org.jclouds

Interface Fallback<V>

Type Parameters:

V - the result type of the backup value

All Superinterfaces:

com.google.common.util.concurrent.FutureFallback<V>

All Known Implementing Classes:

AzureBlobFallbacks.FalseIfContainerAlreadyExists, BlobStoreFallbacks.FalseOnContainerNotFound, BlobStoreFallbacks.FalseOnKeyNotFound, BlobStoreFallbacks.NullOnContainerNotFound, BlobStoreFallbacks.NullOnKeyNotFound, BlobStoreFallbacks.ThrowContainerNotFoundOn404, BlobStoreFallbacks.ThrowKeyNotFoundOn404, CloudIdentityFallbacks.EmptyPaginatedCollectionOnNotFoundOr404, CloudStackFallbacks.VoidOnNotFoundOr404OrUnableToFindAccountOwner, DynECTFallbacks.FalseOn400, EC2Fallbacks.VoidOnVolumeAvailable, 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, KeystoneFallbacks.EmptyPaginatedCollectionOnNotFoundOr404, MapHttp4xxCodesToExceptions, S3Fallbacks.TrueOn404OrNotFoundFalseOnIllegalState, SwiftFallbacks.TrueOn404FalseOn409, TerremarkVCloudFallbacks.VoidOnDeleteDefaultIp

@Beta
public interface Fallback<V>
extends com.google.common.util.concurrent.FutureFallback<V>

Provides a backup value to replace an earlier exception.

Since:

1.6

Author:

Adrian Cole

See Also:

FutureFallback

Method Summary

Methods

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.

Methods inherited from interface com.google.common.util.concurrent.FutureFallback

create

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