September 2026
Intermediate
481 pages
14h 45m
English
book
Message- and Event-Driven Systems with CQRS and Event Sourcing: Web and Cloud Architecture
by Alex Lawrence
Content preview from Message- and Event-Driven Systems with CQRS and Event Sourcing: Web and Cloud Architecture
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Chapter 8 Evolution of Messages and Message Streams
The different categories of messages in a message-driven system enable various communication modes and processing functionalities. Commands, queries, and responses facilitate one-to-one communication, while events are used to inform about past occurrences. On top of that, selected event categories can serve as facts in persistent streams, such as when applying Event Sourcing. Independent of its category, every message adheres to an agreed-upon type-specific structure. The description of this structure may be expressed as an externalized schema and as specialized types in the source code. While messages, their structures, and streams are often treated as static aspects, they will change over ...
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