1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
# frozen_string_literal: true
require "weakref"
module Roo
module Helpers
module WeakInstanceCache
private
def instance_cache(key)
object = nil
if instance_variable_defined?(key) && (ref = instance_variable_get(key)) && ref.weakref_alive?
begin
object = ref.__getobj__
rescue => e
unless (defined?(::WeakRef::RefError) && e.is_a?(::WeakRef::RefError)) || (defined?(RefError) && e.is_a?(RefError))
raise e
end
end
end
unless object
object = yield
ObjectSpace.define_finalizer(object, instance_cache_finalizer(key))
instance_variable_set(key, WeakRef.new(object))
end
object
end
def instance_cache_finalizer(key)
proc do |object_id|
if instance_variable_defined?(key) && (ref = instance_variable_get(key)) && (!ref.weakref_alive? || ref.__getobj__.object_id == object_id)
remove_instance_variable(key)
end
end
end
end
end
end
|
