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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

Context

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

Problem

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

Forces

Solution

Publish messages by polling the outbox in the database.

Examples

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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