February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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16
1 章 Web サーバを立てる
cacheAndDeliver
の内容が
fs.stat
のコールバック関数に内包され、
2
つの変数が追加され、
さらに
if(!cache[f])
文が修正されました。
fs.stat
の引数から
ctime
プロパティを抜き出し、
Date.parse
で
Unix
時間に変換し、
lastChanged
変数に割り当てます。
もし、この最終変更日時がキャッシュされた日時よりも新しい場合、
isUpdated
に
true
が割り
当てられます。その後、
if(!cache[f])
の条件文に
isUpdated
を加えて、キャッシュが存在しない
か、もしくはファイルがキャッシュよりも新しい場合に、ファイルからコンテンツを読み込んで
キャッシュするよう動作させます。
レシピ
1.4
ストリーミングによりパフォーマンスを最適化する
レシピ
1.3
ではキャッシュを実装しました。これにより、
2
回目以降のアクセスではコンテンツ
をキャッシュから読み込むことによって、アクセスのたびに直接ハードディスクのファイルを読
むよりもより優れたパフォーマンスを発揮するようになりました。今度は
1
回目のアクセスのパ
フォーマンスを向上させます。
fs.readFile
を使うと、サーバがレスポンスを構築して送信する前に、取得したファイルをメ
モリ上にすべて展開します。より優れたパフォーマンスのために、データをディスクから直接
response
オブジェクトに
pipe
することができます。そうすることにより、データ全体のロードを
待つことなく細切れの状態のままネットワークソケットに送ることができます。 ...
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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.