Backoff usage in SimpleMessageListenerContainer class

Question

I can understand that org.springframework.util.backoff exists for simple use cases and to be used in core spring modules. (vs. using spring-retry).

But my question is, why spring-amqp uses it instead of spring-retry in handleStartupFailure() of SimpleMessageListenerContainer as spring-retry is already a dependency.

Answer 1

Originally, the listener container had no mechanism to backoff, just a recoveryInterval.

When backoff was added, we didn't need the extra capabilities provided by spring-retry (exception classification, stateful retry, etc) so it seemed simpler to use the Spring utility.

What is your concern? What is not provided by the current mechanism that you need?