Igor Stepanov created KAFKA-3923:
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Summary: MetricReporter interface depends on final class
KafkaMetric instead of Metric interface
Key: KAFKA-3923
URL: https://issues.apache.org/jira/browse/KAFKA-3923
Project: Kafka
Issue Type: Improvement
Components: clients
Reporter: Igor Stepanov
Hello,
I'm working on exposing Kafka's consumer/producer metrics to Spring Actuator.
To achieve this, I've implemented Kafka's MetricReporter interface to allow
injecting it into the appropriate consumer/producer. No issues with
implementation itself, fine for me.
But now I've moved to writing unit tests for this implementation and decided to
use mocked KafkaMetric instances for this. But mocking of KafkaMetric itself is
not so plain - the class is final. The logical step is to use Metric interface
for mocking, but MetricReporter accepts only KafkaMetric.
I know that technically I can use PowerMock and most probably it will work fine
in this case, but talking about Kafka itself, is it a good approach to depend
on the exact implementation when interface fulfils most of the needs?
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