/*
* 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.tomcat.util.collections;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import org.junit.Test;
public class TesterPerformanceSynchronizedStack {
private static final int THREAD_COUNT = 4;
private static final int ITERATIONS = 1000000;
private static final SynchronizedStack<Object> STACK =
new SynchronizedStack<>();
private static final Queue<Object> QUEUE = new ConcurrentLinkedQueue<>();
@Test
public void testSynchronizedStack() throws InterruptedException {
Thread[] threads = new Thread[THREAD_COUNT];
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i] = new StackThread();
}
long start = System.currentTimeMillis();
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i].start();
}
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i].join();
}
long end = System.currentTimeMillis();
System.out.println("SynchronizedStack: " + (end - start) + "ms");
}
public static class StackThread extends Thread {
@Override
public void run() {
for(int i = 0; i < ITERATIONS; i++) {
Object obj = STACK.pop();
if (obj == null) {
obj = new Object();
}
STACK.push(obj);
}
super.run();
}
}
@Test
public void testConcurrentQueue() throws InterruptedException {
Thread[] threads = new Thread[THREAD_COUNT];
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i] = new QueueThread();
}
long start = System.currentTimeMillis();
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i].start();
}
for (int i = 0; i < THREAD_COUNT; i++) {
threads[i].join();
}
long end = System.currentTimeMillis();
System.out.println("ConcurrentLinkedQueue: " + (end - start) + "ms");
}
public static class QueueThread extends Thread {
@Override
public void run() {
for(int i = 0; i < ITERATIONS; i++) {
Object obj = QUEUE.poll();
if (obj == null) {
obj = new Object();
}
QUEUE.offer(obj);
}
super.run();
}
}
}