public final class CompletableFutures extends Object
CompletableFuture
.Modifier and Type | Method and Description |
---|---|
static <T> CompletableFuture<T> |
completedExceptionally(Throwable throwable)
Return an immediately exceptional completed CompletableFuture.
|
static <V> com.google.common.util.concurrent.ListenableFuture<V> |
toListenableFuture(CompletableFuture<V> completableFuture)
Converts a Java 8 CompletionStage to a Guava ListenableFuture.
|
public static <V> com.google.common.util.concurrent.ListenableFuture<V> toListenableFuture(CompletableFuture<V> completableFuture)
CompletionStages.toListenableFuture(CompletionStage)
for a related function.public static <T> CompletableFuture<T> completedExceptionally(Throwable throwable)
Inspired by Guava's Futures.immediateFailedFuture(Throwable)
.
Useful because while CompletableFuture does have a
CompletableFuture.completedFuture(Object)
static factory method
to obtain immediate non-exceptional value completion, it is missing a
static factory method like this. This is often useful, e.g. when catching
exceptions to transform into CompletableFuture to return, and saves the 3
lines to create a new instance, invoke the non-static
CompletableFuture.completeExceptionally(Throwable)
and return the
completableFuture. (It's not possible to use chained invocation style,
because completeExceptionally does not return this but a boolean, which
is useless when requiring an immediately completed CompletionStage.)
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