Автоудаление отладочных свойств и объектов
Как правило, в нашем коде есть отладочные вызовы.
Например:
console.info("created "+object)
Или даже такие:
my.ajax.debugSend(message)
Google Closure Compiler позволяет удалять такие вызовы из production-кода. Здесь вопрос даже не столько в размере кода и в быстродействии, как в удобстве. Как правило, никому не нужны вызовы console.debug на боевом сервере.
Для этого можно добавить флаги, устанавливающие несколько недокументированных внутренних опций.
- --strip_types
- Типы, которые будут удалены. Например, "--strip_types console" приведет к удалению всех вызовов вида "console.*":
console.log, console.debug и т.п.
- --strip_name_prefixes
- Удаляет все вызовы, которые начинаются с указанной строки. Например, "--strip_name_prefixes debug" приведет к удалению вызовов вида "debug*" для любых объектов.
В частности, удалятся console.debug(..), my.debugMethod(..).
- --strip_name_suffixes
- Аналогично
--strip_name_prefixes, но вызовы должны заканчиваться на строку.
- --strip_type_prefixes
- То же самое, что
--strip_types, но проверяет не точное совпадение названия типа, а его начало.
Например:
/** @constructor */
function Animal(name, speed) {
my.ajax.debugSend(name)
console.info("created animal "+name)
this.name = name
this.speed = speed
}
После запуска с флагами:
--strip_types console --strip_name_prefixes debug
Останется:
function Animal(a, b) {
this.name = a;
this.speed = b
}
Чтобы подключить эту опцию, необходимо добавить соответствующие флаги компилятору:
@FlagSpec(help = "Specify stripTypes. You can include multiple.")
private static final Flag<List<String>> FLAG_strip_types
= Flag.stringCollector();
@FlagSpec(help = "Specify stripTypePrefixes. You can include multiple.")
public static final Flag<List<String>> FLAG_strip_type_prefixes = Flag.stringCollector();
@FlagSpec(help = "Specify stripTypeSuffixes. You can include multiple.")
private static final Flag<List<String>> FLAG_strip_name_suffixes
= Flag.stringCollector();
@FlagSpec(help = "Specify stripNamePrefixes. You can include multiple.")
private static final Flag<List<String>> FLAG_strip_name_prefixes
= Flag.stringCollector();
Здесь использован тип флагов stringCollector. Он допускает многократное указание одного и того же флага и собирает значения в список:
--strip_types console --strip_types debug ....
В опции компилятора добавим значения из флагов.
options.stripTypes = new HashSet<String>(FLAG_strip_types.get());
options.stripTypePrefixes = new HashSet<String>(FLAG_strip_type_prefixes.get());
options.stripNameSuffixes = new HashSet<String>(FLAG_strip_name_suffixes.get());
options.stripNamePrefixes = new HashSet<String>(FLAG_strip_name_prefixes.get());
Эти опции запускают встроенный проход компилятора, который удаляет символы, подпадающие под strip-флаги.
Готовый файл MyCompilerRunner.java с этими опциями вы можете увидеть в конце статьи Использование внутренних опций и собственные флаги.
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Подскажите чем еще(какие инструменеты), кроме Google Closure Compiler, можно убрать отладочный код?
С Closure Compiler проблема, что он обновился и убраны флаги com.google.common.flags.Flag. Та и не все js разработчики знают java.
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Such calls should be removed from production code, according to dordle you. The issue here isn't so much about code size and performance as it is about convenience. On the production server, no one usually needs to use console.debug.
Свойства отладки и объекты отладки используются для отслеживания проблем в вашем drift hunters приложении. Они также называются отслеживаемыми свойствами и отслеживаемыми объектами, что означает, что их можно отследить до исходного кода. Это полезно для отладки проблем в самом приложении или даже в других приложениях.
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Google Closure Compiler allows you to remove such calls from production code.
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