ActionCable vs. Socket.io at ConFoo

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ActionCable vs. Socket.io @RayHightower ConFoo - Dec 5-7, 2016 Vancouver, BC Canada

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What? Why? Examples. Comparison.

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ActionCable is… •Real time. •Full duplex. •Event based.

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Half Duplex Walkie-Talkie Full Duplex Phone

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HTTP is stateless.

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https://xkcd.com/869/

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WebSocket Protocol

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REmote DIctionary Server

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In-memory Key-value store Dictionary Hash {

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pub/sub

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Channels: Clients Rooms: Server

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Create the app.

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Generate the rooms controller.

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Generate the channel.

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Create a home for the messages in the database.

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Remember the migration!

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1 Rails.application.routes.draw do 2 get 'rooms/show' 3 4 end 1 Rails.application.routes.draw do 2 root to: ‘rooms#show' 3 4 end conﬁg/routes.rb (before & after)

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1 class RoomsController < ApplicationController 2 def show 3 @messages = Message.all 4 end 5 end app/controllers/rooms_controller.rb (before & after) 1 class RoomsController < ApplicationController 2 def show 3 end 4 end

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app/channels/rooms_channel.rb 1 # Be sure to restart your server when you modify… 2 class RoomChannel < ApplicationCable::Channel 3 def subscribed 4 # stream_from "some_channel" 5 end 6 7 def unsubscribed 8 # Any cleanup needed when channel is unsubscribed 9 end 10 11 def speak 12 end 13 end

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The Remarkable Journey of a Single Web Request by Aaron Kalin https://windycityrails.com/videos/2015/#9

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Another chat app?

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Gartner Hype Cycle Image by Jeremy Kemp https://commons.wikimedia.org/wiki/File:Gartner_Hype_Cycle.svg

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Gartner Hype Cycle ActionCable Slope of Enlightenment?

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WebSockets and Robotics

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Remotely Operated Vehicle

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Browser BeagleBone Black Arduino Socket.io Serial Node.js Chrome C++

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Browser BeagleBone Black Arduino ActionCable Serial Ruby Chrome C++

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Comparison

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•ActionCable is… •Socket.io is…

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YACA OpenROV vs.

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Fitness for a particular purpose.

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Thanks! RayHightower.com