> <m:stockname>ibm</m:stockname> </m:getstockprice> </soap:body> </soap:envelope>
20 SOAP: Relationships with HTTP (cont.) HTTP/ OK Content-Type: application/soap; charset=utf-8 Content-Length: nnn <?xml version="1.0"?> <soap:envelope xmlns:soap=" <soap:body xmlns:m=" <m:getstockpriceresponse> <m:price type= xsd:float >34.5</m:Price> </m:getstockpriceresponse> </soap:body> </soap:envelope>
21 Web Services: WSDL WSDL stands for Web Service Description Language W3C standardization effort A WSDL definition is an XML document describing the interface of a SOAP Web Service: - Interface: (operations; input/output) - Access (protocol binding) - Endpoint (location of service)
22 WSDL vs Java WSDL WSDL document Port type Messages Data types Endpoint & binding? Java Java interface (explicit)/ Java class (implicit) Method signatures (behavior) Individual method parameters + return types Argument types
23 WSDL: Document structure <definitions> A WSDL document defines a web service using four major elements: Do not worry... many tools to automagically generate WSDL documents exist! <types> definition of types... </types> <message> definition of a message... </message> <porttype> definition of a port... </porttype> <binding> definition of a binding... </binding> </definitions>
24 WSDL: Operation patterns Similar to calling methods in Java Client Client Service Service Client Client Service Service Somewhat advanced interaction patterns...
25 WSDL: One-way operation example... <message name="newtermvalues"> <part name="term" type="xs:string"/> <part name="value" type="xs:string"/> </message> <porttype name="glossaryterms"> <operation name="setterm"> <input name="newterm" message="newtermvalues"/> </operation> </porttype>...
26 WSDL: Request-response operation example... <message name="getstockquoterequest"> <part name= quote" type="xsd:string"/> </message> <message name="getstockquoteresponse"> <part name= price" type="xsd:float"/> </message> <porttype name= StockQuotePortType"> <operation name= getstockquote"> <input message= getstockquoterequest"/> <output message="getstockquoteresponse"/> </operation> </porttype>...
27 WSDL: Summary Language and platform independent Multiple operation patterns Operations can have multiple inputs and outputs Support for multiple bindings (SOAP, RMI, CORBA, Rest) More than one binding for the same port type
28 Web Services: UDDI UDDI stands for Universal Description, Discovery, and Integration Protocol OASIS standardization effort A UDDI node represents a registry for Web Services: - Business - Service information (taxonomies) - Technical details
29 UDDI: Inspection Browser-based (e.g., Eclipse WTP) Programmatic (e.g., using uddi4j): UDDIProxy proxy = new UDDIProxy(); proxy.setinquiryurl( " testregistry/inquiryapi"); proxy.setpublishurl( " testregistry/protect/publishapi"); BusinessList bl = proxy.find_business("business", null, 0); Vector businessinfovector = bl.getbusinessinfos().getbusinessinfovector(); for (int i = 0; i < businessinfovector.size(); i++) { BusinessInfo businessinfo = (BusinessInfo)businessInfoVector.elementAt(i); System.out.println(businessInfo.getNameString()); }
30 Web Services: Search engines UDDI is more like a structured search engine in the sense that search criteria are prescribed Alternatively, Web Services search engines provide a Google-like interface for looking for services Most of them rely on text processing techniques Performance heavily depends on contract quality Some examples: Woogle: WSQBE: Swoogle: WSCE (syntactic search on top of UDDI): ProgrammableWeb.com, Mashape.com
31 Search engines: Mashape.com
32 Questions? <Web Services/>
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