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Introduction to Event Sourcing and Command-Query Responsibility Segregation

The concepts of event sourcing (ES) and command-query responsibility segregation (CQRS) have been around for quite a while. They are getting more and more attention in the Java community, though they...

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Achieving Consistency in CQRS with Linear Event Store

In a recent project involving an event-sourced CQRS system, we decided to do some things that seem somewhat unusual compared to solutions mostly talked about. However, they let us achieve some nice...

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Writing an Event-Sourced CQRS Read Model

Discussions about event sourcing and CQRS seem to usually focus on the overall system architecture or various flavors of domain-driven design in CQRS context. However, the read models are often...

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Persistence in CQRS Read Models

One of the biggest benefits of CQRS is the ability to implement multiple read models. Business rules and the domain model are safe, clean and isolated over in the write model. They are not getting in...

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