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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11.4
リクエスト
/
リプライ・パターン
409
$ node worker
$ node worker
そして、
collector
モジュールを起動し、
producer
を単語の最大長とハッシュを引数として起動
します。
$ node collector
$ node producer 4 f8e966d1e207d02c44511a58dccff2f5429e9a3b
これで、
AMQP
だけを使ってメッセージパイプラインと競合コンシューマ・パターンを実装できまし
た。
11.4
リクエスト
/
リプライ・パターン
メッセージ通信システムを扱うことは、しばしば一方向の非同期通信を使うことになります。パブ
リッシュ
/
サブスクライブは典型的な例です。
一方向通信は並行性と効率の点で大きな利点がありますが、これ単独で結合と通信における問題を
すべて解決することはできません。ときにはリクエスト
/
リプライ・パターンがちょうど打ってつけの
方
法となる場合もあります。したがって非同期の一方向チャネルしか手もとにない状況では、「リクエ
スト
/
リプライ」方式でメッセージ交換できるようにする抽象化手法を知ることが重要です。それを次
に行います。
11.4.1
相関識別子
最初に取り上げる「リクエスト
/
リプライ」のためのパターンは「相関識別子（
correlation identifier
）」
と呼ばれるもので、一方向チャネルの上にリクエスト
/
リプライ・パターンを構築するための構成要素
です。
このパターンは各リクエストに識別子を付与することと、そ
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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.