/*
* 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.utils;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.Assert;
import org.junit.Test;
public class ReferenceCounterTest extends Assert {
class LatchRunner implements Runnable {
final CountDownLatch latch = new CountDownLatch(1);
final AtomicInteger counts = new AtomicInteger(0);
volatile Thread lastThreadUsed;
@Override
public void run() {
counts.incrementAndGet();
latch.countDown();
}
}
@Test
public void testReferenceNoExecutor() throws Exception {
internalTestReferenceNoExecutor(null);
}
@Test
public void testReferenceWithExecutor() throws Exception {
ExecutorService executor = Executors.newSingleThreadExecutor(ActiveMQThreadFactory.defaultThreadFactory());
internalTestReferenceNoExecutor(executor);
executor.shutdown();
}
@Test
public void testReferenceValidExecutorUsed() throws Exception {
ExecutorService executor = Executors.newSingleThreadExecutor(ActiveMQThreadFactory.defaultThreadFactory());
LatchRunner runner = new LatchRunner();
ReferenceCounterUtil counter = new ReferenceCounterUtil(runner, executor);
counter.increment();
counter.decrement();
runner.latch.await(5, TimeUnit.SECONDS);
assertNotSame(runner.lastThreadUsed, Thread.currentThread());
executor.shutdown();
}
public void internalTestReferenceNoExecutor(Executor executor) throws Exception {
LatchRunner runner = new LatchRunner();
final ReferenceCounterUtil ref;
if (executor == null) {
ref = new ReferenceCounterUtil(runner);
} else {
ref = new ReferenceCounterUtil(runner, executor);
}
Thread[] t = new Thread[100];
for (int i = 0; i < t.length; i++) {
t[i] = new Thread() {
@Override
public void run() {
ref.increment();
}
};
t[i].start();
}
for (Thread tx : t) {
tx.join();
}
for (int i = 0; i < t.length; i++) {
t[i] = new Thread() {
@Override
public void run() {
ref.decrement();
}
};
t[i].start();
}
for (Thread tx : t) {
tx.join();
}
assertTrue(runner.latch.await(5, TimeUnit.SECONDS));
assertEquals(1, runner.counts.get());
}
}