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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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.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.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.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.
370
10
章 スケーラビリティとアーキテクチャ
見てわかるように、「チェックアウト」用サービスのクライアントはフロントエンド用アプリケーショ
ンですが、他のサービスとの統合を明示的に実行する必要はまったくありません。精算を完了して顧
客から支払いを受けるには
checkoutService/pay
を呼び出すだけでよいのです。統合の作業はバッ
クグラウンドで行われます。
1.
「ストアのフロントエンド」が「チェックアウト」用サービスの操作
checkoutService/pay
を呼
び出す
2.
操作が完了すると、「チェックアウト」用サービスはイベントを生成し、操作の詳細としてカート
の
ID
（
cartId
）と購入された製品のリスト（
products
）を付加する。イベントはメッセージブロー
カにパブリッシュされる。この時点で、「チェックアウト」用サービスは誰がメッセージを受け取
ることになるのか知らない
3.
「カート」用サービスはブローカをサブスクライブしている
ので、「チェックアウト」用サービスが
パブリッシュしたイベント
purchased
を受け取ることになる。「カート」用サービスはメッセージ
に反応し、メッセージに入っている
ID
により特定したカートをデータベースから消去する
4.
「製品」用サービスもメッセージブローカに対してサブスクライブしているので、同じイベント
purchased
を受け取る。新しい情報に基づいてデータベースを更新し、メッセージに含まれる
製品の在庫数を調整する
すべての過程が、オーケスト
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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.