OnJava8-Examples/concurrent/QuittingCompletable.java

// concurrent/QuittingCompletable.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;
import java.util.stream.*;
import java.util.concurrent.*;
import onjava.Nap;

public class QuittingCompletable {
  public static void main(String[] args) {
    List<QuittableTask> tasks =
      IntStream.range(1, QuittingTasks.COUNT)
        .mapToObj(QuittableTask::new)
        .collect(Collectors.toList());
    List<CompletableFuture<Void>> cfutures =
      tasks.stream()
        .map(CompletableFuture::runAsync)
        .collect(Collectors.toList());
    new Nap(1);
    tasks.forEach(QuittableTask::quit);
    cfutures.forEach(CompletableFuture::join);
  }
}
/* Output:
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
26 27 28 29 30 31 32 33 34 6 35 4 38 39 40 41 42 43 44
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98
99 100 101 102 103 104 105 106 107 108 109 110 111 112
1 113 114 116 117 118 119 120 121 122 123 124 125 126
127 128 129 130 131 132 133 134 135 136 137 138 139 140
141 142 143 144 145 146 147 148 149 5 115 37 36 2 3
*/