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  • log4erl API

    https://github.com/ahmednawras/log4erl/blob/master/API.txt

    NOTE:
    =====
    Please be informed that the API below as of now is not stable and any of the functions/parameters below
    may be changed without prior notice.

    Furthermore, you can find appenders and their configurations in 'Appenders_API.txt' file included in release.

    **> log4erl:conf(File) -> ok | {error, E}
    File :: string()

    File is the name of the configuration file. Please check CONFIGURATION.txt for the format of this file.

    **> log4erl:add_logger(Name) -> ok | {error, E}
    Name :: atom() name of the logger

    Example:
    log4erl:add_logger(chat_logger)
    This will create a new logger with name 'chat_logger"

    **> log4erl:change_log_level(Level) -> ok
    log4erl:change_log_level(Logger, Level) -> ok
    Level::atom() = {all, debug, info, error, warn, fatal, none}
    Logger::atom()

    This will change log level for default logger or named logger to the level
    specified.

    Example:
    log4erl:change_log_level(info). %% This will change level of default logger to info
    log4erl:change_log_level(test_log, warn) %% This will change level of test_log logger to warn

    **> log4erl:change_level(Appender, Level) -> ok
    log4erl:change_level(Logger, Appender, Level) -> ok
    Logger :: atom()
    Appender :: atom()
    Level :: atom()

    @since version 0.8.4

    This will change log level for a specific appender, as opposed to change_log_level/2,3 which changes
    level for all appenders in a logger.

    Example:
    log4erl:change_level(appender1, all).

    **> log4erl:change_format(Appender, Format) -> ok
    log4erl:change_format(Logger, Appender, Format) -> ok
    Appender :: atom()
    Logger :: atom()
    Format :: string()

    @since version 0.8.3

    This will change the output format to the specified Format. Format is a pattern string similar to
    PatternLayout in Log4j. patterns is an arbitrary string with specifiers (proceeded by '%').
    Possible specifiers are below:
    d - output date (2008-3-7)
    j - output date (2008-03-07)
    t - time (2:13:9)
    T - time (02:28:01.811637)
    y - year in YY format (08)
    Y - year in YYYY format (2008)
    M - month (2)
    b - short name of month (Feb)
    B - long name of month (February)
    D - day
    h - hour
    m - minute
    s - second
    i - milli-seconds
    l - the actual log message
    I - ISO format with universal GMT time (equivilant to "%jT%TZ").
    S - ISO format with local time and time zone offset
    Z - timezone (+04:00)
    L - log level
    n - new line
    % - the percentage sign (%)

    Example:
    log4erl:change_format(file1, "%j %T [%L] %l%n").
    Will result in the following output (on log4erl:warn("hello"))

    27-10-2008 15:28:59,98621 [warn] hello

    **> log4erl:log(Level, Log) -> ok
    Level :: atom()
    Log :: string()

    This will log the text Log to the default logger with level Level.

    Example:
    log4erl:log(warn, "Hello there").
    log4erl:log(test_level, "Hello there").

    **> log4erl:log(Level, Log, Data) -> ok
    Level :: atom()
    Log :: string()
    Data :: list()

    This will log the text Log to the default logger with level Level and
    will use Data to format the log text.

    Example:
    log4erl:log(info, "received message ~p", [Msg]).

    **> log4erl:log(Logger, Level, Log, Data) -> ok
    Logger :: atom()
    Level :: atom()
    Log :: string()
    Data :: list()

    This will log the (Log, Data) to Logger with level Level

    Example:
    log4erl:log(chat_log, debug, "user entered chat text: ~p", [Chat]).

    **> log4erl:Level(Log) -> ok
    log4erl:Level(Log, Data) -> ok
    log4erl:Level(Logger, Data) -> ok
    log4erl:Level(Logger, Log, Data) -> ok

    Level :: warn | info | error | fatal | debug
    Logger :: atom()
    Log :: string()
    Data :: list()

    Exmaple:
    log4erl:info("This is an info msg").
    log4erl:warn("Received error ~p",[Msg]).
    log4erl:fatal(chat_log, "exception occured").
    log4erl:debug(chat_log, "message received is ~p", [Msg]).
    log4erl:error("Error").

    **> log4erl:error_logger_handler() -> ok
    log4erl:error_logger_handler(Mappings) -> ok
    where
    Mappings :: [Mapping]
    Mapping :: {Elevels, level}
    ELevels :: error | info_msg | warning_msg | error_report | info_report | warning_report

    Mappings basically is a list of mapping between error_logger log levels and log4erl log levels.
    Currently, report messages are not handled by this error_logger handler. The default Mappings are:
    {error=error, info_msg=info, warning_msg=warn,
    error_report=error, info_report=info,
    warning_report=warn}

    Example:
    log4erl:error_logger_handler([{error, fatal}, {info_msg, info}]).

    which treats all error messages coming from error_logger as fatal and all info_msg
    messages coming from error_logger as info.

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  • 原文地址:https://www.cnblogs.com/fvsfvs123/p/4354216.html
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