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Edit File : weakref.rb \| Size : 2.68 KB
require "delegate" # WeakRef is a class to represent a reference to an object that is not seen by # the tracing phase of the garbage collector. This allows the referenced # object to be garbage collected as if nothing is referring to it. Because # WeakRef delegates method calls to the referenced object, it may be used in # place of that object, i.e. it is of the same duck type. # # Usage: # # foo = Object.new # foo = Object.new # p foo.to_s # original's class # foo = WeakRef.new(foo) # p foo.to_s # should be same class # ObjectSpace.garbage_collect # p foo.to_s # should raise exception (recycled) class WeakRef<Delegator # RefError is raised if an object cannot be referenced by a WeakRef. class RefError<StandardError end @@id_map = {} # obj -> [ref,...] @@id_rev_map = {} # ref -> obj @@final = lambda{\|id\| __old_status = Thread.critical Thread.critical = true begin rids = @@id_map[id] if rids for rid in rids @@id_rev_map.delete(rid) end @@id_map.delete(id) end rid = @@id_rev_map[id] if rid @@id_rev_map.delete(id) @@id_map[rid].delete(id) @@id_map.delete(rid) if @@id_map[rid].empty? end ensure Thread.critical = __old_status end } # Create a new WeakRef from +orig+. def initialize(orig) super __setobj__(orig) end # Return the object this WeakRef references. Raises RefError if the object # has been garbage collected. The object returned is the object to which # method calls are delegated (see Delegator). def __getobj__ unless @@id_rev_map[self.__id__] == @__id raise RefError, "Illegal Reference - probably recycled", caller(2) end begin ObjectSpace._id2ref(@__id) rescue RangeError raise RefError, "Illegal Reference - probably recycled", caller(2) end end def __setobj__(obj) @__id = obj.__id__ __old_status = Thread.critical begin Thread.critical = true unless @@id_rev_map.key?(self) ObjectSpace.define_finalizer obj, @@final ObjectSpace.define_finalizer self, @@final end @@id_map[@__id] = [] unless @@id_map[@__id] ensure Thread.critical = __old_status end @@id_map[@__id].push self.__id__ @@id_rev_map[self.__id__] = @__id end # Returns true if the referenced object still exists, and false if it has # been garbage collected. def weakref_alive? @@id_rev_map[self.__id__] == @__id end end if __FILE__ == $0 require 'thread' foo = Object.new p foo.to_s # original's class foo = WeakRef.new(foo) p foo.to_s # should be same class ObjectSpace.garbage_collect p foo.to_s # should raise exception (recycled) end Back

Edit File : weakref.rb | Size : 2.68 KB

require "delegate"

# WeakRef is a class to represent a reference to an object that is not seen by
# the tracing phase of the garbage collector.  This allows the referenced
# object to be garbage collected as if nothing is referring to it. Because
# WeakRef delegates method calls to the referenced object, it may be used in
# place of that object, i.e. it is of the same duck type.
#
# Usage:
#
#   foo = Object.new
#   foo = Object.new
#   p foo.to_s			# original's class
#   foo = WeakRef.new(foo)
#   p foo.to_s			# should be same class
#   ObjectSpace.garbage_collect
#   p foo.to_s			# should raise exception (recycled)
class WeakRef<Delegator

# RefError is raised if an object cannot be referenced by a WeakRef.
  class RefError<StandardError
  end

@@id_map =  {}                # obj -> [ref,...]
  @@id_rev_map =  {}            # ref -> obj
  @@final = lambda{|id|
    __old_status = Thread.critical
    Thread.critical = true
    begin
      rids = @@id_map[id]
      if rids
	for rid in rids
	  @@id_rev_map.delete(rid)
	end
	@@id_map.delete(id)
      end
      rid = @@id_rev_map[id]
      if rid
	@@id_rev_map.delete(id)
	@@id_map[rid].delete(id)
	@@id_map.delete(rid) if @@id_map[rid].empty?
      end
    ensure
      Thread.critical = __old_status
    end
  }

# Create a new WeakRef from +orig+.
  def initialize(orig)
    super
    __setobj__(orig)
  end

# Return the object this WeakRef references. Raises RefError if the object
  # has been garbage collected.  The object returned is the object to which
  # method calls are delegated (see Delegator).
  def __getobj__
    unless @@id_rev_map[self.__id__] == @__id
      raise RefError, "Illegal Reference - probably recycled", caller(2)
    end
    begin
      ObjectSpace._id2ref(@__id)
    rescue RangeError
      raise RefError, "Illegal Reference - probably recycled", caller(2)
    end
  end

def __setobj__(obj)
    @__id = obj.__id__
    __old_status = Thread.critical
    begin
      Thread.critical = true
      unless @@id_rev_map.key?(self)
        ObjectSpace.define_finalizer obj, @@final
        ObjectSpace.define_finalizer self, @@final
      end
      @@id_map[@__id] = [] unless @@id_map[@__id]
    ensure
      Thread.critical = __old_status
    end
    @@id_map[@__id].push self.__id__
    @@id_rev_map[self.__id__] = @__id
  end

# Returns true if the referenced object still exists, and false if it has
  # been garbage collected.
  def weakref_alive?
    @@id_rev_map[self.__id__] == @__id
  end
end

if __FILE__ == $0
  require 'thread'
  foo = Object.new
  p foo.to_s			# original's class
  foo = WeakRef.new(foo)
  p foo.to_s			# should be same class
  ObjectSpace.garbage_collect
  p foo.to_s			# should raise exception (recycled)
end

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