1. INFOSYS 290, Section 3 Web Services: Concepts, Design and Implementation Adam Blum ablum@good.com

2. Today’s Agenda Motivation and history of web services The basics of current web service standards: SOAP and WSDL Goals for the course Project description Outline of future classes

3. My Background Career –5 years at Microsoft building first three versions of SQL Server –VP of Engineering at Commerce One for the XML platform –Chief Technology Officer at Systinet, the first web services company –Director of Data Access at Good Technology Building a new mobile web services platform Why I’m here –No real collection of web service information exists today

4. Student Backgrounds Technologies? –XML Schema –object-oriented design –modeling –distributed systems Programming languages and tools? –Java? –C#,.NET –Perl, Python, PHP, ASP Projects? Work Background? –Programmer, analyst, IT, architect

5. The Next Internet Generation HTML and browsers were app to human communication –Universal human to application access SOAP and XML-based web services are for program to program communication –Separated by program, machine, operating system and organizational boundaries –Universal application to application access

6. What is a Web service? Application capability, function or operation exposed to other programs via open, interoperable standards “payloads” defined as XML documents “transports” over http or other open Internet protocol Can be accessed from any programming language, hardware platform or operating system

7. What is a “Good Web Service”? “self describing” – XML Schema or DTD for grammar of payload – human readable instances discoverable –UDDI, WS-Inspection, or some other method of advertising availability –Realize promise of many to many integrations that are enabled by a web service (one to one ad hoc integrations can be done with earlier technology) “coarse grained” –Large documents representing entire business events or business objects –e.g. CRUD operations: CreateOrder, ReadOrder, UpdateOrder, DeleteOrder –NOT operations such as SetPrice(), SetProduct(), SetCustomer(), CompleteOrder() asynchronous –When appropriate (often for large scale work)

8. Basic SOAP Message Exchange Consuming Program Service Requestor Exposing Program Service Provider http transport SOAP message WSDL describing service Service Registry UDDI discover services WSDLs describing services SOAP message http transport

9. SOAP Message

10. Sample SOAP Envelope uuid:093a2da1-q345-739r-ba5d-pqff98fe8j7d 2001-11-29T13:20:00.000-05:00 Åke Jógvan Øyvind

11. Sample SOAP Message (cont’d) New York Los Angeles 2001-12-14 late afternoon aisle Los Angeles New York 2001-12-20 mid-morning none

12. A Soap Response uuid:093a2da1-q345-739r-ba5d-pqff98fe8j7d 2001-11-29T13:35:00.000-05:00 Åke Jógvan Øyvind – JFK LGA EWR JFK LGA EWR

13. Alternatives to SOAP over http XML documents over HTTP –Less need to do this with commonplace SOAP toolkits –But these are still web services XML RPC –Simpler than SOAP and longer history –Limitations on objects that can be exposed –With current SOAP toolkit support little reason to use

14. Distributed Systems and RPC How did apps once communicate with each other across machine and OS boundaries? remote procedure calls –Java RMI –.NET Remoting –Corba –DCOM

15. So What’s Different? Open format usable from any platform Easy to understand and debug Stable supported interfaces Standards enable “expose service once” and have multiple consumers –versus typical point to point integration efforts Easy for intermediaries to process messages and add value –Routing and delivery –security –management and monitoring –schema and service design – acceleration Easy to extend with additional transport semantics

16. WSDL Specification types message operation porttype operation binding service port

17. An Example - WSDL Types

18. WSDL Operations

19. WSDL Bindings, Services, Ports My first service

20. Web Services Construction Tools CompanyProductURL MicrosoftVisual Studio.NET Web Services Enhancements microsoft.com/vstudio http://msdn.microsoft.co m/webservices/building/ wse/default.aspx IBM/open sourceApache Axisws.apache.org/axis SunJava Web Services Developer Pack 1.4http://java.sun.com/webs ervices/jwsdp/index.jsp BEAWebLogic Workshop and WebLogic Server http://dev2dev.bea.com/ products/wlworkshop81/i ndex.jsp SystinetSystinet Server 5.0http://www.systinet.com

21. Web Services Usage Only Tools CompanyProduct MicrosoftInfoPath MicrosoftAvalon (in Longhorn or Windows Vista) * Not released Microsoft.NET Compact Framework in Visual Studio AboveAllAboveAll Studio Good TechnologyGoodAccess Web Services

22. Demo Simple.NET Web Service Create web service project Expose some web methods Demo accessing it from AboveAll

23. Some Applications Services a web application might need –Credit card verification –Package shipping –Currency conversion –Stock quotes Internal architecture of multiple server applications –User authorization web service –Remote procedure calls Heavy computational tasks –Optimizers –Routing Factor out business logic to expose to many application front ends –E.g. Common Order web service with web page frontend, desktop frontend, cellphone frontend, PDA frontend

24. Existing Web Services Consumer –Google (search, cache, spelling) http://www.google.com/apis/download.html http://www.google.com/apis/download.html –Amazon AWS 4.0 Product search via REST and SOAP Enterprise application ISVs –SalesForce, www.sforce.comwww.sforce.com –Siebel –SAP –Microsoft Miscellaneous Utilities –Xmethods.com Thousands of internal IT applications at many companies –WellsFargo –Motorola

25. Goals of Course Grasp basic web service architectural principles for integration between applications –Learn when when web services are an effective approach to application integration problems Learn the important existing dominant standards in web services –Understand SOAP and its proposed extensions for invoking and routing web services –Be effective designing web services in WSDL and XML Schema –UDDI and when using a web services registry is required Learn other best practices in Service Oriented Architectures including what it means to perform web services management Consume web services with a variety of ad hoc tools and programs Understand the missing pieces of current web services standards and the roadmap to new standards for resolving them Build applications that connect to web services from both desktops and mobile devices

26. Course Project Goal –Build “web service consuming” client applications from desktops and mobile devices Requirements –Use an “informational” web service Has QCUD (Query, Create, Update and Delete operations) –Consume web service from AboveAll or Visual Studio for desktop –Consume WS from GoodAccess Web Services or Visual Studio from mobile device –Optionally write or enhance a backend web service Only if previous steps are achieved –Demo to class Team size –Two people per project

27. Possible “Informational Web Services” for Your Projects Stock/company/financial information Sales account information Cal course schedule Books that match search criteria (using Amazon’s WS) Documents that match search criteria (using google’s WS) Course assignments Calendar appointments Project bugs Bank account records BART schedules Directions to multiple sites Local sites of interest Blogs (via Atom-wrapping web service) News (via an RSS-wrapping web service)

28. Course Schedule Class 1 (September 1): Introduction Class 2 (September 8): Describe and Invoke: WSDL and SOAP and Their Precursors Class 3 (September 15): Consuming Web Services –MindReef SOAPScope –AboveAll Studio –Visual Studio.NET Class 4 (September 22): Creating Web Services –In Microsoft Visual Studio.NET Class 5 (September 29): Mobile Web Services Clients –Microsoft’s.NET Compact Framework –J2ME with IBM WebSphere Developer Studio Class 6 (October 6th): GoodAccess Web Services –Platform for automatic syncing and efficient transport of web services Class 7: Midterm (October 13 th )

29. Second Half Class 8 (October 20): Register and Discover: Service Registries and UDDI –IBM, Microsoft and Systinet UDDI registries –Register your services in a UDDI Class 9 (October 27 th ): Web Services Metadata Repositories and Composite Tools –Guest lecture from Roger Sippl, AboveAll Class 10 (November 3rd): Web Services Security Class 11 (November 10th): The Enterprise Web Services Bus Class 12 (November 17th): SOA Best Practices Class 13 (November 24): No Class - Thanksgiving Class 14 (December 1): Presentations Class 15 (December 8): Presentations Class 16 (December 15): Final Exam

30. References Specs –SOAP Specification, http://www.w3.org/TR/soap/ –WSDL Specification, http://www.w3.org/TR/wsdlhttp://www.w3.org/TR/wsdl –UDDI Specification, http://www.uddi.org/specification.html http://www.uddi.org/specification.html Tools –Visual Studio, http://microsoft.com/vstudiohttp://microsoft.com/vstudio Will be supply Visual Studio 2005 Beta to the class –AboveAll Studio, http://aboveallsoftware.com –MindReef SOAPScope

31. How To Reach Me ablum@good.com TA: awright@good.com, aliseya@eecs.berkeley.eduawright@good.com 408-396-5490 Office hours Thursday at 4pm