48 lines
1.2 KiB
Java
48 lines
1.2 KiB
Java
// threads/CachedThreadPool3.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.stream.*;
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public class CachedThreadPool3 {
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public static Integer
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extract_result(Future<Integer> f) {
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try {
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return f.get();
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} catch(Exception e) {
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throw new RuntimeException(e);
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}
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}
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public static void main(String[] args)
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throws InterruptedException {
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ExecutorService exec =
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Executors.newCachedThreadPool();
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List<CountingTask> tasks =
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IntStream.range(0, 10)
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.mapToObj(CountingTask::new)
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.collect(Collectors.toList());
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List<Future<Integer>> futures =
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exec.invokeAll(tasks);
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Integer sum = futures.stream()
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.map(CachedThreadPool3::extract_result)
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.reduce(0, Integer::sum);
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System.out.println("sum = " + sum);
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exec.shutdown();
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}
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}
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/* Output:
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0 pool-1-thread-1 100
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6 pool-1-thread-7 100
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5 pool-1-thread-6 100
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3 pool-1-thread-4 100
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4 pool-1-thread-5 100
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2 pool-1-thread-3 100
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7 pool-1-thread-8 100
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8 pool-1-thread-9 100
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1 pool-1-thread-2 100
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9 pool-1-thread-10 100
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sum = 1000
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*/
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