GIF89a=( �' 7IAXKgNgYvYx\%wh&h}t�h%�s%x�}9�R��&�0%� (�.��5�SD��&�a)�x5��;ͣ*ȡ&ղ)ׯ7׵<ѻ4�3�H֧KͯT��Y�aq��q��F� !� ' !� NETSCAPE2.0 , =( ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g���E�������R���E����B�� ��ȸ��D���"�Ů� �H��L��D٫D�B�����D���T���H �G��A R�ڐ |�� ٭&��E8�S�kG�A�px�a��� R2XB��E8I���6X�:vT)�~��q�賥��"F~%x� � 4#Z�0O|-4Bs�X:= Q� Sal��yXJ`GȦ|s h��K3l7�B|�$'7Jީܪ0!��D�n=�P� ����0`�R�lj����v>���5 �.69�ϸd�����nlv�9��f{���Pbx �l5}�p� ��� �3a���I�O����!ܾ���i��9��#��)p�a ޽ �{�)vm��%D~ 6f��s}Œ�D�W E�`!� �&L8x� �ܝ{)x`X/>�}m��R�*|`D�=�_ ^�5 !_&'a�O�7�c��`DCx`�¥�9�Y�F���`?��"� �n@`�} lď��@4>�d S �v�xN��"@~d��=�g�s~G��� ���ud &p8Q�)ƫlXD����A~H�ySun�j���k*D�LH�] ��C"J��Xb~ʪwSt}6K,��q�S:9ت:���l�@�`�� �.۬�t9�S�[:��=`9N����{¿�A !R�:���6��x�0�_ �;������^���#����!����U���;0L1�����p% A��U̬ݵ��%�S��!���~`�G���� ���=4�np�3���������u�u�ٮ|%2�I��r�#0��J``8�@S@5� ���^`8E�]�.�S���7 � �0�j S�D� z���i�S�����!���l��w9*�D�I�nEX��� &A�Go�Qf��F��;���}�J����F5��Q|���X��T��y���]� o ��C=��:���PB@ D׽S�(>�C�x}`��xJЬ�۠��p+eE0`�}`A �/NE�� �9@��� H�7�!%B0`�l*��!8 2�%� �:�1�0E��ux%nP1�!�C)�P81l�ɸF#Ƭ{����B0>�� �b�`��O3��()yRpb��E.ZD8�H@% �Rx+%���c� ���f��b�d�`F�"8�XH"��-�|1�6iI, 2�$+](A*j� QT�o0.�U�`�R�}`�SN����yae�����b��o~ S)�y�@��3 �tT�0�&�+~L�f"�-|�~��>!�v��~�\Q1)}@�}h#aP72�"�$ !� " , =( &7IAXG]KgNgYvYxR"k\%w]'}h}t�h%�g+�s%r.m3ax3�x�}9��&��+�!7�0%� (�.�SD��&��;�"&ײ)׻4��6�K� �@pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E �� �������E �´��C���ǶR��D��"Ʒ�ʱH��M��GڬD�B����D��T����G���C�C� l&�~:'�tU�6ɹ#��)�'�.6�&��Ȼ K(8p0N�?!�2"��NIJX>R��OM '��2�*x�>#n� �@<[:�I�f ��T���Cdb��[�}E�5MBo��@�`@��tW-3 �x�B���jI�&E�9[T&$��ﯧ&"s��ȳ����dc�UUρ#���ldj?����`\}���u|3'�R]�6 �S#�!�FKL�*N E���`$�:e�YD�q�.�촁�s \-�jA 9�����-��M[�x(�s��x�|���p��}k�T�DpE@W� ��]k`1� ���Yb ��0l��*n0��"~zBd�~u�7�0Bl��0-�x~|U�U0 �h�*HS�|��e"#"?vp�i`e6^�+q��`m8 #V�� ��VS|`��"m"сSn|@:U���~`pb�G�ED����2F�I�? >�x� R� ��%~jx��<�a�9ij�2�D��&: Z`�]w���:�6��B�7eFJ|�ҧ�,���FǮcS�ʶ+B�,�ܺN���>PAD�HD��~���n��}�#�� Q��S���2�X�{�k�lQ�2�����w�|2� h9��G�,m���3��6-��E�L��I�³*K���q�`DwV�QXS��peS��� qܧTS����R�u �<�a�*At�lmE� � ��N[P1�ۦ��$��@`��Dpy�yXvCAy�B`}D� 0QwG#� �a[^�� $���Ǧ{L�"[��K�g�;�S~��GX.�goT.��ư��x���?1z��x~:�g�|�L� ��S`��0S]P�^p F<""�?!,�!N4&P� ����:T�@h�9%t��:�-~�I<`�9p I&.)^ 40D#p@�j4�ج:�01��rܼF2oW�#Z ;$Q q  �K��Nl#29 !F@�Bh�ᏬL!XF�LHKh�.�hE&J�G��<"WN!�����Y@� >R~19J"�2,/ &.GXB%�R�9B6�W]���W�I�$��9�RE8Y� ��"�A5�Q.axB�&ة�J�! �t)K%tS-�JF b�NMxL��)�R��"���6O!TH�H� 0 !� ) , =( &AXKgNgYvYxR"k\%wh&h}h%�g+�s%r.x3�x�}9��&��+�R,�!7�0%� (�.��5��&�a)��;�"&ף*Ȳ)ׯ7׻4�3��6�H֧KͻH�T��Y��q��h� ��pH,�Ȥr�l:xШtJ�Z�جv��z��xL.:��z�n���|N�����~�������& !�0`9R�}��"�"a:S�~x��������g �� E$����� � ����$E$��"��D� � ������R��C��� E ��H�M��G�D� �B��ϾD��a��`1r��Ӑ�� �o~�zU!L�C'�yW�UGt����ll�0���uG�)A�s[��x� �xO%��X2�  P�n:R/��aHae+�Dm?# ǣ6�8�J�x�Di�M���j���5oQ7�- <! *�l��R2r/a!l)d� A"�E���� &� ;��c �%����b��pe~C"B���H�eF2��`8qb�t_`ur`e� w�u3��Pv�h""�`�Íx�LĹ��3� �~ֺ�:���MDfJ� �۵�W�%�S�X �؁)�@��:E��w�u�Sxb8y\m�zS��Zb�E�L��w!y(>�"w�=�|��s�d �C�W)H�cC$�L �7r.�\{)@�`@ �X�$PD `aaG:���O�72E�amn]�"Rc�x�R� &dR8`g��i�xLR!�P &d����T���i�|�_ � Qi�#�`g:��:noM� :V �)p����W&a=�e�k� j���1߲s�x�W�jal|0��B0�, \j۴:6���C ��W��|��9���zĸV {�;��n��V�m�I��.��PN� ����C��+��By�ѾHŸ:��� 7�Y�FTk�SaoaY$D�S���29R�kt� ��f� ��:��Sp�3�I��DZ� �9���g��u�*3)O��[_hv ,���Et x�BH� �[��64M@�S�M7d�l�ܶ5-��U܍��z�R3Ԭ3~ ��P��5�g: ���kN�&0�j4���#{��3S�2�K�'ợl���2K{� {۶?~m𸧠�I�nE�='����^���_�=��~�#O���'���o..�Y�n��CSO��a��K��o,���b�����{�C�� "�{�K ��w��Ozdը�:$ ���v�] A#� ���a�z)Rx׿ƥ�d``�w-�y�f�K!����|��P��=�`�(f��'Pa ��BJa%��f�%`�}F����6>��`G"�}�=�!o`�^FP�ةQ�C���`(�}\�ݮ ��$<��n@dĠE#��U�I�!� #l��9`k���'Rr��Z�NB�MF �[�+9���-�wj���8�r� ,V�h"�|�S=�G_��"E� 0i*%̲��da0mVk�):;&6p>�jK ��# �D�:�c?:R Ӭf��I-�"�<�="��7�3S��c2RW ,�8(T"P0F¡Jh�" ; 403WebShell
403Webshell
Server IP : 81.88.48.95  /  Your IP : 10.2.217.94, 216.73.216.227
Web Server : Apache
System : Linux opus08 3.2.0-4-amd64 #1 SMP Debian 3.2.68-1+deb7u3 x86_64
User : nobody ( 99)
PHP Version : 5.3.3-7+squeeze3
Disable Function : NONE
MySQL : ON  |  cURL : ON  |  WGET : ON  |  Perl : ON  |  Python : OFF  |  Sudo : OFF  |  Pkexec : OFF
Directory :  /usr/lib/ruby/1.8/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :


[ Back ]     

Current File : /usr/lib/ruby/1.8//singleton.rb
# The Singleton module implements the Singleton pattern.
#
# Usage:
#    class Klass
#       include Singleton
#       # ...
#    end
#
# *  this ensures that only one instance of Klass lets call it
#    ``the instance'' can be created.
#
#    a,b  = Klass.instance, Klass.instance
#    a == b   # => true
#    a.new    #  NoMethodError - new is private ...
#
# *  ``The instance'' is created at instantiation time, in other
#    words the first call of Klass.instance(), thus
#
#      class OtherKlass
#        include Singleton
#        # ...
#      end
#      ObjectSpace.each_object(OtherKlass){} # => 0.
#
# *  This behavior is preserved under inheritance and cloning.
#
#
#
# This is achieved by marking
# *  Klass.new and Klass.allocate - as private
#
# Providing (or modifying) the class methods
# *  Klass.inherited(sub_klass) and Klass.clone()  -
#    to ensure that the Singleton pattern is properly
#    inherited and cloned.
#
# *  Klass.instance()  -  returning ``the instance''. After a
#    successful self modifying (normally the first) call the
#    method body is a simple:
#
#       def Klass.instance()
#         return @__instance__
#       end
#
# *  Klass._load(str)  -  calling Klass.instance()
#
# *  Klass._instantiate?()  -  returning ``the instance'' or
#    nil. This hook method puts a second (or nth) thread calling
#    Klass.instance() on a waiting loop. The return value
#    signifies the successful completion or premature termination
#    of the first, or more generally, current "instantiation thread".
#
#
# The instance method of Singleton are
# * clone and dup - raising TypeErrors to prevent cloning or duping
#
# *  _dump(depth) - returning the empty string.  Marshalling strips
#    by default all state information, e.g. instance variables and
#    taint state, from ``the instance''.  Providing custom _load(str)
#    and _dump(depth) hooks allows the (partially) resurrections of
#    a previous state of ``the instance''.



module Singleton
  #  disable build-in copying methods
  def clone
    raise TypeError, "can't clone instance of singleton #{self.class}"
  end
  def dup
    raise TypeError, "can't dup instance of singleton #{self.class}"
  end

  #  default marshalling strategy
  def _dump(depth=-1)
    ''
  end
end


class << Singleton
  #  Method body of first instance call.
  FirstInstanceCall = proc do
    #  @__instance__ takes on one of the following values
    #  * nil     -  before and after a failed creation
    #  * false  -  during creation
    #  * sub_class instance  -  after a successful creation
    #  the form makes up for the lack of returns in progs
    Thread.critical = true
    if  @__instance__.nil?
      @__instance__  = false
      Thread.critical = false
      begin
        @__instance__ = new
      ensure
        if @__instance__
          class <<self
            remove_method :instance
            def instance; @__instance__ end
          end
        else
          @__instance__ = nil #  failed instance creation
        end
      end
    elsif  _instantiate?()
      Thread.critical = false
    else
      @__instance__  = false
      Thread.critical = false
      begin
        @__instance__ = new
      ensure
        if @__instance__
          class <<self
            remove_method :instance
            def instance; @__instance__ end
          end
        else
          @__instance__ = nil
        end
      end
    end
    @__instance__
  end

  module SingletonClassMethods
    # properly clone the Singleton pattern - did you know
    # that duping doesn't copy class methods?
    def clone
      Singleton.__init__(super)
    end

    def _load(str)
      instance
    end

    private

    #  ensure that the Singleton pattern is properly inherited
    def inherited(sub_klass)
      super
      Singleton.__init__(sub_klass)
    end

    # waiting-loop hook
    def _instantiate?()
      while false.equal?(@__instance__)
        Thread.critical = false
        sleep(0.08)   # timeout
        Thread.critical = true
      end
      @__instance__
    end
  end

  def __init__(klass)
    klass.instance_eval { @__instance__ = nil }
    class << klass
      define_method(:instance,FirstInstanceCall)
    end
    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



if __FILE__ == $0

def num_of_instances(klass)
    "#{ObjectSpace.each_object(klass){}} #{klass} instance(s)"
end

# The basic and most important example.

class SomeSingletonClass
  include Singleton
end
puts "There are #{num_of_instances(SomeSingletonClass)}"

a = SomeSingletonClass.instance
b = SomeSingletonClass.instance # a and b are same object
puts "basic test is #{a == b}"

begin
  SomeSingletonClass.new
rescue  NoMethodError => mes
  puts mes
end



puts "\nThreaded example with exception and customized #_instantiate?() hook"; p
Thread.abort_on_exception = false

class Ups < SomeSingletonClass
  def initialize
    self.class.__sleep
    puts "initialize called by thread ##{Thread.current[:i]}"
  end
end

class << Ups
  def _instantiate?
    @enter.push Thread.current[:i]
    while false.equal?(@__instance__)
      Thread.critical = false
      sleep 0.08
      Thread.critical = true
    end
    @leave.push Thread.current[:i]
    @__instance__
  end

  def __sleep
    sleep(rand(0.08))
  end

  def new
    begin
      __sleep
      raise  "boom - thread ##{Thread.current[:i]} failed to create instance"
    ensure
      # simple flip-flop
      class << self
        remove_method :new
      end
    end
  end

  def instantiate_all
    @enter = []
    @leave = []
    1.upto(9) {|i|
      Thread.new {
        begin
          Thread.current[:i] = i
          __sleep
          instance
        rescue RuntimeError => mes
          puts mes
        end
      }
    }
    puts "Before there were #{num_of_instances(self)}"
    sleep 3
    puts "Now there is #{num_of_instances(self)}"
    puts "#{@enter.join '; '} was the order of threads entering the waiting loop"
    puts "#{@leave.join '; '} was the order of threads leaving the waiting loop"
  end
end


Ups.instantiate_all
# results in message like
# Before there were 0 Ups instance(s)
# boom - thread #6 failed to create instance
# initialize called by thread #3
# Now there is 1 Ups instance(s)
# 3; 2; 1; 8; 4; 7; 5 was the order of threads entering the waiting loop
# 3; 2; 1; 7; 4; 8; 5 was the order of threads leaving the waiting loop


puts "\nLets see if class level cloning really works"
Yup = Ups.clone
def Yup.new
  begin
    __sleep
    raise  "boom - thread ##{Thread.current[:i]} failed to create instance"
  ensure
    # simple flip-flop
    class << self
      remove_method :new
    end
  end
end
Yup.instantiate_all


puts "\n\n","Customized marshalling"
class A
  include Singleton
  attr_accessor :persist, :die
  def _dump(depth)
    # this strips the @die information from the instance
    Marshal.dump(@persist,depth)
  end
end

def A._load(str)
  instance.persist = Marshal.load(str)
  instance
end

a = A.instance
a.persist = ["persist"]
a.die = "die"
a.taint

stored_state = Marshal.dump(a)
# change state
a.persist = nil
a.die = nil
b = Marshal.load(stored_state)
p a == b  #  => true
p a.persist  #  => ["persist"]
p a.die      #  => nil


puts "\n\nSingleton with overridden default #inherited() hook"
class Up
end
def Up.inherited(sub_klass)
  puts "#{sub_klass} subclasses #{self}"
end


class Middle < Up
  include Singleton
end

class Down < Middle; end

puts  "and basic \"Down test\" is #{Down.instance == Down.instance}\n
Various exceptions"

begin
  module AModule
    include Singleton
  end
rescue TypeError => mes
  puts mes  #=> Inclusion of the OO-Singleton module in module AModule
end

begin
  'aString'.extend Singleton
rescue NoMethodError => mes
  puts mes  #=> undefined method `extend_object' for Singleton:Module
end

end

Youez - 2016 - github.com/yon3zu
LinuXploit