Specifying Components with Compositional Patterns, LOTOS and Design By Contract

specification of a component  The abstract specification contains a formal model of design component, called design component contract.  A design component contract includes structural contract, behavioural contract and interface contract 11/06/2013 11 SEDE 2010, San Francisco The abstract specification contract is defined by:  ASC::={, ,, } For all i, j / i # j name.cpi # name.cpj 12 11/06/2013 SEDE 2010, San Francisco The abstract specification contract is defined by:  ASC::={, ,, } describe the relations of the constructs of each design component 11/06/2013 13 SEDE 2010, San Francisco The abstract specification contract is defined by:  ASC::={, ,, } The finite set of input or output ports attached to a design component and the set of messages sent to or received by a component 11/06/2013 14 SEDE 2010, San Francisco The abstract specification contract is defined by:  ASC::={, ,, } The behavioural properties are constraints such as event ordering, and action sequence of each design component 15 SEDE 2010, San Francisco 11/06/2013 Structural contracts The structural aspect of a design component contract SC is a tuple SC = (C, A, M, T, Ar, Pc,Pa,),where  C is a set of classes in the design component,  A is a set of attributes defined in classes C,  M is a set of methods defined in classes C,  T is a set of types,  Ar is a set of access rights = {public, protected, private},  Pc is a set of connection predicates symbols that capture the relationships For example (Inherit, association, aggregation,..), and  Pa is a set of action predicates symbols that can perform in a design component For example (invoke, new, return...) 11/06/2013 SEDE 2010, San Francisco 16  Can be formalized using a subset of First Order Logic (FOL),  The subset of FOL used to describe the structural aspect of a design component comprises variable symbols, connectives (‘∧’), quantifiers (‘∃’), element (є) and predicate symbols acting upon variable symbols.  The variable symbols represent class, objects, while the predicate symbols represent permanent relations. 11/06/2013 SEDE 2010, San Francisco 17 Entity predicates Relationship predicates Entity predicates define whether a design component has a specific class (abstract or concrete), what a method (or attribute) is defined in a class.... Relationship predicates define the relations between classes, attributes, and operations and the actions that a role can perform in a component. 11/06/2013 SEDE 2010, San Francisco 18