PHP Barcelona Monthly Talk Feb 2015
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Talk about simplicity and DDD and how we are applying this concepts in Akamon Backend Project: Horus
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PHP Barcelona Monthly Talk Feb 2015
- 1. (println "Hello World! :)")
- 2. DDD as an implementation detail Eloi Poch Sergi González
- 3. Who$are$we?$ $ ! es.linkedin.com/in/eloipoch/$ $ $ @eloipoch$ $ Eloi.poch@akamon.com$ Eloi!Poch! ! Technical!Lead!at!@Akamon! • So8ware$Developer$ • Clojure$developer$wannabe$ • Want$to$code$in$Castefa$beach$while$drinking$wine$
- 4. (conj '(1 2 3) 4)
- 5. Who$are$we?$ $ ! es.linkedin.com/in/sergigp/$ $ $ “SergiGP$ $ Sergi.gonzalez@akamon.com$ Sergi! ! Technical!Lead!at!@Akamon! • So<ware$Developer$ • Chief$Trolling$Officer$ • Two$animals$remaining$to$have$an$urban$zoo$
- 7. Akamon
- 8. A little bit on Akamon before we deal with the technical stuff
- 13. Technically …
- 14. Flash Client Game Server Backend AS3 Nova Java JReactive & Vertx PHP Horus
- 16. @eloipoch @jordillonch @SergiGP @jorgeavila_ss @jdiezc @jvalduvieco @amassa5 Who we are? The backend team
- 19. Performance Big Data Difficult Algorithms Concurrency Real time analytics Scalability
- 20. The ugly truth…
- 22. Code Complexity Big ball of mud Shared State Coupling
- 26. Tackling Complex Code The Philosophy
- 27. Simple made Easy
- 29. Simple vs Easy $mysqli = new mysqli("localhost", "horus", "olakease", “suite"); $mysqli->query("INSERT INTO users …”)) SIMPLE EASY /** * @ORMEntity * @ORMTable(name="product") */ class Product
- 30. $sum = function ($carry, $item) { return $carry + $item; } array_reduce([1, 2, 3], $sum); $acc = 0; foreach ([1, 2, 3] as $value) { $acc += $value; } SIMPLE EASY Simple vs EasySimple vs Easy
- 31. $acc = 0; foreach ([1, 2, 3] as $value) { $acc += $value; } SIMPLE EASY (reduce + [1 2 3]) Simple vs EasySimple vs Easy
- 32. Simplicity vs Easiness • Easy to understand • Easy to debug • Easy to change, flexibility, maintenable • Easy to use • Hard to debug • Hard to change
- 33. Complected • Something does more than one thing and you can’t split it easily • Source of accidental complexity • DON’T DO IT
- 35. Do not complect, compose
- 36. Tackling Complex Code The Theory
- 38. Pair Programming
- 39. Pull Requests
- 40. Code Reviews
- 42. Self Empowerment Never ask for permission unless it would be reckless not to
- 43. Trust Great teams are unafraid to air their dirty laundry, admit their mistakes, their weaknesses and their concerns without fear. Patrick Lencioni
- 44. Technical Level
- 45. Lean Approach
- 47. YAGNI You Aren’t Gonna Need It
- 48. DDD Concepts
- 49. • DDD Tactical: • Application Services • Domain Services • Domain Events • Repositories • AR & VO • DDD Strategical: • Modules • Bounded Contexts • SubDomains • Context Maps
- 50. CQRS Concepts
- 54. TDD & BDD
- 56. Tackling Complex Code The Practice
- 63. ProductId Product Description Product Price Stores Product Benefit Product Image Description Name Currency Amount Coins StoreId Image Url Pricing/Sales BC Product BC
- 64. Product Id BenefitId Product Price ProductId Amount Currency Product Description ProductId Name Description Product Benefit Id Amount VirtualMoneyId Product Store ProductId StoreId
- 66. HORUS
- 67. Big Picture • Directories: 773 • Files: 1501 • Lines of code: 113885 • Non-Comment Lines of Code: 88806 (80%) • Average Class Length: 14 lines • Average Method Length: 2 lines • Cyclomatic Complexity / LLOC: 0.06 • Cyclomatic Complexity / Number of Methods: 1.21 HORUS
- 68. Big Picture of our Code in Horus • Directories: 773 / 558 • Files: 1501 / 1001 • Lines of code: 113885 / 41205 • Non-Comment Lines of Code: 88806 (80%) / 38045 (92%) • Average Class Length: 14 lines / 5 lines • Average Method Length: 2 lines / 2 lines • Cyclomatic Complexity / LLOC: 0.06 / 0.03 • Cyclomatic Complexity / Number of Methods: 1.21 / 1.14
- 70. UserPostController Command Bus UserRegistratorCommandHandler UserRegistrator Domain Event Publisher UserRegisteredDomainEv entSubscriber UserAccountOpener User UserRepository Event Subscribers . . . POST /users [ userId: 0db90987-5ce1-4683-bb05-7d1b5539cb0b ] Command Handlers . . . UserRegisteredDomainEvent User HORUS BASIC REQUEST UserRegistrationCommand UserRegistrationCommand userId analyticsContextId userId analyticsContextId UserRegisteredDomainEvent userId analyticsContextId id (Economy Account)
- 71. UserPostController Command Bus UserRegistratorCommandHandler UserRegistrator Domain Event Publisher UserRegisteredDomainEv entSubscriber UserAccountOpener User UserRepository Event Subscribers . . . POST /users [ userId: 0db90987-5ce1-4683-bb05-7d1b5539cb0b ] Command Handlers . . . UserRegisteredDomainEvent User HORUS BASIC REQUEST UserRegistrationCommand UserRegistrationCommand userId analyticsContextId userId analyticsContextId UserRegisteredDomainEvent userId analyticsContextId id (Economy Account) UserModule EconomyModule
- 74. Tackling Complex Code The Conclusions
- 75. Mistakes • Do not store domain events • Own libraries for CQRS & DDD • Do not use Domain Services • Domain events with wrong identifiers • Couple App Services to Commands & Queries • Not start earlier some Modules/Bounded Contexts
- 76. Mistakes • Let the DB guide us • Let the framework guide us
- 77. Problems • Domain Events: Lost of order (async) • Doctrine • Unit Of Work + Integration Test = Fail • Embedded: Identifier or not • Behat: The Container
- 78. Tips & Tricks • Repositories: • Just add, save and find • Use of DQL implies the schema is too complex • Controllers: 50 lines of code • Application Services: Avoid business logic • One step at time: Hex. Arch. -> DDD -> CQRS -> ES? • Start it as a Module and promote it later to BC