/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.activemq.artemis.protocol.amqp.util;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Assert;
import org.junit.Test;
public class CreditsSemaphoreTest {
final CreditsSemaphore semaphore = new CreditsSemaphore(10);
final AtomicInteger errors = new AtomicInteger(0);
final AtomicInteger acquired = new AtomicInteger(0);
final CountDownLatch waiting = new CountDownLatch(1);
Thread thread = new Thread() {
@Override
public void run() {
try {
for (int i = 0; i < 12; i++) {
if (!semaphore.tryAcquire()) {
waiting.countDown();
semaphore.acquire();
}
acquired.incrementAndGet();
}
} catch (Throwable e) {
e.printStackTrace();
errors.incrementAndGet();
}
}
};
@Test
public void testSetAndRelease() throws Exception {
thread.start();
// 5 seconds would be an eternity here
Assert.assertTrue(waiting.await(5, TimeUnit.SECONDS));
Assert.assertEquals(0, semaphore.getCredits());
long timeout = System.currentTimeMillis() + 1000;
while (!semaphore.hasQueuedThreads() && System.currentTimeMillis() < timeout) {
Thread.sleep(10);
}
Assert.assertTrue(semaphore.hasQueuedThreads());
semaphore.setCredits(2);
thread.join();
Assert.assertEquals(12, acquired.get());
Assert.assertFalse(semaphore.hasQueuedThreads());
}
@Test
public void testDownAndUp() throws Exception {
thread.start();
// 5 seconds would be an eternity here
Assert.assertTrue(waiting.await(5, TimeUnit.SECONDS));
Assert.assertEquals(0, semaphore.getCredits());
long timeout = System.currentTimeMillis() + 1000;
while (!semaphore.hasQueuedThreads() && System.currentTimeMillis() < timeout) {
Thread.sleep(10);
}
Assert.assertTrue(semaphore.hasQueuedThreads());
semaphore.release(2);
thread.join();
Assert.assertEquals(12, acquired.get());
Assert.assertFalse(semaphore.hasQueuedThreads());
}
@Test
public void testStartedZeroedSetLater() throws Exception {
semaphore.setCredits(0);
thread.start();
// 5 seconds would be an eternity here
Assert.assertTrue(waiting.await(5, TimeUnit.SECONDS));
Assert.assertEquals(0, semaphore.getCredits());
long timeout = System.currentTimeMillis() + 1000;
while (!semaphore.hasQueuedThreads() && System.currentTimeMillis() < timeout) {
Thread.sleep(10);
}
Assert.assertTrue(semaphore.hasQueuedThreads());
Assert.assertEquals(0, acquired.get());
semaphore.setCredits(12);
thread.join();
Assert.assertEquals(12, acquired.get());
Assert.assertFalse(semaphore.hasQueuedThreads());
}
}