Commentary

簡評三十六

開發人員應遵循的七項持續整合要領

  1. Commit code frequently
    • 有 code change，CI build 出黎嘅野先有意義
  2. Don’t commit broken code
    • 每次建構失敗就代表著專案的健康狀態出了嚴重的問題，必須要立即花費時間與人力去修復
    • 開發人員要對自己送交的程式負起責任，不要因為自己不小心而造成建構失敗
  3. Fix broken builds immediately
    • 零容忍 broken build
    • 如果團隊都沒有人把建構失敗當作一回事，久而久之，持續整合就失去它的作用
  4. Write automated developers tests
    • 有 CI 冇 tests
      • 持續整合頂多做做編譯的工作，無法藉由執行測試案例找出功能錯誤
    • 冇 CI 有 tests
      • 測試案例寫了一堆，但是卻擺在一旁很少執行
      • 不執行測試案例怎麼會知道系統有沒有問出題
  5. All tests and inspections must pass
    • 測試或是inspection（可以想成靜態程式碼檢查）沒有通過，但是程式可以編譯，都唔算成功
  6. Run private builds
    • 在送交程式之前，先執行本地建構
  7. Avoid getting broken code
    • 兩個方法
      1. Pull 之前 check CI
      2. CI 一炒左，叫大家唔好 pull，直至問題解決為止
    • 用 integrate 左 CI 嘅 Github，build fail 根本 merge唔到，唔會出現E個情況

亂談軟體設計（6）：Single Choice Principle

  • Single Choice Principle
    • Whenever a software system must support a set of alternatives, one and only one module in the system should know their exhaustive list
    • 當一個軟體系統必須要支援一組替代方案的時候，系統中應該只有一個模組知道這些替代方案的所有清單
    • 程式中都有一個地方需要去「詳盡列舉（know their exhaustive list）出所有子類別（a set of alternatives）」
      • 減少 duplicated code

除舊佈新 (1)

  • Architecture is not a phase of development
    • 因為軟體開發隨時都在做 architecture design
  • 通常 over design 唯一個好處只是營造一種『自我感覺良好』的假象
    • 爽到 architect ，艱苦到 programmers

消除浪費 (1)：Partially Done Work

  • Spec 係「尚未被實做的需求文件」
    • 都係 partially done work
  • 好多 requirement 會係幾個 sprint 後變得冇效

持續整合樣式：中文補充說明

講 Cross platform software development 嘅 continuous integration pattern 點樣整。

  • 解釋點解D出名 app 嘅 UI 開始相似，同埋解釋咁做嘅好處
  • 新嘅 UI 潮流
    • big, bold headlines with rounded sans-serif fonts
    • minimal black and white interfaces with lots of negative space
    • little to no color.
  • 點解新 UI 潮流偏向簡潔
    • App fatigue
      • get tired of bouncing between too many apps
      • get tired of learning how to use a new interface after every new download
    • More consistency means better usability
      • Consistency means no re-learn
    • Branding isn’t just how it looks, but how it works
      • A differentiated experience is more important than differentiated UI
    • In future, UX design on voice interface (like Siri) is more important than screen interface

How Dictators Hack Our Feelings

  • Fascism
    • My nation is superme
    • Deny other identities
  • Nationalism
    • My nation is unique
  • Data is replacing land and machine as the most important assets
    • Politics is struggle to control the flow of data
    • Dictatorship now means too much data is being concentrated in the hands of government
  • New technology makes dictatorships more efficient than democracies
  • Dictator hack our feelings of feat and hate and vanity
    • Use these feelings to polarize and destory democracy from within

What is the coldest thing in the world?

  • The coldest thing is colder than outer space
  • Use laser to slow down (cold down) atoms
  • Cold atoms can be use as detector

Integration database

  • An integration database is a database which acts as the data store for multiple applications
  • Integration databases should be avoided
    • It is a point of coupling between the applications that access it

從合約判斷類別行為是否相容

  • Liskov Substitution Principle 同 Design By Contract 嘅 Subcontracting 係同一樣野
  • LSP
    • 系統中基本型別（base types）出現的地方，都可以用子型別（ subtypes）來取代，而不會破壞程式原有的行為
  • DBC
    • 子類別的 precondition 需要與父類別的 precondition 進行OR運算
    • 子類別的 postcondition 需要與父類別的 postcondition 進行AND運算
    • 子類別的 invariant 需要與父類別的 invariant 進行AND運算