Formal Modeling of BPEL Workflows Including Fault and Compensation Handling

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1 Formal Modeling of BPEL Workflows Including Fault and Compensation Handling Máté Kovács, Dániel Varró, László Gönczy Budapest University of Technology and Economics Dept. of Measurement and Information Systems Research supported by Software Engineering for Service-Oriented Overlay Computers (SENSORIA) EU FET-IST project.

2 2 Contents Motivation to modeling and verifying business processes Short introduction to the BPEL language Comparison of existing approaches Feature presentation

3 3 Motivation Web service composition (e.g. BPEL) Widespread tool support Verification techniques still need improvement Design errors of orchestration Our aim: Check requirements on workflows formally Derive formal models by model transformations

4 The Execution of Workflows 4 Traditional Electronic Recording Paper Establish type Web service call Establish type Recording Policy Policy Workflow engine Premium Premium Pay Reject Pay Reject

5 5 Implementing Workflows Languages: BPEL, XPDL Very high level XML based Interpreted No debugger provided Difficult to follow the control flow of a process instance

6 6 Testing Workflows Problem: the testing of workflows The data is stored in remote databases The effects of test phases have to be rolled back Solution: the formal analysis of workflows Formal workflow semantics Formal verification of properties E.g. variable access Fault simulation: assessment of error propagation

7 7 A Workflow Example Basic activity Beginning of parallel execution Selection Policy Reject Recording Establish type Control flow Premium Pay End of parallel execution

8 8 The Concepts of Workflows Basic activities Structured activities Data flow / control flow? Policy check Reject Register Type classification Balance Accept

9 9 A BPEL Example Basic activities Structured activity

10 10 BPEL: Web Service Orchestration

11 11 BPEL Instructions Basic activities: Invoke Receive Reply Empty Terminate Throw Compensate Structured activities Scope Sequence Flow While Switch Pick

12 12 Structure of BPEL Workflow: the main business process Fault handler: Faults thrown in workflow User defined or default handler Compensation handler: Initiated from outside User defined or default handler

13 13 Scope hierarchy Workflow Fault Handler Compensate Compensation handler Workflow Fault Handler Compensation handler Throw Compensate Workflow Fault Handler Compensation handler

14 14 Some Existing Approaches W.van der Aalst and K. van Hee. Workow Management Models, Methods, and Systems. The MIT Press, Regular Petri net modeling basic workflows S. Nakajima. Model-checking behavioral specication of BPEL applications. Electr. Notes Theor. Comput. Sci.,151(2):89105,2006. BPEL modeling with Extended Finite-State Automata: event and fault handling is not considered

15 15 Some Existing Approaches M.Kovacs and L.Gonczy. Simulation and formal analysis of workflow models. In GT-VMT, pages , Modeling formalism: dataflow networks Limited success w.r.t. the covering of event handling S. Hinz, K. Schmidt, and C. Stahl. Transforming BPEL to Petri Nets. In W.M.P.v.d.Aalst, B. Benatallah, F.Casati,and F.Curbera, editors, Proceedings of the Third International Conference on Business Process Management (BPM2005), volume 3649 of Lecture Notes in Computer Science, pages , Nancy, France, Sept Springer-Verlag. Petri net model covering the entire BPEL semantics One of the most extensive modeling approach w.r.t. BPEL features The semantics of compensation handling is over approximated / generalized

16 16 Modeling the Behaviour of Variables Uninitialized Read Written Written & read Information carried: If the variable contains data If it has already been used

17 17 Fault Model and Error Propagation Error is probagated by basic activities (read-write) Uninitialized Intact Value Read Written Written & read Faulty Written Erroneous Value Faulty written & read

18 18 Modeling Basic Activities Ready Compleded Activated Variable read Activated: the control reached the activity Dotted arrow: tiggers when the containing activity finishes

19 19 Modeling Structured Activities <sequence> <invoke name="a"/> <invoke name="b"/> </sequence> sequence=running AND invoke_a=ready invoke_a=actviated; sequence=running AND invoke_b=ready AND invoke_a=finished invoke_b=activated; sequnece=running AND invoke_b=finished sequence=finished; Ready Finished Activated Running

20 20 Modeling Scopes Activated Ready Faulthandling Completed with fault Running Finished Compensating Compensated Restriction: scopes may not be executed in an iterative manner.

21 21 Constraints of Activity Triggering Scope3 <invoke/> Fault Handler Compensation handler Scope2 Workflow Fault Handler Compensation handler Scope1 Workflow Fault Handler Compensation handler AND scope_1=faulthandling AND scope_2=compensating AND scope_3=running AND

22 22 Prototype Implementation Transition system Abstract data

23 23 Prototype Implementation Transition system Abstract data Requirement LTL: linear temporal logic

24 24 Prototype Implementation Transition system Abstract data Requirements LTL: linear temporal logic Model-checker Evaluation of LTL expressions Exhaustive state space exploration

25 25 Prototype Implementation Transition system Abstract data Modelltranszformáció transformation VIATRA2 framework graph transformation abstract state machines Requirements LTL: linear temporal logic Model-checker Evaluation of LTL expression Exhaustive state space exploration

26 26 Preliminary Results Verification of a Online Shop process: 10 structured activities 27 basic activities Results Negative results within 3-5 minutes The proof of positive cases takes n*10 minutes

27 27 Plans for the Future Algorithmical generation of common requirements: Uninitialized variables are never read Synchronous processes never end without an answer Modeling the composition of multiple BPEL workflows Back annotation to workflow editors

28 28 Thank you for your attention!

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