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Object Oriented Training - Session 4
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hatelove
July 09, 2012
Technology
1
5.1k
Object Oriented Training - Session 4
里氏替換原則、最小知識原則、介面隔離原則、依賴反轉原則
hatelove
July 09, 2012
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Transcript
Trainer: Joey Chen Date: 2012/07/02 Object Oriented Training – Session
4
- 2 - 回顧 – OO三特性 封裝 繼承 多型
- 3 - 回顧 – 抽象 interface abstract
- 4 - 回顧 – SOLID S • 單一職責原則 O
• 開放封閉原則 L I D
SOLID
Liskov Substitution Principle 里氏替換原則
- 7 -
- 8 - Liskov Substitution Principle • 情況 – 當父類行為不符合子類需求,且子類無法
override 時 – 當子類繼承父類,卻無法正常替代父類運作時 • 規範繼承關係 – 確保多型可正常運作
SOLID
Least Knowledge Principle ( Law of Demeter ) 最少知識原則 (
狄米特法則 )
- 11 -
- 12 - Least Knowledge Principle • 規範封裝範圍 • 任何物件對外只開放
– 最少且缺一不可的資訊
SOLID
Interface Segregation Principle 介面隔離原則
- 15 - 哪一個方便使用
- 16 - Interface Segregation Principle • 介面的單一職責 – 介面也應該內聚,避免出現「胖」介面
• 規範依賴程度 – 一個物件對另一個物件的依賴,應建立在最小的介面上 – 不要強迫依賴了沒使用的方法,這是種介面污染 胖
SOLID
Dependency Inversion Principle 依賴反轉原則
- 19 - Dependency Inversion Principle • 依賴於抽象 • 高層模組不依賴於底層模組
– 都依賴於抽象
- 20 - 依賴於介面
- 21 - 結論 S O L L I D
- 22 - 回顧
- 23 - 作業 – 幫DAO穿衣服 • 原本需求 – Product資料異動時,需記錄log,查詢不用
– 對Product進行CRUD時,需檢查權限 • 重構需求 – 將權限驗證與log相關職責,從ProductDao獨立出來 – 讓ProductDao只處理CRUD的需求 • 需求異動 – 在測試環境時,不檢查權限與不記錄log – 檢查測試環境條件,請使用Context.IsTestEnvironment
- 24 - 原始程式 class diagram
- 25 - 重構的 class diagram
Thanks for your listening Q & A