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 6 Event Sourcing
Events are a ubiquitous concept for representing facts in software. As part of a message-driven system, they are used to inform interested components about relevant changes. Within a domain model, events describe significant occurrences and allow the integration and synchronization of different transactional boundaries. Combined with a message journal, they can evolve into persistent records of domain knowledge that would otherwise be unavailable. When applying CQRS, events are the key to ensuring a loosely coupled and reactive synchronization of a query model. Even for the user interface, they are often chosen as the medium to represent past actions. In the described scenarios, events are mostly an additional aspect ...
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