conventions between applications
TRANSCRIPT
Conventions Between Applications
Michael Ries @mmmries
http://www.rubyfuza.org/images/speakers/2015/charles_nutter.jpghttps://scontent-sjc.cdninstagram.com/hphotos-xaf1/t51.2885-15/10838508_854030257976849_260521776_n.jpg
Distributed System?Made of multiple applications working together
2012 => 254 deploys/yr 2014 => 1,884 deploys/yrWhat we learned along the way
everywhere on the internet
Make a DirectoryPublish Events
Deploy Small Changes
Sample Project
When a user is deleted we will cleanup their data
Abacus Amigo
Sherlock BallistaDispatch
Bunyan
Grunt
Newman PersonaRelay Synchro
HulkWormholeFirefly Dunaway AlfredBatcave
Bullseye
The Directory
Easily Navigable by Humans Used By Production Code
http://media.tumblr.com/f9b5d822e963e6f6fc7fe7008b5ee8aa/tumblr_inline_mhbi8egCJz1qz4rgp.gif
Atlas - The Directory
Protobuf (https://developers.google.com/protocol-buffers/) Map Resources to Applications Private Gem
Message Schema Migrations
Backwards Compatible Changes
Deprecations => Backwards Incompatible Changes
User (1.0.0)
guid name
User (1.0.0)
guid name
Amigo NewmanUserSearch
User (1.0.0)
User (1.0.0)
guid name
Amigo Newman
User (1.1.0)
guid name email
UserSearch
User (1.1.0) ?✔
User (1.0.0)
guid name
Amigo Newman
User (1.1.0)
guid name email
User (1.0.0)
guid name
Amigo Newman
User (2.0.0) guid name email
first_name
UserSearch
User (2.0.0) ?X
User (1.0.0)
guid name
Amigo Newman
User (1.2.0) guid
name (deprecated) email
first_name
User (1.0.0)
guid name
Amigo Newman
User (1.2.0) guid
name (deprecated) email
first_name
UserSearch
User (1.2.0) ✔
Newman
User (1.2.0) guid
name (deprecated) email
first_name
newman$ rspec.........DEPRECATION WARNING: Atlas::Amigo::User#name field usage is deprecated. (called from update at /Users/hqmq/code/newman/app/services/atlas/newman/notification_service.rb:26)
The DirectoryNavigable by Team Members Used by Production Code Message Schema
Well-defined Migration Semantics
Abacus Amigo
Sherlock BallistaDispatch
Bunyan
Grunt
Newman PersonaRelay Synchro
HulkWormholeFirefly Dunaway AlfredBatcave
Bullseye
Amigo
User
Client
Amigo
User
Abacus
AccountX X
Amigo
User
Abacus
AccountX X
Newman
Notification
Persona
MemberX X
https://pbs.twimg.com/profile_images/2694242404/5b0619220a92d391534b0cd89bf5adc1_400x400.jpeg
Events
Low Coupling Similar To Controller
Amigo
User
Abacus
AccountX X
Newman
Notification
Persona
MemberX X
Amigo
User X
amigo.user.deleted
Amigo
User
Abacus
Account
Newman
Notification
Persona
Member
X X
X
X
Abacus
Newman
Persona
Firefly
Abacus
Abacus
Abacus
Abacus
Abacus
Abacus
Abacus
Abacus
Abacus
ActionSubscriber
https://github.com/moneydesktop/action_subscriberhttp://hackers.lookout.com/images/jruby_large.png
https://cdn.tutsplus.com/net/uploads/legacy/ 966_essentialReading/images/rubylang.png
class UserSubscriber < ActionSubscriber::Base
def deleted user = payload # Atlas::Amigo::User
delete_accounts_for_user(user.guid) end
end
ActionPublisher
Coming Soon…
ActionPublisher
class User < ActiveRecord::Base include ActionPublisher::Syncable
... other code ... end
EventsLow Coupling Similar To Controller Opt-in To Messages 1 Message Per Application
Amigo
User
Abacus
Account
Newman
Notification
Persona
Member
X X
X
X
Amigo Abacus Persona
Publish user.deleted message
Cleanup Accounts
on user.deleted
Cleanup Members
on user.deleted
Newman
Cleanup Notifications
on user.deleted
4 Tasks???
Cohesive Code Code Review Deploys Overhead
Deployment CostsDeveloper Time Developer Interruption System downtime
Zero-Downtime Matters
2012 2013 2014254 Deploys 1,597 Deploys 1,884 Deploys
Zero Downtime Implemented
TrebuchetExtension to Capistrano Deploy 1-by-1 Deploy in groups
Small DeploysCohesive Codebases Automate Deploys Minimize Cost (interruption/time) Minimize Risk
Code Review++
Make a DirectoryPublish Events
Deploy Small Changes
Team >> TechShared Ownership Teaching / Learning Discipline
http://gifrific.com/wp-content/uploads/2012/04/Punch-After-Celebration.gif
End
Michael Ries @mmmries