Celluloid & DCell

Transcript

1. Celluloid DCell &
2. @vanstee github.com/vanstee Patrick Van Stee highgroove.com
3. @tarcieri Revactor Reia nio4r Cryptosphere cool.io
4. brew install zeromq gem install dcell Setup
5. Celluloid General purpose concurrency framework for Ruby built on the Actor Model
6. class Counter attr_reader :count def initialize @count = 0 end def increment @count += 1 end end
7. class Counter attr_reader :count def initialize @count = 0 @mutex = Mutex.new end def increment @mutex.synchronize do @count += 1 end end end
8. Threads are hard!
9. class Counter include Celluloid attr_reader :count def initialize @count = 0 end def increment @count += 1 end end
10. Actor Model
11. •No shared state •Communicate with messages •Process messages sequentially
12. class Counter include Celluloid def increment(count, actor) return count if count < 10000 actor.increment( count + 1, Actor.current ) end end
13. & Asynchronous Method Calls Futures
14. counter = Counter.new # returns immediately counter.increment! puts counter.count # returns immediately future = counter.future :increment puts future.value
15. module Enumerable def map(&block) futures = map do |item| Celluloid::Future.new( item, &block ) end futures.map(&:value) end end
16. Caveats
17. • The GIL in MRI does not allow parallelism • Threads and Fibers are expensive • Concurrency is still a hard problem [not really]
18. DCell
19. Celluloid General purpose concurrency framework for Ruby built on the Actor Model DCell Distributed Celluloid over 0MQ
20. “I thought of objects being like biological cells or individual computers on a network, only able to communicate with messages. Alan Kay
21. • Exposes Actors on the Network • Send messages as you normally would
22. DRb DCell Threads Actors
23. Demo
24. Also Checkout Sidekiq
25. github.com celluloid/celluloid celluloid/dcell
26. Hack Night