33 lines
1000 B
Java
33 lines
1000 B
Java
// lowlevel/SerialNumberChecker.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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// Test SerialNumbers implementations for thread-safety
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import java.util.concurrent.*;
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import onjava.Nap;
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public class SerialNumberChecker implements Runnable {
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private CircularSet serials = new CircularSet(1000);
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private SerialNumbers producer;
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public SerialNumberChecker(SerialNumbers producer) {
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this.producer = producer;
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}
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@Override
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public void run() {
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while(true) {
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int serial = producer.nextSerialNumber();
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if(serials.contains(serial)) {
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System.out.println("Duplicate: " + serial);
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System.exit(0);
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}
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serials.add(serial);
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}
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}
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static void test(SerialNumbers producer) {
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for(int i = 0; i < 10; i++)
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CompletableFuture.runAsync(
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new SerialNumberChecker(producer));
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new Nap(4, "No duplicates detected");
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}
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}
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