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 9 Composing Data from Different Sources
Many software products have a need to provide information that is composed of data from different sources within a system. The primary consumers of such composite data structures are user interfaces, integrations with external software, and reporting functionalities. As with other query use cases, there is typically no strict requirement for strong consistency. Moreover, varying consistency delays among individual data sources can be acceptable. One key design challenge with a composition of information is to avoid unnecessary coupling between the involved system parts. Also, an employed solution should degrade gracefully when individual sources are temporarily unavailable.
The composition of ...
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