アプリケーションでエラーが発生した場合、このエラーを処理するための正反対のアプローチが2つあります。
許して！ アプローチ：アプリケーションは引き続き実行され、エラーの結果を最小限に抑えようとします。
早く失敗する！ アプローチ：アプリケーションはすぐに動作を停止し、エラーを報告します。
- どのアプローチが良いですか？
- アプリケーションにどのアプローチを実装する必要がありますか？
これらの質問に答えるために、簡単な例を見てみましょう。
噴水の横にある水が汚染されているという警告を表示する簡単なWebページを作成する必要があるとします。
次のHTMLがこのタスクを実行します。
<html> <body> <h2 style="color:red;">Important!</h2> <p>Please <b>DO NOT</b> drink this water!</p> </body> </html>
ブラウザでのこのコードの結果は次のようになります。
ここで、HTMLコード内で小さな間違いを犯します。
タグの代わりに、タグを使用します
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
? ?
. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
. <b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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, Forgive! . , " ?"
, . , , .
:
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- Fail fast!, . , , , (", ... abc.tmp"), .
:
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var table_row_index = 1 ... table_row_indx = table_row_index + 1
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DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
. <b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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, - . , " " . , Mariner 1 - " ". List of software bugs .
, Forgive! . , " ?"
, . , , .
:
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:
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- Fail fast!, . , , , (", ... abc.tmp"), .
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, - , Fail fast! . , Fail fast! , . , , :
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-
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
.<b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
: Forgive! !
, - . , " " . , Mariner 1 - " ". List of software bugs .
, Forgive! . , " ?"
, . , , .
:
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. , , . , Fail fast! , . - . Forgive! " ".
- Fail fast!, . , , , (", ... abc.tmp"), .
:
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- , .
6 - , :
, , , " ", .
, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1
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, - .
-
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
.<b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
: Forgive! !
, - . , " " . , Mariner 1 - " ". List of software bugs .
, Forgive! . , " ?"
, . , , .
:
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:
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- , .
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DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
. <b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
: Forgive! !
, - . , " " . , Mariner 1 - " ". List of software bugs .
, Forgive! . , " ?"
, . , , .
:
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:
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, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .
. , , . , Fail fast! , . - . Forgive! " ".
- Fail fast!, . , , , (", ... abc.tmp"), .
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- , .
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:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
. <b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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, Forgive! . , " ?"
, . , , .
:
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- Fail fast!, . , , , (", ... abc.tmp"), .
:
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Rule of Repair The Art of Unix Programming , :
- , .
6 - , :
, , , " ", .
, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1
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DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
. <b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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, - . , " " . , Mariner 1 - " ". List of software bugs .
, Forgive! . , " ?"
, . , , .
:
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, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .
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- Fail fast!, . , , , (", ... abc.tmp"), .
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Rule of Repair The Art of Unix Programming , :
- , .
6 - , :
, , , " ", .
, - , Fail fast! . , Fail fast! , . , , :
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, - .
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
.<b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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- , .
6 - , :
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DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
. <b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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, - . , " " . , Mariner 1 - " ". List of software bugs .
, Forgive! . , " ?"
, . , , .
:
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:
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Rule of Repair The Art of Unix Programming , :
- , .
6 - , :
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DO NOT, :
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:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
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.<b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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, - . , " " . , Mariner 1 - " ". List of software bugs .
, Forgive! . , " ?"
, . , , .
:
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:
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, , . , ---. , Fail fast! . , , , , . "", . , . "" " ". Fail fast! .
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6 - , :
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var table_row_index = 1 ... table_row_indx = table_row_index + 1
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DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
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. <b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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, . , , .
:
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Rule of Repair The Art of Unix Programming , :
- , .
6 - , :
, , , " ", .
, - , Fail fast! . , Fail fast! , . , , :
var table_row_index = 1 ... table_row_indx = table_row_index + 1
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DO NOT, :
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:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
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.<b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
:
! , , . . , , -.
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-
DO NOT, :
<p>Please <b>DO NOT<b> drink this water!</p>
:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
: Forgive! !
.<b
DO NOT, :
<p>Please <b DO NOT</b> drink this water!</p>
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, - . , " " . , Mariner 1 - " ". List of software bugs .
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:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
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DO NOT, :
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:
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DO NOT, :
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:
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
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DO NOT, :
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
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.<b
DO NOT, :
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
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. HTML- . Firefox, Google Chrome, Internet Explorer, Opera Safari :
, Forgive!, . , , . . !
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