/*
* 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 org.junit.Assert;
import org.junit.Test;
public class TestSynchronizedQueue {
public void testPollEmpty() {
SynchronizedQueue<Object> queue = new SynchronizedQueue<>();
Assert.assertNull(queue.poll());
}
@Test
public void testOfferPollOrder() {
SynchronizedQueue<Object> queue = new SynchronizedQueue<>();
Object o1 = new Object();
Object o2 = new Object();
Object o3 = new Object();
Object o4 = new Object();
queue.offer(o1);
queue.offer(o2);
queue.offer(o3);
queue.offer(o4);
Assert.assertSame(queue.poll(), o1);
Assert.assertSame(queue.poll(), o2);
Assert.assertSame(queue.poll(), o3);
Assert.assertSame(queue.poll(), o4);
Assert.assertNull(queue.poll());
}
@Test
public void testExpandOfferPollOrder() {
SynchronizedQueue<Object> queue = new SynchronizedQueue<>();
Object o1 = new Object();
Object o2 = new Object();
Object o3 = new Object();
Object o4 = new Object();
for (int i = 0; i < 300; i++) {
queue.offer(o1);
queue.offer(o2);
queue.offer(o3);
queue.offer(o4);
}
for (int i = 0; i < 300; i++) {
Assert.assertSame(queue.poll(), o1);
Assert.assertSame(queue.poll(), o2);
Assert.assertSame(queue.poll(), o3);
Assert.assertSame(queue.poll(), o4);
}
Assert.assertNull(queue.poll());
}
@Test
public void testExpandOfferPollOrder2() {
SynchronizedQueue<Object> queue = new SynchronizedQueue<>();
Object o1 = new Object();
Object o2 = new Object();
Object o3 = new Object();
Object o4 = new Object();
for (int i = 0; i < 100; i++) {
queue.offer(o1);
queue.offer(o2);
queue.offer(o3);
queue.offer(o4);
}
for (int i = 0; i < 50; i++) {
Assert.assertSame(queue.poll(), o1);
Assert.assertSame(queue.poll(), o2);
Assert.assertSame(queue.poll(), o3);
Assert.assertSame(queue.poll(), o4);
}
for (int i = 0; i < 200; i++) {
queue.offer(o1);
queue.offer(o2);
queue.offer(o3);
queue.offer(o4);
}
for (int i = 0; i < 250; i++) {
Assert.assertSame(queue.poll(), o1);
Assert.assertSame(queue.poll(), o2);
Assert.assertSame(queue.poll(), o3);
Assert.assertSame(queue.poll(), o4);
}
Assert.assertNull(queue.poll());
}
}