By John Cheesman
(Pearson schooling) Applies Unified Modeling Language to the area of part structure, demonstrating the way it can be utilized to specify parts, their interactions and their integration into cohesive structures. can be of curiosity to method architects, designers, programmers, and testers. Softcover.
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Additional info for UML Components: A Simple Process for Specifying Component-Based Software
Example text
The combination of initiating actor and stimulus must be unique across all use cases. The main success scenario describes what happens in the most common case and when nothing goes wrong. It is broken into a number of separate Use Case Steps. The assumption is that the steps are performed strictly sequentially in the order given—unlike most business process languages there is no way of describing parallelism, which is one reason why a use case is typically smaller than a business process. Each use case step acts as a UML use case extension point.
Well, software development is a relatively new discipline in the grand scheme of things. Software engineers haven’t had long to work it all out, so let’s draw on the experience of other human endeavors that have analogous issues and that have stood the test of time. 5 SPECIFYING CONTRACTS thing useful. If we think of a component as a piece of software that provides some sort of service, and requires services of others, we can usefully make an analogy between components and companies. Companies are entities that provide services to their customers (which may be other companies, organizations, or individuals) and that often depend on the services of other companies.
The interface forms the contract with the component client. It tells the client what to expect. 3 summarizes the differences between an interface and a component specification. 6 COMPONENT SYSTEMS Model Levels In this book we talk a lot about models, mostly using UML as our modeling language. We need to be clear on the purpose of these models. Any model of something is a perspective or view—it includes and emphasizes some things and excludes others. That’s the value of a model. For example, a map of a country could highlight political boundaries, geography, geology, transport, industry, population, economics, ecology, and so on.