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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9.2
非同期のバッチ処理とキャッシュの利用
309
リクエストのバッチ処理のパターンは、負荷が高く
API
が遅い場合にもっとも力を発揮し
ます。まさにそのような状況でこそ、非常に多くのリクエストをバッチ処理に含めること
ができるからです。
9.2.3
非同期リクエストのキャッシュ処理
リクエストのバッチ処理パターンの問題のひとつは、
API
が速くなればなるほどバッチ処理できるリ
クエストが減るということです。
API
が既に高速であるならそれを最適化しようとすることに意味がな
いという言い方もできます。しかし、アプリケーションのリソース読み込みに際して
API
はやはり影響
因子であり、「塵も積もれば山となる」恐れがあります。また、
API
呼び出しの結果は頻繁には変わらな
いと仮定できる場合もあります。ですから、単にリクエストをバッチ処理しただけで最良のパフォーマ
ンスを得られるわけではありません。このような状況をすべて考慮すると、アプリケーションの負荷を
減少させ応答性
を高めるのにもっとも有力な候補は、より積極的なキャッシングです。
考え方は単純です。リクエストが完了したらすぐに結果をキャッシュに保存します。キャッシュの
実体はさまざまで、データベースのエントリでも専用のキャッシュサーバでもかまいません。その後、
API
が次に呼び出されたときには、新たにリクエストを発生させなくても結果はキャッシュから瞬時に
取り出せます。
キャッシュ処理の発想は、経験を積んだ開発者にとって目新しいものではありませんが、非同期プ
ログ
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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.