Module: FTW::Singleton

Included in:
DNS, WebSocket::Writer
Defined in:
lib/ftw/singleton.rb

Overview

A mixin that provides singleton-ness

Usage:

class Foo
  extend FTW::Singleton

  ...
end

foo = Foo.singleton

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(klass) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/ftw/singleton.rb', line 15

def self.included(klass)
  raise ArgumentError.new("In #{klass.name}, you want to use 'extend #{self.name}', not 'include ...'")
end

Instance Method Details

#singleton ⇒ Object

Create a singleton instance of this class.



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# File 'lib/ftw/singleton.rb', line 20

def singleton
  @instance ||= self.new
  return @instance
end