Modules as Singletons : Singletons « Design Patterns « Ruby






  1. Ruby
  2. Design Patterns
  3. Singletons

Modules as Singletons


module ModuleBasedLogger
  ERROR = 1
  WARNING = 2
  INFO = 3

  @@log = File.open("log.txt", "w")
  @@level = WARNING

  def self.error(msg)
    @@log.puts(msg)
    @@log.flush
  end
end

ModuleBasedLogger.error('Computer wins chess game.')








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3.Singleton a class
4.Classes as Singletons
5.include Singleton