# File lib/logger.rb, line 591
def initialize
  @datetime_format = nil
end

# File lib/logger.rb, line 595
def call(severity, time, progname, msg)
  Format % [severity[0..0], format_datetime(time), $$, severity, progname,
    msg2str(msg)]
end

# File lib/logger.rb, line 602
def format_datetime(time)
  time.strftime(@datetime_format || "%Y-%m-%dT%H:%M:%S.%6N ".freeze)
end

# File lib/logger.rb, line 606
def msg2str(msg)
  case msg
  when ::String
    msg
  when ::Exception
    "#{ msg.message } (#{ msg.class })\n" <<
      (msg.backtrace || []).join("\n")
  else
    msg.inspect
  end
end