A Crash Course on Celluloid (GoGaRuCo 2012)

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A Crash Course on Tony Arcieri GoGaRuCo September 15th, 2012 Saturday, September 15, 12

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Saturday, September 15, 12

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We’re hiring! Saturday, September 15, 12

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“Threads on Rails!” Saturday, September 15, 12

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Sidekiq What if 1 Sidekiq process could do the work of 20 Resque processes? http://mperham.github.com/sidekiq/ Saturday, September 15, 12

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OOP + Actor Model Saturday, September 15, 12

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“I thought of objects being like biological cells and/or individual computers on a network, only able to communicate with messages” - Alan Kay, creator of Smalltalk, on the meaning of "object oriented programming" Saturday, September 15, 12

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Active Objects Based on the Actor Model Saturday, September 15, 12

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Saturday, September 15, 12

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Saturday, September 15, 12

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Actor Model •Actors are computational entities that can receive messages •Each actor has a unique address •If you know an actor’s address, you can send it messages •Actors can create new actors Saturday, September 15, 12

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I’m not the ﬁrst to do Actor Model + OOP Saturday, September 15, 12

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Saturday, September 15, 12

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Forgotten approach to concurrency? Saturday, September 15, 12

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Example Saturday, September 15, 12

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require 'celluloid' class Launcher include Celluloid def launch 3.downto(1) do |count| puts "#{count}..." sleep 1 end puts "BLASTOFF!" end end Saturday, September 15, 12

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require 'celluloid' class Launcher include Celluloid def launch 3.downto(1) do |count| puts "#{count}..." sleep 1 end puts "BLASTOFF!" end end Saturday, September 15, 12

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>> launcher = Launcher.new => # Saturday, September 15, 12

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Synchronous Calls Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.launch Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.launch 3... Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.launch 3... 2... Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.launch 3... 2... 1... Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.launch 3... 2... 1... BLASTOFF! => nil >> Saturday, September 15, 12

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&DOOHU &HOOXORLG $FWRU3UR[\ &$// 5HFHLYHU &HOOXORLG 0DLOER[ 5(63216( &HOOXORLG 0DLOER[ &HOOXORLG$FWRU &HOOXORLG&DOO &HOOXORLG5HVSRQVH Synchronous Calls Saturday, September 15, 12

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Asynchronous Calls Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch New syntax! Saturday, September 15, 12

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THEY TOOK ‘ER BANG METHERDS!!!!! Saturday, September 15, 12

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You’ll get them back in Celluloid 1.0 Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch => nil >> Returns immediately Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch => nil >> 3... Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch => nil >> 3... 2... Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch => nil >> 3... 2... 1... Saturday, September 15, 12

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>> launcher = Launcher.new => # >> launcher.async.launch => nil >> 3... 2... 1... BLASTOFF! Saturday, September 15, 12

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Asynchronous Calls &DOOHU &HOOXORLG $V\QF3UR[\ &$// 5HFHLYHU &HOOXORLG 0DLOER[ &HOOXORLG$FWRU &HOOXORLG&DOO Saturday, September 15, 12

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Futures Saturday, September 15, 12

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class FibonacciWorker include Celluloid def fib(n) n < 2 ? n : fib(n-1) + fib(n-2) end end Saturday, September 15, 12

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>> worker = FibonacciWorker.new => # >> future = worker.future.fib(40) => # Saturday, September 15, 12

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>> worker = FibonacciWorker.new => # >> future = worker.future.fib(40) => # Returns immediately Saturday, September 15, 12

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>> worker = FibonacciWorker.new => # >> future = worker.future.fib(40) => # >> future.value Saturday, September 15, 12

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>> worker = FibonacciWorker.new => # >> future = worker.future.fib(40) => # >> future.value Blocks until complete Saturday, September 15, 12

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>> worker = FibonacciWorker.new => # >> future = worker.future.fib(40) => # >> future.value => 102334155 Saturday, September 15, 12

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&DOOHU &HOOXORLG $FWRU3UR[\ 5HFHLYHU &HOOXORLG 0DLOER[ &HOOXORLG$FWRU &HOOXORLG&DOO &$// &HOOXORLG 0DLOER[ )8785( &HOOXORLG )XWXUH &HOOXORLG5HVSRQVH 9$/8(" 9$/8( Futures Saturday, September 15, 12

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Pools Saturday, September 15, 12

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>> pool = FibonacciWorker.pool(size: 16) => # Saturday, September 15, 12

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>> pool = FibonacciWorker.pool => # 1 actor per CPU (by default) Saturday, September 15, 12

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>> pool = FibonacciWorker.pool => # >> (32...40).map { |n| pool.future.fib(n) }.map(&:value) Saturday, September 15, 12

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>> pool = FibonacciWorker.pool => # >> (32...40).map { |n| pool.future.fib(n) }.map(&:value) => [2178309, 3524578, 5702887, 9227465, 14930352, 24157817, 39088169, 63245986] Saturday, September 15, 12

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Beware the GIL •YARV can do parallel I/O in threads •...but NOT parallel computation (e.g. ﬁb) •JRuby and Rubinius will light up all your cores :) Saturday, September 15, 12

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Twitter: @bascule @celluloidrb Celluloid: celluloid.io Blog: unlimitednovelty.com Saturday, September 15, 12