#$@%#$%!

Ngiler SH3LL 360
: / opt / alt / ruby34 / share / ruby /

Information Server
MySQL : OFF Perl : OFF CURL : ON WGET : OFF PKEXEC : OFF

Directive	Local Value
IP Address	162.0.209.101
System	Linux premium169.web-hosting.com 4.18.0-553.50.1.lve.el8.x86_64 #1 SMP Thu Apr 17 19:10:24 UTC 2025 x86_64
User	luxeelil
PHP Version	8.0.30
Software	LiteSpeed
Doc root	Writable

Edit File : singleton.rb \| Size : 5.52 KB
# frozen_string_literal: true # 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 = "0.3.0" module SingletonInstanceMethods # 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 end include SingletonInstanceMethods 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: @singleton__instance__ \|\| @singleton__mutex__.synchronize { @singleton__instance__ \|\|= new } end private def inherited(sub_klass) super Singleton.__init__(sub_klass) end def set_instance(val) @singleton__instance__ = val end def set_mutex(val) @singleton__mutex__ = val end end def self.module_with_class_methods SingletonClassMethods end module SingletonClassProperties def self.included(c) # extending an object with Singleton is a bad idea c.undef_method :extend_object end def self.extended(c) # extending an object with Singleton is a bad idea c.singleton_class.send(:undef_method, :extend_object) end def __init__(klass) # :nodoc: klass.instance_eval { set_instance(nil) set_mutex(Thread::Mutex.new) } klass end private 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 module_with_class_methods Singleton.__init__(klass) end end extend SingletonClassProperties ## # :singleton-method: _load # By default calls instance(). Override to retain singleton state. ## # :singleton-method: instance # Returns the singleton instance. end if defined?(Ractor) module RactorLocalSingleton include Singleton::SingletonInstanceMethods module RactorLocalSingletonClassMethods include Singleton::SingletonClassMethods def instance set_mutex(Thread::Mutex.new) if Ractor.current[mutex_key].nil? return Ractor.current[instance_key] if Ractor.current[instance_key] Ractor.current[mutex_key].synchronize { return Ractor.current[instance_key] if Ractor.current[instance_key] set_instance(new()) } Ractor.current[instance_key] end private def instance_key :"__RactorLocalSingleton_instance_with_class_id_#{object_id}__" end def mutex_key :"__RactorLocalSingleton_mutex_with_class_id_#{object_id}__" end def set_instance(val) Ractor.current[instance_key] = val end def set_mutex(val) Ractor.current[mutex_key] = val end end def self.module_with_class_methods RactorLocalSingletonClassMethods end extend Singleton::SingletonClassProperties end end Back

Edit File : singleton.rb | Size : 5.52 KB

# frozen_string_literal: true

# 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 = "0.3.0"

module SingletonInstanceMethods
    # 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
  end
  include SingletonInstanceMethods

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:
      @singleton__instance__ || @singleton__mutex__.synchronize { @singleton__instance__ ||= new }
    end

private

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

def set_instance(val)
      @singleton__instance__ = val
    end

def set_mutex(val)
      @singleton__mutex__ = val
    end
  end

def self.module_with_class_methods
    SingletonClassMethods
  end

module SingletonClassProperties

def self.included(c)
      # extending an object with Singleton is a bad idea
      c.undef_method :extend_object
    end

def self.extended(c)
      # extending an object with Singleton is a bad idea
      c.singleton_class.send(:undef_method, :extend_object)
    end

def __init__(klass) # :nodoc:
      klass.instance_eval {
        set_instance(nil)
        set_mutex(Thread::Mutex.new)
      }
      klass
    end

private

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 module_with_class_methods
      Singleton.__init__(klass)
    end
  end
  extend SingletonClassProperties

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

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

if defined?(Ractor)
  module RactorLocalSingleton
    include Singleton::SingletonInstanceMethods

module RactorLocalSingletonClassMethods
      include Singleton::SingletonClassMethods
      def instance
        set_mutex(Thread::Mutex.new) if Ractor.current[mutex_key].nil?
        return Ractor.current[instance_key] if Ractor.current[instance_key]
        Ractor.current[mutex_key].synchronize {
          return Ractor.current[instance_key] if Ractor.current[instance_key]
          set_instance(new())
        }
        Ractor.current[instance_key]
      end

private

def instance_key
        :"__RactorLocalSingleton_instance_with_class_id_#{object_id}__"
      end

def mutex_key
        :"__RactorLocalSingleton_mutex_with_class_id_#{object_id}__"
      end

def set_instance(val)
        Ractor.current[instance_key] = val
      end

def set_mutex(val)
        Ractor.current[mutex_key] = val
      end
    end

def self.module_with_class_methods
      RactorLocalSingletonClassMethods
    end

extend Singleton::SingletonClassProperties
  end
end

Back