Lecture #22 - Interface Segregation Principle

Web Resources:

Content:

1. Syllabus
   Describes topics to be covered, reading material for you to digest before coming to class, and due dates for the assigned projects.

2. Projects:

   Project #3 - Code Publisher Client Project3HelpS2019 - includes:
   Client-Channel-Server Diagram
   Diagram showing use ofC++\CLI translater between WPF (C#) GUI and C++ Comm Channel. Prototype GUI for Project #3
   Demonstrating Requirements with a GUI
   The projects, below, are intended to help with Project #4. They are included so we can peek ahead to see where we need to go with Project #4. Project4Help WPF
   Illustrates techniques used for WPF to use Comm via C++\CLI. Prototype GUI for Project #3
   Uses C++\CLI translator to interoperate with C++ Comm to navigate a remote directory tree.
   Project #4 - Remote Code Page Management Project4HelpS2019 - includes: Communication Channel Structure
   Diagrams that show how asynchronous message passing communication works. Communication Channel Class Diagram
   Class diagram of our protype communication channel. Communication Channel Activities
   Activity diagram showing message flow through the communcation channel. CppCommWithFileXfer - Communication Channel Code
   Here's code you can use to implement message-passing communication. Project4HelpWPF code demo
   A getting-started GUI prototype that shows one way to build a client for Project #4. C++ Repository with WPF GUI - code demo
   This demo illustrates use of User Controls as well as remote directory navigation.

3. Project #2 Grades

   Project #2 Grades Chart

4. Components:

   A Component is code focused on one particular activity, accessed only through an interface and an object factory, and implemented as a dynamic link library. You can find more detail about components here. ComponentRefCount:
   Components are often shared, using reference counting to destroy the components when all users have finished. You can implement reference counting with std::shared_ptr. If you want to build reference counting into the component you may use this ComponentRefCount package as an example. Singleton:
   Singletons provide global access to a shared instance of some type. The Singleton template class provides this in a reference counted implementation.

5. Principles

   Liskov Substitution Principle
   This is a fundamental OOD principle, with some surprising subtleties when using C++. Open/Closed Principle
   Another fundamental OOD principle that argues for using inheritance "hooks" and template-based classes. The Dependency Inversion Principle
   Components should depend on abstractions, not other components.
   Classic Factory structure, Classic Factory creating polymorphic objects
   Illustrates how to create instances of a polymorphic type with clients knowing only the base class and factory interfaces. Object Factory Structure, Object Factory Project
   This project implements a factory that allows clients to use derived classes but only bind to their abstractions. It also demonstrates the use of products with multiple interfaces. Extensible Object Factory Structure, Programming to Interface Project
   This project implements a template-based "pluggable object factory" and shows how to access members of a hierarchy through an interface. Programming to Interfaces Presentation
   Discusses interfaces, layers, factories, and breaking design, compile, and static link dependencies. MakeDLL Structure, MakeDLL: Dynamic Link Library Project
   This project demonstrates that compile and static link dependencies can be broken by programming to interfaces and using object factories. DLL_ProtocolDemo Project
   Demonstrates how Dynamic Link Libraries are loaded implicitly and explicitly.
   Interface Segregation Principle
   Discusses why you may need to provide more than one interface for a component.
6. Invocations Revisited - added more capture examples
7. Run-Time Type Indentification Presentation
   RTTI is, perhaps, the antithesis of the Open/Closed Principle. Paradoxically, I used it building the trace class.
8. Exceptions Presentation
9. Basic Exceptions Demo
10. Standard Exceptions Demo
11. Exception Performance Demo

12. Thinking about Software Design:

    Software Design Blog
    Summary of fundamental ideas. Object Oriented Design Blog
    Essential features of Object Oriented Design. Software Design Principles
    SRP, LSP, OCP, DIP, and ISP Software Design, ppt
    Broad survey of ideas with examples Design Strategies, pptx
    Summarizes design issues for modules and classes. Design Guidelines, pptx
    Design rules and idioms that transcend Object Oriented Design.
13. Common C++ Problems, pptx
14. Fragile Designs, pptx