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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11.2
パブリッシュ
/
サブスクライブ（
pub/sub
）パターン
379
●
単一点の障害で全体が停止する事態を防ぐ
●
ブローカは規模の変化に対応しなければならないが、ピアツーピア型アーキテクチャの場合は個
別のノードを対応させるだけで済む
●
仲介なしのメッセージ交換により伝送の遅延を大幅に削減できる
ピアツーピア型メッセージ通信システムを実装する場合、特定の技術やプロトコル、アーキテクチャ
に縛られることがないため、遥かに大きな柔軟性とパワーも手に入れられます。メッセージ通信シス
テム構築用の低レベルライブラリである
ØMQ
（
http://zeromq.org
）の普及は、独自のピアツーピア型
またはハイブリッド型のアーキテクチャを構築することで柔軟性が得られることを見事に実証していま
す。
11.2
パブリッシュ
/
サブスクライブ（
pub/sub
）パターン
パブリッシュ
/
サブスクライブ（
pub/sub
と略記されることも多い）は、おそらくもっとも知られた一
方向メッセージ通信のパターンです。これは分散オブザーバパターンに他ならないので、お馴染みの
はずです。
Observer
の場合と同じく、特定カテゴリのメッセージの受信を希望して登録を行ったもの
が「サブスクライバ（
subscriber
）」です。他方、「パブリッシャ（
publisher
）」は該当サブスクライバすべ
てに配信するメッセージを生成します。図11-6に、
pub/sub
パターンの主な
2
つの型を示します。左が
ピアツーピア型、右が通信を仲介するブローカ
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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.