Gecko [ naturenectar.co.uk ]

Name	Size	Permission	Date
benchmark	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
bigdecimal	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
cgi	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
csv	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
did_you_mean	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
digest	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
drb	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
erb	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
error_highlight	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
fiddle	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
forwardable	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
io	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
json	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
logger	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
net	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
objspace	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
open3	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
openssl	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
optparse	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
psych	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
racc	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
random	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
reline	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
rinda	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
ripper	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
ruby_vm	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
set	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
syntax_suggest	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
syslog	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
unicode_normalize	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
uri	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
vendor_ruby	[ DIR ]	drwxr-xr-x	2025-04-24 08:11
yaml	[ DIR ]	drwxr-xr-x	2025-08-15 19:34
English.rb	6.11 KB	-rw-r--r--	2025-04-24 08:11
abbrev.rb	3.45 KB	-rw-r--r--	2025-04-24 08:11
base64.rb	3.35 KB	-rw-r--r--	2025-04-24 08:11
benchmark.rb	18.4 KB	-rw-r--r--	2025-04-24 08:11
bigdecimal.rb	24 B	-rw-r--r--	2025-04-24 08:11
cgi.rb	9.83 KB	-rw-r--r--	2025-04-24 08:11
coverage.rb	368 B	-rw-r--r--	2025-04-24 08:11
csv.rb	92.47 KB	-rw-r--r--	2025-04-24 08:11
date.rb	1.17 KB	-rw-r--r--	2025-04-24 08:11
delegate.rb	11.68 KB	-rw-r--r--	2025-04-24 08:11
did_you_mean.rb	5.31 KB	-rw-r--r--	2025-04-24 08:11
digest.rb	3.3 KB	-rw-r--r--	2025-04-24 08:11
drb.rb	50 B	-rw-r--r--	2025-04-24 08:11
erb.rb	14.57 KB	-rw-r--r--	2025-04-24 08:11
error_highlight.rb	84 B	-rw-r--r--	2025-04-24 08:11
expect.rb	2.19 KB	-rw-r--r--	2025-04-24 08:11
fiddle.rb	2.88 KB	-rw-r--r--	2025-04-24 08:11
fileutils.rb	79.02 KB	-rw-r--r--	2025-04-24 08:11
find.rb	2.5 KB	-rw-r--r--	2025-04-24 08:11
forwardable.rb	9.03 KB	-rw-r--r--	2025-04-24 08:11
getoptlong.rb	20.26 KB	-rw-r--r--	2025-04-24 08:11
ipaddr.rb	20.6 KB	-rw-r--r--	2025-04-24 08:11
json.rb	19.29 KB	-rw-r--r--	2025-04-24 08:11
kconv.rb	5.72 KB	-rw-r--r--	2025-04-24 08:11
logger.rb	21.95 KB	-rw-r--r--	2025-04-24 08:11
mkmf.rb	88.4 KB	-rw-r--r--	2025-04-24 08:11
monitor.rb	6.76 KB	-rw-r--r--	2025-04-24 08:11
mutex_m.rb	2.33 KB	-rw-r--r--	2025-04-24 08:11
objspace.rb	4.67 KB	-rw-r--r--	2025-04-24 08:11
observer.rb	6.38 KB	-rw-r--r--	2025-04-24 08:11
open-uri.rb	25.52 KB	-rw-r--r--	2025-04-24 08:11
open3.rb	22.11 KB	-rw-r--r--	2025-04-24 08:11
openssl.rb	1.03 KB	-rw-r--r--	2025-04-24 08:11
optionparser.rb	59 B	-rw-r--r--	2025-04-24 08:11
optparse.rb	61.06 KB	-rw-r--r--	2025-04-24 08:11
ostruct.rb	13.88 KB	-rw-r--r--	2025-04-24 08:11
pathname.rb	16.83 KB	-rw-r--r--	2025-04-24 08:11
pp.rb	17.22 KB	-rw-r--r--	2025-04-24 08:11
prettyprint.rb	15.9 KB	-rw-r--r--	2025-04-24 08:11
pstore.rb	20.52 KB	-rw-r--r--	2025-04-24 08:11
psych.rb	24.62 KB	-rw-r--r--	2025-04-24 08:11
racc.rb	137 B	-rw-r--r--	2025-04-24 08:11
readline.rb	189 B	-rw-r--r--	2025-04-24 08:11
reline.rb	17.75 KB	-rw-r--r--	2025-04-24 08:11
resolv-replace.rb	1.76 KB	-rw-r--r--	2025-04-24 08:11
resolv.rb	74.19 KB	-rw-r--r--	2025-04-24 08:11
ripper.rb	2.44 KB	-rw-r--r--	2025-04-24 08:11
securerandom.rb	2.11 KB	-rw-r--r--	2025-04-24 08:11
set.rb	25.31 KB	-rw-r--r--	2025-04-24 08:11
shellwords.rb	7.09 KB	-rw-r--r--	2025-04-24 08:11
singleton.rb	4.08 KB	-rw-r--r--	2025-04-24 08:11
socket.rb	43.72 KB	-rw-r--r--	2025-04-24 08:11
syntax_suggest.rb	74 B	-rw-r--r--	2025-04-24 08:11
tempfile.rb	13.84 KB	-rw-r--r--	2025-04-24 08:11
time.rb	23.72 KB	-rw-r--r--	2025-04-24 08:11
timeout.rb	5.83 KB	-rw-r--r--	2025-04-24 08:11
tmpdir.rb	4.7 KB	-rw-r--r--	2025-04-24 08:11
tsort.rb	14.26 KB	-rw-r--r--	2025-04-24 08:11
un.rb	11.17 KB	-rw-r--r--	2025-04-24 08:11
uri.rb	3.06 KB	-rw-r--r--	2025-04-24 08:11
weakref.rb	1.36 KB	-rw-r--r--	2025-04-24 08:11
yaml.rb	2.11 KB	-rw-r--r--	2025-04-24 08:11

Rename

# frozen_string_literal: false

# The Singleton module implements the Singleton pattern.
#
# == Usage
#
# To use Singleton, include the module in your class.
#
#    class Klass
#       include Singleton
#       # ...
#    end
#
# This ensures that only one instance of Klass can be created.
#
#      a,b = Klass.instance, Klass.instance
#
#      a == b
#      # => true
#
#      Klass.new
#      # => NoMethodError - new is private ...
#
# The instance is created at upon the first call of Klass.instance().
#
#      class OtherKlass
#        include Singleton
#        # ...
#      end
#
#      ObjectSpace.each_object(OtherKlass){}
#      # => 0
#
#      OtherKlass.instance
#      ObjectSpace.each_object(OtherKlass){}
#      # => 1
#
#
# This behavior is preserved under inheritance and cloning.
#
# == Implementation
#
# This above is achieved by:
#
# *  Making Klass.new and Klass.allocate private.
#
# *  Overriding Klass.inherited(sub_klass) and Klass.clone() to ensure that the
#    Singleton properties are kept when inherited and cloned.
#
# *  Providing the Klass.instance() method that returns the same object each
#    time it is called.
#
# *  Overriding Klass._load(str) to call Klass.instance().
#
# *  Overriding Klass#clone and Klass#dup to raise TypeErrors to prevent
#    cloning or duping.
#
# == Singleton and Marshal
#
# By default Singleton's #_dump(depth) returns the empty string. Marshalling by
# default will strip state information, e.g. instance variables from the instance.
# Classes using Singleton can provide custom _load(str) and _dump(depth) methods
# to retain some of the previous state of the instance.
#
#    require 'singleton'
#
#    class Example
#      include Singleton
#      attr_accessor :keep, :strip
#      def _dump(depth)
#        # this strips the @strip information from the instance
#        Marshal.dump(@keep, depth)
#      end
#
#      def self._load(str)
#        instance.keep = Marshal.load(str)
#        instance
#      end
#    end
#
#    a = Example.instance
#    a.keep = "keep this"
#    a.strip = "get rid of this"
#
#    stored_state = Marshal.dump(a)
#
#    a.keep = nil
#    a.strip = nil
#    b = Marshal.load(stored_state)
#    p a == b  #  => true
#    p a.keep  #  => "keep this"
#    p a.strip #  => nil
#
module Singleton
  VERSION = "0.1.1"

# Raises a TypeError to prevent cloning.
  def clone
    raise TypeError, "can't clone instance of singleton #{self.class}"
  end

# Raises a TypeError to prevent duping.
  def dup
    raise TypeError, "can't dup instance of singleton #{self.class}"
  end

# By default, do not retain any state when marshalling.
  def _dump(depth = -1)
    ''
  end

module SingletonClassMethods # :nodoc:

def clone # :nodoc:
      Singleton.__init__(super)
    end

# By default calls instance(). Override to retain singleton state.
    def _load(str)
      instance
    end

def instance # :nodoc:
      return @singleton__instance__ if @singleton__instance__
      @singleton__mutex__.synchronize {
        return @singleton__instance__ if @singleton__instance__
        @singleton__instance__ = new()
      }
      @singleton__instance__
    end

private

def inherited(sub_klass)
      super
      Singleton.__init__(sub_klass)
    end
  end

class << Singleton # :nodoc:
    def __init__(klass) # :nodoc:
      klass.instance_eval {
        @singleton__instance__ = nil
        @singleton__mutex__ = Thread::Mutex.new
      }
      klass
    end

private

# extending an object with Singleton is a bad idea
    undef_method :extend_object

def append_features(mod)
      #  help out people counting on transitive mixins
      unless mod.instance_of?(Class)
        raise TypeError, "Inclusion of the OO-Singleton module in module #{mod}"
      end
      super
    end

def included(klass)
      super
      klass.private_class_method :new, :allocate
      klass.extend SingletonClassMethods
      Singleton.__init__(klass)
    end
  end

##
  # :singleton-method: _load
  #  By default calls instance(). Override to retain singleton state.

##
  # :singleton-method: instance
  #  Returns the singleton instance.
end