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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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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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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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) {} |
80 |
} |
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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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long startTime = System.nanoTime(); |
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for (int i = 0; i < SIZE; ++i) |
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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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startTime = System.nanoTime(); |
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assertNull(q.poll(timeoutMillis(), MILLISECONDS)); |
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assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
273 |
checkEmpty(q); |
274 |
} |
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|
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/** |
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* Interrupted timed poll throws InterruptedException instead of |
278 |
* returning timeout status |
279 |
*/ |
280 |
public void testInterruptedTimedPoll() throws InterruptedException { |
281 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
282 |
final CountDownLatch aboutToWait = new CountDownLatch(1); |
283 |
Thread t = newStartedThread(new CheckedRunnable() { |
284 |
public void realRun() throws InterruptedException { |
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long startTime = System.nanoTime(); |
286 |
for (int i = 0; i < SIZE; ++i) |
287 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
288 |
aboutToWait.countDown(); |
289 |
try { |
290 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
291 |
shouldThrow(); |
292 |
} catch (InterruptedException success) {} |
293 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
294 |
}}); |
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|
296 |
aboutToWait.await(); |
297 |
waitForThreadToEnterWaitState(t); |
298 |
t.interrupt(); |
299 |
awaitTermination(t); |
300 |
checkEmpty(q); |
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} |
302 |
|
303 |
/** |
304 |
* timed poll after thread interrupted throws InterruptedException |
305 |
* instead of returning timeout status |
306 |
*/ |
307 |
public void testTimedPollAfterInterrupt() throws InterruptedException { |
308 |
final BlockingQueue<Integer> q = populatedQueue(SIZE); |
309 |
Thread t = newStartedThread(new CheckedRunnable() { |
310 |
public void realRun() throws InterruptedException { |
311 |
long startTime = System.nanoTime(); |
312 |
Thread.currentThread().interrupt(); |
313 |
for (int i = 0; i < SIZE; ++i) |
314 |
assertEquals(i, (int) q.poll(LONG_DELAY_MS, MILLISECONDS)); |
315 |
try { |
316 |
q.poll(LONG_DELAY_MS, MILLISECONDS); |
317 |
shouldThrow(); |
318 |
} catch (InterruptedException success) {} |
319 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
320 |
}}); |
321 |
|
322 |
awaitTermination(t); |
323 |
checkEmpty(q); |
324 |
} |
325 |
|
326 |
/** |
327 |
* peek returns next element, or null if empty |
328 |
*/ |
329 |
public void testPeek() throws InterruptedException { |
330 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
331 |
for (int i = 0; i < SIZE; ++i) { |
332 |
assertEquals(i, (int) q.peek()); |
333 |
assertEquals(i, (int) q.poll()); |
334 |
assertTrue(q.peek() == null || |
335 |
i != (int) q.peek()); |
336 |
} |
337 |
assertNull(q.peek()); |
338 |
checkEmpty(q); |
339 |
} |
340 |
|
341 |
/** |
342 |
* element returns next element, or throws NoSuchElementException if empty |
343 |
*/ |
344 |
public void testElement() throws InterruptedException { |
345 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
346 |
for (int i = 0; i < SIZE; ++i) { |
347 |
assertEquals(i, (int) q.element()); |
348 |
assertEquals(i, (int) q.poll()); |
349 |
} |
350 |
try { |
351 |
q.element(); |
352 |
shouldThrow(); |
353 |
} catch (NoSuchElementException success) {} |
354 |
checkEmpty(q); |
355 |
} |
356 |
|
357 |
/** |
358 |
* remove removes next element, or throws NoSuchElementException if empty |
359 |
*/ |
360 |
public void testRemove() throws InterruptedException { |
361 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
362 |
for (int i = 0; i < SIZE; ++i) { |
363 |
assertEquals(i, (int) q.remove()); |
364 |
} |
365 |
try { |
366 |
q.remove(); |
367 |
shouldThrow(); |
368 |
} catch (NoSuchElementException success) {} |
369 |
checkEmpty(q); |
370 |
} |
371 |
|
372 |
/** |
373 |
* An add following remove(x) succeeds |
374 |
*/ |
375 |
public void testRemoveElementAndAdd() throws InterruptedException { |
376 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
377 |
assertTrue(q.add(one)); |
378 |
assertTrue(q.add(two)); |
379 |
assertTrue(q.remove(one)); |
380 |
assertTrue(q.remove(two)); |
381 |
assertTrue(q.add(three)); |
382 |
assertSame(q.take(), three); |
383 |
} |
384 |
|
385 |
/** |
386 |
* contains(x) reports true when elements added but not yet removed |
387 |
*/ |
388 |
public void testContains() { |
389 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
390 |
for (int i = 0; i < SIZE; ++i) { |
391 |
assertTrue(q.contains(i)); |
392 |
assertEquals(i, (int) q.poll()); |
393 |
assertFalse(q.contains(i)); |
394 |
} |
395 |
} |
396 |
|
397 |
/** |
398 |
* clear removes all elements |
399 |
*/ |
400 |
public void testClear() throws InterruptedException { |
401 |
LinkedTransferQueue q = populatedQueue(SIZE); |
402 |
q.clear(); |
403 |
checkEmpty(q); |
404 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
405 |
q.add(one); |
406 |
assertFalse(q.isEmpty()); |
407 |
assertEquals(1, q.size()); |
408 |
assertTrue(q.contains(one)); |
409 |
q.clear(); |
410 |
checkEmpty(q); |
411 |
} |
412 |
|
413 |
/** |
414 |
* containsAll(c) is true when c contains a subset of elements |
415 |
*/ |
416 |
public void testContainsAll() { |
417 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
418 |
LinkedTransferQueue<Integer> p = new LinkedTransferQueue<Integer>(); |
419 |
for (int i = 0; i < SIZE; ++i) { |
420 |
assertTrue(q.containsAll(p)); |
421 |
assertFalse(p.containsAll(q)); |
422 |
p.add(i); |
423 |
} |
424 |
assertTrue(p.containsAll(q)); |
425 |
} |
426 |
|
427 |
/** |
428 |
* retainAll(c) retains only those elements of c and reports true |
429 |
* if changed |
430 |
*/ |
431 |
public void testRetainAll() { |
432 |
LinkedTransferQueue q = populatedQueue(SIZE); |
433 |
LinkedTransferQueue p = populatedQueue(SIZE); |
434 |
for (int i = 0; i < SIZE; ++i) { |
435 |
boolean changed = q.retainAll(p); |
436 |
if (i == 0) { |
437 |
assertFalse(changed); |
438 |
} else { |
439 |
assertTrue(changed); |
440 |
} |
441 |
assertTrue(q.containsAll(p)); |
442 |
assertEquals(SIZE - i, q.size()); |
443 |
p.remove(); |
444 |
} |
445 |
} |
446 |
|
447 |
/** |
448 |
* removeAll(c) removes only those elements of c and reports true |
449 |
* if changed |
450 |
*/ |
451 |
public void testRemoveAll() { |
452 |
for (int i = 1; i < SIZE; ++i) { |
453 |
LinkedTransferQueue q = populatedQueue(SIZE); |
454 |
LinkedTransferQueue p = populatedQueue(i); |
455 |
assertTrue(q.removeAll(p)); |
456 |
assertEquals(SIZE - i, q.size()); |
457 |
for (int j = 0; j < i; ++j) { |
458 |
assertFalse(q.contains(p.remove())); |
459 |
} |
460 |
} |
461 |
} |
462 |
|
463 |
/** |
464 |
* toArray() contains all elements in FIFO order |
465 |
*/ |
466 |
public void testToArray() { |
467 |
LinkedTransferQueue q = populatedQueue(SIZE); |
468 |
Object[] o = q.toArray(); |
469 |
for (int i = 0; i < o.length; i++) { |
470 |
assertSame(o[i], q.poll()); |
471 |
} |
472 |
} |
473 |
|
474 |
/** |
475 |
* toArray(a) contains all elements in FIFO order |
476 |
*/ |
477 |
public void testToArray2() { |
478 |
LinkedTransferQueue<Integer> q = populatedQueue(SIZE); |
479 |
Integer[] ints = new Integer[SIZE]; |
480 |
Integer[] array = q.toArray(ints); |
481 |
assertSame(ints, array); |
482 |
for (int i = 0; i < ints.length; i++) { |
483 |
assertSame(ints[i], q.poll()); |
484 |
} |
485 |
} |
486 |
|
487 |
/** |
488 |
* toArray(incompatible array type) throws ArrayStoreException |
489 |
*/ |
490 |
public void testToArray1_BadArg() { |
491 |
LinkedTransferQueue q = populatedQueue(SIZE); |
492 |
try { |
493 |
q.toArray(new String[10]); |
494 |
shouldThrow(); |
495 |
} catch (ArrayStoreException success) {} |
496 |
} |
497 |
|
498 |
/** |
499 |
* iterator iterates through all elements |
500 |
*/ |
501 |
public void testIterator() throws InterruptedException { |
502 |
LinkedTransferQueue q = populatedQueue(SIZE); |
503 |
Iterator it = q.iterator(); |
504 |
int i; |
505 |
for (i = 0; it.hasNext(); i++) |
506 |
assertTrue(q.contains(it.next())); |
507 |
assertEquals(i, SIZE); |
508 |
assertIteratorExhausted(it); |
509 |
|
510 |
it = q.iterator(); |
511 |
for (i = 0; it.hasNext(); i++) |
512 |
assertEquals(it.next(), q.take()); |
513 |
assertEquals(i, SIZE); |
514 |
assertIteratorExhausted(it); |
515 |
} |
516 |
|
517 |
/** |
518 |
* iterator of empty collection has no elements |
519 |
*/ |
520 |
public void testEmptyIterator() { |
521 |
assertIteratorExhausted(new LinkedTransferQueue().iterator()); |
522 |
} |
523 |
|
524 |
/** |
525 |
* iterator.remove() removes current element |
526 |
*/ |
527 |
public void testIteratorRemove() { |
528 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
529 |
q.add(two); |
530 |
q.add(one); |
531 |
q.add(three); |
532 |
|
533 |
Iterator it = q.iterator(); |
534 |
it.next(); |
535 |
it.remove(); |
536 |
|
537 |
it = q.iterator(); |
538 |
assertSame(it.next(), one); |
539 |
assertSame(it.next(), three); |
540 |
assertFalse(it.hasNext()); |
541 |
} |
542 |
|
543 |
/** |
544 |
* iterator ordering is FIFO |
545 |
*/ |
546 |
public void testIteratorOrdering() { |
547 |
final LinkedTransferQueue<Integer> q |
548 |
= new LinkedTransferQueue<Integer>(); |
549 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
550 |
q.add(one); |
551 |
q.add(two); |
552 |
q.add(three); |
553 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
554 |
int k = 0; |
555 |
for (Integer n : q) { |
556 |
assertEquals(++k, (int) n); |
557 |
} |
558 |
assertEquals(3, k); |
559 |
} |
560 |
|
561 |
/** |
562 |
* Modifications do not cause iterators to fail |
563 |
*/ |
564 |
public void testWeaklyConsistentIteration() { |
565 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
566 |
q.add(one); |
567 |
q.add(two); |
568 |
q.add(three); |
569 |
for (Iterator it = q.iterator(); it.hasNext();) { |
570 |
q.remove(); |
571 |
it.next(); |
572 |
} |
573 |
assertEquals(0, q.size()); |
574 |
} |
575 |
|
576 |
/** |
577 |
* toString contains toStrings of elements |
578 |
*/ |
579 |
public void testToString() { |
580 |
LinkedTransferQueue q = populatedQueue(SIZE); |
581 |
String s = q.toString(); |
582 |
for (int i = 0; i < SIZE; ++i) { |
583 |
assertTrue(s.contains(String.valueOf(i))); |
584 |
} |
585 |
} |
586 |
|
587 |
/** |
588 |
* offer transfers elements across Executor tasks |
589 |
*/ |
590 |
public void testOfferInExecutor() { |
591 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
592 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
593 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
594 |
try (PoolCleaner cleaner = cleaner(executor)) { |
595 |
|
596 |
executor.execute(new CheckedRunnable() { |
597 |
public void realRun() throws InterruptedException { |
598 |
threadsStarted.await(); |
599 |
long startTime = System.nanoTime(); |
600 |
assertTrue(q.offer(one, LONG_DELAY_MS, MILLISECONDS)); |
601 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
602 |
}}); |
603 |
|
604 |
executor.execute(new CheckedRunnable() { |
605 |
public void realRun() throws InterruptedException { |
606 |
threadsStarted.await(); |
607 |
assertSame(one, q.take()); |
608 |
checkEmpty(q); |
609 |
}}); |
610 |
} |
611 |
} |
612 |
|
613 |
/** |
614 |
* timed poll retrieves elements across Executor threads |
615 |
*/ |
616 |
public void testPollInExecutor() { |
617 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
618 |
final CheckedBarrier threadsStarted = new CheckedBarrier(2); |
619 |
final ExecutorService executor = Executors.newFixedThreadPool(2); |
620 |
try (PoolCleaner cleaner = cleaner(executor)) { |
621 |
|
622 |
executor.execute(new CheckedRunnable() { |
623 |
public void realRun() throws InterruptedException { |
624 |
assertNull(q.poll()); |
625 |
threadsStarted.await(); |
626 |
long startTime = System.nanoTime(); |
627 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
628 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
629 |
checkEmpty(q); |
630 |
}}); |
631 |
|
632 |
executor.execute(new CheckedRunnable() { |
633 |
public void realRun() throws InterruptedException { |
634 |
threadsStarted.await(); |
635 |
q.put(one); |
636 |
}}); |
637 |
} |
638 |
} |
639 |
|
640 |
/** |
641 |
* A deserialized serialized queue has same elements in same order |
642 |
*/ |
643 |
public void testSerialization() throws Exception { |
644 |
Queue x = populatedQueue(SIZE); |
645 |
Queue y = serialClone(x); |
646 |
|
647 |
assertNotSame(y, x); |
648 |
assertEquals(x.size(), y.size()); |
649 |
assertEquals(x.toString(), y.toString()); |
650 |
assertTrue(Arrays.equals(x.toArray(), y.toArray())); |
651 |
while (!x.isEmpty()) { |
652 |
assertFalse(y.isEmpty()); |
653 |
assertEquals(x.remove(), y.remove()); |
654 |
} |
655 |
assertTrue(y.isEmpty()); |
656 |
} |
657 |
|
658 |
/** |
659 |
* drainTo(c) empties queue into another collection c |
660 |
*/ |
661 |
public void testDrainTo() { |
662 |
LinkedTransferQueue q = populatedQueue(SIZE); |
663 |
ArrayList l = new ArrayList(); |
664 |
q.drainTo(l); |
665 |
assertEquals(0, q.size()); |
666 |
assertEquals(SIZE, l.size()); |
667 |
for (int i = 0; i < SIZE; ++i) { |
668 |
assertEquals(i, l.get(i)); |
669 |
} |
670 |
q.add(zero); |
671 |
q.add(one); |
672 |
assertFalse(q.isEmpty()); |
673 |
assertTrue(q.contains(zero)); |
674 |
assertTrue(q.contains(one)); |
675 |
l.clear(); |
676 |
q.drainTo(l); |
677 |
assertEquals(0, q.size()); |
678 |
assertEquals(2, l.size()); |
679 |
for (int i = 0; i < 2; ++i) { |
680 |
assertEquals(i, l.get(i)); |
681 |
} |
682 |
} |
683 |
|
684 |
/** |
685 |
* drainTo(c) empties full queue, unblocking a waiting put. |
686 |
*/ |
687 |
public void testDrainToWithActivePut() throws InterruptedException { |
688 |
final LinkedTransferQueue q = populatedQueue(SIZE); |
689 |
Thread t = newStartedThread(new CheckedRunnable() { |
690 |
public void realRun() { |
691 |
q.put(SIZE + 1); |
692 |
}}); |
693 |
ArrayList l = new ArrayList(); |
694 |
q.drainTo(l); |
695 |
assertTrue(l.size() >= SIZE); |
696 |
for (int i = 0; i < SIZE; ++i) |
697 |
assertEquals(i, l.get(i)); |
698 |
awaitTermination(t); |
699 |
assertTrue(q.size() + l.size() >= SIZE); |
700 |
} |
701 |
|
702 |
/** |
703 |
* drainTo(c, n) empties first min(n, size) elements of queue into c |
704 |
*/ |
705 |
public void testDrainToN() { |
706 |
LinkedTransferQueue q = new LinkedTransferQueue(); |
707 |
for (int i = 0; i < SIZE + 2; ++i) { |
708 |
for (int j = 0; j < SIZE; j++) { |
709 |
assertTrue(q.offer(j)); |
710 |
} |
711 |
ArrayList l = new ArrayList(); |
712 |
q.drainTo(l, i); |
713 |
int k = (i < SIZE) ? i : SIZE; |
714 |
assertEquals(k, l.size()); |
715 |
assertEquals(SIZE - k, q.size()); |
716 |
for (int j = 0; j < k; ++j) |
717 |
assertEquals(j, l.get(j)); |
718 |
do {} while (q.poll() != null); |
719 |
} |
720 |
} |
721 |
|
722 |
/** |
723 |
* timed poll() or take() increments the waiting consumer count; |
724 |
* offer(e) decrements the waiting consumer count |
725 |
*/ |
726 |
public void testWaitingConsumer() throws InterruptedException { |
727 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
728 |
assertEquals(0, q.getWaitingConsumerCount()); |
729 |
assertFalse(q.hasWaitingConsumer()); |
730 |
final CountDownLatch threadStarted = new CountDownLatch(1); |
731 |
|
732 |
Thread t = newStartedThread(new CheckedRunnable() { |
733 |
public void realRun() throws InterruptedException { |
734 |
threadStarted.countDown(); |
735 |
long startTime = System.nanoTime(); |
736 |
assertSame(one, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
737 |
assertEquals(0, q.getWaitingConsumerCount()); |
738 |
assertFalse(q.hasWaitingConsumer()); |
739 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
740 |
}}); |
741 |
|
742 |
threadStarted.await(); |
743 |
waitForThreadToEnterWaitState(t); |
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); |
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); |
783 |
assertEquals(1, q.size()); |
784 |
assertSame(five, q.poll()); |
785 |
checkEmpty(q); |
786 |
awaitTermination(t); |
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); |
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); |
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 |
long startTime = System.nanoTime(); |
908 |
assertSame(hotPotato, q.poll(LONG_DELAY_MS, MILLISECONDS)); |
909 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
910 |
checkEmpty(q); |
911 |
awaitTermination(t); |
912 |
} |
913 |
|
914 |
/** |
915 |
* If there is a consumer waiting in take, tryTransfer returns |
916 |
* true while successfully transfering object. |
917 |
*/ |
918 |
public void testTryTransfer4() throws InterruptedException { |
919 |
final Object hotPotato = new Object(); |
920 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
921 |
|
922 |
Thread t = newStartedThread(new CheckedRunnable() { |
923 |
public void realRun() { |
924 |
while (! q.hasWaitingConsumer()) |
925 |
Thread.yield(); |
926 |
assertTrue(q.hasWaitingConsumer()); |
927 |
checkEmpty(q); |
928 |
assertTrue(q.tryTransfer(hotPotato)); |
929 |
}}); |
930 |
|
931 |
assertSame(q.take(), hotPotato); |
932 |
checkEmpty(q); |
933 |
awaitTermination(t); |
934 |
} |
935 |
|
936 |
/** |
937 |
* tryTransfer blocks interruptibly if no takers |
938 |
*/ |
939 |
public void testTryTransfer5() throws InterruptedException { |
940 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
941 |
final CountDownLatch pleaseInterrupt = new CountDownLatch(1); |
942 |
assertTrue(q.isEmpty()); |
943 |
|
944 |
Thread t = newStartedThread(new CheckedRunnable() { |
945 |
public void realRun() throws InterruptedException { |
946 |
long startTime = System.nanoTime(); |
947 |
Thread.currentThread().interrupt(); |
948 |
try { |
949 |
q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
950 |
shouldThrow(); |
951 |
} catch (InterruptedException success) {} |
952 |
assertFalse(Thread.interrupted()); |
953 |
|
954 |
pleaseInterrupt.countDown(); |
955 |
try { |
956 |
q.tryTransfer(new Object(), LONG_DELAY_MS, MILLISECONDS); |
957 |
shouldThrow(); |
958 |
} catch (InterruptedException success) {} |
959 |
assertFalse(Thread.interrupted()); |
960 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
961 |
}}); |
962 |
|
963 |
await(pleaseInterrupt); |
964 |
assertThreadStaysAlive(t); |
965 |
t.interrupt(); |
966 |
awaitTermination(t); |
967 |
checkEmpty(q); |
968 |
} |
969 |
|
970 |
/** |
971 |
* tryTransfer gives up after the timeout and returns false |
972 |
*/ |
973 |
public void testTryTransfer6() throws InterruptedException { |
974 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
975 |
|
976 |
Thread t = newStartedThread(new CheckedRunnable() { |
977 |
public void realRun() throws InterruptedException { |
978 |
long startTime = System.nanoTime(); |
979 |
assertFalse(q.tryTransfer(new Object(), |
980 |
timeoutMillis(), MILLISECONDS)); |
981 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
982 |
checkEmpty(q); |
983 |
}}); |
984 |
|
985 |
awaitTermination(t); |
986 |
checkEmpty(q); |
987 |
} |
988 |
|
989 |
/** |
990 |
* tryTransfer waits for any elements previously in to be removed |
991 |
* before transfering to a poll or take |
992 |
*/ |
993 |
public void testTryTransfer7() throws InterruptedException { |
994 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
995 |
assertTrue(q.offer(four)); |
996 |
|
997 |
Thread t = newStartedThread(new CheckedRunnable() { |
998 |
public void realRun() throws InterruptedException { |
999 |
long startTime = System.nanoTime(); |
1000 |
assertTrue(q.tryTransfer(five, LONG_DELAY_MS, MILLISECONDS)); |
1001 |
assertTrue(millisElapsedSince(startTime) < LONG_DELAY_MS); |
1002 |
checkEmpty(q); |
1003 |
}}); |
1004 |
|
1005 |
while (q.size() != 2) |
1006 |
Thread.yield(); |
1007 |
assertEquals(2, q.size()); |
1008 |
assertSame(four, q.poll()); |
1009 |
assertSame(five, q.poll()); |
1010 |
checkEmpty(q); |
1011 |
awaitTermination(t); |
1012 |
} |
1013 |
|
1014 |
/** |
1015 |
* tryTransfer attempts to enqueue into the queue and fails |
1016 |
* returning false not enqueueing and the successive poll is null |
1017 |
*/ |
1018 |
public void testTryTransfer8() throws InterruptedException { |
1019 |
final LinkedTransferQueue q = new LinkedTransferQueue(); |
1020 |
assertTrue(q.offer(four)); |
1021 |
assertEquals(1, q.size()); |
1022 |
long startTime = System.nanoTime(); |
1023 |
assertFalse(q.tryTransfer(five, timeoutMillis(), MILLISECONDS)); |
1024 |
assertTrue(millisElapsedSince(startTime) >= timeoutMillis()); |
1025 |
assertEquals(1, q.size()); |
1026 |
assertSame(four, q.poll()); |
1027 |
assertNull(q.poll()); |
1028 |
checkEmpty(q); |
1029 |
} |
1030 |
|
1031 |
private LinkedTransferQueue<Integer> populatedQueue(int n) { |
1032 |
LinkedTransferQueue<Integer> q = new LinkedTransferQueue<Integer>(); |
1033 |
checkEmpty(q); |
1034 |
for (int i = 0; i < n; i++) { |
1035 |
assertEquals(i, q.size()); |
1036 |
assertTrue(q.offer(i)); |
1037 |
assertEquals(Integer.MAX_VALUE, q.remainingCapacity()); |
1038 |
} |
1039 |
assertFalse(q.isEmpty()); |
1040 |
return q; |
1041 |
} |
1042 |
|
1043 |
/** |
1044 |
* remove(null), contains(null) always return false |
1045 |
*/ |
1046 |
public void testNeverContainsNull() { |
1047 |
Collection<?>[] qs = { |
1048 |
new LinkedTransferQueue<Object>(), |
1049 |
populatedQueue(2), |
1050 |
}; |
1051 |
|
1052 |
for (Collection<?> q : qs) { |
1053 |
assertFalse(q.contains(null)); |
1054 |
assertFalse(q.remove(null)); |
1055 |
} |
1056 |
} |
1057 |
} |