Method: Logger#initialize

Defined in:

lib/logger.rb

#initialize(logdev, shift_age = 0, shift_size = 1048576, level: DEBUG, progname: nil, formatter: nil, datetime_format: nil, binmode: false, shift_period_suffix: '%Y%m%d') ⇒ Logger

:call-seq:

Logger.new(logdev, shift_age = 0, shift_size = 1048576, **options)

With the single argument logdev, returns a new logger with all default options:

Logger.new('t.log') # => #<Logger:0x000001e685dc6ac8>

Argument logdev must be one of:

• A string filepath: entries are to be written to the file at that path; if the file at that path exists, new entries are appended.

• An IO stream (typically $stdout, $stderr. or an open file): entries are to be written to the given stream.

• nil or File::NULL: no entries are to be written.

Examples:

Logger.new('t.log')
Logger.new($stdout)

The keyword options are:

• level: sets the log level; default value is Logger::DEBUG. See Log Level:

  Logger.new('t.log', level: Logger::ERROR)
  

• progname: sets the default program name; default is nil. See Program Name:

  Logger.new('t.log', progname: 'mung')
  

• formatter: sets the entry formatter; default is nil. See formatter=.

• datetime_format: sets the format for entry timestamp; default is nil. See #datetime_format=.

• binmode: sets whether the logger writes in binary mode; default is false.

• shift_period_suffix: sets the format for the filename suffix for periodic log file rotation; default is '%Y%m%d'. See Periodic Rotation.

# File 'lib/logger.rb', line 577

def initialize(logdev, shift_age = 0, shift_size = 1048576, level: DEBUG,
               progname: nil, formatter: nil, datetime_format: nil,
               binmode: false, shift_period_suffix: '%Y%m%d')
  self.level = level
  self.progname = progname
  @default_formatter = Formatter.new
  self.datetime_format = datetime_format
  self.formatter = formatter
  @logdev = nil
  if logdev && logdev != File::NULL
    @logdev = LogDevice.new(logdev, shift_age: shift_age,
      shift_size: shift_size,
      shift_period_suffix: shift_period_suffix,
      binmode: binmode)
  end
end