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Abayomi Ogunnusi
Abayomi Ogunnusi

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Event Sourcing

πŸš€ Understanding Event Sourcing

Event Sourcing is a powerful design pattern used to track data changes over time by storing each state change as an event, rather than only the current state. This provides a complete history of changes, enabling easy recreation of past states for better traceability, auditing, and debugging.

Example: Order Processing in E-commerce

In e-commerce, when a customer places an order, it typically goes through multiple status changes:

Initiated -> Placed -> Shipped -> Delivered

Each status change is recorded as an event with its timestamp, allowing us to track the entire order lifecycle.

Event Sourcing Table:

Order ID Status Date
#12345 Initiated 2024-09-12 10:05 AM
#12345 Placed 2024-09-12 11:20 AM
#12345 Shipped 2024-09-13 09:00 AM
#12345 Delivered 2024-09-14 03:30 PM

Real life example:
Image description

Without Event Sourcing:

Without event sourcing, only the last status is stored, losing the full history:

Order ID Status Last Updated
#12345 Delivered 2024-09-14 03:30 PM

Event Sourcing is essential for building reliable, auditable, and scalable systems, especially when the history of changes is as important as the current state. πŸ’‘

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