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Bottom-Line Web Services

Bottom-Line Web Services



Web services for citizens

Web services for citizens



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    Bottom-Line Web Services Bottom-Line Web Services Presentation Transcript

    • Bottom-line web services Demystifying, coding and even more coding
    • So much confusion
      • What
      • Why
      • How
    • What!
      • Some would say:
      • Your new best friends
      • The savior of your business (or projects)
      • The new generation of web
      • Others would say:
      • The doom of your web app and business
    • What the heck!
      • More confusion:
      • XML JSON
    • So Really, What are they?!
      • In a very straight answer they are:
      • a network interface to application functionality, based on standard Internet technologies.
    • Take a look
      • A Web service lets you access application functionality over the Internet or just any other network!
      As a programmer Web services can be thought of as functions that you can call over the Internet!
    • we all speak the same language
      • a Java program can access and use a Web service written in VB.NET and deployed on a Windows server just as easily as a Windows (say C#) program can use a Web service written in Java and running on a Linux Web server.
    • Like what?
      • spell checking, translation , …
      • stock quotes, currency exchange rates, …
      • Weather Reports
      • And the list goes on and on!
    • How !
      • Web service technology has evolved around a stack of five technologies
    • Example
      • Real examples goes across the stack in a top – down approach!
    • All that for just a RPC
      • UDDI, WSDL, and SOAP
      • Nothing really new they are all XML Based
    • Exotic!!!!!!!!!!!!!
    • SOAP is Fat, XML-RPC is neat
      • SOAP Specification is 11,000 words
      • XML-RPC Specification is 1500 words
      • XML-RPC has a stable specification, SOAP might undergo some changes
      • SOAP is meant for enterprise level apps
      • SOAP with be the W3C standard pretty soon!
    • Sample XML-RPC message
      • Request (from your XML-RPC client):
      •   POST /xmlrpcInterface HTTP/1.0  User-Agent: Sitepoint XML-RPC Client 1.0  Host: xmlrpc.sitepoint.com  Content-type: text/xml  Content-length: 195  <?xml version=&quot;1.0&quot;?>  <methodCall>
      • <methodName>forums.getNumTodaysThreads</methodName>    <params>       <param><value><string>Study</string></value></param>    </params>  </methodCall>
    • Sample XML-RPC message
      • Response (from the XML-RPC server):
      • HTTP/1.1 200 OK  Connection: close  Content-Length: 148  content-Type: text/xml  Date: Wed, Jul 28 1999 15:59:04 GMT  Server: Sitepoint XML-RPC Server 1.0  <?xml version=&quot;1.0&quot;?>  <methodResponse>    <params>       <param>        <value><int>42</int></value>       </param>    </params>  </methodResponse>
    • XML vs. JSON
      • James Clark (creator of XML) said:
      • any damn fool could produce a better data format than XML
      • Douglas Crockford Created JSON
    • JSON
      • JSON (JavaScript Object Notation) is a lightweight data interchange format.
      • It is easy for humans to read and write.
      • It is easy for machines to parse and generate.
      • It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999.
      • JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others.
      • These properties make JSON an ideal data-interchange language.
    • Quick Sample
    • Oh, Thank you!!
    • References
      • Web Services Demystified By Kevin Yank
      • at Sitepoint.com
      • Wikipedia.com