org.jclouds

Interface Fallback<V>

Type Parameters:

V - the result type of the backup value

All Known Subinterfaces:

PropagateIfRetryAfter

All Known Implementing Classes:

AzureBlobFallbacks.FalseIfContainerAlreadyExists, BlobStoreFallbacks.FalseOnContainerNotFound, BlobStoreFallbacks.FalseOnKeyNotFound, BlobStoreFallbacks.NullOnContainerNotFound, BlobStoreFallbacks.NullOnKeyAlreadyExists, BlobStoreFallbacks.NullOnKeyNotFound, BlobStoreFallbacks.ThrowContainerNotFoundOn404, BlobStoreFallbacks.ThrowKeyNotFoundOn404, CloudStackFallbacks.VoidOnNotFoundOr404OrUnableToFindAccountOwner, DynECTFallbacks.FalseOn400, EC2Fallbacks.VoidOnVolumeAvailable, EmptyFloatingIPsFallback, EmptyHealthMonitorsFallback, EmptyMembersFallback, EmptyNetworksFallback, EmptyPoolsFallback, EmptyPortsFallback, EmptyQueuesFallback, EmptyRoutersFallback, EmptyRulesFallback, EmptySecurityGroupsFallback, EmptySubnetsFallback, EmptyVIPsFallback, EndpointIfAlreadyExists, Fallbacks.AbsentOn403Or404Or500, Fallbacks.EmptyFluentIterableOnNotFoundOr404, Fallbacks.EmptyIterableWithMarkerOnNotFoundOr404, Fallbacks.EmptyListOnNotFoundOr404, Fallbacks.EmptyMapOnNotFoundOr404, Fallbacks.EmptyMultimapOnNotFoundOr404, Fallbacks.EmptyPagedIterableOnNotFoundOr404, Fallbacks.EmptySetOnNotFoundOr404, Fallbacks.FalseOnNotFoundOr404, Fallbacks.FalseOnNotFoundOr422, Fallbacks.NullOnNotFoundOr404, Fallbacks.TrueOnNotFoundOr404, Fallbacks.VoidOnNotFoundOr404, FalseIfBucketAlreadyOwnedByYouOrOperationAbortedWhenBucketExists, GoogleCloudStorageFallbacks.NullOnBucketAlreadyExists, GoogleComputeEngineFallbacks.NullOn400or404, HeaderToRetryAfterException, KeystoneFallbacks.EmptyPaginatedCollectionOnNotFoundOr404, MapHttp4xxCodesToExceptions, OAuthFallbacks.AuthorizationExceptionOn4xx, S3Fallbacks.TrueOn404OrNotFoundFalseOnIllegalState, SwiftFallbacks.TrueOn404FalseOn409, TrueOn404FalseOnPathNotEmpty

@Beta
public interface Fallback<V>

Provides a backup value to replace an earlier exception.

Since:

1.6

Method Summary

Modifier and Type	Method and Description
V	createOrPropagate(Throwable t) The exception is provided so that the Fallback implementation can conditionally determine whether to propagate the exception or to attempt to recover.

Method Detail

createOrPropagate

V createOrPropagate(Throwable t)
             throws Exception

The exception is provided so that the Fallback implementation can conditionally determine whether to propagate the exception or to attempt to recover.

Parameters:

t - the exception that made the call fail.

Throws:

Exception