CheckedFuturecannot properly support the chained operations that are the primary goal of
CheckedFuturealso encourages users to rethrow exceptions from one thread in another thread, producing misleading stack traces. Additionally, it has a surprising policy about which exceptions to map and which to leave untouched. Guava users who want a
CheckedFuturecan fork the classes for their own use, possibly specializing them to the particular exception type they use. We recommend that most people use
ListenableFutureand perform any exception wrapping themselves. This class is scheduled for removal from Guava in January 2019.
@Beta @CanIgnoreReturnValue @Deprecated @GwtCompatible public interface CheckedFuture<V,X extends Exception> extends ListenableFuture<V>
ListenableFuturethat includes versions of the
getmethods that can throw a checked exception. This makes it easier to create a future that executes logic which can throw an exception.
Warning: We recommend against using
CheckedFuture in new projects.
CheckedFuture is difficult to build libraries atop.
CheckedFuture ports of methods like
Futures.transformAsync(com.google.common.util.concurrent.ListenableFuture<I>, com.google.common.util.concurrent.AsyncFunction<? super I, ? extends O>, java.util.concurrent.Executor) have historically had bugs, and some of these bugs are necessary,
unavoidable consequences of the
CheckedFuture API. Additionally,
encourages users to take exceptions from one thread and rethrow them in another, producing
confusing stack traces.
A common implementation is
This interface also extends the ListenableFuture interface to allow listeners to be added.
This allows the future to be used as a normal
Future or as an asynchronous callback
mechanism as needed. This allows multiple callbacks to be registered for a particular task, and
the future will guarantee execution of all listeners when the task completes.
For a simpler alternative to CheckedFuture, consider accessing Future values with
|Modifier and Type||Method and Description|
V checkedGet() throws X extends Exception
Future.get()that will translate
ExecutionExceptioninto application-specific exceptions.
V checkedGet(long timeout, TimeUnit unit) throws TimeoutException, X extends Exception
Future.get(long, TimeUnit)that will translate
ExecutionExceptioninto application-specific exceptions. On timeout this method throws a normal
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