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Microservices.io is brought to you by Chris Richardson. Experienced software architect, author of POJOs in Action and the creator of the original CloudFoundry.com. His latest startup is eventuate.io, a microservices application platform.

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Pattern: Polling publisher


You have published messages/events using the Application events pattern.


How to publish messages/events into the outbox in the database to the message broker?



Publish messages by polling the outbox in the database.


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

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