ActiveJob: A Service Oriented Architecture?

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ActiveJob A Service-Oriented Architecture?

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@ANDYCROLL

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ACTIVEWHATNOW?

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–DHH “The headline feature for Rails 4.2 is the brand new Active Job framework”

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class MyJob < ActiveJob::Base queue_as :queue_name def perform(active_record_object) # do stuff end end

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MyJob.perform_now(object) MyJob.perform_later(object) MyJob.set(wait_until: Date.tomorrow) .perform_later(object) MyJob.set(wait: 1.week) .perform_later(object)

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EXTRA STUFF for ACTIONMAILER

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UserMailer.hi(@user).deliver_now UserMailer.hi(@user).deliver_later

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EXTRA STUFF new GLOBAL_ID

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class MyJob < ActiveJob::Base def perform(thing_id) thing = Thing.find(thing_id) thing.do_slow_stuff end end

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class MyJob < ActiveJob::Base def perform(thing) thing.do_slow_stuff end end

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In SUMMARY? Good Thing

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SERVICE OBJECTS A SONG OF ice & fire

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There’s A LOT OF CHAT ABOUT ARCHITECTURE inside RAILS APPS

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–ME “I’m in DHH’s posse”

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but, Everyone Loves a PORO

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PLAIN OLD RUBY OBJECTS

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WHEN TO USE? • The action is complex • The action reaches across multiple models • The action interacts with an external service • The action is not a core concern of the underlying model blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/

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CONVENTIONS • app/services/ • Verbs for naming • Typically one public method per class • Do one ‘business thing’

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class AcceptInvite def initialize(invite, user) @invite = invite @user = user end def accept invite.accept(@user) log_acceptance(@invite, @user) UserMailer.welcome(@user).deliver AdminMailer.invited(@user).deliver end end

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Invite::Accept = Struct.new(:invite, :user) do def run invite.accept(user) log_acceptance(invite, user) UserMailer.welcome(user).deliver AdminMailer.invited(user).deliver end end

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class InviteAccepterService def initialize(invite, user, logger = MyLogger.new) @invite, @user, @logger = invite, user, logger end def process invite.accept(@user) log_acceptance(@invite, @user) UserMailer.welcome(@user).deliver AdminMailer.invited(@user).deliver end def log_acceptance @logger.acceptance(@invite, @user) end end

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class AcceptInvite def self.call(invite, user) invite.accept(user) log_acceptance(invite, user) UserMailer.welcome(user).deliver AdminMailer.invited(user).deliver end end #=> AcceptInvite.(invite, user)

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And ONE MORE…

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class AcceptInvite < ActiveJob::Base def perform(invite, user) invite.accept(user) log_acceptance(invite, user) UserMailer.welcome(user).deliver_now AdminMailer.invited(user).deliver_now end end LOOK!

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ACTIVEJOB    SERVICES

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SERVICES • The action is complex • The action reaches across multiple models • The action interacts with an external service • The action is not a core concern of the underlying model

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JOBS • The action is complex • The action reaches across multiple models • The action interacts with an external service • The action is not a core concern of the underlying model

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SERVICES • app/services/ • Verbs • Typically one public method per class • Do one ‘business thing’

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SERVICES & JOBS • app/services/ • Verbs • Typically one public method per class • Do one ‘business thing’ • app/jobs/ • Verbs • One ‘perform’ method defined per class • Do one ‘business thing’ • Async or sync, bonus!

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…caveats

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SOME Final THOUGHTS

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class InviteController < ApplicationController def accept AcceptInvite.perform_now(Invite.find(params[:id]), current_user) redirect_to somewhere_else_path end end class AcceptInvite < ActiveJob::Base def perform(invite, user) invite.accept(user) log_acceptance(invite, user) UserMailer.welcome(user).deliver_now AdminMailer.invited(user).deliver_now end end

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class InviteController < ApplicationController def accept invite = Invite.find(params[:id] invite.accept(current_user) log_acceptance(invite, current_user) UserMailer.welcome(current_user).deliver_later AdminMailer.invited(current_user).deliver_later redirect_to somewhere_else_path end end

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