Component level design in software engineering

Pressman Software Engineering Resources: Component-Level Design Home About Us Products Process Models SE Resources Commentary Contact us Breaking News! A new blog ... visit A new edition ... the 7th edition of A new book ... Roger Pressman and David Lowe on A first novel ... Roger Pressman's first novel is a technothriller -- A new curriculum! RSP&A has partnered with QAI to develop a comprehensive Internet-based A redesigned site! ... we've done a major redesign and added many new features Software Engineering Resources Component-Level Design Data, architectural, and interface design must be translated into operational software. To accomplish this, the design must be represented at a level of abstraction that is close to code. Component-level design establishes the algorithmic detail required to manipulate data structures, effect communication between software components via their interfaces, and implement the processing algorithms allocated to each component. Three resource topics are considered: Component-Level Design Concepts Object Constraint Language Structured Programming Component-Level Design Concepts General Principles of Component Design A collection of design principles provided by Microsoft. Essential Properties (or Characteristics) of Software Components The fundamental characteristics of effective components. Software Component Design A discussion of preconditions, tasks and work products. Component Design Guidelines A set of simple guidelines for the design...

While other UML diagrams, which describe the functionality of a system, component diagrams are used to model the components that help make those functionalities. In this component diagram tutorial, we will look at what a component diagram is, component diagram symbols, and how to draw one. You can use a What is Component Diagram Component diagrams are used to visualize the organization of system components and the The components can be a software component such as a database or user interface; or a hardware component such as a circuit, microchip or device; or a business unit such as supplier, payroll or shipping. Component diagrams • Are used in Component-Based-Development to describe systems with Service-Oriented-Architecture • Show the structure of the code itself • Can be used to focus on the relationship between components while hiding specification detail • Help communicate and explain the functions of the system being built to stakeholders Component Diagram Symbols We have explained below the common component diagram notations that are used to draw a component diagram. Component There are three ways the component symbol can be used. 1)Rectangle with the component stereotype (the text >). The component stereotype is usually used above the component name to avoid confusing the shape with a class icon. 2)Rectangle with the component icon in the top right corner and the name of the component. 3)Rectangle with the component icon and the component stereotype. Provided Inte...

Boundaries illustrate when elements in a system are no longer physically located together. Data leaving a workstation and going out to the internet, a server that backs up to a cloud, or an email that travels from an internal mail server to an external recipient are examples of data crossing a boundary. When boundaries are added to your smart appliance diagram, it should now look something like this: The second step adds boundaries and containers where the components reside. Again, much of the power inherent in a component diagram is found in the way it maps out the communication, inputs, and outputs of actors and components. In a component diagram, interfaces often represent when an input is translated or coded before being sent on to the next component in the path. In the smart refrigerator, interfaces include:

– Introduction – The software component – Designing class-based components – Designing conventional components Introduction Background • Component-level design occurs after the first iteration of the architectural design • It strives to create a design model from the analysis and architectural models – The translation can open the door to subtle errors that are difficult to find and correct later – “Effective programmers should not waste their time debugging – they should not introduce bugs to start with.” Edsgar Dijkstra • A component-level design can be represented using some intermediate representation (e.g. graphical, tabular, or text-based) that can be translated into source code • The design of data structures, interfaces, and algorithms should conform to well-established guidelines to help us avoid the introduction of errors The Software Component 5 Defined • A software component is a modular building block for computer software – It is a modular, deployable, and replaceable part of a system that encapsulates implementation and exposes a set of interfaces • A component communicates and collaborates with – Other components – Entities outside the boundaries of the system • Three different views of a component – An object-oriented view – A conventional view – A process-related view 6 Object-oriented View • A component is viewed as a set of one or more collaborating classes • Each problem domain (i.e., analysis) class and infrastructure (i.e., design) class is elaborate...