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Separating Operational and Control Behaviors Quan Z. Sheng , Zakaria Maamar , Hamdi Yahyaoui ,Jamal Bentahar and Khouloud Boukadi Internet Computing, IEEE May-June 2010 Volume: 14 Issue:3 On page(s): 68 - 76 SSE 3200 Luke Gesior Jeremy Strandberg Problems Web Services are confined to simpler applications WSDL does not show how to oversee executions Design Soundness-Conversation Deadlocks Difficult debugging and testing What are Web Services? application components communicate using open protocols self-contained and self-describing used by other applications What is SOAP? Simple Object Access Protocol Format for sending messages Designed to communicate via Internet Allows you to get around firewalls What is WSDL? Web Services Description Language used to describe Web services What is UDDI? Universal Description, Discovery and Integration a directory for storing information about web services Separation Operational Behavior ◦ Application-dependant ◦ Contains functionality Control Behavior ◦ Application-independent ◦ Builds execution progress Conversational Messages ◦ Convey information between the two www.noaa.gov Two Functions Next(activated, path1) = (commitment, done) Next(activated, path2)= (failure, aborted) Conversational Messages Seven Types ◦ sync, ping, success, ack, fail, delay, syncreq Initiation messages ◦ from control to operational behaviors ◦ start an execution Outcome Messages ◦ from operation to control behaviors ◦ Report on executions status Input Arguments • strp1 – Common Arguments – ID, Name, From,To,Trigger • strp2 – Arguments from control to operational behavior – Authorized activity-time, Authorized passivity-time, Required Participants • strp3 – Arguments from operational to control behavior – Counter-part ID, Effective activity time, Execution Nature Example Sync(str) handles (activated, label1 , inputcollected) ◦ Consists of strp1 and strp2 Conversation Sessions Sequenced conversational messages Sync.Success Sync.Delay.Syncreq.Sync.Succes Some sequences lead to indefinite waiting Solution • • Represent every combination of conversational messages Integrate restrictions to conversational messages – Each Delay message in a sequence should be followed by a Success, Fail, or Syncreq message, that is, Delay(t) ⇒ Success(t + 1) ∨ Fail(t + 1) ∨ Syncreq(t + 1). – Each Ping message in a sequence should be followed by an Ack message, that is, Ping(t) ⇒ Ack(t + 1). • Ensures soundness of design Conclusion and Implementation Coded in Java Consists of four tools system engineers access ◦ Control Behavior Modeler ◦ Operational Behavior Modeler ◦ Conversation Modeler Takes web services behavior as input Produces conversation specification as output, translated into XML ◦ Conversation Controller Provides methods for managing conversations ◦ Service Manager Allows engineer to track and analyze execution Questions (mandatory) References Separating Operational and Control Behaviors Quan Z. Sheng , Zakaria Maamar , Hamdi Yahyaoui ,Jamal Bentahar and Khouloud Boukadi Internet Computing, IEEE May-June 2010 Volume: 14 Issue:3 On page(s): 68 – 76 A Formal Verification Approach of Conversations in Composite Web Services using NuSMV Melissa KOVA1, Jamal BENTAHAR1, Zakaria MAAMAR, and HamdiYAHYAOUI http://www.w3schools.com/ www.noaa.gov