108 lines
3.2 KiB
Java
108 lines
3.2 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.tomcat.util.collections;
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import java.util.Queue;
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import java.util.concurrent.ConcurrentLinkedQueue;
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import org.junit.Test;
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public class TesterPerformanceSynchronizedStack {
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private static final int THREAD_COUNT = 4;
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private static final int ITERATIONS = 1000000;
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private static final SynchronizedStack<Object> STACK =
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new SynchronizedStack<>();
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private static final Queue<Object> QUEUE = new ConcurrentLinkedQueue<>();
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@Test
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public void testSynchronizedStack() throws InterruptedException {
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Thread[] threads = new Thread[THREAD_COUNT];
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for (int i = 0; i < THREAD_COUNT; i++) {
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threads[i] = new StackThread();
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}
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long start = System.currentTimeMillis();
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for (int i = 0; i < THREAD_COUNT; i++) {
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threads[i].start();
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}
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for (int i = 0; i < THREAD_COUNT; i++) {
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threads[i].join();
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}
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long end = System.currentTimeMillis();
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System.out.println("SynchronizedStack: " + (end - start) + "ms");
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}
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public static class StackThread extends Thread {
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@Override
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public void run() {
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for(int i = 0; i < ITERATIONS; i++) {
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Object obj = STACK.pop();
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if (obj == null) {
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obj = new Object();
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}
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STACK.push(obj);
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}
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super.run();
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}
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}
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@Test
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public void testConcurrentQueue() throws InterruptedException {
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Thread[] threads = new Thread[THREAD_COUNT];
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for (int i = 0; i < THREAD_COUNT; i++) {
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threads[i] = new QueueThread();
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}
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long start = System.currentTimeMillis();
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for (int i = 0; i < THREAD_COUNT; i++) {
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threads[i].start();
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}
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for (int i = 0; i < THREAD_COUNT; i++) {
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threads[i].join();
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}
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long end = System.currentTimeMillis();
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System.out.println("ConcurrentLinkedQueue: " + (end - start) + "ms");
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}
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public static class QueueThread extends Thread {
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@Override
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public void run() {
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for(int i = 0; i < ITERATIONS; i++) {
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Object obj = QUEUE.poll();
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if (obj == null) {
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obj = new Object();
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}
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QUEUE.offer(obj);
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}
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super.run();
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}
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}
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}
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