サンドボックス
ActionScriptやJavaScriptからプログラミングの世界に入ると、ときどき不思議な用語に出会う。
ActionScriptのチュートリアルを読んでいた時に登場した「サンドボックス」というのもそんなコトバのひとつ。
幼稚園や公園にある砂場(サンドボックス)がどうしてプログラミング用語になったのかは知らないけど、「保護すべき領域」というイメージ通りの意味で使われている。外部から受け取ったプログラムを保護された領域、「箱」の中に閉じ込めてから動作させたり、「箱」の外へ悪影響が及ぶのを防止するセキュリティモデルのことを指す。
ActionScriptのチュートリアルでは、下記のような一文が頻繁に出てくる。
「このチュートリアルでは、パブリック Web サービスを使用しているので、インターネット接続が必要です。また、チュートリアルはサンドボックスの制限によりブラウザでは動作せず、Flashオーサリングまたはローカル環境で動作します。」
読めばなんとなく意味はわかるけどね。
近所の公園にある砂場は、猫の糞やタバコの吸い殻だらけでサンドボックス制限がまったくかかってないことを考えると、セキュリティの難しさをまさしく例えているわけだな。
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