February 2014
Intermediate to advanced
372 pages
7h
Japanese
Content preview from Backbone.jsアプリケーション開発ガイド
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178
7
章 よくある問題と解決策
イベントアグリゲーターは
fire and forget
（送信したら忘れる）スタイルのコミュニケーション
を可能にします。イベントを発生させるオブジェクトは、サブスクライバーが存在するかどうかに
ついて関知せず、ただイベントを発生させて次の処理に進みます。メディエーターも意思決定にイ
ベントを利用することはありますが、そのスタイルは
fire and forget
ではありません。メディエー
ターは既知の入力や処理内容に注目しており、既知の行為者（オブジェクト）を利用して追加的な
ふるまいを実現しようとします。
7.10.6
両者の関係（いつどちらを使うべきか）
イベントアグリゲーターとメディエーターの類似性と相違点について知ることは、両者の意味を
知る上で重要です。両者の使い分けについて理解しておくことも、同じくらい重要です。
2
つのパ
ターンの意味と意図がわかっていれば、「いつ」の問いには答えられるでしょう。しかし、これら
のパターンを実際に利用した経験があれば、より細かなポイントや微妙な判断についても理解でき
るようになるはずです。
7.10.6.1
イベントアグリゲーターを使うべき場合
一般的に、直接監視したいオブジェクトが多すぎる場合やまったく関係のないオブジェクトが使
われている場合にはイベントアグリゲーターが使われます。
2
つのオブジェクトの間に直接的な関係（親ビューと子ビューなど）がすでにある場合は、イベン
トアグリゲーターを利用するメリットはほとんどないでしょう。子ビューがイベントを発生させれ ...
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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.