[Langzixue programming] [Reading Notes]-case analysis of the nature of Tao

Nature of the Tao-object-oriented Practice Guide

• Demand Analysis: pursuing perfection vs. Tolerating Defects

 

• Case Analysis: bottom story vs. Walking in the cloud
  • UML
    • tool
      • express design ideas
      • communication
    • sword in my heart
      • point to end
      • fully express design intent
      • Facilitate correct communication and communication among team members
    • go astray
      • too much emphasis on the use of UML
      • it takes a lot of effort to maintain a complete and meticulous UML version.
  • Case Model
    • User case)
      • Elements
        • Only describe a single task
          • Similar to: it is best to assume only one responsibility for a class.
        • Describe the user's complete intent
          • Including a series of consistent steps
            • For example, a series of steps to achieve successful scenarios
            • For example, a series of steps to achieve failure scenarios
        • Feedback meaningful results
          • Participants interacting with the system
            • End User
            • Peripheral System
          • Reflect functional requirements of software
      • Scenario
        • Result of a single series of actions in the use case
      • Meaning
        • Accurately express software requirements to reduce ambiguity arising from communication and communication
        • Facilitates rational division of software development cycles
          • Determine the priority of the use case
          • Determine the number of use cases for each iteration cycle
        • Driving Continuous software refinement Analysis & Design
          • Improve system design based on continuous improvement of Use Cases
          • Guide code Reconstruction
        • Provide clear test objects for test cases
    • Case Modeling
      • Determine system boundaries
      • Confirm participants
      • List all use cases
      • determine the level of each use case
        • high-level use cases
        • User target-level use cases
          • describes the functions you want to implement
            • business logic layer
            • exclude the interface layer
          • contract between project team and developers
        • sub-function cases
          • extended and refined target-level use cases
          • details
            • polymorphism-like: different classes implement various operations on abstract classes
          • extended
            • call another use case for extended processing in special scenarios
      • use case description
        • rigorous language
        • example
          • high-level use cases
            • Use Case name: Borrow Books
              system scope: Library
              Description: The Reader submits the borrow credential & Title: the system confirms that the book exists and has not been lent out. You can go through the lending procedure
          • User target-level use cases

            • Use Case name: return books
              system scope: entire software and hardware system
              User target: return the last borrowed book
              prerequisites: Bibliography information is recorded on the debit card
              execution process:
              1. Enter the bibliography Information
              2. Check whether the lending is overdue.
              3. Modify the database information.
              extended:
              1. If the borrow term is overdue
              2. Enable the use case of overdue fines
              prerequisites: None

      • Draw a sequence chart with the entire system as the object
        • Draw a sequence chart for the main use case
        • Online operation process from the user perspective
          • The entire system is regarded as a black box and does not care about how to implement it.
          • Observe the order and process of all system information
  • Prodigal Son's post-reading experience
    • Use Case (User case) to reflect the functional requirements of the entire system
    • Describe the actual operating process of the system through the sequence diagram

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