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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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.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.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.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.
6.9
ミドルウェア
189
テンプレートパターンを使えば、最小限の手間で完全に動作する新たな設定管理モジュールが手に
入ります。親となるテンプレートクラスから継承したロジックとインタフェースが再利用されるので、
少数の抽象メソッドに対し実装を提供するだけでよいのです。
6.8.2
実践での利用
このパターンはどこかで見たような感じがするかもしれません。実は、
5
章で独自ストリームの実装
のためいろいろなストリームクラスを拡張する際に、既に出会っているのです。
5
章の場合、テンプレー
トメソッドとしてメソッド
_write()
、
_read()
、
_transform()
、
_flush()
が、実装したいストリー
ムクラスに応じて選択されました。新しい独自ストリームを作成するには、特定の抽象ストリームクラ
スを継承し、テンプレートメソッドの実装を与える必要がありました。
6.9
ミドルウェア
Node
でもっとも特徴的なパターンの
ひとつは何と言っても「ミドルウェア」です。残念なことに未経
験者、とりわけ企業プログラムの世界出身の開発者にとって、かなりわかりにくいものでもあります。
わかりにくい理由は、おそらくミドルウェアという語の意味と関連があるのだと思います。ミドルウェ
アは企業プログラマーがソフトウェアの構造を言うときに使う専門用語で、
OS API
、ネットワーク通信、
メモリ管理などの低レベル機構を抽象化して開発者がアプリケーションの業務機能だけに集中するこ
とを助けてくれるようなさまざまなソフトウェア群のことを指し
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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.