Senior LevelLaravel
How do you implement CQRS and Event Sourcing patterns in enterprise Laravel apps?
❓ Interview Prompt: Explain Command Query Responsibility Segregation (CQRS), Event Sourcing, aggregate roots, domain event streams, and spatie/laravel-event-sourcing.
Enterprise systems with complex domain rules benefit from CQRS and Event Sourcing:
Concepts:
•
CQRS: Separates write operations (Commands) from read operations (Queries/Projections).
•
Event Sourcing: Instead of storing current state in database rows, all mutations are stored as an append-only stream of immutable Domain Events. State is projected by replaying event history!
Code Implementation Example
php
<?php
namespace AppAggregates;
use SpatieEventSourcingAggregateRootsAggregateRoot;
use AppEventsAccountOpened;
use AppEventsMoneyDeposited;
class BankAccountAggregateRoot extends AggregateRoot
{
public function openAccount(string $userId): self {
$this->recordThat(new AccountOpened($userId));
return $this;
}
}💡Event Sourced Aggregate Root recording immutable domain events.
🎯 Interview Key Takeaway
Implement CQRS and Event Sourcing to audit full state mutation history and separate read/write data models.
#CQRS#Event Sourcing#Domain-Driven Design#Senior
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