| /* |
| * 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(); |
| } |
| } |
| } |