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Starring Directed By Presented by With

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https://hschwentner.io

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@hschwentner

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! " # $

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@hschwentner

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BankAccount withdraw() deposit() Amount

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BankAccount withdraw() deposit() Amount

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@hschwentner Domain-Driven Design Eric Evans

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@hschwentner Entity vs. Value - Identity - Life cycle - Can be mutable - No identity - Always immutable Contract Map Name Length 12.5 m “John Miller”

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Entity Value Object Aggregate Service Factory Repository Tactical Design

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«Entity» BankAccount withdraw() deposit() «Value Object» Amount

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«stereotype» Value Object «stereotype» Entity ??? «stereotype» Identity

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xMolecules

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Hexagonal Architecture Layerered Architecture Onion Architecture Clean Architecture

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@hschwentner How To Express Architecture?

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class Account { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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class AccountEntity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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class Account extends Entity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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class Account extends Entity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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import org.jmolecules.ddd.types.Entity; class Account extends Entity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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@Entity class Account { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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import org.jmolecules.ddd.annotation.Entity; @Entity class Account { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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@hschwentner How To Express Architecture?

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class Account { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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class AccountEntity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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class Account : Entity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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class Account : Entity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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using NMolecules.DDD; class Account : Entity { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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[Entity] class Account { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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using NMolecules.DDD; [Entity] class Account { public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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[Entity] class Account { [Identity] public IBAN IBAN { get; } public void deposit(Amount amount) //... public void withdraw(Amount amount) //... }

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@hschwentner How To Express Architecture?

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class Account { public function deposit(Amount $amount) //... public function withdraw(Amount $amount) //... }

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class AccountEntity { public function deposit(Amount $amount) //... public function withdraw(Amount $amount) //... }

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class Account extends Entity { public function deposit(Amount $amount) //... public function withdraw(Amount $amount) //... }

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/** * @extends Entity */ class Account extends Entity { public function deposit(Amount $amount) //... public function withdraw(Amount $amount) //... }

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use PHPMolecules\DDD\Type\Entity; class Account extends Entity { public function deposit(Amount $amount) //... public function withdraw(Amount $amount) //... }

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#[Entity] class Account { public function deposit(Amount $amount) //... public function withdraw(Amount $amount) //... }

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use PHPMolecules\DDD\Annotation\Entity; #[Entity] class Account { public function deposit(Amount $amount) //... public function withdraw(Amount $amount) //... }

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@hschwentner Why Express Architecture?

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Documentation Verification Boilerplate Reduction

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@hschwentner Documentation

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@hschwentner ! " «Entity» XXX «Value Object» YYY ??

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@hschwentner Verification

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@hschwentner value Architecture Rules entity allowed forbidden

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@AnalyzeClasses(packagesOf = ArchitectureTests.class) class ArchitectureTests { @ArchTest ArchRule ddd = JMoleculesDddRules.all(); }

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PHPStan Psalm Phan PHPArkitect PHPArch

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@hschwentner Boilerplate Reduction

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@javax.persistence.Entity class BankAccount { /*...*/ } @javax.persistence.???.Embeddable class Amount { /*...*/ }

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@hschwentner jmolecules-bytebuddy jmolecules-jpa jmolecules-spring jmolecules-jackson jmolecules-intellij

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@hschwentner Boilerplate Reduction

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???

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@hschwentner nmolecules-ef nmolecules-roslyn nmolecules-rider

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@hschwentner Boilerplate Reduction

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/** * @ORM\Entity * @ORM\Table(name="bank_accounts") */ class BankAccount { /** * @ORM\Id * @ORM\GeneratedValue * @ORM\Column(type="integer") */ private IBAN iban; /*...*/ }

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@hschwentner phpmolecules-doctrine phpmolecules-symphony phpmolecules-serializer phpmolecules-phpstorm

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@hschwentner Installation

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org.jmolecules jmolecules-ddd 1.4.0

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@hschwentner Installation

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> dotnet add package NMolecules.DDD

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// Install NMolecules.DDD as a Cake Addin #addin nuget:?package=NMolecules.DDD&version=0.2.1 // Install NMolecules.DDD as a Cake Tool #tool nuget:?package=NMolecules.DDD&version=0.2.1

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@hschwentner Installation

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$ composer require --dev xmolecules/phpmolecules

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@hschwentner LeasingNinja.io

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Bibliography Evans, Eric. Domain-Driven Design: Tackling Complexity in the Heart of Software. Boston: Addison-Wesley, 2004. Hofer, Stefan and Henning Schwentner. Domain Storytelling: a Collaborative, Visual, and Agile Way to Develop Domain-Driven Software. Boston: Addison-Wesley, 2022.

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Henning Schwentner ⌂ https://hschwentner.io @hschwentner [email protected]