Pattern: Polling publisher §
pattern transactional messaging inter-service communicationContext §
You have applied the Transactional Outbox pattern.
Problem §
How to publish messages/events into the outbox in the database to the message broker?
Forces §
Solution §
Publish messages by polling the database’s outbox table.
Examples §
- Eventuate Tram framework implements polling.
Resulting context §
This pattern has the following benefits:
- Works with any SQL database
This pattern has the following drawbacks:
- Tricky to publish events in order
- Not all NoSQL databases support this pattern
Related patterns §
- The Transactional Outbox pattern creates the need for this pattern.
- The Transaction log tailing pattern is an alternative solution
Learn more §
- My book Microservices patterns describes this pattern in a lot more detail.
- The Eventuate Tram framework implements this pattern
Premium content now available for paid subscribers at 
