February 2014
Intermediate to advanced
248 pages
4h 23m
Japanese
Content preview from 実践 Vagrant
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119
7.3 プラグインの開発の基本
し、終了ステータスコードを
1
にしてコマンドの実行を終えます。
他の例外が起きた場合には、
Vagrant
は完全なスタックトレースを付けて
「
unexpected error
」を報告します。
Vagrant
のエラーメッセージは、ユーザーに対
してこれをバグと見なすように伝えるので、開発者はできる限り組み込みのエラー処
理のメカニズムを利用するべきです。
以下に、適切なエラーの報告方法の例を示します。初めに、どこかでそのエラーの
ための例外クラスを定義します。
class MyException < Vagrant::Errors::VagrantError
error_message("Something bad happened!")
end
続いて、どこかでそのエラーを発生させます。
raise MyException
こうすることで、
Vagrant
はこの例外が起きたときに、赤い文字で「
Something
bad happened!
」と出力し、終了ステータス
1
で処理を終えます。
エラーには、値を含めておくことができます。これは、エラーメッセージにデータ
を入れたいときに便利です。エラーの定義の例を以下に示します。
class MyException < Vagrant::Errors::VagrantError
error_message("An error happened with '%{thing}'")
end
そして、例外が生じたときに追加の値を送ることができます。送られた値は、最終 ...
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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.