Web Service的过去、现在和未来.ppt

0 Web Services: Past, Present, and Future Eric Newcomer CTO, IONA Technologies June 12, 2002 Overview Web services origins: XML RPC RosettaNet The basics: SOAP, WSDL, UDDI Extending the core technologies The battle over the future Where do they come from? Web services comprise two interaction styles: Remote Procedure Call (RPC) oriented Document (aka message) oriented RPC oriented was the original spec, based on XML-RPC Document oriented was added to incorporate RosettaNet style interaction XML-RPC Original basis of SOAP specification Developed by Dave Winer and others at UserLand in 1999 Spec available from Publishing company, now doing Weblogs Spec adopted by Microsoft, DevelopMentor IONA first Java vendor, Feb. 2000 XML RPC example RosettaNet Independent consortium formed to streamline electronics manufacturing: Essentially motivated to emulate Dell Standardized business process interactions over the Internet, including: Business process flow Document content XML protocol over HTTP (RNIF) RosettaNet example Next revolution in software? Novell acquisition of Silverstream Silverstream execs quoted on the radio:“Web services are the next revolution in software” What is a Web Service? All of us have seen them in URLs: Now we will see them in XML: Definition(s) An XML document transmitted remotely and mapped to an executable program “A Web service is a software application identified by a URI, whose interfaces and binding are capable of being defined, described and discovered by XML artifacts and supports direct interactions with other software applications using XML based messages via internet-based protocols” – W3C Web Services Arch WG Major types of Web services Document-oriented Sends data formatted as a business document such as a purchase order Like Electronic Data Interchange (EDI) Typically initiates a process flow Remote procedure call (RPC) oriented Sends data formatted as arguments to a procedure or object invocation Like CORBA, COM, or EJB Return