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Chris Richardson Chris Richardson MANNING www.EBooksWorld.ir List of Patterns Application architecture patterns External API patterns Monolithic architecture (40) API gateway (259) Microservice architecture (40) Backends for frontends (265) Decomposition patterns Testing patterns Decompose by business capability (51) Consumer-driven contract test (302) Decompose by subdomain (54) Consumer-side contract test (303) Service component test (335) Messaging style patterns Messaging (85) Security patterns Remote procedure invocation (72) Access token (354) Reliable communications patterns Cross-cutting concerns patterns Circuit breaker (78) Externalized configuration (361) Microservice chassis (379) Service discovery patterns 3rd party registration (85) Observability patterns Client-side discovery (83) Application metrics (373) Self-registration (82) Audit logging (377) Server-side discovery (85) Distributed tracing (370) Exception tracking (376) Transactional messaging patterns Health check API (366) Polling publisher (98) Log aggregation (368) Transaction log tailing (99) Transactional outbox (98) Deployment patterns Deploy a service as a container (393) Data consistency patterns Deploy a service as a VM (390) Saga (114) Language-specific packaging format (387) Service mesh (380) Business logic design patterns Serverless deployment (416) Aggregate (150) Sidecar (410) Domain event (160) Domain model (150) Refactoring to microservices patterns Event sourcing (184) Anti-corruption layer (447) Transaction script (149) Strangler application (432) Querying patterns API composition (223) Command query responsibility segregation (228) www.EBooksWorld.ir Microservices Patterns www.EBooksWorld.ir www.EBooksWorld.ir Microservices Patterns WITH EXAMPLES IN JAVA CHRIS RICHARDSON MANNING SHELTER ISLAND www.EBooksWorld.ir For online information and ordering of this and other Manning books, please visit www.manning.com. The publisher offers discounts on this book when ordered in quantity. For more information, please contact Special Sales Department Manning Publications Co. 20 Baldwin Road PO Box 761 Shelter Island, NY 11964 Email: [email protected] ©2019 by Chris Richardson. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by means electronic, mechanical, photocopying, or otherwise, without prior written permission of the publisher. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in the book, and Manning Publications was aware of a trademark claim, the designations have been printed in initial caps or all caps. Recognizing the importance of preserving what has been written, it is Manning’s policy to have the books we publish printed on acid-free paper, and we exert our best efforts to that end. Recognizing also our responsibility to conserve the resources of our planet, Manning books are printed on paper that is at least 15 percent recycled and processed without the use of elemental chlorine. Manning Publications Co. Development editor: Marina Michaels 20 Baldwin Road Technical development editor: Christian Mennerich PO Box 761 Review editor: Aleksandar Dragosavljevic´ Shelter Island, NY 11964 Project editor: Lori Weidert Copy editor: Corbin Collins Proofreader: Alyson Brener Technical proofreader: Andy Miles Typesetter: Dennis Dalinnik Cover designer: Marija Tudor ISBN: 9781617294549 Printed in the United States of America 12345678910–DP–232221201918 www.EBooksWorld.ir Where you see wrong or inequality or injustice, speak out, because this is your country. This is your democracy. Make it. Protect it. Pass it on. — Thurgood Marshall, Justice of the Supreme Court www.EBooksWorld.ir www.EBooksWorld.ir brief contents 1 ■ Escaping monolithic hell 1 2 ■ Decomposition strategies 33 3 ■ Interprocess communication in a microservice architecture 65 4 ■ Managing transactions with sagas 110 5 ■ Designing business logic in a microservice architecture 146 6 ■ Developing business logic with event sourcing 183 7 ■ Implementing queries in a microservice architecture 220 8 ■ External API patterns 253 9 ■ Testing microservices: Part 1 292 10 ■ Testing microservices: Part 2 318 11 ■ Developing production-ready services 348 12 ■ Deploying microservices 383 13 ■ Refactoring to microservices 428 vii www.EBooksWorld.ir www.EBooksWorld.ir contents preface xvii acknowledgments xx about this book xxii about the cover illustration xxvi Escaping monolithic hell 1 1 1.1 The slow march toward monolithic hell 2 The architecture of the FTGO application 3 ■ The benefits of the monolithic architecture 4 ■ Living in monolithic hell 4 1.2 Why this book is relevant to you 7 1.3 What you’ll learn in this book 7 1.4 Microservice architecture to the rescue 8 Scale cube and microservices 8 ■ Microservices as a form of modularity 11 ■ Each service has its own database 12 The FTGO microservice architecture 12 ■ Comparing the microservice architecture and SOA 13 1.5 Benefits and drawbacks of the microservice architecture 14 Benefits of the microservice architecture 14 ■ Drawbacks of the microservice architecture 17 ix www.EBooksWorld.ir x CONTENTS 1.6 The Microservice architecture pattern language 19 Microservice architecture is not a silver bullet 19 ■ Patterns and pattern languages 20 ■ Overview of the Microservice architecture pattern language 23 1.7 Beyond microservices: Process and organization 29 Software development and delivery organization 29 ■ Software development and delivery process 30 ■ The human side of adopting microservices 31 Decomposition strategies 33 2 2.1 What is the microservice architecture exactly? 34 What is software architecture and why does it matter? 34 Overview of architectural styles 37 ■ The microservice architecture is an architectural style 40 2.2 Defining an application’s microservice architecture 44 Identifying the system operations 45 ■ Defining services by applying the Decompose by business capability pattern 51 Defining services by applying the Decompose by sub-domain pattern 54 ■ Decomposition guidelines 56 ■ Obstacles to decomposing an application into services 57 ■ Defining service APIs 61 Interprocess communication in a microservice architecture 65 3 3.1 Overview of interprocess communication in a microservice architecture 66 Interaction styles 67 ■ Defining APIs in a microservice architecture 68 ■ Evolving APIs 69 ■ Message formats 71 3.2 Communicating using the synchronous Remote procedure invocation pattern 72 Using REST 73 ■ Using gRPC 76 ■ Handling partial failure using the Circuit breaker pattern 77 ■ Using service discovery 80 3.3 Communicating using the Asynchronous messaging pattern 85 Overview of messaging 86 ■ Implementing the interaction styles using messaging 87 ■ Creating an API specification for a messaging-based service API 89 ■ Using a message broker 90 Competing receivers and message ordering 94 ■ Handling duplicate messages 95 ■ Transactional messaging 97 Libraries and frameworks for messaging 100 www.EBooksWorld.ir CONTENTS xi 3.4 Using asynchronous messaging to improve availability 103 Synchronous communication reduces availability 103 Eliminating synchronous interaction 104 Managing transactions with sagas 110 4 4.1 Transaction management in a microservice architecture 111 The need for distributed transactions in a microservice architecture 112 ■ The trouble with distributed transactions 112 ■ Using the Saga pattern to maintain data consistency 114 4.2 Coordinating sagas 117 Choreography-based sagas 118 ■ Orchestration-based sagas 121 4.3 Handling the lack of isolation 126 Overview of anomalies 127 ■ Countermeasures for handling the lack of isolation 128 4.4 The design of the Order Service and the Create Order Saga 132 The OrderService class 133 ■ The implementation of the Create Order Saga 135 ■ The OrderCommandHandlers class 142 The OrderServiceConfiguration class 143 Designing business logic in a microservice architecture 146 5 5.1 Business logic organization patterns 147 Designing business logic using the Transaction script pattern 149 Designing business logic using the Domain model pattern 150 About Domain-driven design 151 5.2 Designing a domain model using the DDD aggregate pattern 152 The problem with fuzzy boundaries 153 ■ Aggregates have explicit boundaries 154 ■ Aggregate rules 155 ■ Aggregate granularity 158 ■ Designing business logic with aggregates 159 5.3 Publishing domain events 160 Why publish change events? 160 ■ What is a domain event? 161 ■ Event enrichment 161 ■ Identifying domain events 162 ■ Generating and publishing domain events 164 Consuming domain events 167 www.EBooksWorld.ir xii CONTENTS 5.4 Kitchen Service business logic 168 The Ticket aggregate 169 5.5 Order Service business logic 173 The Order Aggregate 175 ■ The OrderService class 180 Developing business logic with event sourcing 183 6 6.1 Developing business logic using event sourcing 184 The trouble with traditional persistence 185 ■ Overview of event sourcing 186 ■ Handling concurrent updates using optimistic locking 193 ■ Event sourcing and publishing events 194 Using snapshots to improve performance 195 ■ Idempotent message processing 197 ■ Evolving domain events 198 Benefits of event sourcing 199 ■ Drawbacks of event sourcing 200 6.2 Implementing an event store 202 How the Eventuate Local event store works 203 ■ The Eventuate client framework for Java 205 6.3 Using sagas and event sourcing together 209 Implementing choreography-based sagas using event sourcing 210 Creating
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