/*
* 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.hadoop.hbase.util;
import java.util.concurrent.CountDownLatch;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.testclassification.MiscTests;
import org.junit.Assert;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category({MiscTests.class, MediumTests.class})
public class TestCounter {
private static final int[] THREAD_COUNTS = {1, 10, 100};
private static final int DATA_COUNT = 1000000;
private interface Operation {
void execute();
}
@Test
public void testIncrement() throws Exception {
for(int threadCount : THREAD_COUNTS) {
final Counter counter = new Counter();
execute(new Operation() {
@Override
public void execute() {
counter.increment();
}
}, threadCount);
Assert.assertEquals(threadCount * (long)DATA_COUNT, counter.get());
}
}
@Test
public void testIncrementAndGet() throws Exception {
for(int threadCount: THREAD_COUNTS) {
final Counter counter = new Counter();
execute(new Operation() {
@Override
public void execute() {
counter.increment();
counter.get();
}
}, threadCount);
Assert.assertEquals(threadCount * (long)DATA_COUNT, counter.get());
}
}
private static void execute(final Operation op, int threadCount)
throws InterruptedException {
final CountDownLatch prepareLatch = new CountDownLatch(threadCount);
final CountDownLatch startLatch = new CountDownLatch(1);
final CountDownLatch endLatch = new CountDownLatch(threadCount);
class OperationThread extends Thread {
@Override
public void run() {
try {
prepareLatch.countDown();
startLatch.await();
for(int i=0; i<DATA_COUNT; i++) {
op.execute();
}
endLatch.countDown();
} catch(Exception e) {}
}
}
for(int j=0; j<threadCount; j++) {
new OperationThread().start();
}
prepareLatch.await();
startLatch.countDown();
endLatch.await();
}
}