Event Sourcing
A pattern in software architecture where state changes are stored as a sequence of events. It’s a way to record the history of data changes in a system through events.
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Notes
Event Sourcing makes auditing and debugging a breeze.
📜 Event Sourcing is a method of persistence that stores the changes to an application state as a sequence of events. By keeping a log of all changes, it becomes possible to reconstruct past states, enabling features such as audit trails, easy data recovery, and temporal querying. This pattern is particularly useful in complex systems where understanding the history of data changes is crucial for various operations.
TakeAways
- 📌 Stores all state changes as events, allowing reconstruction of past states and enabling powerful features like auditing and recovery.
- 💡 This pattern involves storing events in an append-only store (event log) and using them to rebuild the current state.
- 🔍 Commonly used in financial systems, event sourcing ensures transparency and traceability of transactions.
Process
- ⚙️ Capture Event: Record every change as an event.
- 🛠️ Store Event: Save the event to an append-only log.
- 🏗️ Rebuild State: Use events to reconstruct the current state of the system.
Thoughts
- 🚀 Advantages: Audit trails, data recovery, temporal querying.
- 🔍 Challenges: Complexity in handling large volumes of events and ensuring consistency.
- 🛠️ Implementation: Requires a robust event log and mechanisms for state reconstruction.