lazy_loader

Lazy loading for MRI Ruby and JRuby.

Uses double-locking and a volatile variable if in JRuby, and uses ||= in MRI Ruby.

Usage

require 'lazy_loader'
require 'thread'        # for Queue

i = 0
foo = LazyLoader.create_lazy_loader do
  i += 1
  i
end

queue = Queue.new
(1..100).map do |_|
  Thread.new do
    queue << foo.get    # always 1
  end
end.each do |thread|
  thread.join
end

sum = 0
sum += queue.pop until queue.empty?
puts sum                # 100

Written for Locality
http://www.locality.com

Authors

Peter Edge
[email protected]
http://github.com/peter-edge

License

MIT