Microservices for everyone
Microservices for everyone
About the Book
Microservices for everyone is a catalog of the major design choices you have to make when you're setting up a system of microservices. Amongst many things, you'll learn about asynchronous integration, independent deployability, continuous delivery, and immediate versus eventual consistency.
If you keep this book within reach, you should be able to safely navigate the daunting, yet wonderful world of microservices. Besides the basics, this book contains many references to further reading material.
What people say about this book
"This book showed me what I needed to know to actually start playing with microservices. It had the right blend of why and how without too much focus on implementation details. Highly recommended!" - Beau Simensen
"A rich and concrete resource to accompany us in the DDD / Microservices adventure!" - Sébastien Grans
"Read, Learn, Succeed! A comprehensive and really complete guide for creating microservices from scratch! Matthias can abstract the topic complexity in this book that is really, for everyone." - Christophe Willemsen
"As Microservices become more and more popular each day, it's important for professional developers to familiarize themselves with the basic concepts. As with his previous books, Matthias explains these concepts well, in a clear and concise manner. His examples are useful, and the reader is presented with a solid introduction to using Microservices. Highly recommended!" - Mark Badolato
"An excellent book which tackles the complexity of microservice architecture and provides thorough explanations of the concepts behind it. All in a concise, yet very approachable manner!" - Kamil Kokot
- Why I have to write this book
- Design guidelines for this book
- Some meta-comments
- Overview of the contents
- What is the promise of microservices?
The microservice maturity model
- Modularized Microservice Architecture
- Cohesive Microservice Architecture
- Systematized Microservice Architecture
- Taking a breath
Modularized microservice architecture
Independent deployability & Polyglotism
- Introducing Docker Engine
Managing multiple containers with Docker Compose
Overriding Compose configuration
- Environment variables
- Build configuration
- Overriding Compose configuration
- Deploying containers with Docker Machine and Docker Swarm Mode
Setting the stage for a multi-service polyglot deployment
- Docker Machine and Docker Compose
- A quick project tour
- Introducing Docker Swarm
Independent deployability—at last
- Rolling updates
Testability and independent manageability
- Improving the safety of change with Continuous Delivery
- Continuous delivery with Docker in a microservice architecture
An example of a build pipeline for one microservice
- Running the unit tests
- Running the service tests
- What else do we need in a build pipeline?
- End-to-end tests
- Independent deployability & Polyglotism
Cohesive microservice architecture
- Integration requirements
- File transfer
- Shared database
- Remote procedure invocations, or: service API integration
- Messaging integration
Characteristics of integration solutions
- Blocking versus non-blocking IO
- Synchronous versus asynchronous protocols
- Synchronous versus asynchronous integration
- The setup
- Example: Synchronous integration, synchronous protocol, blocking IO
- Intermediate example: Synchronous integration, mixed non-blocking IO
- Example: Synchronous integration, fully non-blocking IO
- The need for statelessness
Example: A circuit breaker for synchronous communication
- A flaky service
The circuit breaker in action
Example: Asynchronous integration, asynchronous protocol, blocking IO
- Setting up RabbitMQ
- The producer
Data and data formats
- Introducing the example
- Schema-less (de)serialization
- Custom (de)serialization
- Schema validation
- Validation of values
- Anemic domain model
- Rich domain model
- Persisting mutable-state objects
- Data loss
- Identity generation
- Event-sourced object design
- Event-sourced persistence
- Mutable state
Fetching information when needed
Caching HTTP responses
- Client-side cache
- Network-level cache
Get notified about new information
CQRS part I
- Example 1: Filters
- Example 2: Accumulations
- Notifications as RESTful resources
- When you don’t want to send notifications
- CQRS part I
- Fetching information when needed
- Monolith first?
- Bounded contexts
Finding service boundaries
- Existing departments
- Existing applications
- Process stages
- Team throughput
- Independence requires alignment
- Things that transcend service boundaries
- Process managers
- State changes
- Several ways to work with events
- Dispatch events internally or always publish them too?
- Eventual consistency
- Conclusion—Programming in the fourth dimension
- Communication styles
- Consider building a monolith
- Opposites and trade-offs
- Closing words
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