/**
* Blocks the current strand (either fiber or thread) until the given future completes, and
* returns its result.
*
* <p>Unlike {@link #get(CompletableFuture) get}, while this is a fiber-blocking operation, it is
* not suspendable. It blocks the fiber by other, less efficient means, and {@link
* #get(CompletableFuture) get} should be generally preferred over this method.
*
* @param future the future
* @return the future's result
* @throws ExecutionException if the future's computation threw an exception
* @throws InterruptedException if the current thread was interrupted while waiting
*/
public static <V> V getNoSuspend(final CompletableFuture<V> future)
throws ExecutionException, InterruptedException {
if (Fiber.isCurrentFiber() && !future.isDone()) {
try {
return new Fiber<V>() {
@Override
protected V run() throws SuspendExecution, InterruptedException {
try {
return new AsyncCompletableFuture<>(future).run();
} catch (ExecutionException e) {
throw new RuntimeExecutionException(e.getCause());
}
}
}.start().get();
} catch (ExecutionException e) {
Throwable t = e.getCause();
if (t instanceof RuntimeExecutionException) throw new ExecutionException(t.getCause());
else throw e;
}
} else return future.get();
}
/**
* Blocks the current strand (either fiber or thread) until the given future completes - but no
* longer than the given timeout - and returns its result.
*
* @param future the future
* @param timeout the maximum duration to wait for the future's result
* @param unit the timeout's time unit
* @return the future's result
* @throws ExecutionException if the future's computation threw an exception
* @throws TimeoutException if the timeout expired before the future completed
* @throws InterruptedException if the current thread was interrupted while waiting
*/
public static <V> V get(CompletableFuture<V> future, long timeout, TimeUnit unit)
throws ExecutionException, InterruptedException, SuspendExecution, TimeoutException {
if (Fiber.isCurrentFiber() && !future.isDone())
return new AsyncCompletableFuture<>(future).run(timeout, unit);
else return future.get(timeout, unit);
}
@Override
protected V requestSync() throws InterruptedException, ExecutionException {
return fut.get();
}