page_027.pdf - the Saga pattern A saga is a sequence of local transactions coordinated using asynchronous messaging \u25a0 Chapter 5 describes how to

page_027.pdf - the Saga pattern A saga is a sequence of...

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the Saga pattern. A saga is a sequence of local transactions coordinated using asynchronous messaging. Chapter 5 describes how to design the business logic for a service using the domain-driven design (DDD) Aggregate and Domain event patterns. Chapter 6 builds on chapter 5 and explains how to develop business logic using the Event sourcing pattern, an event-centric way to structure the business logic and persist domain objects. Chapter 7 describes how to implement queries that retrieve data scattered across multiple services by using either the API composition pattern or the Command query responsibility segregation (CQRS) pattern. Chapter 8 covers the external API patterns for handling requests from a diverse collection of external clients, such as mobile applications, browser-based Java- Script applications, and third-party applications. Chapter 9 is the first of two chapters on automated testing techniques for micro- services. It introduces important testing concepts such as the test pyramid, which

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