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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376
11
章 メッセージ通信と統合
●
イベントメッセージ
●
ドキュメントメッセージ
11.1.2.1
コマンドメッセージ
「コマンドメッセージ」は既にお馴染みのもので、実質的には
6
章で説明したコマンドオブジェクトを
シリアル化したものです。この種類のメッセージの目的は受信側でのアクションやタスク実行のきっか
けを与えることです。それができるように、このメッセージにはそのタスクの実行に不可欠な情報が含
まれている必要があり、それは通常、その処理の名前と実行時に与える引数のリストです。コマンド
メッセージは、「リモートプロシージャコール（
RPC
）」システム、分散コンピューティング、あるいはもっ
と単純に何らかのデータの要求の実装などに使われます。
RESTful HTTP
呼び出しは単純なコマンド
の例です。各
HTTP
メソッド（動詞）は特定の意味をもち、明確な処理に結びつけられています。
GET
はリソースの取得、
POST
は新規リソースの作成、
PUT
はその更新、
DELETE
はその破棄です。
11.1.2.2
イベントメッセージ
「イベントメッセージ」は何らかの事象の発生を他のコンポーネントに通知するために使われます。こ
のメッセージは通常そのイベントの種類、場合によってはコンテキストやサブジェクト（関わっている
アクター）などの細目も含みます。ウェブ開発では、サーバから通知（データやシステムの状態変化が
発生したことの通知など）をロングポーリングや
WebSocket
で受け取る場合に、ブラウザ内でイベント
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.