1 |
/* |
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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 John Vint |
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*/ |
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|
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
9 |
|
10 |
import java.util.ArrayList; |
11 |
import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.NoSuchElementException; |
16 |
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.LinkedTransferQueue; |
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|
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import junit.framework.Test; |
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|
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@SuppressWarnings({"unchecked", "rawtypes"}) |
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public class LinkedTransferQueueTest extends JSR166TestCase { |
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static class Implementation implements CollectionImplementation { |
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public Class<?> klazz() { return LinkedTransferQueue.class; } |
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public Collection emptyCollection() { return new LinkedTransferQueue(); } |
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public Object makeElement(int i) { return 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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|
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public static class Generic extends BlockingQueueTest { |
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protected BlockingQueue emptyCollection() { |
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return new LinkedTransferQueue(); |
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} |
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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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|
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public static Test suite() { |
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return newTestSuite(LinkedTransferQueueTest.class, |
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new Generic().testSuite(), |
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CollectionTest.testSuite(new Implementation())); |
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} |
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|
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/** |
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* Constructor builds new queue with size being zero and empty |
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* being true |
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*/ |
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public void testConstructor1() { |
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assertEquals(0, new LinkedTransferQueue().size()); |
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assertTrue(new LinkedTransferQueue().isEmpty()); |
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} |
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|
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/** |
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* Initializing constructor with null collection throws |
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* NullPointerException |
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*/ |
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public void testConstructor2() { |
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try { |
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new LinkedTransferQueue(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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/** |
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* Initializing from Collection of null elements throws |
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* NullPointerException |
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*/ |
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public void testConstructor3() { |
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Collection<Integer> elements = Arrays.asList(new Integer[SIZE]); |
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try { |
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new LinkedTransferQueue(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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/** |
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* Initializing constructor with a collection containing some null elements |
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* throws NullPointerException |
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*/ |
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public void testConstructor4() { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE - 1; ++i) |
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ints[i] = i; |
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Collection<Integer> elements = Arrays.asList(ints); |
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try { |
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new LinkedTransferQueue(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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/** |
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* Queue contains all elements of the collection it is initialized by |
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*/ |
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public void testConstructor5() { |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE; ++i) { |
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ints[i] = i; |
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} |
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List intList = Arrays.asList(ints); |
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LinkedTransferQueue q |
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= new LinkedTransferQueue(intList); |
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assertEquals(q.size(), intList.size()); |
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assertEquals(q.toString(), intList.toString()); |
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assertTrue(Arrays.equals(q.toArray(), |
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intList.toArray())); |
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assertTrue(Arrays.equals(q.toArray(new Object[0]), |
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intList.toArray(new Object[0]))); |
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assertTrue(Arrays.equals(q.toArray(new Object[SIZE]), |
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intList.toArray(new Object[SIZE]))); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(ints[i], q.poll()); |
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} |
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} |
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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 q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
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assertEquals(SIZE - i, q.size()); |
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assertEquals(i, q.remove()); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
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assertEquals(i, q.size()); |
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assertTrue(q.add(i)); |
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} |
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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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LinkedTransferQueue 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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/** |
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* addAll of a collection with any null elements throws |
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* NullPointerException after possibly adding some elements |
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*/ |
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public void testAddAll3() { |
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LinkedTransferQueue q = new LinkedTransferQueue(); |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE - 1; ++i) |
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ints[i] = i; |
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try { |
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q.addAll(Arrays.asList(ints)); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* Queue contains all elements, in traversal order, of successful addAll |
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*/ |
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public void testAddAll5() { |
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Integer[] empty = new Integer[0]; |
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Integer[] ints = new Integer[SIZE]; |
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for (int i = 0; i < SIZE; ++i) { |
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ints[i] = i; |
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} |
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LinkedTransferQueue q = new LinkedTransferQueue(); |
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assertFalse(q.addAll(Arrays.asList(empty))); |
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assertTrue(q.addAll(Arrays.asList(ints))); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(ints[i], q.poll()); |
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} |
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} |
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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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LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>(); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, q.size()); |
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q.put(i); |
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assertTrue(q.contains(i)); |
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} |
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} |
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|
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/** |
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* take retrieves elements in FIFO order |
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*/ |
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public void testTake() throws InterruptedException { |
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LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, (int) q.take()); |
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} |
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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 BlockingQueue 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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assertEquals(i, q.take()); |
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} |
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|
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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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|
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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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|
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await(pleaseInterrupt); |
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assertThreadStaysAlive(t); |
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t.interrupt(); |
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awaitTermination(t); |
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} |
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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() throws InterruptedException { |
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LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, (int) q.poll()); |
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} |
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assertNull(q.poll()); |
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checkEmpty(q); |
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} |
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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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LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(i, (int) q.poll(0, MILLISECONDS)); |
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} |
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assertNull(q.poll(0, MILLISECONDS)); |
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checkEmpty(q); |
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} |
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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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LinkedTransferQueue<Integer> 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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assertEquals(i, (int) 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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/** |
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* Interrupted timed poll throws InterruptedException instead of |
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* returning timeout status |
280 |
*/ |
281 |
public void testInterruptedTimedPoll() throws InterruptedException { |
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final BlockingQueue<Integer> q = populatedQueue(SIZE); |
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final CountDownLatch aboutToWait = new CountDownLatch(1); |
284 |
Thread t = newStartedThread(new CheckedRunnable() { |
285 |
public void realRun() throws InterruptedException { |
286 |
for (int i = 0; i < SIZE; ++i) { |
287 |
long t0 = System.nanoTime(); |
288 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
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assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
290 |
} |
291 |
long t0 = System.nanoTime(); |
292 |
aboutToWait.countDown(); |
293 |
try { |
294 |
q.poll(MEDIUM_DELAY_MS, MILLISECONDS); |
295 |
shouldThrow(); |
296 |
} catch (InterruptedException success) { |
297 |
assertTrue(millisElapsedSince(t0) < MEDIUM_DELAY_MS); |
298 |
} |
299 |
}}); |
300 |
|
301 |
aboutToWait.await(); |
302 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
303 |
t.interrupt(); |
304 |
awaitTermination(t, MEDIUM_DELAY_MS); |
305 |
checkEmpty(q); |
306 |
} |
307 |
|
308 |
/** |
309 |
* timed poll after thread interrupted throws InterruptedException |
310 |
* instead of returning timeout status |
311 |
*/ |
312 |
public void testTimedPollAfterInterrupt() throws InterruptedException { |
313 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
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Thread t = newStartedThread(new CheckedRunnable() { |
315 |
public void realRun() throws InterruptedException { |
316 |
Thread.currentThread().interrupt(); |
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for (int i = 0; i < SIZE; ++i) { |
318 |
long t0 = System.nanoTime(); |
319 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
320 |
assertTrue(millisElapsedSince(t0) < SMALL_DELAY_MS); |
321 |
} |
322 |
try { |
323 |
q.poll(MEDIUM_DELAY_MS, MILLISECONDS); |
324 |
shouldThrow(); |
325 |
} catch (InterruptedException success) {} |
326 |
}}); |
327 |
|
328 |
awaitTermination(t, MEDIUM_DELAY_MS); |
329 |
checkEmpty(q); |
330 |
} |
331 |
|
332 |
/** |
333 |
* peek returns next element, or null if empty |
334 |
*/ |
335 |
public void testPeek() throws InterruptedException { |
336 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
337 |
for (int i = 0; i < SIZE; ++i) { |
338 |
assertEquals(i, (int) q.peek()); |
339 |
assertEquals(i, (int) q.poll()); |
340 |
assertTrue(q.peek() == null || |
341 |
i != (int) q.peek()); |
342 |
} |
343 |
assertNull(q.peek()); |
344 |
checkEmpty(q); |
345 |
} |
346 |
|
347 |
/** |
348 |
* element returns next element, or throws NoSuchElementException if empty |
349 |
*/ |
350 |
public void testElement() throws InterruptedException { |
351 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
352 |
for (int i = 0; i < SIZE; ++i) { |
353 |
assertEquals(i, (int) q.element()); |
354 |
assertEquals(i, (int) q.poll()); |
355 |
} |
356 |
try { |
357 |
q.element(); |
358 |
shouldThrow(); |
359 |
} catch (NoSuchElementException success) {} |
360 |
checkEmpty(q); |
361 |
} |
362 |
|
363 |
/** |
364 |
* remove removes next element, or throws NoSuchElementException if empty |
365 |
*/ |
366 |
public void testRemove() throws InterruptedException { |
367 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
368 |
for (int i = 0; i < SIZE; ++i) { |
369 |
assertEquals(i, (int) q.remove()); |
370 |
} |
371 |
try { |
372 |
q.remove(); |
373 |
shouldThrow(); |
374 |
} catch (NoSuchElementException success) {} |
375 |
checkEmpty(q); |
376 |
} |
377 |
|
378 |
/** |
379 |
* An add following remove(x) succeeds |
380 |
*/ |
381 |
public void testRemoveElementAndAdd() throws InterruptedException { |
382 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
383 |
assertTrue(q.add(one)); |
384 |
assertTrue(q.add(two)); |
385 |
assertTrue(q.remove(one)); |
386 |
assertTrue(q.remove(two)); |
387 |
assertTrue(q.add(three)); |
388 |
assertSame(q.take(), three); |
389 |
} |
390 |
|
391 |
/** |
392 |
* contains(x) reports true when elements added but not yet removed |
393 |
*/ |
394 |
public void testContains() { |
395 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
396 |
for (int i = 0; i < SIZE; ++i) { |
397 |
assertTrue(q.contains(i)); |
398 |
assertEquals(i, (int) q.poll()); |
399 |
assertFalse(q.contains(i)); |
400 |
} |
401 |
} |
402 |
|
403 |
/** |
404 |
* clear removes all elements |
405 |
*/ |
406 |
public void testClear() throws InterruptedException { |
407 |
LinkedTransferQueue q = populatedQueue(SIZE); |
408 |
q.clear(); |
409 |
checkEmpty(q); |
410 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
411 |
q.add(one); |
412 |
assertFalse(q.isEmpty()); |
413 |
assertEquals(1, q.size()); |
414 |
assertTrue(q.contains(one)); |
415 |
q.clear(); |
416 |
checkEmpty(q); |
417 |
} |
418 |
|
419 |
/** |
420 |
* containsAll(c) is true when c contains a subset of elements |
421 |
*/ |
422 |
public void testContainsAll() { |
423 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
424 |
LinkedTransferQueue<Integer> p = new LinkedTransferQueue<Integer>(); |
425 |
for (int i = 0; i < SIZE; ++i) { |
426 |
assertTrue(q.containsAll(p)); |
427 |
assertFalse(p.containsAll(q)); |
428 |
p.add(i); |
429 |
} |
430 |
assertTrue(p.containsAll(q)); |
431 |
} |
432 |
|
433 |
/** |
434 |
* retainAll(c) retains only those elements of c and reports true |
435 |
* if changed |
436 |
*/ |
437 |
public void testRetainAll() { |
438 |
LinkedTransferQueue q = populatedQueue(SIZE); |
439 |
LinkedTransferQueue p = populatedQueue(SIZE); |
440 |
for (int i = 0; i < SIZE; ++i) { |
441 |
boolean changed = q.retainAll(p); |
442 |
if (i == 0) { |
443 |
assertFalse(changed); |
444 |
} else { |
445 |
assertTrue(changed); |
446 |
} |
447 |
assertTrue(q.containsAll(p)); |
448 |
assertEquals(SIZE - i, q.size()); |
449 |
p.remove(); |
450 |
} |
451 |
} |
452 |
|
453 |
/** |
454 |
* removeAll(c) removes only those elements of c and reports true |
455 |
* if changed |
456 |
*/ |
457 |
public void testRemoveAll() { |
458 |
for (int i = 1; i < SIZE; ++i) { |
459 |
LinkedTransferQueue q = populatedQueue(SIZE); |
460 |
LinkedTransferQueue p = populatedQueue(i); |
461 |
assertTrue(q.removeAll(p)); |
462 |
assertEquals(SIZE - i, q.size()); |
463 |
for (int j = 0; j < i; ++j) { |
464 |
assertFalse(q.contains(p.remove())); |
465 |
} |
466 |
} |
467 |
} |
468 |
|
469 |
/** |
470 |
* toArray() contains all elements in FIFO order |
471 |
*/ |
472 |
public void testToArray() { |
473 |
LinkedTransferQueue q = populatedQueue(SIZE); |
474 |
Object[] o = q.toArray(); |
475 |
for (int i = 0; i < o.length; i++) { |
476 |
assertSame(o[i], q.poll()); |
477 |
} |
478 |
} |
479 |
|
480 |
/** |
481 |
* toArray(a) contains all elements in FIFO order |
482 |
*/ |
483 |
public void testToArray2() { |
484 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
485 |
Integer[] ints = new Integer[SIZE]; |
486 |
Integer[] array = q.toArray(ints); |
487 |
assertSame(ints, array); |
488 |
for (int i = 0; i < ints.length; i++) { |
489 |
assertSame(ints[i], q.poll()); |
490 |
} |
491 |
} |
492 |
|
493 |
/** |
494 |
* toArray(incompatible array type) throws ArrayStoreException |
495 |
*/ |
496 |
public void testToArray1_BadArg() { |
497 |
LinkedTransferQueue q = populatedQueue(SIZE); |
498 |
try { |
499 |
q.toArray(new String[10]); |
500 |
shouldThrow(); |
501 |
} catch (ArrayStoreException success) {} |
502 |
} |
503 |
|
504 |
/** |
505 |
* iterator iterates through all elements |
506 |
*/ |
507 |
public void testIterator() throws InterruptedException { |
508 |
LinkedTransferQueue q = populatedQueue(SIZE); |
509 |
Iterator it = q.iterator(); |
510 |
int i; |
511 |
for (i = 0; it.hasNext(); i++) |
512 |
assertTrue(q.contains(it.next())); |
513 |
assertEquals(i, SIZE); |
514 |
assertIteratorExhausted(it); |
515 |
|
516 |
it = q.iterator(); |
517 |
for (i = 0; it.hasNext(); i++) |
518 |
assertEquals(it.next(), q.take()); |
519 |
assertEquals(i, SIZE); |
520 |
assertIteratorExhausted(it); |
521 |
} |
522 |
|
523 |
/** |
524 |
* iterator of empty collection has no elements |
525 |
*/ |
526 |
public void testEmptyIterator() { |
527 |
assertIteratorExhausted(new LinkedTransferQueue().iterator()); |
528 |
} |
529 |
|
530 |
/** |
531 |
* iterator.remove() removes current element |
532 |
*/ |
533 |
public void testIteratorRemove() { |
534 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
535 |
q.add(two); |
536 |
q.add(one); |
537 |
q.add(three); |
538 |
|
539 |
Iterator it = q.iterator(); |
540 |
it.next(); |
541 |
it.remove(); |
542 |
|
543 |
it = q.iterator(); |
544 |
assertSame(it.next(), one); |
545 |
assertSame(it.next(), three); |
546 |
assertFalse(it.hasNext()); |
547 |
} |
548 |
|
549 |
/** |
550 |
* iterator ordering is FIFO |
551 |
*/ |
552 |
public void testIteratorOrdering() { |
553 |
final LinkedTransferQueue<Integer> q |
554 |
= new LinkedTransferQueue<Integer>(); |
555 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
556 |
q.add(one); |
557 |
q.add(two); |
558 |
q.add(three); |
559 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
560 |
int k = 0; |
561 |
for (Integer n : q) { |
562 |
assertEquals(++k, (int) n); |
563 |
} |
564 |
assertEquals(3, k); |
565 |
} |
566 |
|
567 |
/** |
568 |
* Modifications do not cause iterators to fail |
569 |
*/ |
570 |
public void testWeaklyConsistentIteration() { |
571 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
572 |
q.add(one); |
573 |
q.add(two); |
574 |
q.add(three); |
575 |
for (Iterator it = q.iterator(); it.hasNext();) { |
576 |
q.remove(); |
577 |
it.next(); |
578 |
} |
579 |
assertEquals(0, q.size()); |
580 |
} |
581 |
|
582 |
/** |
583 |
* toString contains toStrings of elements |
584 |
*/ |
585 |
public void testToString() { |
586 |
LinkedTransferQueue q = populatedQueue(SIZE); |
587 |
String s = q.toString(); |
588 |
for (int i = 0; i < SIZE; ++i) { |
589 |
assertTrue(s.contains(String.valueOf(i))); |
590 |
} |
591 |
} |
592 |
|
593 |
/** |
594 |
* offer transfers elements across Executor tasks |
595 |
*/ |
596 |
public void testOfferInExecutor() { |
597 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
598 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
599 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
600 |
|
601 |
executor.execute(new CheckedRunnable() { |
602 |
public void realRun() throws InterruptedException { |
603 |
threadsStarted.await(); |
604 |
assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS)); |
605 |
}}); |
606 |
|
607 |
executor.execute(new CheckedRunnable() { |
608 |
public void realRun() throws InterruptedException { |
609 |
threadsStarted.await(); |
610 |
assertSame(one, q.take()); |
611 |
checkEmpty(q); |
612 |
}}); |
613 |
|
614 |
joinPool(executor); |
615 |
} |
616 |
|
617 |
/** |
618 |
* timed poll retrieves elements across Executor threads |
619 |
*/ |
620 |
public void testPollInExecutor() { |
621 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
622 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
623 |
ExecutorService executor = Executors.newFixedThreadPool(2); |
624 |
|
625 |
executor.execute(new CheckedRunnable() { |
626 |
public void realRun() throws InterruptedException { |
627 |
assertNull(q.poll()); |
628 |
threadsStarted.await(); |
629 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
630 |
checkEmpty(q); |
631 |
}}); |
632 |
|
633 |
executor.execute(new CheckedRunnable() { |
634 |
public void realRun() throws InterruptedException { |
635 |
threadsStarted.await(); |
636 |
q.put(one); |
637 |
}}); |
638 |
|
639 |
joinPool(executor); |
640 |
} |
641 |
|
642 |
/** |
643 |
* A deserialized serialized queue has same elements in same order |
644 |
*/ |
645 |
public void testSerialization() throws Exception { |
646 |
Queue x = populatedQueue(SIZE); |
647 |
Queue y = serialClone(x); |
648 |
|
649 |
assertNotSame(y, x); |
650 |
assertEquals(x.size(), y.size()); |
651 |
assertEquals(x.toString(), y.toString()); |
652 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
653 |
while (!x.isEmpty()) { |
654 |
assertFalse(y.isEmpty()); |
655 |
assertEquals(x.remove(), y.remove()); |
656 |
} |
657 |
assertTrue(y.isEmpty()); |
658 |
} |
659 |
|
660 |
/** |
661 |
* drainTo(c) empties queue into another collection c |
662 |
*/ |
663 |
public void testDrainTo() { |
664 |
LinkedTransferQueue q = populatedQueue(SIZE); |
665 |
ArrayList l = new ArrayList(); |
666 |
q.drainTo(l); |
667 |
assertEquals(0, q.size()); |
668 |
assertEquals(SIZE, l.size()); |
669 |
for (int i = 0; i < SIZE; ++i) { |
670 |
assertEquals(i, l.get(i)); |
671 |
} |
672 |
q.add(zero); |
673 |
q.add(one); |
674 |
assertFalse(q.isEmpty()); |
675 |
assertTrue(q.contains(zero)); |
676 |
assertTrue(q.contains(one)); |
677 |
l.clear(); |
678 |
q.drainTo(l); |
679 |
assertEquals(0, q.size()); |
680 |
assertEquals(2, l.size()); |
681 |
for (int i = 0; i < 2; ++i) { |
682 |
assertEquals(i, l.get(i)); |
683 |
} |
684 |
} |
685 |
|
686 |
/** |
687 |
* drainTo(c) empties full queue, unblocking a waiting put. |
688 |
*/ |
689 |
public void testDrainToWithActivePut() throws InterruptedException { |
690 |
final LinkedTransferQueue q = populatedQueue(SIZE); |
691 |
Thread t = newStartedThread(new CheckedRunnable() { |
692 |
public void realRun() { |
693 |
q.put(SIZE + 1); |
694 |
}}); |
695 |
ArrayList l = new ArrayList(); |
696 |
q.drainTo(l); |
697 |
assertTrue(l.size() >= SIZE); |
698 |
for (int i = 0; i < SIZE; ++i) |
699 |
assertEquals(i, l.get(i)); |
700 |
awaitTermination(t, MEDIUM_DELAY_MS); |
701 |
assertTrue(q.size() + l.size() >= SIZE); |
702 |
} |
703 |
|
704 |
/** |
705 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
706 |
*/ |
707 |
public void testDrainToN() { |
708 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
709 |
for (int i = 0; i < SIZE + 2; ++i) { |
710 |
for (int j = 0; j < SIZE; j++) { |
711 |
assertTrue(q.offer(j)); |
712 |
} |
713 |
ArrayList l = new ArrayList(); |
714 |
q.drainTo(l, i); |
715 |
int k = (i < SIZE) ? i : SIZE; |
716 |
assertEquals(k, l.size()); |
717 |
assertEquals(SIZE - k, q.size()); |
718 |
for (int j = 0; j < k; ++j) |
719 |
assertEquals(j, l.get(j)); |
720 |
do {} while (q.poll() != null); |
721 |
} |
722 |
} |
723 |
|
724 |
/** |
725 |
* timed poll() or take() increments the waiting consumer count; |
726 |
* offer(e) decrements the waiting consumer count |
727 |
*/ |
728 |
public void testWaitingConsumer() throws InterruptedException { |
729 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
730 |
assertEquals(0, q.getWaitingConsumerCount()); |
731 |
assertFalse(q.hasWaitingConsumer()); |
732 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
733 |
|
734 |
Thread t = newStartedThread(new CheckedRunnable() { |
735 |
public void realRun() throws InterruptedException { |
736 |
threadStarted.countDown(); |
737 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
738 |
assertEquals(0, q.getWaitingConsumerCount()); |
739 |
assertFalse(q.hasWaitingConsumer()); |
740 |
}}); |
741 |
|
742 |
threadStarted.await(); |
743 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
744 |
assertEquals(1, q.getWaitingConsumerCount()); |
745 |
assertTrue(q.hasWaitingConsumer()); |
746 |
|
747 |
assertTrue(q.offer(one)); |
748 |
assertEquals(0, q.getWaitingConsumerCount()); |
749 |
assertFalse(q.hasWaitingConsumer()); |
750 |
|
751 |
awaitTermination(t, MEDIUM_DELAY_MS); |
752 |
} |
753 |
|
754 |
/** |
755 |
* transfer(null) throws NullPointerException |
756 |
*/ |
757 |
public void testTransfer1() throws InterruptedException { |
758 |
try { |
759 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
760 |
q.transfer(null); |
761 |
shouldThrow(); |
762 |
} catch (NullPointerException success) {} |
763 |
} |
764 |
|
765 |
/** |
766 |
* transfer waits until a poll occurs. The transfered element |
767 |
* is returned by this associated poll. |
768 |
*/ |
769 |
public void testTransfer2() throws InterruptedException { |
770 |
final LinkedTransferQueue<Integer> q |
771 |
= new LinkedTransferQueue<Integer>(); |
772 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
773 |
|
774 |
Thread t = newStartedThread(new CheckedRunnable() { |
775 |
public void realRun() throws InterruptedException { |
776 |
threadStarted.countDown(); |
777 |
q.transfer(five); |
778 |
checkEmpty(q); |
779 |
}}); |
780 |
|
781 |
threadStarted.await(); |
782 |
waitForThreadToEnterWaitState(t, SMALL_DELAY_MS); |
783 |
assertEquals(1, q.size()); |
784 |
assertSame(five, q.poll()); |
785 |
checkEmpty(q); |
786 |
awaitTermination(t, MEDIUM_DELAY_MS); |
787 |
} |
788 |
|
789 |
/** |
790 |
* transfer waits until a poll occurs, and then transfers in fifo order |
791 |
*/ |
792 |
public void testTransfer3() throws InterruptedException { |
793 |
final LinkedTransferQueue<Integer> q |
794 |
= new LinkedTransferQueue<Integer>(); |
795 |
|
796 |
Thread first = newStartedThread(new CheckedRunnable() { |
797 |
public void realRun() throws InterruptedException { |
798 |
q.transfer(four); |
799 |
assertTrue(!q.contains(four)); |
800 |
assertEquals(1, q.size()); |
801 |
}}); |
802 |
|
803 |
Thread interruptedThread = newStartedThread( |
804 |
new CheckedInterruptedRunnable() { |
805 |
public void realRun() throws InterruptedException { |
806 |
while (q.isEmpty()) |
807 |
Thread.yield(); |
808 |
q.transfer(five); |
809 |
}}); |
810 |
|
811 |
while (q.size() < 2) |
812 |
Thread.yield(); |
813 |
assertEquals(2, q.size()); |
814 |
assertSame(four, q.poll()); |
815 |
first.join(); |
816 |
assertEquals(1, q.size()); |
817 |
interruptedThread.interrupt(); |
818 |
interruptedThread.join(); |
819 |
checkEmpty(q); |
820 |
} |
821 |
|
822 |
/** |
823 |
* transfer waits until a poll occurs, at which point the polling |
824 |
* thread returns the element |
825 |
*/ |
826 |
public void testTransfer4() throws InterruptedException { |
827 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
828 |
|
829 |
Thread t = newStartedThread(new CheckedRunnable() { |
830 |
public void realRun() throws InterruptedException { |
831 |
q.transfer(four); |
832 |
assertFalse(q.contains(four)); |
833 |
assertSame(three, q.poll()); |
834 |
}}); |
835 |
|
836 |
while (q.isEmpty()) |
837 |
Thread.yield(); |
838 |
assertFalse(q.isEmpty()); |
839 |
assertEquals(1, q.size()); |
840 |
assertTrue(q.offer(three)); |
841 |
assertSame(four, q.poll()); |
842 |
awaitTermination(t, MEDIUM_DELAY_MS); |
843 |
} |
844 |
|
845 |
/** |
846 |
* transfer waits until a take occurs. The transfered element |
847 |
* is returned by this associated take. |
848 |
*/ |
849 |
public void testTransfer5() throws InterruptedException { |
850 |
final LinkedTransferQueue<Integer> q |
851 |
= new LinkedTransferQueue<Integer>(); |
852 |
|
853 |
Thread t = newStartedThread(new CheckedRunnable() { |
854 |
public void realRun() throws InterruptedException { |
855 |
q.transfer(four); |
856 |
checkEmpty(q); |
857 |
}}); |
858 |
|
859 |
while (q.isEmpty()) |
860 |
Thread.yield(); |
861 |
assertFalse(q.isEmpty()); |
862 |
assertEquals(1, q.size()); |
863 |
assertSame(four, q.take()); |
864 |
checkEmpty(q); |
865 |
awaitTermination(t, MEDIUM_DELAY_MS); |
866 |
} |
867 |
|
868 |
/** |
869 |
* tryTransfer(null) throws NullPointerException |
870 |
*/ |
871 |
public void testTryTransfer1() { |
872 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
873 |
try { |
874 |
q.tryTransfer(null); |
875 |
shouldThrow(); |
876 |
} catch (NullPointerException success) {} |
877 |
} |
878 |
|
879 |
/** |
880 |
* tryTransfer returns false and does not enqueue if there are no |
881 |
* consumers waiting to poll or take. |
882 |
*/ |
883 |
public void testTryTransfer2() throws InterruptedException { |
884 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
885 |
assertFalse(q.tryTransfer(new Object())); |
886 |
assertFalse(q.hasWaitingConsumer()); |
887 |
checkEmpty(q); |
888 |
} |
889 |
|
890 |
/** |
891 |
* If there is a consumer waiting in timed poll, tryTransfer |
892 |
* returns true while successfully transfering object. |
893 |
*/ |
894 |
public void testTryTransfer3() throws InterruptedException { |
895 |
final Object hotPotato = new Object(); |
896 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
897 |
|
898 |
Thread t = newStartedThread(new CheckedRunnable() { |
899 |
public void realRun() { |
900 |
while (! q.hasWaitingConsumer()) |
901 |
Thread.yield(); |
902 |
assertTrue(q.hasWaitingConsumer()); |
903 |
checkEmpty(q); |
904 |
assertTrue(q.tryTransfer(hotPotato)); |
905 |
}}); |
906 |
|
907 |
assertSame(hotPotato, q.poll(MEDIUM_DELAY_MS, MILLISECONDS)); |
908 |
checkEmpty(q); |
909 |
awaitTermination(t, MEDIUM_DELAY_MS); |
910 |
} |
911 |
|
912 |
/** |
913 |
* If there is a consumer waiting in take, tryTransfer returns |
914 |
* true while successfully transfering object. |
915 |
*/ |
916 |
public void testTryTransfer4() throws InterruptedException { |
917 |
final Object hotPotato = new Object(); |
918 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
919 |
|
920 |
Thread t = newStartedThread(new CheckedRunnable() { |
921 |
public void realRun() { |
922 |
while (! q.hasWaitingConsumer()) |
923 |
Thread.yield(); |
924 |
assertTrue(q.hasWaitingConsumer()); |
925 |
checkEmpty(q); |
926 |
assertTrue(q.tryTransfer(hotPotato)); |
927 |
}}); |
928 |
|
929 |
assertSame(q.take(), hotPotato); |
930 |
checkEmpty(q); |
931 |
awaitTermination(t, MEDIUM_DELAY_MS); |
932 |
} |
933 |
|
934 |
/** |
935 |
* tryTransfer blocks interruptibly if no takers |
936 |
*/ |
937 |
public void testTryTransfer5() throws InterruptedException { |
938 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
939 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
940 |
assertTrue(q.isEmpty()); |
941 |
|
942 |
Thread t = newStartedThread(new CheckedRunnable() { |
943 |
public void realRun() throws InterruptedException { |
944 |
Thread.currentThread().interrupt(); |
945 |
try { |
946 |
q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
947 |
shouldThrow(); |
948 |
} catch (InterruptedException success) {} |
949 |
assertFalse(Thread.interrupted()); |
950 |
|
951 |
pleaseInterrupt.countDown(); |
952 |
try { |
953 |
q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
954 |
shouldThrow(); |
955 |
} catch (InterruptedException success) {} |
956 |
assertFalse(Thread.interrupted()); |
957 |
}}); |
958 |
|
959 |
await(pleaseInterrupt); |
960 |
assertThreadStaysAlive(t); |
961 |
t.interrupt(); |
962 |
awaitTermination(t); |
963 |
checkEmpty(q); |
964 |
} |
965 |
|
966 |
/** |
967 |
* tryTransfer gives up after the timeout and returns false |
968 |
*/ |
969 |
public void testTryTransfer6() throws InterruptedException { |
970 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
971 |
|
972 |
Thread t = newStartedThread(new CheckedRunnable() { |
973 |
public void realRun() throws InterruptedException { |
974 |
long t0 = System.nanoTime(); |
975 |
assertFalse(q.tryTransfer(new Object(), |
976 |
timeoutMillis(), MILLISECONDS)); |
977 |
assertTrue(millisElapsedSince(t0) >= timeoutMillis()); |
978 |
checkEmpty(q); |
979 |
}}); |
980 |
|
981 |
awaitTermination(t); |
982 |
checkEmpty(q); |
983 |
} |
984 |
|
985 |
/** |
986 |
* tryTransfer waits for any elements previously in to be removed |
987 |
* before transfering to a poll or take |
988 |
*/ |
989 |
public void testTryTransfer7() throws InterruptedException { |
990 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
991 |
assertTrue(q.offer(four)); |
992 |
|
993 |
Thread t = newStartedThread(new CheckedRunnable() { |
994 |
public void realRun() throws InterruptedException { |
995 |
assertTrue(q.tryTransfer(five, MEDIUM_DELAY_MS, MILLISECONDS)); |
996 |
checkEmpty(q); |
997 |
}}); |
998 |
|
999 |
while (q.size() != 2) |
1000 |
Thread.yield(); |
1001 |
assertEquals(2, q.size()); |
1002 |
assertSame(four, q.poll()); |
1003 |
assertSame(five, q.poll()); |
1004 |
checkEmpty(q); |
1005 |
awaitTermination(t, MEDIUM_DELAY_MS); |
1006 |
} |
1007 |
|
1008 |
/** |
1009 |
* tryTransfer attempts to enqueue into the queue and fails |
1010 |
* returning false not enqueueing and the successive poll is null |
1011 |
*/ |
1012 |
public void testTryTransfer8() throws InterruptedException { |
1013 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1014 |
assertTrue(q.offer(four)); |
1015 |
assertEquals(1, q.size()); |
1016 |
long t0 = System.nanoTime(); |
1017 |
assertFalse(q.tryTransfer(five, timeoutMillis(), MILLISECONDS)); |
1018 |
assertTrue(millisElapsedSince(t0) >= timeoutMillis()); |
1019 |
assertEquals(1, q.size()); |
1020 |
assertSame(four, q.poll()); |
1021 |
assertNull(q.poll()); |
1022 |
checkEmpty(q); |
1023 |
} |
1024 |
|
1025 |
private LinkedTransferQueue<Integer> populatedQueue(int n) { |
1026 |
LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>(); |
1027 |
checkEmpty(q); |
1028 |
for (int i = 0; i < n; i++) { |
1029 |
assertEquals(i, q.size()); |
1030 |
assertTrue(q.offer(i)); |
1031 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
1032 |
} |
1033 |
assertFalse(q.isEmpty()); |
1034 |
return q; |
1035 |
} |
1036 |
|
1037 |
/** |
1038 |
* remove(null), contains(null) always return false |
1039 |
*/ |
1040 |
public void testNeverContainsNull() { |
1041 |
Collection<?>[] qs = { |
1042 |
new LinkedTransferQueue<Object>(), |
1043 |
populatedQueue(2), |
1044 |
}; |
1045 |
|
1046 |
for (Collection<?> q : qs) { |
1047 |
assertFalse(q.contains(null)); |
1048 |
assertFalse(q.remove(null)); |
1049 |
} |
1050 |
} |
1051 |
} |