Ian Cartwright presents some of his work (developed with Martin Fowler) on Event Patterns (recorded at JAOO), including: Event Sourcing, Event Collaboration, Parallel Model, and Retroactive Event. These patterns can be used in scenarios where a sequence of domain model changes may need to be recorded, reversed, corrected, or simply observed.
Watch Event Patterns (30 min)
Event Sourcing
- Capture all changes to an application state as a sequence of events. You can rebuild domain object state from scratch by replaying events and may allow reversing events.
Event Collaboration
- Multiple components work together by communicating with each other by sending events when their internal state changes.
Parallel Model
- Replay past events and make changes to compare different possible outcomes. For example compare different risk management strategies for the same set of Orders.
Retroactive Event
- Correct previous Events by creating a parallel model and merging, or rewinding and replying corrected events.
Have you done any work that fits these patterns on your own projects?
Watch Event Patterns (30 min)
Event Sourcing
- Capture all changes to an application state as a sequence of events. You can rebuild domain object state from scratch by replaying events and may allow reversing events.
Event Collaboration
- Multiple components work together by communicating with each other by sending events when their internal state changes.
Parallel Model
- Replay past events and make changes to compare different possible outcomes. For example compare different risk management strategies for the same set of Orders.
Retroactive Event
- Correct previous Events by creating a parallel model and merging, or rewinding and replying corrected events.
Have you done any work that fits these patterns on your own projects?