Class: WeakRef

Inherits:
Delegator show all
Defined in:
lib/knj/rhodes/weakref.rb

Defined Under Namespace

Classes: RefError

Constant Summary collapse

@@id_map =

obj -> [ref,…]

{}
@@id_rev_map =

ref -> obj

{}
@@mutex = 
Mutex.new
@@final = 
lambda {|id|
  @@mutex.synchronize {
    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
  }
}

Instance Method Summary collapse

Methods inherited from Delegator

#!, #!=, #==, const_missing, delegating_block, #freeze, #marshal_dump, #marshal_load, #method, #method_missing, #methods, #protected_methods, public_api, #public_methods, #respond_to_missing?

Constructor Details

#initialize(orig) ⇒ WeakRef

Returns a new instance of WeakRef.



41
42
43
44
45
46
47
48
49
50
51
 
# File 'lib/knj/rhodes/weakref.rb', line 41

def initialize(orig)
  @__id = orig.object_id
  ObjectSpace.define_finalizer orig, @@final
  ObjectSpace.define_finalizer self, @@final
  @@mutex.synchronize {
    @@id_map[@__id] = [] unless @@id_map[@__id]
  }
  @@id_map[@__id].push self.object_id
  @@id_rev_map[self.object_id] = @__id
  super
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Delegator

Instance Method Details

#__getobj__ ⇒ Object 



53
54
55
56
57
58
59
60
61
62
 
# File 'lib/knj/rhodes/weakref.rb', line 53

def __getobj__
  unless @@id_rev_map[self.object_id] == @__id
    Kernel::raise RefError, "Invalid Reference - probably recycled", Kernel::caller(2)
  end
  begin
    ObjectSpace._id2ref(@__id)
  rescue RangeError
    Kernel::raise RefError, "Invalid Reference - probably recycled", Kernel::caller(2)
  end
end

#__setobj__(obj) ⇒ Object 



63
64
 
# File 'lib/knj/rhodes/weakref.rb', line 63

def __setobj__(obj)
end

#weakref_alive? ⇒ Boolean

Returns:

  • (Boolean) 


66
67
68
 
# File 'lib/knj/rhodes/weakref.rb', line 66

def weakref_alive?
  @@id_rev_map[self.object_id] == @__id
end