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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package ai.vespa.feed.client;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.stream.Collectors;
/**
* @author bjorncs
*/
class Helper {
private Helper() {}
@SafeVarargs
static List<Result> await(CompletableFuture<Result>... promises) throws MultiFeedException {
List<CompletableFuture<Result>> list = new ArrayList<>();
for (CompletableFuture<Result> p : promises) list.add(p);
return await(list);
}
static List<Result> await(List<CompletableFuture<Result>> promises) throws MultiFeedException {
try {
CompletableFuture.allOf(promises.toArray(new CompletableFuture<?>[0])).join();
return promises.stream()
.map(p -> Objects.requireNonNull(p.getNow(null)))
.collect(Collectors.toList());
} catch (CompletionException e) {
List<FeedException> exceptions = new ArrayList<>();
for (CompletableFuture<Result> promise : promises) {
if (promise.isCompletedExceptionally()) {
// Lambda is executed on this thread since the future is already completed
promise.whenComplete((__, error) -> exceptions.add((FeedException) error));
}
}
throw new MultiFeedException(exceptions);
}
}
}
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