Hands-On Domain-Driven Design with .NET Core电子书

Dedication

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Contributors

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Preface

Who this book is for

What this book covers

To get the most out of this book

Download the example code files

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Conventions used

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Why Domain-Driven Design?

Understanding the problem

Problem space and solution space

What went wrong with requirements

Dealing with complexity

Types of complexity

Categorizing complexity

Decision making and biases

Knowledge

Domain knowledge

Avoiding ignorance

Summary

Further reading

Language and Context

Ubiquitous Language

Domain language

Sample application domain

Making implicit explicit

Domain language for classified ads

Language and context

Summary

EventStorming

EventStorming

Modeling language

Visualization

Facilitating an EventStorming workshop

Who to invite

Preparing the space

Materials

The room

The workshop

Timing and scheduling

The beginning

During the workshop

After the workshop

Our first model

Summary

Further reading

Designing the Model

Domain model

What does the model represent?

Anemic domain model

Functional languages and anemic models

What to include in the domain model

Design considerations

CQRS

Design-level EventStorming

Getting deeper knowledge

Preparation for the workshop

Extended notation

Commands

Read models

Users

Policies

All together now

Modeling the reference domain

Summary

Further reading

Implementing the Model

Technical requirements

Starting up the implementation

Creating projects

The framework

Transferring the model to code

Entities

Identities

Classified ad entity

Adding behavior

Ensuring correctness

Constraints for input values

Value objects

Factories

Domain services

Entity invariants

Domain events in code

Domain events as objects

Raising events

Events change state

Summary

Acting with Commands

Technical requirements

Outside the domain model

Exposing the web API

Public API contracts

HTTP endpoints

Application layer

Handling commands

The command handler pattern

Application service

Summary

Consistency Boundary

Technical requirements

Domain model consistency

Transaction boundaries

Aggregate pattern

Protecting invariants

Analyzing constraints for a command

Enforcing the rules

Entities inside an aggregate

Summary

Aggregate Persistence

Technical requirements

Aggregate persistence

Repository and units of work

Implementation for RavenDB

Implementation of Entity Framework Core

Summary

CQRS - The Read Side

Technical requirements

Adding user profiles

User profile domain concerns

Domain project organization

Adding new value objects

User profile aggregate root

Application side for the user profile

The query side

CQRS and read-to-write mismatch

Queries and read models

Implementing queries

Query API

Queries with RavenDB

Queries with Entity Framework

Summary

Event Sourcing

Technical requirements

Why Event Sourcing

Issues with state persistence

What is Event Sourcing?

Event Sourcing around us

Event Sourced aggregates

Event streams

Event stores

Event-oriented persistence

Writing to Event Store

Reading from Event Store

The wiring infrastructure

The aggregate store in application services

Running the event-sourced app

Summary

Further reading

Projections and Queries

Events and queries

Building read models from events

Projections

Subscriptions

Implementing projections

Catch-up subscriptions

Cross-aggregate projections

Projecting events from two aggregates

Multiple projections per subscription

Event links and special streams

Enriching read models

Querying from a projection

Upcasting events

Persistent storage

Checkpoints

Persisting read models

Wrapping up

Summary

Bounded Context

The single model trap

Starting small

Complexity, again

Big ball of mud

Structuring systems

Linguistic boundaries

Team autonomy

Limiting work in progress

Improving throughput

Conway's law

Loose coupling, high alignment

Geography

Summary

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