Method: ETL.logger

Defined in:
lib/etl/etl.rb

.logger ⇒ Object

Sets up a logger for the class. Respects inheritance, so a different logger will be created for each ETL subclass. Using the standard log levels here: DEBUG < INFO < WARN < ERROR < FATAL



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# File 'lib/etl/etl.rb', line 32

def logger
  
  logger_name = (self.to_s + "_logger").to_sym
  
  # Find and return the cached logger, if it's setup
  logger = read_inheritable_attribute(logger_name)
  return logger if logger
  
  # Create a logger.  Will configure it here and save it in a moment.
  logger = Log4r::Logger.new(self.to_s)
  
  # Set my default output format
  format = Log4r::PatternFormatter.new(:pattern => "[%l] %d :: %m")
  
  # Setup a console logger with our formatting
  console = Log4r::StderrOutputter.new 'console'
  console.level = Log4r::WARN
  console.formatter = format
  
  # Setup a logger to a file with our formatting
  logfile = Log4r::FileOutputter.new('logfile', 
                           :filename => self.logger_filename, 
                           :trunc => false,
                           :level => Log4r::DEBUG)
  logfile.formatter = format
  
  # Tell the logger about both outputs.
  logger.add('console','logfile')
  
  # Store the logger as an inheritable class attribute
  write_inheritable_attribute(logger_name, logger)
  
  # Return the logger
  logger
end