July 2024
Beginner to intermediate
272 pages
5h 40m
Japanese
Content preview from アーキテクトの教科書 価値を生むソフトウェアのアーキテクチャ構築
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073
2
下位へ依存することにより、下位の変更の影響を受けてしまうことを避
けたいというのがDIPの動機になります。
DIPを適用してコンポーネントの分割、配置を行うと図2.3.5のよう
になります。
⹅
図2.3.5
DIP適用後のクラス図
Upper
Lower
OvertimePayCalculator
<<interface>>
OvertimePayPolicy
RegularGrade
OvertimePayPolicy
ManagerGrade
OvertimePayPolicy
ポイントは、
OvertimePayPolicy
を上位のコンポーネント側に配置し
たことです。これにより、コンポーネント間の依存関係の方向は下位か
ら上位へと逆転しました。このようにすると、上位のコンポーネントは
下位のコンポーネントの存在を一切意識することなく、独立して開発や
テストを進めることができるようになります。この考え方は、クリーン
アーキテクチャやヘキサゴナルアーキテクチャというアプリケーション
アーキテクチャの基礎となっています。
プラクティス
書籍『レガシーコードからの脱却 ソフトウェアの寿命を延ばし価値
を高める9つのプラクティス』
※8
では、設計原則に従いコードの品質を
高めるための方法としてプラクティスに従うことを推奨しています。同
書でプラクティスは以下のように定義されています。
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.