test/tck/ConcurrentLinkedQueueTest.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.*;
import java.util.concurrent.*;
import java.io.*;

public class ConcurrentLinkedQueueTest extends JSR166TestCase {

    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }

    public static Test suite() {
        return new TestSuite(ConcurrentLinkedQueueTest.class);
    }

    /**
     * Create a queue of given size containing consecutive
     * Integers 0 ... n.
     */
    private ConcurrentLinkedQueue populatedQueue(int n) {
        ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        assertTrue(q.isEmpty());
        for (int i = 0; i < n; ++i)
            assertTrue(q.offer(new Integer(i)));
        assertFalse(q.isEmpty());
        assertEquals(n, q.size());
        return q;
    }

    /**
     * new queue is empty
     */
    public void testConstructor1() {
        assertEquals(0, new ConcurrentLinkedQueue().size());
    }

    /**
     * Initializing from null Collection throws NPE
     */
    public void testConstructor3() {
        try {
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue((Collection)null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Initializing from Collection of null elements throws NPE
     */
    public void testConstructor4() {
        try {
            Integer[] ints = new Integer[SIZE];
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Initializing from Collection with some null elements throws NPE
     */
    public void testConstructor5() {
        try {
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE-1; ++i)
                ints[i] = new Integer(i);
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Queue contains all elements of collection used to initialize
     */
    public void testConstructor6() {
        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE; ++i)
            ints[i] = new Integer(i);
        ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
        for (int i = 0; i < SIZE; ++i)
            assertEquals(ints[i], q.poll());
    }

    /**
     * isEmpty is true before add, false after
     */
    public void testEmpty() {
        ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        assertTrue(q.isEmpty());
        q.add(one);
        assertFalse(q.isEmpty());
        q.add(two);
        q.remove();
        q.remove();
        assertTrue(q.isEmpty());
    }

    /**
     * size changes when elements added and removed
     */
    public void testSize() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(SIZE-i, q.size());
            q.remove();
        }
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.size());
            q.add(new Integer(i));
        }
    }

    /**
     * offer(null) throws NPE
     */
    public void testOfferNull() {
        try {
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
            q.offer(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * add(null) throws NPE
     */
    public void testAddNull() {
        try {
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
            q.add(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }


    /**
     * Offer returns true
     */
    public void testOffer() {
        ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        assertTrue(q.offer(zero));
        assertTrue(q.offer(one));
    }

    /**
     * add returns true
     */
    public void testAdd() {
        ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.size());
            assertTrue(q.add(new Integer(i)));
        }
    }

    /**
     * addAll(null) throws NPE
     */
    public void testAddAll1() {
        try {
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
            q.addAll(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * addAll(this) throws IAE
     */
    public void testAddAllSelf() {
        try {
            ConcurrentLinkedQueue q = populatedQueue(SIZE);
            q.addAll(q);
            shouldThrow();
        } catch (IllegalArgumentException success) {}
    }

    /**
     * addAll of a collection with null elements throws NPE
     */
    public void testAddAll2() {
        try {
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
            Integer[] ints = new Integer[SIZE];
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * addAll of a collection with any null elements throws NPE after
     * possibly adding some elements
     */
    public void testAddAll3() {
        try {
            ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE-1; ++i)
                ints[i] = new Integer(i);
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * Queue contains all elements, in traversal order, of successful addAll
     */
    public void testAddAll5() {
        Integer[] empty = new Integer[0];
        Integer[] ints = new Integer[SIZE];
        for (int i = 0; i < SIZE; ++i)
            ints[i] = new Integer(i);
        ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        assertFalse(q.addAll(Arrays.asList(empty)));
        assertTrue(q.addAll(Arrays.asList(ints)));
        for (int i = 0; i < SIZE; ++i)
            assertEquals(ints[i], q.poll());
    }

    /**
     * poll succeeds unless empty
     */
    public void testPoll() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.poll());
        }
        assertNull(q.poll());
    }

    /**
     * peek returns next element, or null if empty
     */
    public void testPeek() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.peek());
            assertEquals(i, q.poll());
            assertTrue(q.peek() == null ||
                       !q.peek().equals(i));
        }
        assertNull(q.peek());
    }

    /**
     * element returns next element, or throws NSEE if empty
     */
    public void testElement() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.element());
            assertEquals(i, q.poll());
        }
        try {
            q.element();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * remove removes next element, or throws NSEE if empty
     */
    public void testRemove() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.remove());
        }
        try {
            q.remove();
            shouldThrow();
        } catch (NoSuchElementException success) {}
    }

    /**
     * remove(x) removes x and returns true if present
     */
    public void testRemoveElement() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        for (int i = 1; i < SIZE; i+=2) {
            assertTrue(q.remove(new Integer(i)));
        }
        for (int i = 0; i < SIZE; i+=2) {
            assertTrue(q.remove(new Integer(i)));
            assertFalse(q.remove(new Integer(i+1)));
        }
        assertTrue(q.isEmpty());
    }

    /**
     * contains(x) reports true when elements added but not yet removed
     */
    public void testContains() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(q.contains(new Integer(i)));
            q.poll();
            assertFalse(q.contains(new Integer(i)));
        }
    }

    /**
     * clear removes all elements
     */
    public void testClear() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        q.clear();
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        q.add(one);
        assertFalse(q.isEmpty());
        q.clear();
        assertTrue(q.isEmpty());
    }

    /**
     * containsAll(c) is true when c contains a subset of elements
     */
    public void testContainsAll() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        ConcurrentLinkedQueue p = new ConcurrentLinkedQueue();
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(q.containsAll(p));
            assertFalse(p.containsAll(q));
            p.add(new Integer(i));
        }
        assertTrue(p.containsAll(q));
    }

    /**
     * retainAll(c) retains only those elements of c and reports true if change
     */
    public void testRetainAll() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        ConcurrentLinkedQueue p = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            boolean changed = q.retainAll(p);
            if (i == 0)
                assertFalse(changed);
            else
                assertTrue(changed);

            assertTrue(q.containsAll(p));
            assertEquals(SIZE-i, q.size());
            p.remove();
        }
    }

    /**
     * removeAll(c) removes only those elements of c and reports true if changed
     */
    public void testRemoveAll() {
        for (int i = 1; i < SIZE; ++i) {
            ConcurrentLinkedQueue q = populatedQueue(SIZE);
            ConcurrentLinkedQueue p = populatedQueue(i);
            assertTrue(q.removeAll(p));
            assertEquals(SIZE-i, q.size());
            for (int j = 0; j < i; ++j) {
                Integer I = (Integer)(p.remove());
                assertFalse(q.contains(I));
            }
        }
    }

    /**
     * toArray contains all elements
     */
    public void testToArray() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        Object[] o = q.toArray();
        Arrays.sort(o);
        for (int i = 0; i < o.length; i++)
            assertEquals(o[i], q.poll());
    }

    /**
     * toArray(a) contains all elements
     */
    public void testToArray2() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        Integer[] ints = new Integer[SIZE];
        ints = (Integer[])q.toArray(ints);
        Arrays.sort(ints);
        for (int i = 0; i < ints.length; i++)
            assertEquals(ints[i], q.poll());
    }

    /**
     * toArray(null) throws NPE
     */
    public void testToArray_BadArg() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        try {
            Object o[] = q.toArray(null);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * toArray with incompatible array type throws ArrayStoreException
     */
    public void testToArray1_BadArg() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        try {
            Object o[] = q.toArray(new String[10]);
            shouldThrow();
        } catch (ArrayStoreException success) {}
    }

    /**
     * iterator iterates through all elements
     */
    public void testIterator() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        int i = 0;
        Iterator it = q.iterator();
        while (it.hasNext()) {
            assertTrue(q.contains(it.next()));
            ++i;
        }
        assertEquals(i, SIZE);
    }

    /**
     * iterator ordering is FIFO
     */
    public void testIteratorOrdering() {
        final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        q.add(one);
        q.add(two);
        q.add(three);

        int k = 0;
        for (Iterator it = q.iterator(); it.hasNext();) {
            assertEquals(++k, it.next());
        }

        assertEquals(3, k);
    }

    /**
     * Modifications do not cause iterators to fail
     */
    public void testWeaklyConsistentIteration() {
        final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        q.add(one);
        q.add(two);
        q.add(three);

        for (Iterator it = q.iterator(); it.hasNext();) {
            q.remove();
            it.next();
        }

        assertEquals("queue should be empty again", 0, q.size());
    }

    /**
     * iterator.remove removes current element
     */
    public void testIteratorRemove() {
        final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
        q.add(one);
        q.add(two);
        q.add(three);
        Iterator it = q.iterator();
        it.next();
        it.remove();
        it = q.iterator();
        assertSame(it.next(), two);
        assertSame(it.next(), three);
        assertFalse(it.hasNext());
    }


    /**
     * toString contains toStrings of elements
     */
    public void testToString() {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        String s = q.toString();
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(s.indexOf(String.valueOf(i)) >= 0);
        }
    }

    /**
     * A deserialized serialized queue has same elements in same order
     */
    public void testSerialization() throws Exception {
        ConcurrentLinkedQueue q = populatedQueue(SIZE);
        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
        out.writeObject(q);
        out.close();

        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
        ConcurrentLinkedQueue r = (ConcurrentLinkedQueue)in.readObject();
        assertEquals(q.size(), r.size());
        while (!q.isEmpty())
            assertEquals(q.remove(), r.remove());
    }

}
Revision:	1.19
Committed:	Sat Oct 9 19:30:34 2010 UTC (13 years, 7 months ago) by jsr166
Branch:	MAIN
Changes since 1.18:	+4 -4 lines
Log Message:	whitespace
#	User	Rev	Content
1	dl	1.1	/*
2	dl	1.6	* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4			* http://creativecommons.org/licenses/publicdomain
5	jsr166	1.8	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9			import junit.framework.*;
10			import java.util.*;
11			import java.util.concurrent.*;
12	dl	1.2	import java.io.*;
13	dl	1.1
14	dl	1.3	public class ConcurrentLinkedQueueTest extends JSR166TestCase {
15	dl	1.1
16			public static void main(String[] args) {
17	jsr166	1.18	junit.textui.TestRunner.run(suite());
18	dl	1.1	}
19
20			public static Test suite() {
21	jsr166	1.12	return new TestSuite(ConcurrentLinkedQueueTest.class);
22	dl	1.1	}
23
24			/**
25			* Create a queue of given size containing consecutive
26			* Integers 0 ... n.
27			*/
28	dl	1.3	private ConcurrentLinkedQueue populatedQueue(int n) {
29	dl	1.1	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
30			assertTrue(q.isEmpty());
31	jsr166	1.12	for (int i = 0; i < n; ++i)
32			assertTrue(q.offer(new Integer(i)));
33	dl	1.1	assertFalse(q.isEmpty());
34	jsr166	1.12	assertEquals(n, q.size());
35	dl	1.1	return q;
36			}
37	jsr166	1.8
38	dl	1.4	/**
39	dl	1.5	* new queue is empty
40	dl	1.4	*/
41			public void testConstructor1() {
42	dl	1.1	assertEquals(0, new ConcurrentLinkedQueue().size());
43			}
44
45	dl	1.4	/**
46	jsr166	1.19	* Initializing from null Collection throws NPE
47	dl	1.4	*/
48	dl	1.1	public void testConstructor3() {
49			try {
50			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue((Collection)null);
51	dl	1.4	shouldThrow();
52	jsr166	1.13	} catch (NullPointerException success) {}
53	dl	1.1	}
54
55	dl	1.4	/**
56	dl	1.5	* Initializing from Collection of null elements throws NPE
57	dl	1.4	*/
58			public void testConstructor4() {
59	dl	1.1	try {
60	dl	1.3	Integer[] ints = new Integer[SIZE];
61	dl	1.1	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
62	dl	1.4	shouldThrow();
63	jsr166	1.13	} catch (NullPointerException success) {}
64	dl	1.1	}
65
66	dl	1.4	/**
67	dl	1.5	* Initializing from Collection with some null elements throws NPE
68	dl	1.4	*/
69			public void testConstructor5() {
70	dl	1.1	try {
71	dl	1.3	Integer[] ints = new Integer[SIZE];
72			for (int i = 0; i < SIZE-1; ++i)
73	dl	1.1	ints[i] = new Integer(i);
74			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
75	dl	1.4	shouldThrow();
76	jsr166	1.15	} catch (NullPointerException success) {}
77	dl	1.1	}
78
79	dl	1.4	/**
80	dl	1.5	* Queue contains all elements of collection used to initialize
81	dl	1.4	*/
82			public void testConstructor6() {
83	jsr166	1.14	Integer[] ints = new Integer[SIZE];
84			for (int i = 0; i < SIZE; ++i)
85			ints[i] = new Integer(i);
86			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
87			for (int i = 0; i < SIZE; ++i)
88			assertEquals(ints[i], q.poll());
89	dl	1.1	}
90
91	dl	1.4	/**
92	dl	1.5	* isEmpty is true before add, false after
93	dl	1.4	*/
94	dl	1.1	public void testEmpty() {
95			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
96			assertTrue(q.isEmpty());
97	dl	1.3	q.add(one);
98	dl	1.1	assertFalse(q.isEmpty());
99	dl	1.3	q.add(two);
100	dl	1.1	q.remove();
101			q.remove();
102			assertTrue(q.isEmpty());
103			}
104
105	dl	1.4	/**
106	dl	1.5	* size changes when elements added and removed
107	dl	1.4	*/
108	dl	1.1	public void testSize() {
109	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
110			for (int i = 0; i < SIZE; ++i) {
111			assertEquals(SIZE-i, q.size());
112	dl	1.1	q.remove();
113			}
114	dl	1.3	for (int i = 0; i < SIZE; ++i) {
115	dl	1.1	assertEquals(i, q.size());
116			q.add(new Integer(i));
117			}
118			}
119
120	dl	1.4	/**
121	dl	1.5	* offer(null) throws NPE
122	dl	1.4	*/
123			public void testOfferNull() {
124	jsr166	1.12	try {
125	dl	1.1	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
126			q.offer(null);
127	dl	1.4	shouldThrow();
128	jsr166	1.13	} catch (NullPointerException success) {}
129	dl	1.1	}
130
131	dl	1.4	/**
132	dl	1.5	* add(null) throws NPE
133			*/
134			public void testAddNull() {
135	jsr166	1.12	try {
136	dl	1.5	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
137			q.add(null);
138			shouldThrow();
139	jsr166	1.13	} catch (NullPointerException success) {}
140	dl	1.5	}
141
142
143			/**
144			* Offer returns true
145	dl	1.4	*/
146	dl	1.1	public void testOffer() {
147			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
148	dl	1.3	assertTrue(q.offer(zero));
149			assertTrue(q.offer(one));
150	dl	1.1	}
151
152	dl	1.4	/**
153	dl	1.5	* add returns true
154	dl	1.4	*/
155			public void testAdd() {
156	dl	1.1	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
157	dl	1.3	for (int i = 0; i < SIZE; ++i) {
158	dl	1.1	assertEquals(i, q.size());
159			assertTrue(q.add(new Integer(i)));
160			}
161			}
162
163	dl	1.4	/**
164	dl	1.5	* addAll(null) throws NPE
165	dl	1.4	*/
166			public void testAddAll1() {
167	dl	1.1	try {
168			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
169			q.addAll(null);
170	dl	1.4	shouldThrow();
171	jsr166	1.13	} catch (NullPointerException success) {}
172	dl	1.1	}
173	dl	1.5
174			/**
175			* addAll(this) throws IAE
176			*/
177			public void testAddAllSelf() {
178			try {
179			ConcurrentLinkedQueue q = populatedQueue(SIZE);
180			q.addAll(q);
181			shouldThrow();
182	jsr166	1.13	} catch (IllegalArgumentException success) {}
183	dl	1.5	}
184
185	dl	1.4	/**
186	dl	1.5	* addAll of a collection with null elements throws NPE
187	dl	1.4	*/
188			public void testAddAll2() {
189	dl	1.1	try {
190			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
191	dl	1.3	Integer[] ints = new Integer[SIZE];
192	dl	1.1	q.addAll(Arrays.asList(ints));
193	dl	1.4	shouldThrow();
194	jsr166	1.13	} catch (NullPointerException success) {}
195	dl	1.1	}
196	jsr166	1.18
197	dl	1.4	/**
198	jsr166	1.18	* addAll of a collection with any null elements throws NPE after
199	dl	1.5	* possibly adding some elements
200	dl	1.4	*/
201			public void testAddAll3() {
202	dl	1.1	try {
203			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
204	dl	1.3	Integer[] ints = new Integer[SIZE];
205			for (int i = 0; i < SIZE-1; ++i)
206	dl	1.1	ints[i] = new Integer(i);
207			q.addAll(Arrays.asList(ints));
208	dl	1.4	shouldThrow();
209	jsr166	1.13	} catch (NullPointerException success) {}
210	dl	1.1	}
211
212	dl	1.4	/**
213	dl	1.5	* Queue contains all elements, in traversal order, of successful addAll
214	dl	1.4	*/
215			public void testAddAll5() {
216	jsr166	1.14	Integer[] empty = new Integer[0];
217			Integer[] ints = new Integer[SIZE];
218			for (int i = 0; i < SIZE; ++i)
219			ints[i] = new Integer(i);
220			ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
221			assertFalse(q.addAll(Arrays.asList(empty)));
222			assertTrue(q.addAll(Arrays.asList(ints)));
223			for (int i = 0; i < SIZE; ++i)
224			assertEquals(ints[i], q.poll());
225	dl	1.1	}
226
227	dl	1.4	/**
228	dl	1.5	* poll succeeds unless empty
229	dl	1.4	*/
230			public void testPoll() {
231	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
232			for (int i = 0; i < SIZE; ++i) {
233	jsr166	1.16	assertEquals(i, q.poll());
234	dl	1.1	}
235	jsr166	1.12	assertNull(q.poll());
236	dl	1.1	}
237
238	dl	1.4	/**
239	dl	1.5	* peek returns next element, or null if empty
240	dl	1.4	*/
241			public void testPeek() {
242	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
243			for (int i = 0; i < SIZE; ++i) {
244	jsr166	1.16	assertEquals(i, q.peek());
245			assertEquals(i, q.poll());
246	dl	1.1	assertTrue(q.peek() == null \|\|
247	jsr166	1.16	!q.peek().equals(i));
248	dl	1.1	}
249	jsr166	1.12	assertNull(q.peek());
250	dl	1.1	}
251
252	dl	1.4	/**
253	dl	1.5	* element returns next element, or throws NSEE if empty
254	dl	1.4	*/
255			public void testElement() {
256	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
257			for (int i = 0; i < SIZE; ++i) {
258	jsr166	1.16	assertEquals(i, q.element());
259			assertEquals(i, q.poll());
260	dl	1.1	}
261			try {
262			q.element();
263	dl	1.4	shouldThrow();
264	jsr166	1.13	} catch (NoSuchElementException success) {}
265	dl	1.1	}
266
267	dl	1.4	/**
268	jsr166	1.19	* remove removes next element, or throws NSEE if empty
269	dl	1.4	*/
270			public void testRemove() {
271	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
272			for (int i = 0; i < SIZE; ++i) {
273	jsr166	1.16	assertEquals(i, q.remove());
274	dl	1.1	}
275			try {
276			q.remove();
277	dl	1.4	shouldThrow();
278	jsr166	1.13	} catch (NoSuchElementException success) {}
279	dl	1.1	}
280
281	dl	1.4	/**
282	dl	1.5	* remove(x) removes x and returns true if present
283	dl	1.4	*/
284			public void testRemoveElement() {
285	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
286			for (int i = 1; i < SIZE; i+=2) {
287	dl	1.1	assertTrue(q.remove(new Integer(i)));
288			}
289	dl	1.3	for (int i = 0; i < SIZE; i+=2) {
290	dl	1.1	assertTrue(q.remove(new Integer(i)));
291			assertFalse(q.remove(new Integer(i+1)));
292			}
293	dl	1.2	assertTrue(q.isEmpty());
294	dl	1.1	}
295	jsr166	1.8
296	dl	1.4	/**
297	dl	1.5	* contains(x) reports true when elements added but not yet removed
298	dl	1.4	*/
299			public void testContains() {
300	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
301			for (int i = 0; i < SIZE; ++i) {
302	dl	1.1	assertTrue(q.contains(new Integer(i)));
303			q.poll();
304			assertFalse(q.contains(new Integer(i)));
305			}
306			}
307
308	dl	1.4	/**
309	dl	1.5	* clear removes all elements
310	dl	1.4	*/
311			public void testClear() {
312	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
313	dl	1.1	q.clear();
314			assertTrue(q.isEmpty());
315			assertEquals(0, q.size());
316	dl	1.3	q.add(one);
317	dl	1.1	assertFalse(q.isEmpty());
318			q.clear();
319			assertTrue(q.isEmpty());
320			}
321
322	dl	1.4	/**
323	dl	1.5	* containsAll(c) is true when c contains a subset of elements
324	dl	1.4	*/
325			public void testContainsAll() {
326	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
327	dl	1.1	ConcurrentLinkedQueue p = new ConcurrentLinkedQueue();
328	dl	1.3	for (int i = 0; i < SIZE; ++i) {
329	dl	1.1	assertTrue(q.containsAll(p));
330			assertFalse(p.containsAll(q));
331			p.add(new Integer(i));
332			}
333			assertTrue(p.containsAll(q));
334			}
335
336	dl	1.4	/**
337	dl	1.5	* retainAll(c) retains only those elements of c and reports true if change
338	dl	1.4	*/
339			public void testRetainAll() {
340	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
341			ConcurrentLinkedQueue p = populatedQueue(SIZE);
342			for (int i = 0; i < SIZE; ++i) {
343	dl	1.1	boolean changed = q.retainAll(p);
344			if (i == 0)
345			assertFalse(changed);
346			else
347			assertTrue(changed);
348
349			assertTrue(q.containsAll(p));
350	dl	1.3	assertEquals(SIZE-i, q.size());
351	dl	1.1	p.remove();
352			}
353			}
354
355	dl	1.4	/**
356	dl	1.5	* removeAll(c) removes only those elements of c and reports true if changed
357	dl	1.4	*/
358			public void testRemoveAll() {
359	dl	1.3	for (int i = 1; i < SIZE; ++i) {
360			ConcurrentLinkedQueue q = populatedQueue(SIZE);
361			ConcurrentLinkedQueue p = populatedQueue(i);
362	dl	1.1	assertTrue(q.removeAll(p));
363	dl	1.3	assertEquals(SIZE-i, q.size());
364	dl	1.1	for (int j = 0; j < i; ++j) {
365			Integer I = (Integer)(p.remove());
366			assertFalse(q.contains(I));
367			}
368			}
369			}
370
371	dl	1.4	/**
372	dl	1.5	* toArray contains all elements
373	dl	1.4	*/
374			public void testToArray() {
375	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
376	jsr166	1.12	Object[] o = q.toArray();
377	dl	1.1	Arrays.sort(o);
378	jsr166	1.12	for (int i = 0; i < o.length; i++)
379			assertEquals(o[i], q.poll());
380	dl	1.1	}
381
382	dl	1.4	/**
383	jsr166	1.19	* toArray(a) contains all elements
384	dl	1.4	*/
385			public void testToArray2() {
386	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
387	jsr166	1.12	Integer[] ints = new Integer[SIZE];
388			ints = (Integer[])q.toArray(ints);
389	dl	1.1	Arrays.sort(ints);
390	jsr166	1.9	for (int i = 0; i < ints.length; i++)
391	dl	1.1	assertEquals(ints[i], q.poll());
392			}
393	dl	1.5
394			/**
395			* toArray(null) throws NPE
396			*/
397			public void testToArray_BadArg() {
398	jsr166	1.16	ConcurrentLinkedQueue q = populatedQueue(SIZE);
399	jsr166	1.12	try {
400			Object o[] = q.toArray(null);
401			shouldThrow();
402			} catch (NullPointerException success) {}
403	dl	1.5	}
404
405			/**
406	jsr166	1.11	* toArray with incompatible array type throws ArrayStoreException
407	dl	1.5	*/
408			public void testToArray1_BadArg() {
409	jsr166	1.16	ConcurrentLinkedQueue q = populatedQueue(SIZE);
410	jsr166	1.12	try {
411	jsr166	1.16	Object o[] = q.toArray(new String[10]);
412	jsr166	1.12	shouldThrow();
413			} catch (ArrayStoreException success) {}
414	dl	1.5	}
415	jsr166	1.8
416	dl	1.4	/**
417	jsr166	1.19	* iterator iterates through all elements
418	dl	1.4	*/
419			public void testIterator() {
420	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
421	dl	1.1	int i = 0;
422	jsr166	1.12	Iterator it = q.iterator();
423	jsr166	1.9	while (it.hasNext()) {
424	dl	1.1	assertTrue(q.contains(it.next()));
425			++i;
426			}
427	dl	1.3	assertEquals(i, SIZE);
428	dl	1.1	}
429
430	dl	1.4	/**
431	dl	1.5	* iterator ordering is FIFO
432	dl	1.4	*/
433	dl	1.1	public void testIteratorOrdering() {
434			final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
435	dl	1.3	q.add(one);
436			q.add(two);
437			q.add(three);
438	dl	1.1
439			int k = 0;
440			for (Iterator it = q.iterator(); it.hasNext();) {
441	jsr166	1.16	assertEquals(++k, it.next());
442	dl	1.1	}
443
444	dl	1.4	assertEquals(3, k);
445	dl	1.1	}
446
447	dl	1.4	/**
448	dl	1.5	* Modifications do not cause iterators to fail
449	dl	1.4	*/
450	jsr166	1.18	public void testWeaklyConsistentIteration() {
451	dl	1.1	final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
452	dl	1.3	q.add(one);
453			q.add(two);
454			q.add(three);
455	dl	1.1
456	jsr166	1.13	for (Iterator it = q.iterator(); it.hasNext();) {
457			q.remove();
458			it.next();
459	dl	1.1	}
460
461			assertEquals("queue should be empty again", 0, q.size());
462			}
463
464	dl	1.4	/**
465	dl	1.5	* iterator.remove removes current element
466	dl	1.4	*/
467	jsr166	1.18	public void testIteratorRemove() {
468	dl	1.1	final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
469	dl	1.3	q.add(one);
470			q.add(two);
471			q.add(three);
472	dl	1.1	Iterator it = q.iterator();
473			it.next();
474			it.remove();
475			it = q.iterator();
476	jsr166	1.17	assertSame(it.next(), two);
477			assertSame(it.next(), three);
478	dl	1.1	assertFalse(it.hasNext());
479			}
480
481
482	dl	1.4	/**
483	dl	1.5	* toString contains toStrings of elements
484	dl	1.4	*/
485			public void testToString() {
486	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
487	dl	1.1	String s = q.toString();
488	dl	1.3	for (int i = 0; i < SIZE; ++i) {
489	dl	1.1	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
490			}
491	jsr166	1.8	}
492	dl	1.2
493	dl	1.4	/**
494	dl	1.5	* A deserialized serialized queue has same elements in same order
495	dl	1.4	*/
496	jsr166	1.13	public void testSerialization() throws Exception {
497	dl	1.3	ConcurrentLinkedQueue q = populatedQueue(SIZE);
498	jsr166	1.13	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
499			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
500			out.writeObject(q);
501			out.close();
502
503			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
504			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
505			ConcurrentLinkedQueue r = (ConcurrentLinkedQueue)in.readObject();
506			assertEquals(q.size(), r.size());
507			while (!q.isEmpty())
508			assertEquals(q.remove(), r.remove());
509	dl	1.2	}
510	dl	1.1
511			}