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BCS Teesside Web Services

BCS Teesside Web Services. David Fuller. What I will cover. What are Web Services? What is SOA? What is BPEL? Demonstrate the construction of a web service. What are Web Services.

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BCS Teesside Web Services

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  1. BCS TeessideWeb 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. What are Web Services A 'Web service' is defined by the W3C as "a software system designed to support interoperablemachine-to-machine interaction over a network" 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. Source Wikipedia

  4. What are RESTful Web Services? • Representational state transfer • Described by Roy 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 • It’s what the world-wide-web does

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

  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 doesn’t 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 • Abstraction • Composability • Autonomous • Stateless • Discoverable

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

  19. JSR 181 @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 2nd generation Web Service standards • They start with WS- prefix

  21. WS-* • Include: • Messaging Specifications • WS-Notification • WS-Addressing • WS-Transfer • WS-Eventing • WS-Enumeration

  22. WS-* • Metadata Exchange Specifications • WS-Policy • WS-PolicyAssertions • WS-PolicyAttachment • WS-Discovery

  23. WS-* • Security Specifications • WS-Security • WS-SecureConversation • WS-Trust • WS-Federation

  24. WS-* • Include: • Reliable Messaging Specifications • WS-ReliableMessaging • WS-Reliablility

  25. WS-* • Include: • Business Process Specifications • WS-BPEL • WS-Choreography • WS-CDL

  26. WS-* • Include: • Transaction Specifications • WS-AtomicTransaction • WS-Coordination • WS-CAF • WS-Transaction • WS-Context • WS-CF

  27. WS-* • Include: • Management Specifications • WS-Management • WS-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 a XML-based business process modeling language that describes collaboration protocols of cooperating Web Service participants, in which services act as 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.org and www.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?title=JBossWS

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