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Edit File : weakref.rb \| Size : 2.95 KB
# frozen_string_literal: false require "delegate" # Weak Reference class that allows a referenced object to be # garbage-collected. # # A WeakRef may be used exactly like the object it references. # # Usage: # # foo = Object.new # create a new object instance # p foo.to_s # original's class # foo = WeakRef.new(foo) # reassign foo with WeakRef instance # p foo.to_s # should be same class # GC.start # start the garbage collector # p foo.to_s # should raise exception (recycled) # # == Example # # With help from WeakRef, we can implement our own rudimentary WeakHash class. # # We will call it WeakHash, since it's really just a Hash except all of it's # keys and values can be garbage collected. # # require 'weakref' # # class WeakHash < Hash # def []= key, obj # super WeakRef.new(key), WeakRef.new(obj) # end # end # # This is just a simple implementation, we've opened the Hash class and changed # Hash#store to create a new WeakRef object with +key+ and +obj+ parameters # before passing them as our key-value pair to the hash. # # With this you will have to limit your self to String keys, otherwise you # will get an ArgumentError because WeakRef cannot create a finalizer for a # Symbol. Symbols are immutable and cannot be garbage collected. # # Let's see it in action: # # omg = "lol" # c = WeakHash.new # c['foo'] = "bar" # c['baz'] = Object.new # c['qux'] = omg # puts c.inspect # #=> {"foo"=>"bar", "baz"=>#<Object:0x007f4ddfc6cb48>, "qux"=>"lol"} # # # Now run the garbage collector # GC.start # c['foo'] #=> nil # c['baz'] #=> nil # c['qux'] #=> nil # omg #=> "lol" # # puts c.inspect # #=> WeakRef::RefError: Invalid Reference - probably recycled # # You can see the local variable +omg+ stayed, although its reference in our # hash object was garbage collected, along with the rest of the keys and # values. Also, when we tried to inspect our hash, we got a WeakRef::RefError. # This is because these objects were also garbage collected. class WeakRef < Delegator ## # RefError is raised when a referenced object has been recycled by the # garbage collector class RefError < StandardError end @@__map = ::ObjectSpace::WeakMap.new ## # Creates a weak reference to +orig+ # # Raises an ArgumentError if the given +orig+ is immutable, such as Symbol, # Fixnum, or Float. def initialize(orig) case orig when true, false, nil @delegate_sd_obj = orig else @@__map[self] = orig end super end def __getobj__ # :nodoc: @@__map[self] or defined?(@delegate_sd_obj) ? @delegate_sd_obj : Kernel::raise(RefError, "Invalid Reference - probably recycled", Kernel::caller(2)) end def __setobj__(obj) # :nodoc: end ## # Returns true if the referenced object is still alive. def weakref_alive? @@__map.key?(self) or defined?(@delegate_sd_obj) end end Back

Edit File : weakref.rb | Size : 2.95 KB

# frozen_string_literal: false
require "delegate"

# Weak Reference class that allows a referenced object to be
# garbage-collected.
#
# A WeakRef may be used exactly like the object it references.
#
# Usage:
#
#   foo = Object.new            # create a new object instance
#   p foo.to_s                  # original's class
#   foo = WeakRef.new(foo)      # reassign foo with WeakRef instance
#   p foo.to_s                  # should be same class
#   GC.start                    # start the garbage collector
#   p foo.to_s                  # should raise exception (recycled)
#
# == Example
#
# With help from WeakRef, we can implement our own rudimentary WeakHash class.
#
# We will call it WeakHash, since it's really just a Hash except all of it's
# keys and values can be garbage collected.
#
#     require 'weakref'
#
#     class WeakHash < Hash
#       def []= key, obj
#         super WeakRef.new(key), WeakRef.new(obj)
#       end
#     end
#
# This is just a simple implementation, we've opened the Hash class and changed
# Hash#store to create a new WeakRef object with +key+ and +obj+ parameters
# before passing them as our key-value pair to the hash.
#
# With this you will have to limit your self to String keys, otherwise you
# will get an ArgumentError because WeakRef cannot create a finalizer for a
# Symbol. Symbols are immutable and cannot be garbage collected.
#
# Let's see it in action:
#
#   omg = "lol"
#   c = WeakHash.new
#   c['foo'] = "bar"
#   c['baz'] = Object.new
#   c['qux'] = omg
#   puts c.inspect
#   #=> {"foo"=>"bar", "baz"=>#<Object:0x007f4ddfc6cb48>, "qux"=>"lol"}
#
#   # Now run the garbage collector
#   GC.start
#   c['foo'] #=> nil
#   c['baz'] #=> nil
#   c['qux'] #=> nil
#   omg      #=> "lol"
#
#   puts c.inspect
#   #=> WeakRef::RefError: Invalid Reference - probably recycled
#
# You can see the local variable +omg+ stayed, although its reference in our
# hash object was garbage collected, along with the rest of the keys and
# values. Also, when we tried to inspect our hash, we got a WeakRef::RefError.
# This is because these objects were also garbage collected.

class WeakRef < Delegator

##
  # RefError is raised when a referenced object has been recycled by the
  # garbage collector

class RefError < StandardError
  end

@@__map = ::ObjectSpace::WeakMap.new

##
  # Creates a weak reference to +orig+
  #
  # Raises an ArgumentError if the given +orig+ is immutable, such as Symbol,
  # Fixnum, or Float.

def initialize(orig)
    case orig
    when true, false, nil
      @delegate_sd_obj = orig
    else
      @@__map[self] = orig
    end
    super
  end

def __getobj__ # :nodoc:
    @@__map[self] or defined?(@delegate_sd_obj) ? @delegate_sd_obj :
      Kernel::raise(RefError, "Invalid Reference - probably recycled", Kernel::caller(2))
  end

def __setobj__(obj) # :nodoc:
  end

##
  # Returns true if the referenced object is still alive.

def weakref_alive?
    @@__map.key?(self) or defined?(@delegate_sd_obj)
  end
end

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