1. BCS Teesside Web Services David Fuller

2. What I will cover What are Web Services? What is SOA? What is BPEL? Demonstrate the construction of a web service

3. In common usage the term refers to clients and servers that communicate over the HTTP protocol used on the Web. Such services tend to fall into one of two camps: Big Web Services and RESTful Web Services. clientsserversHTTPclientsserversHTTP What are Web Services Source Wikipedia A 'Web service' is defined by the W3C as "a software system designed to support interoperable machine-to-machine interaction over a network" W3C interoperablemachine-to-machinenetworkW3C interoperablemachine-to-machinenetwork

4. What are RESTful Web Services? Representational state transfer Described by Roy Thomas Fielding Roy Thomas FieldingRoy Thomas Fielding A key design idiom that embraces a stateless client-server architecture in which the web services are viewed as resources and can be identified by their URLs Its what the world-wide-web does

5. What are Big Web Services "Big Web Services" use XML messages that generally follow the SOAP standard XML SOAPXML SOAP there is often machine-readable description of the operations offered by the service written in the Web Services Description Language (WSDL) Web Services Description LanguageWeb Services Description Language

6. Web Service Architecture

7. Acronym Competition WSDL Web Service Description Language

8. Acronym Competition UDDI Universal Description, Discovery and Integration

9. Acronym Competition SOAP It doesnt stand for anything It used to be Simple Object Access Protocol but no more

10. Acronym Competition JAX-RPC Java Api for Xml-based Remote Procedure Call – Now part of JAX-WS

11. Acronym Competition JSR Java Specification Request

12. Acronym Competition BPEL Business Process Execution Language

13. Acronym Competition SOA Service Oriented Architecture

14. What is SOA? A collection of loosely-coupled, distributed services which communicate and interoperate via agreed standards Source: Oxford University

15. SOA Principles Reuseability Service contract loose coupling AbstractionComposabilityAutonomousStatelessDiscoverable

16. SOA and Web Services Web Services are not inherently reusable Web Services have service contracts Web Services are loose-coupled Web Services support abstraction Web Services are naturally composable Autonomy has to be designed in Web Services support statelessness Discoverability is beyond the scope of a Web Service

17. What is JSR 181? Web Services Metadata for the Java Platform Simplifies the Java Web service programming model by providing a set of annotations that can be used to declaratively specify the Web services of an application JDK 5 or above Specification released 27 Jun, 2005

18. @WebService ( serviceName = "annotatedBank", targetNamespace = "http://service.annotatedBank" ) public class BankServiceImpl { …. JSR 181

19. @WebMethod (operationName= "create-account") public String createAccount( @WebParam(name="accountName") String acctName,float initBalance) throws RemoteException,AccountException { return m_bank.addNewAccount( acctName,initBalance); }

20. WS-* Set of 2 nd generation Web Service standards They start with WS- prefix

21. WS-* Include: –Messaging Specifications WS-NotificationWS-AddressingWS-TransferWS-EventingWS-Enumeration

22. WS-* –Metadata Exchange Specifications WS-PolicyWS-PolicyAssertionsWS-PolicyAttachmentWS-Discovery

23. WS-* –Security Specifications WS-SecurityWS-SecureConversationWS-TrustWS-Federation

24. WS-* Include: –Reliable Messaging Specifications WS-ReliableMessagingWS-Reliablility

25. WS-* Include: –Business Process Specifications WS-BPELWS-ChoreographyWS-CDL

26. WS-* Include: –Transaction Specifications WS-AtomicTransactionWS-CoordinationWS-CAFWS-TransactionWS-ContextWS-CF

27. WS-* Include: –Management Specifications WS-ManagementWS-ResourceTransfer

28. Orchestration Web Service Orchestration enables web services to be strung together in predefined patterns and executed via orchestration scripts Typically owned by a business The heart of SOA

29. Orchestration

30. Choreography Specification by the W3C defining aW3C XMLXML-based business process modeling language that describes collaborationbusiness process modeling protocols of cooperating Web Service participants, in which services act asWeb Service peers, and interactions may be long-lived and stateful.

31. BPEL Consortium originally made up of BEA (now Oracle), IBM and Microsoft Provides a language defining process flow Supports asynchronous operations and correlations Supports long-running workflows

32. Reference Sites www.WhatIsSOA.com www.SOAPrinciples.com www.WS-Standards.com www.w3.orgwww.w3.org and www.ws-i.org www.ws-i.org www.w3.orgwww.ws-i.org www.w3schools.com/webservices/default.asp http://java.sun.com/webservices/ http://www.oracle.com/technology/index.html http://jbossws.jboss.org/mediawiki/index.php?t itle=JBossWS