1 CSSE 477 – Using SOA Services Steve Chenoweth Tuesday, 11/1/11 Week 9, Day 2 Right – IBM’s picture of “ways to start thinking about SOA.” From operworks/webservices/ne wto/. operworks/webservices/ne wto/

2 Today SOA assignment - Find and explain how to use an SOA service. –This will be a short project started in class, due Thurs. Thursday – –More about SOA –Turn in your findings about using an SOA service. Friday – –A day to work on your presentations for week 10

3 Be a new SOA developer With your project team, find an interesting service you could use, and explain what it does. Try to do a sample use of the service, using one of the online facilities for this. Extra credit for finding a service which would be useful to something in your project app. Describe how you’d do the WSDL & SOAP stuff in a particular language. And -- decide what would make a service from your own app!

4 Steps Explore some possible services! –At you can see the results on “SEEKDA” of my search for free SOA services from universities. –Think of some interesting key words yourself, and look for related services. –Pick a promising one, and… See how close you can come to “trying it.” –On my machine, SEEKDA’s tools for this sometimes hang up in IE, but worked on Firefox. –Alternatively, you could try the “generic SOAP client” at All you need is the SOA to start the service (plus an idea of what data to enter!). –Describe how this experiment went. 

5 Steps - cntd Describe how you would use programmatic tools to do these same accesses, using a language of your choice, other than Java. (Your team should vote on this!) –Include a way of reading WSDL’s –Include a way of using SOAP to pass messages. For Java, –There’s an intro to using these tools at htm. htm –The actual libraries are on other pages of Oracle’s language info. E.g., see for how to create a WSDL. –In the case of Java, tools like Apache Axis also provide a Web Services library! (This is the WSDL2Java stuff). See for example guide.html#WSDL2JavaBuildingStubsSkeletonsAndDataTypesFromWSDL. guide.html#WSDL2JavaBuildingStubsSkeletonsAndDataTypesFromWSDL

6 Steps - cntd Your general description for the SOAP interactions in the language should sound something like this (only language specific), which is taken from Your program passes the name of the remote method to invoke and any necessary parameters. The library assembles the appropriate XML document of a SOAP request to package this information. The library passes this XML document to the SOAP server identified by a SOAP endpoint URL, much the way you point a browser at a Web server address by specifying the server's URL. After the SOAP server attempts to execute the method, it assembles a SOAP response XML document around the result of the execution and passes it back to the SOAP client. Upon receiving the SOAP response, the client library parses the XML to get the result of the method invocation and passes this result to the program using the library.

7 And Turn in one description (with all of the team members’ names) of -- What you did to check out a useful service and what did it’s WSDL describe, The language-specific WSDL/SOAP tools you found in your language of choice, and How you would use them, step by step. Final question – what in your own application might be turned into an SOA “service”. Turn this in Thursday in class!? (One per team.)