Traditional Component Design for WebApp Functional Components
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Questions and Answers

What is a key difference between traditional components and object-oriented (OO) components?

  • Traditional components do not define data structures, unlike OO components.
  • Traditional components are not governed by algorithm design principles like OO components.
  • Traditional components focus on data structures, while OO components focus on functions.
  • Traditional components encapsulate data differently than OO components. (correct)
  • In traditional component-level design, what governs the design of processing logic?

  • Functionality provided by the software.
  • Data structures defined by the data model.
  • Interactions with other components.
  • Basic principles of algorithm design. (correct)
  • What is a benefit of Component-Based Software Engineering (CBSE) mentioned in the text?

  • Increased lead time for building applications.
  • Lower return on investment compared to traditional development.
  • Limited quality enhancements in applications.
  • Reduced costs by purchasing components rather than developing in-house. (correct)
  • How does Component-Based Software Engineering (CBSE) contribute to leveraging costs?

    <p>By reusing components across multiple projects.</p> Signup and view all the answers

    What guides the design of interfaces in traditional component-level design?

    <p>Collaborations that a component must effect.</p> Signup and view all the answers

    What determines whether commercial off-the-shelf (COTS) components are suitable for implementation in Component-Based Software Engineering (CBSE)?

    <p>The compatibility of component interfaces within the system architecture.</p> Signup and view all the answers

    What is a component according to the Object Management Group (OMG) Unified Modeling Language Specification?

    <p>A deployable part of a system encapsulating implementation and exposing interfaces.</p> Signup and view all the answers

    What does component-level design in software engineering focus on?

    <p>Defining the characteristics and communication of each software component.</p> Signup and view all the answers

    In traditional component design, what does a component typically contain?

    <p>Processing logic and internal data structures.</p> Signup and view all the answers

    How does the Object Management Group (OMG) view a component in terms of software engineering?

    <p>As a part of the system that encapsulates implementation and exposes interfaces.</p> Signup and view all the answers

    What is the primary focus of component-based software engineering?

    <p>Building systems using pre-built software components.</p> Signup and view all the answers

    What aspect is NOT represented at the level of abstraction during architectural design?

    <p>Internal data structures of components.</p> Signup and view all the answers

    What is one of the risks associated with component selection in component-based applications?

    <p>Difficulty predicting component behavior for black-box components</p> Signup and view all the answers

    Which risk is associated with quality in component-based applications?

    <p>Impacts on system safety, performance, and reliability</p> Signup and view all the answers

    What can be a consequence of failing to document changes when refactoring components?

    <p>Increased technical debt</p> Signup and view all the answers

    Which statement best describes the challenge with convincing management to refactor components?

    <p>Hard to justify resources on fixing working components</p> Signup and view all the answers

    What is a common issue related to component integration risks in component-based software engineering?

    <p>Lack of standards for component interoperability</p> Signup and view all the answers

    How can security risks manifest in a system using components?

    <p>Unintended system use and vulnerabilities from untested combinations</p> Signup and view all the answers

    Study Notes

    Component-Based Software Engineering (CBSE)

    • CBSE involves designing and constructing WebApp functional components identical to software components for conventional software.
    • Traditional components focus on functions and data structures, whereas OO components encapsulate data.

    Traditional Component Design

    • Design of processing logic is governed by the principles of algorithm design and structured programming.
    • Design of data structures is defined by the data model developed for the system.
    • Design of interfaces is governed by the collaborations that a component must effect.

    Component-Based Software Engineering (CBSE) Benefits

    • Reduced lead time: building complete applications from a pool of existing components is faster.
    • Greater return on investment (ROI): purchasing components can be more cost-effective than redeveloping the same functionality in-house.
    • Leveraged costs of developing components: reusing components in multiple applications allows costs to be spread over multiple projects.
    • Enhanced quality: using existing components can improve overall system quality.

    Component Level

    • Component-level design defines the data structure, algorithm, interface, characteristics, and communication to each software component.
    • A complete set of software components is defined during architectural design.

    Component Definition

    • According to the Object Management Group (OMG) Unified Modeling Language Specification, a component is a modular, deployable, and replaceable part of a system that encapsulates implementation and exposes a set of interfaces.
    • An object-oriented view of a component contains a set of collaborating classes.
    • A traditional view of a component contains processing logic, internal data structures, and an interface.
    • A process-related view of a component involves building systems out of reusable software components or design patterns selected from a catalogue.

    Component Diagram

    • A component diagram breaks down the actual system under development into various high levels of functionality.
    • Components are reused and tested in many different applications.
    • Maintenance of component-based applications involves replacing obsolete components with new or enhanced components.

    CBSE Risks

    • Component selection risks: predicting component behavior for black-box components or poor mapping of user requirements to component architectural design.
    • Component integration risks: lack of interoperability standards between components.
    • Quality risks: unknown design assumptions made for components, affecting system safety, performance, and reliability.
    • Security risks: system vulnerabilities caused by integrating components in untested combinations.
    • System evolution risks: updated components may be incompatible with user requirements or contain additional undocumented features.

    Component Refactoring

    • Refactoring components to improve quality is a good practice, but it can be challenging to convince management to expend resources on it.
    • Changing software without documenting changes can lead to increasing technical debt.

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    Description

    Learn about designing and constructing traditional components for WebApp functional components following the principles of software architecture. Understand the differences between traditional components and object-oriented components.

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