Package com.google.common.util.concurrent

Interface FutureFallback<V>

Type Parameters:

V - the result type of the provided backup Future

@Beta
public interface FutureFallback<V>

Provides a backup Future to replace an earlier failed Future. An implementation of this interface can be applied to an input Future with Futures.withFallback(com.google.common.util.concurrent.ListenableFuture<? extends V>, com.google.common.util.concurrent.FutureFallback<? extends V>).

Since:

14.0

Method Summary

Modifier and Type	Method	Description
ListenableFuture<V>	create(java.lang.Throwable t)	Returns a Future to be used in place of the Future that failed with the given exception.

Method Detail

create

ListenableFuture<V> create(java.lang.Throwable t)
                    throws java.lang.Exception

Returns a Future to be used in place of the Future that failed with the given 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 future fail. If the future's get method throws an ExecutionException, then the cause is passed to this method. Any other thrown object is passed unaltered.

Throws:

java.lang.Exception