May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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7.3
プラグインの接続
233
すべてのモジュールが自動的にインスタンス化され接続されます。
7.2.4.3
DI
コンテナの長所と短所
DI
コンテナは登録されるモジュールが
DI
パターンを使っていることを前提としていますから、長所
と短所も引き継いでいます。具体的に言えば、結合度を低下させテスト可能性を向上させましたが、
その一方で複雑さは増しました。依存関係が実行時に解決されるからです。
DI
コンテナはサービス
ロケータパターンと多くの性質を共有していますが、実際に依存するもの以外の余計なサービスにモ
ジュールを依存させないという事実を利点としてもっています。これは大きな利点で、各モジュールは
DI
コンテナなしでも、単に手作業で注入を行いさえすれば利用できるのです。
それがこの節で示したことの本質でもあります。元来の
DI
パターンを使った認証サーバの旧版を使
い、（モジュール
app
を除いた）コンポーネントの変更なしに、すべての依存関係の注入を自動化でき
たのです。
npm
で、再利用可能な
DI
コンテナが多数見つかります。コードを見ることで新たなア
イ デ ア も 浮 か ぶ で し ょ う
−
https://www.npmjs.org/search?q=dependency%20
injection
7.3
プラグインの接続
ソフトウェアエンジニアにとって夢のようなアーキテクチャといえば、小さな最小限のコアをもち、
プラグインを使って必要に応じて自由に拡張できるものでしょう。残念ながら、これは容易に得られる
とは限 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.