Java

Event Sourcing & The GDPR – Erasing your data footprint

Michiel Rook

Recently, the EU General Data Protection Regulation (GDPR) came into effect. You’ve probably heard all about it (or at least seen the absurd amount of ‘update privacy policy’ emails in your inbox). In any case, the GDPR attempts to regulate data protection for EU citizens, and is applicable to any organization that deals with EU citizens.

The GDPR has many implications for any software or organization that processes data. However, if you are considering implementing event sourcing in your application (or have already done so), there are a few provisions in the regulation that have specific implications for event sourced applications.

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Rebuilding projections in Axon Framework 3

Michiel Rook

CQRS (Command Query Responsibility Segregation) allows you to have separate models for reading and writing. Combining that pattern with Event Sourcing leads to a powerful capability: updating query (read) models, based on events. In real-time or rebuilding them from an existing collection of events. This post focuses on such projections, in applications that are built on Axon Framework.

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Using Tracking processors to replay events in Axon Framework 3

Michiel Rook

Replaying events is a crucial part in any event sourcing / cqrs application, to rebuild projections, generate new ones or seed external systems with data.

I’m a big fan of the Axon Framework. Even with its quirks and occasional (strange) bugs, it’s my go-to toolbox for my event sourcing & cqrs consulting and development work.

With the recent 3.0 release, Axon changed the way events can be replayed by introducing the Subscribing and Tracking event processors. The Subscribing processor follows the event stream in real-time, whereas the Tracking processor keeps track of events it has processed (using a token). This means that the Tracking processor can be stopped and resumed, and it will pick up processing where it left off.

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Training sessions and talks

Michiel Rook

One of the things I like most about my work is the ability to help teams improve, by sharing my experiences and knowledge in training sessions. These sessions can be conducted in the form of interactive workshops or talks.

I’m offering training sessions on DevOps, Continuous Delivery, Event Sourcing, Microservices and many other topics. Contact me if you’re interested in details or pricing!