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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.util.concurrent;
import org.elasticsearch.test.ESTestCase;
import org.hamcrest.Matchers;
import org.junit.Test;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicInteger;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThan;
public class CountDownTests extends ESTestCase {
@Test
public void testConcurrent() throws InterruptedException {
final AtomicInteger count = new AtomicInteger(0);
final CountDown countDown = new CountDown(scaledRandomIntBetween(10, 1000));
Thread[] threads = new Thread[between(3, 10)];
final CountDownLatch latch = new CountDownLatch(1);
for (int i = 0; i < threads.length; i++) {
threads[i] = new Thread() {
@Override
public void run() {
try {
latch.await();
} catch (InterruptedException e) {
throw new RuntimeException();
}
while (true) {
if(frequently()) {
if (countDown.isCountedDown()) {
break;
}
}
if (countDown.countDown()) {
count.incrementAndGet();
break;
}
}
}
};
threads[i].start();
}
latch.countDown();
Thread.yield();
if (rarely()) {
if (countDown.fastForward()) {
count.incrementAndGet();
}
assertThat(countDown.isCountedDown(), equalTo(true));
assertThat(countDown.fastForward(), equalTo(false));
}
for (Thread thread : threads) {
thread.join();
}
assertThat(countDown.isCountedDown(), equalTo(true));
assertThat(count.get(), Matchers.equalTo(1));
}
@Test
public void testSingleThreaded() {
int atLeast = scaledRandomIntBetween(10, 1000);
final CountDown countDown = new CountDown(atLeast);
while(!countDown.isCountedDown()) {
atLeast--;
if (countDown.countDown()) {
assertThat(atLeast, equalTo(0));
assertThat(countDown.isCountedDown(), equalTo(true));
assertThat(countDown.fastForward(), equalTo(false));
break;
}
if (rarely()) {
assertThat(countDown.fastForward(), equalTo(true));
assertThat(countDown.isCountedDown(), equalTo(true));
assertThat(countDown.fastForward(), equalTo(false));
}
assertThat(atLeast, greaterThan(0));
}
}
}