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Add CompletableFutureUtil

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Signed-off-by: HenrikJannsen <boilingfrog@gmx.com>
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HenrikJannsen 2022-12-07 11:47:51 -05:00
parent 96f7db9c80
commit f4536b6a56
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common/src/main/java/bisq/common/util/CompletableFutureUtil.java Normal file
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/*
* This file is part of Bisq.
*
* Bisq is free software: you can redistribute it and/or modify it
* under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* Bisq is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
* License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Bisq. If not, see <http://www.gnu.org/licenses/>.
*/
package bisq.common.util;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
import java.util.stream.Stream;
//todo
public class CompletableFutureUtil {
public static <T> CompletableFuture<List<T>> allOf(Collection<CompletableFuture<T>> collection) {
//noinspection unchecked
return allOf(collection.toArray(new CompletableFuture[0]));
}
public static <T> CompletableFuture<List<T>> allOf(Stream<CompletableFuture<T>> stream) {
return allOf(stream.collect(Collectors.toList()));
}
public static <T> CompletableFuture<List<T>> allOf(CompletableFuture<T>... list) {
CompletableFuture<List<T>> result = CompletableFuture.allOf(list).thenApply(v ->
Stream.of(list)
.map(future -> {
// We want to return the results in list, not the futures. Once allOf call is complete
// we know that all futures have completed (normally, exceptional or cancelled).
// For exceptional and canceled cases we throw an exception.
T res = future.join();
if (future.isCompletedExceptionally()) {
throw new RuntimeException((future.handle((r, throwable) -> throwable).join()));
}
if (future.isCancelled()) {
throw new RuntimeException("Future got canceled");
}
return res;
})
.collect(Collectors.<T>toList())
);
return result;
}
}