Module io.helidon.faulttolerance
Package io.helidon.faulttolerance

Interface Fallback<T>

Type Parameters:
T - type of the values returned
All Superinterfaces:
FtHandlerTyped<T>
public interface Fallback<T> extends FtHandlerTyped<T>
Fallback allows the user to execute an alternative function in case the provided supplier fails.

In case you call the FtHandlerTyped.invokeMulti(java.util.function.Supplier) method, the following restriction applies:

  • In case at least one record was sent (one onNext was called), the fallback will not trigger.
You may provide fallback for both a Multi and a Single. If none is provided, the method is executed without fallback.

  • Method Details

    • builder

      static <T> Fallback.Builder<T> builder()
      A builder to customize Fallback.
      Type Parameters:
      T - type of the values returned by the failing method
      Returns:
      a new builder

    • create

      static <T> Fallback<T> create(Function<Throwable,? extends CompletionStage<T>> fallback)
      Create a fallback for a Single or CompletionStage.
      Type Parameters:
      T - type of the result
      Parameters:
      fallback - fallback supplier to obtain the alternative result
      Returns:
      a new fallback

    • createMulti

      static <T> Fallback<T> createMulti(Function<Throwable,? extends Flow.Publisher<T>> fallback)
      Create a fallback for a Multi or Flow.Publisher.
      Type Parameters:
      T - type of the result
      Parameters:
      fallback - fallback supplier to obtain the alternative result
      Returns:
      a new fallback