Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.1/19

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1 Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench Mariya Koshkina / Franck van Breugel IBM, Toronto / York University, Toronto Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.1/19

2 Concurrency Workbench (CWB) Verification tool originally developed at North Carolina State University and currently maintained at SUNY Stony Brook Originally intended for verification of CCS (Calculus of Communicating Systems), but can be extended to support other languages Supports several verification methods Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.2/19

3 Supported Verification Methods Model checking process P property φ does P satisfy φ? yes/no Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.3/19

4 Supported Verification Methods Preorder checking process I process S does I implement S? yes/no Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.4/19

5 Supported Verification Methods Equivalence checking process P process Q do P and Q behave the same? yes/no Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.5/19

6 Overview BPE-calculus small language based on BPEL4WS (Business Process Execution Language for Web Services) We extend CWB to support BPE-calculus Process Algebra Compiler (PAC) tool used to extend CWB syntax of BPE-calculus semantics of BPE-calculus PAC modules CWB Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.6/19

7 BPE-Calculus Small language that captures the flow of control of BPEL4WS Abstracts from some of the details: Abstracts from data Abstracts from compensation/fault handlers Does not model time Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.7/19

8 BPE-Calculus Syntax Models basic constructs of BPEL4WS: Basic activities: External (α) Internal (τ) Prefixing (α.p ) Choice (P + P ) Concurrency (P P ) Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.8/19

9 BPE-Calculus Syntax Synchronization is provided by links a s b l c a t Outgoing link: l b.p Join condition: c P Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.9/19

10 BPE-Calculus Syntax makereservation true l 1 l 1 l 2 The corresponding BPE-process: true l 2 bookroom makereservation.l 1 true.0 findroom.l 2 true.0 (l 1 l 2 ) bookroom.0 findroom Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.10/19

11 BPE-Calculus Semantics Semantics of BPE-calculus is modeled by means of structural operational semantics (Plotkin), which describes the semantics of the process in terms of all possible transitions that the process can make Transition: P Rules: premises conclusion action P (side conditions) Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.11/19

12 BPE-Calculus Semantics A state is a pair P, λ, where λ contains the values of the links (true, false, undefined) Sample rules: (ACT) α.p, λ (FLOWl) α P, λ α P 1, λ P 1, λ α P 1 P 2, λ P 1 P 2, λ (FLOWr) P 2, λ P 1 P 2, λ α P 2, λ α P 1 P 2, λ Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.12/19

13 BPE-Calculus Semantics a 1.l 1 true.0 a 2.l 2 true.0 l 1 l 2 a 3.0 a 1 a 2 τ a 2 a 1 τ a 2 τ τ a 1 τ τ τ a 3 Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.13/19

14 Concurrency Workbench (CWB) We use Process Algebra Compiler (PAC) to extend CWB PAC takes as input: Syntax description file (Yacc-like grammar) Semantics description file (SOS rules) PAC generates: Modules to plug into CWB Resulting version of CWB supports verification of BPE-calculus Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.14/19

15 CWB: Verification Model Checking: verify that a process satisfies a given property Deadlock-freedom Other process-specific properties Example: l 3 a 1.l 1 true.0 l 1 a 2.l 2 true.0 l 2 a 3.l 3 true.0 a 4.0 a 5.0 a 6.0 Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.15/19

16 CWB: Verification Preorder Checking: verify that an implementation satisfies its specification Example: Implementation: receive.τ.l 1 true.0 + receive.τ.l 2 true.0 l1 l 2 reply.0 Specification: receive.reply.0 Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.16/19

17 CWB: Verification Equivalence Checking: check behavioral equivalence Can be used to minimize a process Example: Process receive.τ.l 1 true.0 + receive.τ.l 2 true.0 l 1 l 2 reply.0 is observationally equivalent to receive.reply.0 Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.17/19

18 Conclusion Introduced BPE-calculus that models BPEL4WS Used BPE-calculus syntax and semantics as input to PAC Extended CWB to support BPE-calculus Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.18/19

19 Future Work Extend BPE-calculus to incorporate other features of BPEL4WS: Compensation and fault handlers Time Data Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench p.19/19

Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench

Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench TAV-WEB Proceedings/ACM SIGSOFT SEN PAGE 1 September 2004 Volume 29 Number 5 Modelling and Verifying Web Service Orchestration by means of the Concurrency Workbench Mariya Koshkina IBM 8200 Warden Avenue

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