42 lines
1.2 KiB
Java
42 lines
1.2 KiB
Java
// lowlevel/EvenChecker.java
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// (c)2020 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://OnJava8.com for more book information.
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import java.util.*;
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import java.util.stream.*;
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import java.util.concurrent.*;
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import onjava.TimedAbort;
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public class EvenChecker implements Runnable {
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private IntGenerator generator;
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private final int id;
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public EvenChecker(IntGenerator generator, int id) {
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this.generator = generator;
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this.id = id;
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}
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@Override
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public void run() {
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while(!generator.isCanceled()) {
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int val = generator.next();
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if(val % 2 != 0) {
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System.out.println(val + " not even!");
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generator.cancel(); // Cancels all EvenCheckers
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}
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}
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}
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// Test any IntGenerator:
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public static void test(IntGenerator gp, int count) {
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List<CompletableFuture<Void>> checkers =
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IntStream.range(0, count)
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.mapToObj(i -> new EvenChecker(gp, i))
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.map(CompletableFuture::runAsync)
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.collect(Collectors.toList());
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checkers.forEach(CompletableFuture::join);
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}
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// Default value for count:
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public static void test(IntGenerator gp) {
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new TimedAbort(4, "No odd numbers discovered");
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test(gp, 10);
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}
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}
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