34 lines
1008 B
Java
34 lines
1008 B
Java
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// threads/ParallelStreamPuzzle2.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.function.*;
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import java.util.stream.*;
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import java.util.concurrent.*;
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import java.nio.file.*;
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public class ParallelStreamPuzzle2 {
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public static ConcurrentLinkedDeque<String> trace =
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new ConcurrentLinkedDeque<>();
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static class
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IntGenerator implements Supplier<Integer> {
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private int current = 0;
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public synchronized Integer get() { // (1)
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trace.add(current + ": " +
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Thread.currentThread().getName());
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return current++;
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}
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}
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public static void main(String[] args) throws Exception {
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List<Integer> x = Stream.generate(new IntGenerator())
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.limit(10)
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.parallel()
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.collect(Collectors.toList());
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System.out.println(x);
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Files.write(Paths.get("PSP2.txt"), trace);
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}
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}
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/* Output:
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*/
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