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# frozen_string_literal: false
require_relative 'drb'
require 'monitor'
module DRb
# To use WeakIdConv:
#
# DRb.start_service(nil, nil, {:idconv => DRb::WeakIdConv.new})
class WeakIdConv < DRbIdConv
class WeakSet
include MonitorMixin
def initialize
super()
@immutable = {}
@map = ObjectSpace::WeakMap.new
end
def add(obj)
synchronize do
begin
@map[obj] = self
rescue ArgumentError
@immutable[obj.__id__] = obj
end
return obj.__id__
end
end
def fetch(ref)
synchronize do
@immutable.fetch(ref) {
@map.each { |key, _|
return key if key.__id__ == ref
}
raise RangeError.new("invalid reference")
}
end
end
end
def initialize()
super()
@weak_set = WeakSet.new
end
def to_obj(ref) # :nodoc:
return super if ref.nil?
@weak_set.fetch(ref)
end
def to_id(obj) # :nodoc:
return @weak_set.add(obj)
end
end
end
# DRb.install_id_conv(WeakIdConv.new)
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