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Никита Соболев github.com/sobolevn

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Вы неправильно поняли DDD

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Domain Driven Design

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Focus on the core domain; explore models in a creative collaboration of domain practitioners and software practitioners; and speak a ubiquitous language within an explicitly bounded context — Eric Evans youtube.com/watch?v=R2IAgnpkBck

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– Сергей, сделай мне отчет по транзакциям

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Как такая проблема вообще возникла?

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1968 • Программистов нет • Код пишут специалисты из предметной области • Каждый отвечает за свой участок youtube.com/watch?v=XH_awPS6hK4

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⚙

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Инструмент технического общения Тайный!

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Through domain models, software developers are able to express rich functionality and translate it into a software implementation that truly serves the needs of its users — Eric Evans

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defmodule Projects.Entities.Project do schema "projects" do field :url, :string many_to_many :participants, User, join_through: UserProject, on_replace: :delete end end Project

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- Let project's participants copy URL

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- Let project's participants copy URL field :url, :string

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- Let project's participants copy URL field :url, :string many_to_many :participants, User

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- Let project's participants copy URL Projects.Entities.Project field :url, :string many_to_many :participants, User

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defmodule Kira.Usecases.AssignUserToTask do @moduledoc """ We need to assign free `User`s to the most important tasks. We mean `Issue` and `Merge Request` by tasks. Different tasks have different priorities. """ operation(Kira.Projects.Services.FindTaskToAssign) operation(Kira.Accounts.Queries.FindFreeDeveloper) operation(Kira.Accounts.Commands.AssignDeveloper) end Появляются сложные концепции

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defmodule Kira.Usecases.AssignUserToTask do @moduledoc """ We need to assign free `User`s to the most important tasks. We mean `Issue` and `Merge Request` by tasks. Different tasks have different priorities. """ operation(Kira.Projects.Services.FindTaskToAssign) operation(Kira.Accounts.Queries.FindFreeDeveloper) operation(Kira.Accounts.Commands.AssignDeveloper) end Варианты использования

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defmodule Kira.Usecases.AssignUserToTask do @moduledoc """ We need to assign free `User`s to the most important tasks. We mean `Issue` and `Merge Request` by tasks. Different tasks have different priorities. """ operation(Kira.Projects.Services.FindTaskToAssign) operation(Kira.Accounts.Queries.FindFreeDeveloper) operation(Kira.Accounts.Commands.AssignDeveloper) end Контексты

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defmodule Kira.Usecases.AssignUserToTask do @moduledoc """ We need to assign free `User`s to the most important tasks. We mean `Issue` and `Merge Request` by tasks. Different tasks have different priorities. """ operation(Kira.Projects.Services.FindTaskToAssign) operation(Kira.Accounts.Queries.FindFreeDeveloper) operation(Kira.Accounts.Commands.AssignDeveloper) end Сервисы

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defmodule Kira.Usecases.AssignUserToTask do @moduledoc """ We need to assign free `User`s to the most important tasks. We mean `Issue` and `Merge Request` by tasks. Different tasks have different priorities. """ operation(Kira.Projects.Services.FindTaskToAssign) operation(Kira.Accounts.Queries.FindFreeDeveloper) operation(Kira.Accounts.Commands.AssignDeveloper) end Запросы

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defmodule Kira.Usecases.AssignUserToTask do @moduledoc """ We need to assign free `User`s to the most important tasks. We mean `Issue` and `Merge Request` by tasks. Different tasks have different priorities. """ operation(Kira.Projects.Services.FindTaskToAssign) operation(Kira.Accounts.Queries.FindFreeDeveloper) operation(Kira.Accounts.Commands.AssignDeveloper) end Команды

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Usecase Command Query CQRS Event Sourcing Entity Domain Model Value Object Service Agregate Root Bounded Context Context Agregate

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Usecase Command Query CQRS Event Sourcing Entity Domain Model Value Object Service Agregate Root Bounded Context Context Agregate

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Usecase Command Query CQRS Event Sourcing Entity Domain Model Value Object Service Agregate Root Bounded Context Context Agregate

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github.com/johnnncodes/ ddd-python-django

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class Ticket(object): __uuid = None def __init__(self, uuid, title, body, customer_id): self.set_uuid(uuid) self.set_title(title) self.set_body(body) self.set_customer_id(customer_id) def set_title(self, title): self.__title = title def get_title(self): return self.__title def set_body(self, body): self.__body = body

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github.com/commanded/ commanded

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Как так получилось?

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Как все те умные слова относятся к вашей предметной области?

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Никак!

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Инструмент технического общения

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Архитектурные паттерны Предметная область

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Архитектурные паттерны Предметная область

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Например, микросервисы youtube.com/watch? v=yPvef9R3k-M

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"DDD Framework"

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Что важно? •Быстрая обратная связь •Общая терминология •Понятные требования

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– Никита, мне нужен инструмент для автоматизации работы программистов

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Термины и связи

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sphinx-doc.org

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class AwesomeRule(object): """Implementation of :term:`rule` ..."""

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Сделал – получил обратную связь!

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Показал – обновил

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BDD

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Еще один неправильно понятный инструмент для общения

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Feature: Tracking issues progress As an architect I want to have information about Gitlab issues So that I can overview and track the issues' progress Scenario: new valid issue webhook is received Given issue webhook is valid And issue webhook is authenticated When it is received Then a new issue is created Scenario: new invalid issue webhook is received Given issue webhook is not valid When it is received Then no issue is created

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pypi.org/project/pytest-bdd

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sobolevn.me/2019/02/ engineering-guide-to- user-stories

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Мы понимаем что делать

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Заказчик понимаем, что мы делаем

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Сделал – получил обратную связь!

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Мы можем быть уверены: работает, то, так

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Выводы •DDD позволяет людям понять друг друга •DDD поднимает сознательность, заставляет думать про бизнес •DDD позволяет быстрее решать задачи •DDD заставляет думать про архитектуру

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Материалы •DDD EU •twitter.com/DDD_Borat •fsharpforfunandprofit.com/ddd/ •fideloper.com/hexagonal-architecture •martinfowler.com/eaaCatalog/index.html •github.com/heynickc/awesome-ddd •github.com/dry-python

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Вопросы? github.com/sobolevn sobolevn.me