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   1 /**
   2  * Copyright (c) 2010-2023 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 import org.eclipse.jdt.annotation.NonNullByDefault;
  22 import org.eclipse.jdt.annotation.Nullable;
  23
  24 /**
  25  * Collector to combine a stream of CompletableFutures.
  26  *
  27  * @author Jochen Klein - Initial contribution
  28  *
  29  */
  30 @NonNullByDefault
  31 public class FutureCollector {
  32
  33     public static <X> Collector<CompletableFuture<X>, Set<CompletableFuture<X>>, CompletableFuture<@Nullable Void>> allOf() {
  34         return Collector.<CompletableFuture<X>, Set<CompletableFuture<X>>, CompletableFuture<@Nullable Void>> of(
  35                 (Supplier<Set<CompletableFuture<X>>>) HashSet::new, Set::add, (left, right) -> {
  36                     left.addAll(right);
  37                     return left;
  38                 }, a -> CompletableFuture.allOf(a.toArray(new CompletableFuture[a.size()])),
  39                 Collector.Characteristics.UNORDERED);
  40     }
  41 }