Synthesising Call Sequences from OCL Operational Contracts

The Unified Modeling Language (UML) is widely used by software engineers in different phases of software development cycle. It allows them to visualise and depict a system into different diagrams. Among these diagrams, UML class diagrams are used to capture the structure of a system including classes, attributes and associations. The set of operation calls defined in a UML class diagram then capture the behaviour of a system. These operation calls typically constrain the inputs and outputs via a set of pre or postconditions (operational contracts) written in Object Constraint Language (OCL). Hence, a sequence of operation calls conforming to pre or postconditions is crucial to analyse, verify and understand the behaviour of a system. In this paper, we propose a new technique for synthesising call sequences from a set of operational contracts. This technique works by reducing a synthesis problem to a satisfiability modulo theories (SMT) problem. The preliminary results show that our technique is capable of synthesising call sequences at a large scale