Module: Logging

Defined in:
lib/dldinternet/mixlib/logging.rb

Defined Under Namespace

Classes: ColorScheme, LogEvent, Logger

Class Method Summary collapse

Class Method Details

.logger(*args) ⇒ Object

call-seq:

Logging.logger( device, age = 7, size = 1048576 )
Logging.logger( device, age = 'weekly' )

This convenience method returns a Logger instance configured to behave similarly to a core Ruby Logger instance.

The device is the logging destination. This can be a filename (String) or an IO object (STDERR, STDOUT, an open File, etc.). The age is the number of old log files to keep or the frequency of rotation (daily, weekly, or monthly). The size is the maximum logfile size and is only used when age is a number.

Using the same device twice will result in the same Logger instance being returned. For example, if a Logger is created using STDOUT then the same Logger instance will be returned the next time STDOUT is used. A new Logger instance can be obtained by closing the previous logger instance.

log1 = Logging.logger(STDOUT)
log2 = Logging.logger(STDOUT)
log1.object_id == log2.object_id  #=> true

log1.close
log2 = Logging.logger(STDOUT)
log1.object_id == log2.object_id  #=> false

The format of the log messages can be changed using a few optional parameters. The :pattern can be used to change the log message format. The :date_pattern can be used to change how timestamps are formatted.

log = Logging.logger(STDOUT,
          :pattern => "[%d] %-5l : %m\n",
          :date_pattern => "%Y-%m-%d %H:%M:%S.%s")

See the documentation for the Logging::Layouts::Pattern class for a full description of the :pattern and :date_pattern formatting strings.



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# File 'lib/dldinternet/mixlib/logging.rb', line 57

def logger( *args )
  return ::Logging::Logger if args.empty?

  opts = args.pop if args.last.instance_of?(Hash)
  opts ||= Hash.new

  dev = args.shift
  keep = age = args.shift
  size = args.shift

  name = case dev
           when String; dev
           when File; dev.path
           else dev.object_id.to_s end

  repo = ::Logging::Repository.instance
  return repo[name] if repo.has_logger? name

  l_opts = {
      :pattern => "%.1l, [%d #%p] %#{::Logging::MAX_LEVEL_LENGTH}l : %m\n",
      :date_pattern => '%Y-%m-%dT%H:%M:%S.%s'
  }
  [:pattern, :date_pattern, :date_method].each do |o|
    l_opts[o] = opts.delete(o) if opts.has_key? o
  end
  layout = ::Logging::Layouts::Pattern.new(l_opts)

  a_opts = Hash.new
  a_opts[:size] = size if size.instance_of?(Integer)
  a_opts[:age]  = age  if age.instance_of?(String)
  a_opts[:keep] = keep if keep.instance_of?(Integer)
  a_opts[:filename] = dev if dev.instance_of?(String)
  a_opts[:layout] = layout
  a_opts.merge! opts

  appender =
      case dev
        when String
          ::Logging::Appenders::RollingFile.new(name, a_opts)
        else
          ::Logging::Appenders::IO.new(name, dev, a_opts)
      end

  logger = ::Logging::Logger.new(name, opts)
  logger.add_appenders appender
  logger.additive = false

  class << logger
    def close
      @appenders.each {|a| a.close}
      h = ::Logging::Repository.instance.instance_variable_get :@h
      h.delete(@name)
      class << self; undef :close; end
    end
  end

  logger
end