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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373
11
章
メッセージ通信と統合
スケーラビリティのキーが「分割」ならば、システムの統合のキーは「再結合」です。前の章では、
apfunction
を分散する方法は接続されたすべての
clientsplication
について反復処理を実行し、それを
数台のマシン上に断片化することであると説明しました。これをうまく機能させるには、それらすべて
のものが何らかの方法で通信する必要があり、したがってそれらを統合（
integrate
）する必要があるの
です。
分散アプリケーションを統合する主な手法は
2
つあります。ひとつは共有ストレージを中央の調整器
兼全情報の保持器として使うもので、もうひとつはメッセージを使ってデータ、イベント、コマンドを
システムの各ノードに行き渡らせるものです。後者は分散システムを拡張する場合に実際に効果を発
揮するものであり、またこの話題をとても面白く、ときには複雑にするものでもあります。
メッセー
ジはソフトウェアシステムのあらゆる階層で使われます。我々はインターネット上で通信す
るためにメッセージを交換し、他のプロセスにパイプで情報を送るためや、アプリケーション内で関数
を直接呼び出す（コマンドパターン）代わりにメッセージを使うこともあります。さらにはデバイスドラ
イバもハードウェアとの通信にメッセージを使います。コンポーネント間、システム間の情報交換の方
法として使われるあらゆる離散的構造化データは「メッセージ」とみなすことができます。しかし分散
アーキテクチャを扱う場合には、「メッセ
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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.