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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031
1
アーキテクチャの重要性
1.3
巨大な泥団子
実用的なソフトウェアは複雑な構造物であり、その規模が大きくなる
につれて複雑度は増していきます。一本のプログラムにすべての処理を
記述するのは実質不可能なので、複数の構成要素に処理を分割します。
構成要素の単位は採用するプログラミング言語により異なりますが、オ
ブジェクト指向言語であればクラスの単位に分割します。
分割した構成要素の間には何らかの関係が生じます。たとえば図
1.3.1はUMLのクラス図の例ですが、「一般会員」は「会員」の一種であ
るという継承の関係や、「会員」は配送先として「住所」を持つという関
係があることを読み取ることができます。また、矩形で表現されたクラ
ス同士を結ぶ関連線の矢印の方向に沿って依存関係があります。
⹅
図1.3.1
UMLのクラス図
1
配送先
会員
一般会員
プレミアム
会員
住所
さて、ソフトウェアの構成要素の数が多ければ多いほど、依存関係の
数も多くなり全体としてより複雑になることは想像に難くないでしょ
う。何も考えずに無闇矢鱈に分割を進めていくと、図1.3.2のように構
成要素同士の依存関係が複雑に入り組んだ、「巨大な泥団子（Big Ball
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.