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SOA using Java Web Services and Ajax

SOA using Java Web Services and Ajax. Mark D. Hansen Author of “SOA Using Java Web Services” http://soabook.com. Mark Hansen’s Background. Consultant, Entrepreneur, MIT PhD Book and code examples at http://soabook.com SOA-J open source project at http://soa-j.org. Outline.

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SOA using Java Web Services and Ajax

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  1. SOA using Java Web Services and Ajax Mark D. Hansen Author of “SOA Using Java Web Services” http://soabook.com

  2. Mark Hansen’s Background • Consultant, Entrepreneur, MIT PhD • Book and code examples at http://soabook.com • SOA-J open source project at http://soa-j.org

  3. Outline • What is SOA? • What are Web Services? • What are Java Web Services (JWS)? • What is AJAX? • How can you implement SOA with JWS and AJAX? • Demo (eBay, Amazon, Yahoo!)

  4. What is SOA? • Loose coupling • Service contract • Autonomy • Abstraction • Reusability • Composability • Statelessness • Discoverability “Service-Oriented Architecture”, Thomas Erl, Chapter 3 pg 34 - 37

  5. What is a Web Service? • A provider that enables access to the service via either: • SOAP • XML / HTTP • A description or contractthat specifies the request/response message structure. • WSDL • XML Schema (insufficient) • WADL (new)

  6. What are Java Web Services (JWS)? • The provider is written in Java and deployed using a Java container. • The consumer is written in Java. • Java Web Service APIs are used: • JAX-WS • JAXB • WS-Metadata (JSR-181) • WSEE (JSR-109) JAX-RPC is deprecated starting in Java EE 5

  7. Client Side JWS

  8. Server Side JWS

  9. package samples; import javax.jws.WebService; @WebService public class Hello { public String sayHello(String s) { return "Hello: " + s; } } <definitions ... targetNamespace="http://samples/" name="HelloService"> <types> ... </types> <message name="sayHello"> ... </message> <portType name="Hello"> <operation name="sayHello"> <input message="tns:sayHello"/> <output message="tns:sayHelloResponse"/> </operation> </portType> <binding name="HelloPortBinding" type="tns:Hello"> <soap:binding ... /> <operation name="sayHello"> ... </operation> </binding> <service name="HelloService"> <port name="HelloPort“ ... </port> </service> </definitions> JAX-WS Maps WSDL to a Java API

  10. JAXB Maps XML Schema to Java Classes

  11. What is AJAX? • Asynchronous JavaScript and XML • An Interaction Model • A Set of Technologies for Rich Client Development • ... • A Composite Application Framework for Flexible Business Process Management ??? “Ajax In Action”, Dave Crane et al., Chapter 2 pg 33

  12. SOA Using JWS and Ajax

  13. SOAShopper Architecture

  14. Demo SOAShopper – Integrating Yahoo!, Amazon, and eBay

  15. eBay WSDL

  16. Ant Task to Compile eBay WSDL

  17. Using the Generated eBay API

  18. A Client Binding Example public List<Offer> offerSearch( String keywords, Category category, Price lowprice, Price highprice) { ShopperImp binding = BindingService.getBinding( ShopperImp.class, EBayAPIInterface.class); return binding.offerSearch(keywords, category, lowprice, highprice); }

  19. Implementing a Binding Service publicabstractclass BindingService { publicstatic <C> C getBinding( Class<C> client, Class<?> service) { ... } }

  20. Flash Demo

  21. Using the Dojo Table Widget <table dojoType="filteringTable" id="fromSOAShopperData" multiple="true" alternateRows="true" cellpadding="0" cellspacing="0" border="0" style="margin-bottom:24px;"> <thead> <tr> <th field="source" dataType="String">Source</th> <th field="thumbnail" dataType="html" align="center">Image</th> <th field="price" dataType="String">Price</th> <th field="summary" dataType="String">Summary</th> <th field="url" dataType="html">Link</th> </tr> </thead> </table>

  22. Invoking the REST Endpoint function retrieveURL(url) { restURL = url; showSearchingMsg(restURL); if (window.XMLHttpRequest) { // Non-IE browsers req = new XMLHttpRequest(); req.onreadystatechange = processStateChange; try { req.open("GET", url, true); req.setRequestHeader('Content-type','text/xml'); } catch (e) { alert(e); } req.send(null); } else if (window.ActiveXObject) { // IE req = new ActiveXObject("Microsoft.XMLHTTP"); ... } }

  23. Loading the Dojo Table function populateTableFromLiveSOAShopperData() { try { var w = dojo.widget.byId("fromSOAShopperData"); w.store.setData(theSOAShopperLiveData); } catch(e) { alert(e); } }

  24. Resources • SOA Using Java Web Services http://soabook.com • Thomas Erl’s SOA Book http://www.thomaserl.com/books.asp • Ajax In Action http://www.manning.com/crane/ • SOA-J open source project http://soa-j.org

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