l11-12 - CS 290C: Formal Models for Web Software Lectures...

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Unformatted text preview: CS 290C: Formal Models for Web Software Lectures 11 and 12: Formal Modeling and Verification of Web Services, Orchestration and Choreography Instructor: Tevfik Bultan Web Revolution Sharing information using Internet has been a big success Key components Internet Internet protocols such as TCP/IP WWW and HTTP HTML format Web browsers Sharing information using the http+html+browser framework has been successful in a lot of applications List your favorite web sites here What Next? There are applications where http+html+browser framework does not work Business to business applications HTML is developed for displaying information in a way that is understandable for humans HTML is not very useful in helping computers understand the content Basic Question Can we extend the interaction and sharing that WWW created among humans to interaction and sharing among services where the services share information and collaborate using the Internet? More Questions What should be the format that the services share the information? How will the information format be defined? What protocol will the computers use to send and receive information? How can a computer find out about the information provided by another computer? How can we describe the interaction among multiple computers? Some Proposed Answers What should be the format that the services share the information? XML How will the information format be defined? XML Schema What protocol will the services use to send and receive information? SOAP How can a service find out about the information provided by another service? WSDL, UDDI How can we describe the interaction among multiple services? BPEL, WS-CDL Web Services Standards Stack Data Type Service Orchestration Protocol WS-BPEL Web Service Standards Implementation Platforms Microsoft .Net, Sun J2EE WSDL, UDDI SOAP XML Schema XML WS-CDL Choreography What are Web Services? Web services can be described as web accessible software that provide interfaces for service description, discovery, and interaction Web Services: Challenges Web services implemented using different implementation platforms should be able to interact with each other There are different implementation platforms such as .Net or J2EE It should be possible to modify an existing web service without modifying other services that interact with it Web services should be able tolerate pauses in availability of other services and slow data transmission Web Services: Challenges Cant we solve these challenges with existing technologies? Existing technologies for distributed computing such as CORBA and RMI require tight coupling among applications It is not possible to specify interactions among services using stateless protocols Web Services: Characteristics Web services address these challenges with the following common characteristics:...
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l11-12 - CS 290C: Formal Models for Web Software Lectures...

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