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   1 /**
   2  * Copyright (c) 2010-2022 Contributors to the openHAB project
   3  *
   4  * See the NOTICE file(s) distributed with this work for additional
   5  * information.
   6  *
   7  * This program and the accompanying materials are made available under the
   8  * terms of the Eclipse Public License 2.0 which is available at
   9  * http://www.eclipse.org/legal/epl-2.0
  10  *
  11  * SPDX-License-Identifier: EPL-2.0
  12  */
  13 package org.openhab.binding.mqtt.generic.utils;
  14
  15 import java.util.HashSet;
  16 import java.util.Set;
  17 import java.util.concurrent.CompletableFuture;
  18 import java.util.function.Supplier;
  19 import java.util.stream.Collector;
  20
  21 /**
  22  * Collector to combine a stream of CompletableFutures.
  23  *
  24  * @author Jochen Klein - Initial contribution
  25  *
  26  */
  27 public class FutureCollector {
  28
  29     public static <X> Collector<CompletableFuture<X>, Set<CompletableFuture<X>>, CompletableFuture<Void>> allOf() {
  30         return Collector.<CompletableFuture<X>, Set<CompletableFuture<X>>, CompletableFuture<Void>> of(
  31                 (Supplier<Set<CompletableFuture<X>>>) HashSet::new, Set::add, (left, right) -> {
  32                     left.addAll(right);
  33                     return left;
  34                 }, a -> {
  35                     return CompletableFuture.allOf(a.toArray(new CompletableFuture[a.size()]));
  36                 }, Collector.Characteristics.UNORDERED);
  37     }
  38 }