aplex commented on a change in pull request #3281:
URL: https://github.com/apache/gobblin/pull/3281#discussion_r646915386
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File path:
gobblin-service/src/main/java/org/apache/gobblin/service/modules/core/ControllerUserDefinedMessageHandlerFactory.java
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@@ -51,7 +51,7 @@
class ControllerUserDefinedMessageHandlerFactory implements
MessageHandlerFactory {
private boolean flowCatalogLocalCommit;
private GobblinServiceJobScheduler jobScheduler;
- private GobblinServiceFlowConfigResourceHandler resourceHandler;
+ private FlowConfigsResourceHandler resourceHandler;
Review comment:
Instead of injecting a specific implementation, we inject an interface.
GobblinServiceFlowConfigResourceHandler implements this
FlowConfigsResourceHandler.
It's generally a good practice to use interface-based dependency injection
everywhere. That will allow us to replace implementations completely, and its
more convenient to mock in unit tests.
For example, some of our classes inherit from Guava service class. And that
service class has final methods. Mockito by default cannot override final
methods, so when we try to mock such dependency, part of the calls go to the
mocked methods, while others go to real implementation, causing complicated
bugs. If the dependency is an interface, we can mock it fully.
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