Designing Object Systems: Object-Oriented Modelling with by Steve Cook, John Daniels

By Steve Cook, John Daniels

The authors current a "second-generation" process, which attracts from the easiest of "first-generation" object-oriented research and layout tools. the strategy set out within the ebook, Syntropy, is exclusive within the following methods - cautious differences are drawn approximately what's being modelled and why; all the notations may be accurately with regards to one another; loads of semantic reasoning and checking is feasible; an entire therapy of concurrency is supplied; and strategies for partitioning types are defined. This booklet is designed to equip the reader with a whole set of strategies for construction huge and intricate interactive software program structures. the first graphical notations used are editions of OMT (the Rumbaugh item modelling notation), Harel statecharts, and Booch mechanisms.

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Extra resources for Designing Object Systems: Object-Oriented Modelling with Syntropy

Example text

Implementation models describe the details of software execution in terms of collections of objects communicating by sending messages. Implementation models assume finite processing speed and limited execution resources. Polymorphism is the ability for many different kinds of object to act as servers for a given client. The relationship between clients and servers is called a contract. Design by contract promotes software reuse. Each model is expressed using several different views. Type views and state views are applicable to every model.

Sometimes we want to be rather less precise than this, to say ‘there is an association between these types but I haven’t yet decided on their multiplicity’. We can say that by placing a ?

Many object-oriented design methods have notations consisting of bubbles and lines, and what mainly differentiates the methods is the shape of the bubbles. Many methods simply say that bubbles describe classes, and attributes describe instance variables (data members, in C++ terminology). Indeed, this is a tempting interpretation, because CASE manufacturers can easily generate code templates, one class per bubble, and claim that they have a code generator; it also greatly simplifies the task of producing diagrams from code – a feature which can be readily marketed as ‘reverse engineering’.

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