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Vertical Feature Slices Not Layers
Derek Comartin @codeopinion codeopinion.com
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Context
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Tech Clients & Server
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Authorization
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Authorization Data Access
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Authorization Data Access Validation
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Authorization Data Access Validation Business Logic
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Too Many Mixed Responsibilities
(aka Turd Pile) Authorization Data Access Validation Business Logic TIME: 8
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Layer All The Things Database ASP.NET Auth BLL DAL
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Layer All The Things ASP.NET BLL DAL Database Auth
Show all the things inside of MVC
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Server HTTP Only Clients ASP.NET Database Clients Clients Clients
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Scheduled / Reoccurring
Non HTTP Requests
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Minimize Coupling to a Framework
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Common Interface to Invoke Functionality
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Why organize by technical concerns?
Layered Technical Concerns Why organize by technical concerns?
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Simple Changes Layered DAL/ProductModel.cs DAL/ProductRepository.cs BLL/ProductManager.cs MVC/Controllers/ProductController.cs MVC/Views/Products/View.cshtml
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Layered MVC Auth BLL DAL Database Time: 17
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Request-Response Controller Uniform API Database
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CQRS Controller Request Database Auth BLL DAL Should be at 22 minutes
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Define an object that encapsulates how a set of objects interact
Mediator Pattern Define an object that encapsulates how a set of objects interact
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Mediator Pattern Object A Object B
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Mediator Pattern Object A Mediator Object B
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https://github.com/jbogard/MediatR
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Should be at 23 minutes
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Request encapsulates all information required to perform action
Mediator Pattern Request encapsulates all information required to perform action
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MediatR ASP.NET MediatR Handler Request Request
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Time: 26
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MediatR Request Caller MediatR Handler Request
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MediatR Request
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MediatR Request Handler
Caller MediatR Handler Request
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Time: 34
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MediatR Behaviors Request Pipelines Caller MediatR Pre Process Handler
Post Process Handler
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MediatR Behaviors Request Pipelines ASP.NET Core MVC MediatR Handler
Add to Cart Logger
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MediatR Notifications
Handler MediatR Notifications Publish + Subscribe Caller MediatR Handler Notification Handler TODO: Add Diagrams
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TODO: Add Diagrams
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TODO: Add Diagrams
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Organize By Layer Controllers/ShoppingCartController.cs
ViewModels/ShoppingCartViewModel.cs Models/ShoppingCart.cs Views/ShopingCart/Index.cshtml
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Organize By Feature Features ShoppingCart
AddToCart.cs RemoveFromCart.cs ViewCart.cs ViewCart.cshtml Models ShoppingCart.cs Album.cs CartItem.cs
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Organize By Layer ASP.NET MVC Authorization Validation Data Access
Time = 42 Model Database
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Organize By Feature Model Database Feature Feature Feature Feature
Time = 42 Database
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Single Feature Controller Authorization Validation Execution Model
Time = 42 Model Database
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Single Feature ASP.NET MVC Authorization Fluent Validation
Entity Framework Time = 42 Model Database
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Single Feature Nancy Authorization Validation Dapper Model Database
Time = 42 Model Database
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Success! Segregate our code from I/O MediatR between integration boundaries Feature Slices not Layers
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Trade-Offs & Notes Runtime Exceptions Tests Analyzer DI Container & Registrations
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Enabler Async, Task Queues, Pub/Sub Multiple Data Model/Stores Dependencies per Command/Query
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That’s it… Thanks! Derek Comartin @codeopinion codeopinion.com
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