JavaExercises/Experiments/TestVisualVMProgram.java at master · biblelamp/JavaExercises · GitHub

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import java.util.concurrent.Executors;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.Future;

import java.util.concurrent.Callable;

import java.util.concurrent.ConcurrentMap;

import java.util.concurrent.ConcurrentHashMap;

import java.util.concurrent.ThreadLocalRandom;

// from https://urvanov.ru/2017/07/19/%D0%B4%D0%B8%D0%B0%D0%B3%D0%BD%D0%BE%D1%81%D1%82%D0%B8%D0%BA%D0%B0-java-%D0%BF%D1%80%D0%B8%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%B8%D1%8F-%D1%81-jvisualvm/

public class TestVisualVMProgram {

private static final int THREAD_COUNT = 10;

private static final int TASKS_COUNT = 10;

private static final long WORK_MINUTES = 60L;

private static class MyClass{

private byte[] bytes = new byte[100_000];

}

private static final ConcurrentMap<Integer, MyClass> concurrentMap = new ConcurrentHashMap<>();

private static class MyTask implements Callable<Boolean> {

@Override

public Boolean call() throws Exception {

long startTime = System.currentTimeMillis();

// Каждый поток работает только WORK_MINUTES минут с момента старта.

while (System.currentTimeMillis() < startTime + 1000L * 60L* WORK_MINUTES) {

try {

Thread.sleep(500L);

} catch (InterruptedException ie) {

ie.printStackTrace();

}

concurrentMap.put(

ThreadLocalRandom.current().nextInt(

Integer.MIN_VALUE, Integer.MAX_VALUE),

new MyClass());

}

return true;

}

public static void main(String[] args) throws InterruptedException {

ExecutorService executorService = Executors.newFixedThreadPool(THREAD_COUNT);

Future<Boolean>[] futures = new Future[TASKS_COUNT];

System.out.println("Scheduling threads...");

for (int n = 0; n < TASKS_COUNT; n++) {

futures[n] = executorService.submit(new MyTask());

}

System.out.println("Awaiting termination...");

executorService.awaitTermination(WORK_MINUTES * 2L, TimeUnit.MINUTES);

System.out.println("Finished.");

}

JavaExercises/Experiments/TestVisualVMProgram.java at master · biblelamp/JavaExercises · GitHub

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