| Interface | Description | 
|---|---|
| DuplicateQueryHandlerResolver | Functional interface towards resolving the occurrence of a duplicate query handler being subscribed. | 
| Class | Description | 
|---|---|
| DuplicateQueryHandlerResolution | Enumeration describing a set of reasonable  DuplicateQueryHandlerResolverimplementations. | 
| FailingDuplicateQueryHandlerResolver | Implementation of  DuplicateQueryHandlerResolverthat throws aDuplicateQueryHandlerSubscriptionExceptionwhen a duplicate registration is detected. | 
| LoggingDuplicateQueryHandlerResolver | Implementation of the  DuplicateQueryHandlerResolverthat allows registrations to be overridden by new handlers,
 but logs this (on WARN level) to a given logger. | 
| Exception | Description | 
|---|---|
| DuplicateQueryHandlerSubscriptionException | Exception indicating a duplicate Query Handler was subscribed whilst this behavior is purposefully guarded against. | 
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