February 2014
Intermediate to advanced
248 pages
4h 23m
Japanese
Content preview from 実践 Vagrant
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.
118
7 章 プラグインによる Vagrant の拡張
コンポーネントの定義が要求する厳密な引数と、コンポーネントの実装方法は、そ
れぞれのコンポーネントごとに異なります。この後のセクションでは、それらのコン
ポーネントを順番に見ていきます。
7.3.3
エラー処理
エラー処理は、
Vagrant
で最も賞賛されている機能です。
Vagrant
には、常に守ら
れなければならない安定性に関する原則があり、スタックトレースをユーザーが目に
することがあれば、そのスタックトレースがユーザーのエラーであるかどうかにかか
わらず、それはバグと見なされます。
プラグインもまた、この原則に従うようにしなければなりません。これは、エラー
処理を丁寧に行うためのフレームワークが、
Vagrant
には組み込み済みであることに
よります。
Vagrant
に組み込まれているエラー処理のメカニズムを使えば、エラーメッセージ
は図
7-1
のようになります。
Vagrant
におけるエラー処理は、すべて
Ruby
の例外を発生させることによって
行われます。
Vagrant
では、
Vagrant::Errors::VagrantError
を継承する例外は、
他の例外と異なる扱いを受けます。
VagrantError
を継承している例外については、
vagrant
コマンドがそのエラーのメッセージを赤い文字でうまくコンソールに出力
図
7-1
適切な
Vagrant
のエラーメッセージ
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.