/*
* Licensed to Crate under one or more contributor license agreements.
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership. Crate licenses this file
* to you under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License. You may
* obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial
* agreement.
*/
package io.crate.concurrent;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.stream.Collectors;
public final class CompletableFutures {
private CompletableFutures() {
}
/**
* Creates a {@code CompletableFuture} which will throw the given exception on the invocations
* of get()
*/
public static <T> CompletableFuture<T> failedFuture(Throwable t) {
CompletableFuture<T> future = new CompletableFuture<>();
future.completeExceptionally(t);
return future;
}
public static <T> CompletableFuture<List<T>> allAsList(Collection<? extends CompletableFuture<? extends T>> futures) {
return CompletableFuture.allOf(futures.toArray(new CompletableFuture[0]))
.thenApply(aVoid -> futures.stream()
.map(CompletableFuture::join)
.collect(Collectors.toList()));
}
}