🚀 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:
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. 💡
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