795 lines
25 KiB
Java
795 lines
25 KiB
Java
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This file is available under and governed by the GNU General Public
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* License version 2 only, as published by the Free Software Foundation.
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* However, the following notice accompanied the original version of this
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* file:
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*
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* Written by Doug Lea with assistance from members of JCP JSR-166
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* Expert Group and released to the public domain, as explained at
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* http://creativecommons.org/publicdomain/zero/1.0/
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* Other contributors include Andrew Wright, Jeffrey Hayes,
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* Pat Fisher, Mike Judd.
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*/
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collection;
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import java.util.Comparator;
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import java.util.Iterator;
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import java.util.NoSuchElementException;
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import java.util.Queue;
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import java.util.concurrent.BlockingQueue;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.Executors;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.PriorityBlockingQueue;
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import java.util.concurrent.ThreadLocalRandom;
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import junit.framework.Test;
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public class PriorityBlockingQueueTest extends JSR166TestCase {
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public static class Generic extends BlockingQueueTest {
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protected BlockingQueue emptyCollection() {
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return new PriorityBlockingQueue();
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}
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}
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public static class InitialCapacity extends BlockingQueueTest {
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protected BlockingQueue emptyCollection() {
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ThreadLocalRandom rnd = ThreadLocalRandom.current();
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int initialCapacity = rnd.nextInt(1, SIZE);
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return new PriorityBlockingQueue(initialCapacity);
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}
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}
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public static void main(String[] args) {
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main(suite(), args);
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}
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public static Test suite() {
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class Implementation implements CollectionImplementation {
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public Class<?> klazz() { return PriorityBlockingQueue.class; }
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public Collection emptyCollection() {
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return new PriorityBlockingQueue();
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}
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public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
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public boolean isConcurrent() { return true; }
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public boolean permitsNulls() { return false; }
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}
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class ComparatorImplementation implements CollectionImplementation {
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public Class<?> klazz() { return PriorityBlockingQueue.class; }
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@SuppressWarnings("unchecked")
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public Collection emptyCollection() {
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ThreadLocalRandom rnd = ThreadLocalRandom.current();
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int initialCapacity = rnd.nextInt(1, 10);
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return new PriorityBlockingQueue(
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initialCapacity, new MyReverseComparator());
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}
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public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
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public boolean isConcurrent() { return true; }
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public boolean permitsNulls() { return false; }
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}
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return newTestSuite(
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PriorityBlockingQueueTest.class,
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new Generic().testSuite(),
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new InitialCapacity().testSuite(),
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CollectionTest.testSuite(new Implementation()),
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CollectionTest.testSuite(new ComparatorImplementation()));
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}
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/** Sample Comparator */
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static class MyReverseComparator implements Comparator, java.io.Serializable {
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@SuppressWarnings("unchecked")
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public int compare(Object x, Object y) {
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return ((Comparable)y).compareTo(x);
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}
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}
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/**
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* Returns a new queue of given size containing consecutive
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* Items 0 ... n - 1.
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*/
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private static PriorityBlockingQueue<Item> populatedQueue(int n) {
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(n);
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assertTrue(q.isEmpty());
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for (int i = n - 1; i >= 0; i -= 2)
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mustOffer(q, i);
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for (int i = (n & 1); i < n; i += 2)
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mustOffer(q, i);
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assertFalse(q.isEmpty());
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mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
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mustEqual(n, q.size());
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mustEqual(0, q.peek());
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return q;
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}
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/**
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* A new queue has unbounded capacity
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*/
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public void testConstructor1() {
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mustEqual(Integer.MAX_VALUE,
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new PriorityBlockingQueue<Item>(SIZE).remainingCapacity());
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}
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/**
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* Constructor throws IllegalArgumentException if capacity argument nonpositive
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*/
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public void testConstructor2() {
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try {
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new PriorityBlockingQueue<Item>(0);
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shouldThrow();
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} catch (IllegalArgumentException success) {}
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}
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/**
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* Initializing from null Collection throws NPE
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*/
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public void testConstructor3() {
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try {
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new PriorityBlockingQueue<Item>(null);
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Initializing from Collection of null elements throws NPE
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*/
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public void testConstructor4() {
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Collection<Item> elements = Arrays.asList(new Item[SIZE]);
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try {
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new PriorityBlockingQueue<Item>(elements);
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Initializing from Collection with some null elements throws NPE
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*/
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public void testConstructor5() {
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Item[] items = new Item[2]; items[0] = zero;
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Collection<Item> elements = Arrays.asList(items);
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try {
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new PriorityBlockingQueue<Item>(elements);
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Queue contains all elements of collection used to initialize
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*/
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public void testConstructor6() {
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Item[] items = defaultItems;
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(Arrays.asList(items));
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for (int i = 0; i < SIZE; ++i)
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mustEqual(items[i], q.poll());
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}
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/**
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* The comparator used in constructor is used
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*/
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public void testConstructor7() {
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MyReverseComparator cmp = new MyReverseComparator();
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@SuppressWarnings("unchecked")
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE, cmp);
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mustEqual(cmp, q.comparator());
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Item[] items = defaultItems;
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q.addAll(Arrays.asList(items));
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for (int i = SIZE - 1; i >= 0; --i)
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mustEqual(items[i], q.poll());
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}
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/**
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* isEmpty is true before add, false after
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*/
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public void testEmpty() {
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
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assertTrue(q.isEmpty());
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mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
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q.add(one);
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assertFalse(q.isEmpty());
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q.add(two);
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q.remove();
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q.remove();
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assertTrue(q.isEmpty());
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}
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/**
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* remainingCapacity() always returns Integer.MAX_VALUE
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*/
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public void testRemainingCapacity() {
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BlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
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mustEqual(SIZE - i, q.size());
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mustEqual(i, q.remove());
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}
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(Integer.MAX_VALUE, q.remainingCapacity());
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mustEqual(i, q.size());
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mustAdd(q, i);
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}
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}
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/**
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* Offer of comparable element succeeds
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*/
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public void testOffer() {
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(1);
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assertTrue(q.offer(zero));
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assertTrue(q.offer(one));
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}
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/**
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* Offer of non-Comparable throws CCE
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*/
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public void testOfferNonComparable() {
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PriorityBlockingQueue<Object> q = new PriorityBlockingQueue<>(1);
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try {
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q.offer(new Object());
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shouldThrow();
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} catch (ClassCastException success) {
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assertTrue(q.isEmpty());
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mustEqual(0, q.size());
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assertNull(q.poll());
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}
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}
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/**
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* add of comparable succeeds
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*/
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public void testAdd() {
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.size());
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mustAdd(q, i);
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}
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}
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/**
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* addAll(this) throws IllegalArgumentException
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*/
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public void testAddAllSelf() {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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try {
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q.addAll(q);
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shouldThrow();
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} catch (IllegalArgumentException success) {}
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}
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/**
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* addAll of a collection with any null elements throws NPE after
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* possibly adding some elements
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*/
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public void testAddAll3() {
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
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Item[] items = new Item[2];
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items[0] = zero;
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try {
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q.addAll(Arrays.asList(items));
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shouldThrow();
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} catch (NullPointerException success) {}
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}
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/**
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* Queue contains all elements of successful addAll
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*/
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public void testAddAll5() {
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Item[] empty = new Item[0];
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Item[] items = defaultItems;
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
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assertFalse(q.addAll(Arrays.asList(empty)));
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assertTrue(q.addAll(Arrays.asList(items)));
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for (int i = 0; i < SIZE; ++i)
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mustEqual(items[i], q.poll());
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}
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/**
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* all elements successfully put are contained
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*/
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public void testPut() {
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PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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Item x = itemFor(i);
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q.put(x);
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mustContain(q, x);
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}
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mustEqual(SIZE, q.size());
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}
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/**
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* put doesn't block waiting for take
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*/
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public void testPutWithTake() throws InterruptedException {
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final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
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final int size = 4;
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Thread t = newStartedThread(new CheckedRunnable() {
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public void realRun() {
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for (int i = 0; i < size; i++)
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q.put(zero);
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}});
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awaitTermination(t);
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mustEqual(size, q.size());
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q.take();
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}
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/**
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* Queue is unbounded, so timed offer never times out
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*/
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public void testTimedOffer() {
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final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
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Thread t = newStartedThread(new CheckedRunnable() {
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public void realRun() {
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q.put(one);
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q.put(two);
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assertTrue(q.offer(zero, SHORT_DELAY_MS, MILLISECONDS));
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assertTrue(q.offer(zero, LONG_DELAY_MS, MILLISECONDS));
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}});
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awaitTermination(t);
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}
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/**
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* take retrieves elements in priority order
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*/
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public void testTake() throws InterruptedException {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.take());
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}
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}
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/**
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* Take removes existing elements until empty, then blocks interruptibly
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*/
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public void testBlockingTake() throws InterruptedException {
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final PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
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Thread t = newStartedThread(new CheckedRunnable() {
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public void realRun() throws InterruptedException {
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for (int i = 0; i < SIZE; i++) mustEqual(i, q.take());
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Thread.currentThread().interrupt();
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try {
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q.take();
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shouldThrow();
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} catch (InterruptedException success) {}
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assertFalse(Thread.interrupted());
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pleaseInterrupt.countDown();
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try {
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q.take();
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shouldThrow();
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} catch (InterruptedException success) {}
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assertFalse(Thread.interrupted());
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}});
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await(pleaseInterrupt);
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if (randomBoolean()) assertThreadBlocks(t, Thread.State.WAITING);
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t.interrupt();
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awaitTermination(t);
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}
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/**
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* poll succeeds unless empty
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*/
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public void testPoll() {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.poll());
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}
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assertNull(q.poll());
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}
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/**
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* timed poll with zero timeout succeeds when non-empty, else times out
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*/
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public void testTimedPoll0() throws InterruptedException {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.poll(0, MILLISECONDS));
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}
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assertNull(q.poll(0, MILLISECONDS));
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}
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/**
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* timed poll with nonzero timeout succeeds when non-empty, else times out
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*/
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public void testTimedPoll() throws InterruptedException {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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long startTime = System.nanoTime();
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mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
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assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS);
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}
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long startTime = System.nanoTime();
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assertNull(q.poll(timeoutMillis(), MILLISECONDS));
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assertTrue(millisElapsedSince(startTime) >= timeoutMillis());
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checkEmpty(q);
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}
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/**
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* Interrupted timed poll throws InterruptedException instead of
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* returning timeout status
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*/
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public void testInterruptedTimedPoll() throws InterruptedException {
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final BlockingQueue<Item> q = populatedQueue(SIZE);
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final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
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Thread t = newStartedThread(new CheckedRunnable() {
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public void realRun() throws InterruptedException {
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for (int i = 0; i < SIZE; i++)
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mustEqual(i, q.poll(LONG_DELAY_MS, MILLISECONDS));
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Thread.currentThread().interrupt();
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try {
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q.poll(randomTimeout(), randomTimeUnit());
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shouldThrow();
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} catch (InterruptedException success) {}
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assertFalse(Thread.interrupted());
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pleaseInterrupt.countDown();
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try {
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q.poll(LONGER_DELAY_MS, MILLISECONDS);
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shouldThrow();
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} catch (InterruptedException success) {}
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assertFalse(Thread.interrupted());
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}});
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await(pleaseInterrupt);
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if (randomBoolean()) assertThreadBlocks(t, Thread.State.TIMED_WAITING);
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t.interrupt();
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awaitTermination(t);
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}
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/**
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* peek returns next element, or null if empty
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*/
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public void testPeek() {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.peek());
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mustEqual(i, q.poll());
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assertTrue(q.peek() == null ||
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!q.peek().equals(i));
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}
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assertNull(q.peek());
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}
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|
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/**
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* element returns next element, or throws NSEE if empty
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*/
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public void testElement() {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.element());
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mustEqual(i, q.poll());
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}
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try {
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q.element();
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shouldThrow();
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|
} catch (NoSuchElementException success) {}
|
|
}
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|
|
/**
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|
* remove removes next element, or throws NSEE if empty
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|
*/
|
|
public void testRemove() {
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PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
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for (int i = 0; i < SIZE; ++i) {
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mustEqual(i, q.remove());
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}
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try {
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|
q.remove();
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shouldThrow();
|
|
} catch (NoSuchElementException success) {}
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}
|
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|
|
/**
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|
* contains(x) reports true when elements added but not yet removed
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|
*/
|
|
public void testContains() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
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for (int i = 0; i < SIZE; ++i) {
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mustContain(q, i);
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q.poll();
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mustNotContain(q, i);
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}
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}
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|
|
/**
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|
* clear removes all elements
|
|
*/
|
|
public void testClear() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
q.clear();
|
|
assertTrue(q.isEmpty());
|
|
mustEqual(0, q.size());
|
|
q.add(one);
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assertFalse(q.isEmpty());
|
|
mustContain(q, one);
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q.clear();
|
|
assertTrue(q.isEmpty());
|
|
}
|
|
|
|
/**
|
|
* containsAll(c) is true when c contains a subset of elements
|
|
*/
|
|
public void testContainsAll() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
PriorityBlockingQueue<Item> p = new PriorityBlockingQueue<>(SIZE);
|
|
for (int i = 0; i < SIZE; ++i) {
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assertTrue(q.containsAll(p));
|
|
assertFalse(p.containsAll(q));
|
|
mustAdd(p, i);
|
|
}
|
|
assertTrue(p.containsAll(q));
|
|
}
|
|
|
|
/**
|
|
* retainAll(c) retains only those elements of c and reports true if changed
|
|
*/
|
|
public void testRetainAll() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
PriorityBlockingQueue<Item> p = populatedQueue(SIZE);
|
|
for (int i = 0; i < SIZE; ++i) {
|
|
boolean changed = q.retainAll(p);
|
|
if (i == 0)
|
|
assertFalse(changed);
|
|
else
|
|
assertTrue(changed);
|
|
|
|
assertTrue(q.containsAll(p));
|
|
mustEqual(SIZE - i, q.size());
|
|
p.remove();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* removeAll(c) removes only those elements of c and reports true if changed
|
|
*/
|
|
public void testRemoveAll() {
|
|
for (int i = 1; i < SIZE; ++i) {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
PriorityBlockingQueue<Item> p = populatedQueue(i);
|
|
assertTrue(q.removeAll(p));
|
|
mustEqual(SIZE - i, q.size());
|
|
for (int j = 0; j < i; ++j) {
|
|
Item x = p.remove();
|
|
mustNotContain(q, x);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* toArray contains all elements
|
|
*/
|
|
public void testToArray() throws InterruptedException {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
Object[] a = q.toArray();
|
|
assertSame(Object[].class, a.getClass());
|
|
Arrays.sort(a);
|
|
for (Object o : a)
|
|
assertSame(o, q.take());
|
|
assertTrue(q.isEmpty());
|
|
}
|
|
|
|
/**
|
|
* toArray(a) contains all elements
|
|
*/
|
|
public void testToArray2() throws InterruptedException {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
Item[] items = new Item[SIZE];
|
|
Item[] array = q.toArray(items);
|
|
assertSame(items, array);
|
|
Arrays.sort(items);
|
|
for (Item o : items)
|
|
assertSame(o, q.take());
|
|
assertTrue(q.isEmpty());
|
|
}
|
|
|
|
/**
|
|
* toArray(incompatible array type) throws ArrayStoreException
|
|
*/
|
|
@SuppressWarnings("CollectionToArraySafeParameter")
|
|
public void testToArray_incompatibleArrayType() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
try {
|
|
q.toArray(new String[10]);
|
|
shouldThrow();
|
|
} catch (ArrayStoreException success) {}
|
|
}
|
|
|
|
/**
|
|
* iterator iterates through all elements
|
|
*/
|
|
public void testIterator() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
Iterator<? extends Item> it = q.iterator();
|
|
int i;
|
|
for (i = 0; it.hasNext(); i++)
|
|
mustContain(q, it.next());
|
|
mustEqual(i, SIZE);
|
|
assertIteratorExhausted(it);
|
|
}
|
|
|
|
/**
|
|
* iterator of empty collection has no elements
|
|
*/
|
|
public void testEmptyIterator() {
|
|
assertIteratorExhausted(new PriorityBlockingQueue<>().iterator());
|
|
}
|
|
|
|
/**
|
|
* iterator.remove removes current element
|
|
*/
|
|
public void testIteratorRemove() {
|
|
final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(3);
|
|
q.add(two);
|
|
q.add(one);
|
|
q.add(three);
|
|
|
|
Iterator<? extends Item> it = q.iterator();
|
|
it.next();
|
|
it.remove();
|
|
|
|
it = q.iterator();
|
|
mustEqual(it.next(), two);
|
|
mustEqual(it.next(), three);
|
|
assertFalse(it.hasNext());
|
|
}
|
|
|
|
/**
|
|
* toString contains toStrings of elements
|
|
*/
|
|
public void testToString() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
String s = q.toString();
|
|
for (int i = 0; i < SIZE; ++i) {
|
|
assertTrue(s.contains(String.valueOf(i)));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* timed poll transfers elements across Executor tasks
|
|
*/
|
|
public void testPollInExecutor() {
|
|
final PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(2);
|
|
final CheckedBarrier threadsStarted = new CheckedBarrier(2);
|
|
final ExecutorService executor = Executors.newFixedThreadPool(2);
|
|
try (PoolCleaner cleaner = cleaner(executor)) {
|
|
executor.execute(new CheckedRunnable() {
|
|
public void realRun() throws InterruptedException {
|
|
assertNull(q.poll());
|
|
threadsStarted.await();
|
|
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS));
|
|
checkEmpty(q);
|
|
}});
|
|
|
|
executor.execute(new CheckedRunnable() {
|
|
public void realRun() throws InterruptedException {
|
|
threadsStarted.await();
|
|
q.put(one);
|
|
}});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A deserialized/reserialized queue has same elements
|
|
*/
|
|
public void testSerialization() throws Exception {
|
|
Queue<Item> x = populatedQueue(SIZE);
|
|
Queue<Item> y = serialClone(x);
|
|
|
|
assertNotSame(x, y);
|
|
mustEqual(x.size(), y.size());
|
|
while (!x.isEmpty()) {
|
|
assertFalse(y.isEmpty());
|
|
mustEqual(x.remove(), y.remove());
|
|
}
|
|
assertTrue(y.isEmpty());
|
|
}
|
|
|
|
/**
|
|
* drainTo(c) empties queue into another collection c
|
|
*/
|
|
public void testDrainTo() {
|
|
PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
ArrayList<Item> l = new ArrayList<>();
|
|
q.drainTo(l);
|
|
mustEqual(0, q.size());
|
|
mustEqual(SIZE, l.size());
|
|
for (int i = 0; i < SIZE; ++i)
|
|
mustEqual(l.get(i), i);
|
|
q.add(zero);
|
|
q.add(one);
|
|
assertFalse(q.isEmpty());
|
|
mustContain(q, one);
|
|
l.clear();
|
|
q.drainTo(l);
|
|
mustEqual(0, q.size());
|
|
mustEqual(2, l.size());
|
|
for (int i = 0; i < 2; ++i)
|
|
mustEqual(l.get(i), i);
|
|
}
|
|
|
|
/**
|
|
* drainTo empties queue
|
|
*/
|
|
public void testDrainToWithActivePut() throws InterruptedException {
|
|
final PriorityBlockingQueue<Item> q = populatedQueue(SIZE);
|
|
Thread t = new Thread(new CheckedRunnable() {
|
|
public void realRun() {
|
|
q.put(new Item(SIZE + 1));
|
|
}});
|
|
|
|
t.start();
|
|
ArrayList<Item> l = new ArrayList<>();
|
|
q.drainTo(l);
|
|
assertTrue(l.size() >= SIZE);
|
|
for (int i = 0; i < SIZE; ++i)
|
|
mustEqual(l.get(i), i);
|
|
t.join();
|
|
assertTrue(q.size() + l.size() >= SIZE);
|
|
}
|
|
|
|
/**
|
|
* drainTo(c, n) empties first min(n, size) elements of queue into c
|
|
*/
|
|
public void testDrainToN() {
|
|
PriorityBlockingQueue<Item> q = new PriorityBlockingQueue<>(SIZE * 2);
|
|
for (int i = 0; i < SIZE + 2; ++i) {
|
|
for (int j = 0; j < SIZE; j++)
|
|
mustOffer(q, j);
|
|
ArrayList<Item> l = new ArrayList<>();
|
|
q.drainTo(l, i);
|
|
int k = (i < SIZE) ? i : SIZE;
|
|
mustEqual(k, l.size());
|
|
mustEqual(SIZE - k, q.size());
|
|
for (int j = 0; j < k; ++j)
|
|
mustEqual(l.get(j), j);
|
|
do {} while (q.poll() != null);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* remove(null), contains(null) always return false
|
|
*/
|
|
public void testNeverContainsNull() {
|
|
Collection<?>[] qs = {
|
|
new PriorityBlockingQueue<>(),
|
|
populatedQueue(2),
|
|
};
|
|
|
|
for (Collection<?> q : qs) {
|
|
assertFalse(q.contains(null));
|
|
assertFalse(q.remove(null));
|
|
}
|
|
}
|
|
|
|
}
|