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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418
11
章 メッセージ通信と統合
$ node replier
$ node requestor
リクエスタが処理のセットをパブリッシュし、それをリプライアが受け取って次にレスポンスを送り
返していることが確認できます。
今度は別の実験をしましょう。リプライアが初めて起動したときに永続キューを生成します。これは、
ここでリプライアを終了させてからリプライアを再び起動してもリクエストが失われないということで
す。すべてのメッセージが、リプライアが再び起動されるまでキューに保管されるのです。
AMQP
を使うだけで得られるもうひとつの優れた点は、リプライアが最初からスケーラブルである
ことです。これを確かめるには、リプライアのインスタンスを
2
つ以上起動して、それらの間でリクエ
ストが負荷分散される様子を見ればよいのです。これができるのは、リクエスタが起動するごとに同一
の永続キューにリスナーとしてアタッチし、その結果、ブローカがキューのすべてのコン
シューマ間で
メッセージを負荷分散するためです（競合コンシューマ・パターン）。
ØMQ
にはリクエスト
/
リプライ・パターンの実装用に一対のソケット（
REQ
/
REP
）があり
ますが、これらは同期的です（一度に
1
回だけの「リクエスト
/
レスポンス」）。より複雑
なリクエスト
/
リプライ・パターンは、より高度な手法を使って実装できます。詳しく
は公式ガイドを参照してください
−
http://zguide.zeromq.org/page:all#advanced-
request-r ...
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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.