Module: Singleton

Defined in:

lib/singleton.rb

Defined Under Namespace

Modules: SingletonClassMethods

Class Method Summary (collapse)

• + (Object) __init__(klass)

Instance Method Summary (collapse)

• - (Object) _dump(depth = 1)

  default marshalling strategy.

• - (Object) clone

  disable build-in copying methods.

• - (Object) dup

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# File 'lib/singleton.rb', line 100

def __init__(klass)
  klass.instance_eval {
    @singleton__instance__ = nil
    @singleton__mutex__ = Mutex.new
  }
  def klass.instance
    return @singleton__instance__ if @singleton__instance__
    @singleton__mutex__.synchronize {
      return @singleton__instance__ if @singleton__instance__
      @singleton__instance__ = new()
    }
    @singleton__instance__
  end
  klass
end

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# File 'lib/singleton.rb', line 75

def _dump(depth = -1)
  ''
end

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# File 'lib/singleton.rb', line 67

def clone
  raise TypeError, "can't clone instance of singleton #{self.class}"
end

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# File 'lib/singleton.rb', line 70

def dup
  raise TypeError, "can't dup instance of singleton #{self.class}"
end