Module: Celluloid::Internals::UUID

Defined in:
lib/celluloid/internals/uuid.rb

Overview

Clearly Ruby doesn’t have enough UUID libraries This one aims to be fast and simple with good support for multiple threads If there’s a better UUID library I can use with similar multithreaded performance, I certainly wouldn’t mind using a gem for this!

Constant Summary collapse

PREFIX = 
"#{values[1]}-#{values[2]}-4#{values[3]}-8#{values[4]}".freeze
BLOCK_SIZE = 
0x10000

Class Method Summary collapse

Class Method Details

.generate ⇒ Object 



17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
# File 'lib/celluloid/internals/uuid.rb', line 17

def self.generate
  thread = Thread.current

  unless thread.uuid_limit
    @counter_mutex.synchronize do
      block_base = @counter
      @counter += BLOCK_SIZE
      thread.uuid_counter = block_base
      thread.uuid_limit   = @counter - 1
    end
  end

  counter = thread.uuid_counter
  if thread.uuid_counter >= thread.uuid_limit
    thread.uuid_counter = thread.uuid_limit = nil
  else
    thread.uuid_counter += 1
  end

  "#{PREFIX}-#{sprintf('%012x', counter)}".freeze
end