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❤

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! if(this.authProvider.validate(token)) { this.service .send(session.get("user_basket")); }

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Actor Behavior Aggregate Event View Command

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Actor Behavior Aggregate Event Command

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CQRS GetBalance Query Deposite Command GetAllOperation Query Withdraw Command … … Dispatcher Read DB Dispatcher QueryHandler CommandHandler Write DB Validation Plugin Monitoring Plugin Cache Plugin … ⚠ Eventual consistency

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• What is Event Sourcing? • Capture all domain changes as a sequence of events (stream) • Every changes in the domain are represented by events • Events are immutable • Event Store will be the single point of truth • Useful for: • Auditing • Debug • Fix inconsistency • Description of the pattern by Martin Fowler: https://martinfowler.com/eaaDev/EventSourcing.html Event Sourcing

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CQRS & Event Sourcing GetBalance Query Deposite Command GetAllOperation Query Withdraw Command … … Dispatcher Read DB Dispatcher QueryHandler CommandHandler Event Store Projection Projection Aggregate State Events Behaviors

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