test/tck/AtomicReferenceArrayTest.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/publicdomain/zero/1.0/
 * Other contributors include Andrew Wright, Jeffrey Hayes,
 * Pat Fisher, Mike Judd.
 */

import junit.framework.*;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicReferenceArray;

public class AtomicReferenceArrayTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run(suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicReferenceArrayTest.class);
    }

    /**
     * constructor creates array of given size with all elements null
     */
    public void testConstructor() {
        AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertNull(ai.get(i));
        }
    }

    /**
     * constructor with null array throws NPE
     */
    public void testConstructor2NPE() {
        try {
            Integer[] a = null;
            AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
            shouldThrow();
        } catch (NullPointerException success) {}
    }

    /**
     * constructor with array is of same size and has all elements
     */
    public void testConstructor2() {
        Integer[] a = { two, one, three, four, seven};
        AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
        assertEquals(a.length, ai.length());
        for (int i = 0; i < a.length; ++i)
            assertEquals(a[i], ai.get(i));
    }

    /**
     * get and set for out of bound indices throw IndexOutOfBoundsException
     */
    public void testIndexing() {
        AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
        try {
            ai.get(SIZE);
            shouldThrow();
        } catch (IndexOutOfBoundsException success) {
        }
        try {
            ai.get(-1);
            shouldThrow();
        } catch (IndexOutOfBoundsException success) {
        }
        try {
            ai.set(SIZE, null);
            shouldThrow();
        } catch (IndexOutOfBoundsException success) {
        }
        try {
            ai.set(-1, null);
            shouldThrow();
        } catch (IndexOutOfBoundsException success) {
        }
    }

    /**
     * get returns the last value set at index
     */
    public void testGetSet() {
        AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, one);
            assertSame(one,ai.get(i));
            ai.set(i, two);
            assertSame(two,ai.get(i));
            ai.set(i, m3);
            assertSame(m3,ai.get(i));
        }
    }

    /**
     * get returns the last value lazySet at index by same thread
     */
    public void testGetLazySet() {
        AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            ai.lazySet(i, one);
            assertSame(one,ai.get(i));
            ai.lazySet(i, two);
            assertSame(two,ai.get(i));
            ai.lazySet(i, m3);
            assertSame(m3,ai.get(i));
        }
    }

    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet() {
        AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, one);
            assertTrue(ai.compareAndSet(i, one,two));
            assertTrue(ai.compareAndSet(i, two,m4));
            assertSame(m4,ai.get(i));
            assertFalse(ai.compareAndSet(i, m5,seven));
            assertSame(m4,ai.get(i));
            assertTrue(ai.compareAndSet(i, m4,seven));
            assertSame(seven,ai.get(i));
        }
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() throws InterruptedException {
        final AtomicReferenceArray a = new AtomicReferenceArray(1);
        a.set(0, one);
        Thread t = new Thread(new CheckedRunnable() {
            public void realRun() {
                while (!a.compareAndSet(0, two, three))
                    Thread.yield();
            }});

        t.start();
        assertTrue(a.compareAndSet(0, one, two));
        t.join(LONG_DELAY_MS);
        assertFalse(t.isAlive());
        assertSame(a.get(0), three);
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected
     */
    public void testWeakCompareAndSet() {
        AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, one);
            while (!ai.weakCompareAndSet(i, one,two));
            while (!ai.weakCompareAndSet(i, two,m4));
            assertSame(m4,ai.get(i));
            while (!ai.weakCompareAndSet(i, m4,seven));
            assertSame(seven,ai.get(i));
        }
    }

    /**
     * getAndSet returns previous value and sets to given value at given index
     */
    public void testGetAndSet() {
        AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            ai.set(i, one);
            assertSame(one,ai.getAndSet(i,zero));
            assertSame(zero,ai.getAndSet(i,m10));
            assertSame(m10,ai.getAndSet(i,one));
        }
    }

    /**
     * a deserialized serialized array holds same values
     */
    public void testSerialization() throws Exception {
        AtomicReferenceArray x = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            x.set(i, new Integer(-i));
        }
        AtomicReferenceArray y = serialClone(x);
        assertTrue(x != y);
        assertEquals(x.length(), y.length());
        for (int i = 0; i < SIZE; i++) {
            assertEquals(x.get(i), y.get(i));
        }
    }

    /**
     * toString returns current value.
     */
    public void testToString() {
        Integer[] a = { two, one, three, four, seven};
        AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
        assertEquals(Arrays.toString(a), ai.toString());
    }
}
Revision:	1.21
Committed:	Tue May 31 16:16:23 2011 UTC (12 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.20:	+11 -19 lines
Log Message:	use serialClone in serialization tests; update imports
#	Content
1	/*
2	* 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/publicdomain/zero/1.0/
5	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	* Pat Fisher, Mike Judd.
7	*/
8
9	import junit.framework.*;
10	import java.util.Arrays;
11	import java.util.concurrent.atomic.AtomicReferenceArray;
12
13	public class AtomicReferenceArrayTest extends JSR166TestCase {
14	public static void main(String[] args) {
15	junit.textui.TestRunner.run(suite());
16	}
17	public static Test suite() {
18	return new TestSuite(AtomicReferenceArrayTest.class);
19	}
20
21	/**
22	* constructor creates array of given size with all elements null
23	*/
24	public void testConstructor() {
25	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
26	for (int i = 0; i < SIZE; ++i) {
27	assertNull(ai.get(i));
28	}
29	}
30
31	/**
32	* constructor with null array throws NPE
33	*/
34	public void testConstructor2NPE() {
35	try {
36	Integer[] a = null;
37	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
38	shouldThrow();
39	} catch (NullPointerException success) {}
40	}
41
42	/**
43	* constructor with array is of same size and has all elements
44	*/
45	public void testConstructor2() {
46	Integer[] a = { two, one, three, four, seven};
47	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
48	assertEquals(a.length, ai.length());
49	for (int i = 0; i < a.length; ++i)
50	assertEquals(a[i], ai.get(i));
51	}
52
53	/**
54	* get and set for out of bound indices throw IndexOutOfBoundsException
55	*/
56	public void testIndexing() {
57	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
58	try {
59	ai.get(SIZE);
60	shouldThrow();
61	} catch (IndexOutOfBoundsException success) {
62	}
63	try {
64	ai.get(-1);
65	shouldThrow();
66	} catch (IndexOutOfBoundsException success) {
67	}
68	try {
69	ai.set(SIZE, null);
70	shouldThrow();
71	} catch (IndexOutOfBoundsException success) {
72	}
73	try {
74	ai.set(-1, null);
75	shouldThrow();
76	} catch (IndexOutOfBoundsException success) {
77	}
78	}
79
80	/**
81	* get returns the last value set at index
82	*/
83	public void testGetSet() {
84	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
85	for (int i = 0; i < SIZE; ++i) {
86	ai.set(i, one);
87	assertSame(one,ai.get(i));
88	ai.set(i, two);
89	assertSame(two,ai.get(i));
90	ai.set(i, m3);
91	assertSame(m3,ai.get(i));
92	}
93	}
94
95	/**
96	* get returns the last value lazySet at index by same thread
97	*/
98	public void testGetLazySet() {
99	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
100	for (int i = 0; i < SIZE; ++i) {
101	ai.lazySet(i, one);
102	assertSame(one,ai.get(i));
103	ai.lazySet(i, two);
104	assertSame(two,ai.get(i));
105	ai.lazySet(i, m3);
106	assertSame(m3,ai.get(i));
107	}
108	}
109
110	/**
111	* compareAndSet succeeds in changing value if equal to expected else fails
112	*/
113	public void testCompareAndSet() {
114	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
115	for (int i = 0; i < SIZE; ++i) {
116	ai.set(i, one);
117	assertTrue(ai.compareAndSet(i, one,two));
118	assertTrue(ai.compareAndSet(i, two,m4));
119	assertSame(m4,ai.get(i));
120	assertFalse(ai.compareAndSet(i, m5,seven));
121	assertSame(m4,ai.get(i));
122	assertTrue(ai.compareAndSet(i, m4,seven));
123	assertSame(seven,ai.get(i));
124	}
125	}
126
127	/**
128	* compareAndSet in one thread enables another waiting for value
129	* to succeed
130	*/
131	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
132	final AtomicReferenceArray a = new AtomicReferenceArray(1);
133	a.set(0, one);
134	Thread t = new Thread(new CheckedRunnable() {
135	public void realRun() {
136	while (!a.compareAndSet(0, two, three))
137	Thread.yield();
138	}});
139
140	t.start();
141	assertTrue(a.compareAndSet(0, one, two));
142	t.join(LONG_DELAY_MS);
143	assertFalse(t.isAlive());
144	assertSame(a.get(0), three);
145	}
146
147	/**
148	* repeated weakCompareAndSet succeeds in changing value when equal
149	* to expected
150	*/
151	public void testWeakCompareAndSet() {
152	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
153	for (int i = 0; i < SIZE; ++i) {
154	ai.set(i, one);
155	while (!ai.weakCompareAndSet(i, one,two));
156	while (!ai.weakCompareAndSet(i, two,m4));
157	assertSame(m4,ai.get(i));
158	while (!ai.weakCompareAndSet(i, m4,seven));
159	assertSame(seven,ai.get(i));
160	}
161	}
162
163	/**
164	* getAndSet returns previous value and sets to given value at given index
165	*/
166	public void testGetAndSet() {
167	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
168	for (int i = 0; i < SIZE; ++i) {
169	ai.set(i, one);
170	assertSame(one,ai.getAndSet(i,zero));
171	assertSame(zero,ai.getAndSet(i,m10));
172	assertSame(m10,ai.getAndSet(i,one));
173	}
174	}
175
176	/**
177	* a deserialized serialized array holds same values
178	*/
179	public void testSerialization() throws Exception {
180	AtomicReferenceArray x = new AtomicReferenceArray(SIZE);
181	for (int i = 0; i < SIZE; i++) {
182	x.set(i, new Integer(-i));
183	}
184	AtomicReferenceArray y = serialClone(x);
185	assertTrue(x != y);
186	assertEquals(x.length(), y.length());
187	for (int i = 0; i < SIZE; i++) {
188	assertEquals(x.get(i), y.get(i));
189	}
190	}
191
192	/**
193	* toString returns current value.
194	*/
195	public void testToString() {
196	Integer[] a = { two, one, three, four, seven};
197	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
198	assertEquals(Arrays.toString(a), ai.toString());
199	}
200	}