Axon provides a unified, productive way of developing Java applications that can evolve without significant refactoring from a monolith to Event-Driven microservices. Axon includes both a programming model as well as specialized infrastructure to provide enterprise ready operational support for the programming model - especially for scaling and distributing mission critical business applications. The programming model is provided by the popular Axon Framework while Axon Server is the infrastructure part of Axon. Both the Axon Framework and Axon Server are open source. Axon is founded upon the well-established and proven concepts of CQRS (Command Query Responsibility Segregation) and Event Sourcing.
Axon Server Enterprise in one of the two editions of Axon Server. It contains all of the features of the free Standard edition. Additionally, it contains features to make it suitable for use in mission-critical, enterprise use cases. And, as a commercial product, it comes with SLA-backed support by AxonIQ.
When doing event sourcing, we need to store events. These event are (at least conceptually) immutable and undeletable. But these events may contain personal data, and according to the GDPR privacy regulation, data subjects have a right to erasure. The AxonIQ Axon Data Protection module reconciles these seemingly contradictory requirements. It does so by enabling cryptographic erasure: Always store fields containing personal data in encrypted form, using a key that is specific to the data subject. When data about this data subject have to be erased, simply erase that key. Although the Axon Data Protection module originated from the particular challenge related to event sourcing and GDPR, it's being adopted for non-GDPR and non-erasure related use cases.
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