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));
    }

    /**
     * Initialize AtomicReference<Class> with SubClass[]
     */
    public void testConstructorSubClassArray() {
        Integer[] a = { two, one, three, four, seven };
        AtomicReferenceArray<Number> aa = new AtomicReferenceArray<Number>(a);
        assertEquals(a.length, aa.length());
        for (int i = 0; i < a.length; ++i) {
            assertSame(a[i], aa.get(i));
            Long x = Long.valueOf(i);
            aa.set(i, x);
            assertSame(x, aa.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:	1.23
Committed:	Fri Jun 10 19:45:01 2011 UTC (12 years, 10 months ago) by jsr166
Branch:	MAIN
Changes since 1.22:	+2 -2 lines
Log Message:	whitespace
#	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	* Initialize AtomicReference<Class> with SubClass[]
55	*/
56	public void testConstructorSubClassArray() {
57	Integer[] a = { two, one, three, four, seven };
58	AtomicReferenceArray<Number> aa = new AtomicReferenceArray<Number>(a);
59	assertEquals(a.length, aa.length());
60	for (int i = 0; i < a.length; ++i) {
61	assertSame(a[i], aa.get(i));
62	Long x = Long.valueOf(i);
63	aa.set(i, x);
64	assertSame(x, aa.get(i));
65	}
66	}
67
68	/**
69	* get and set for out of bound indices throw IndexOutOfBoundsException
70	*/
71	public void testIndexing() {
72	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
73	try {
74	ai.get(SIZE);
75	shouldThrow();
76	} catch (IndexOutOfBoundsException success) {
77	}
78	try {
79	ai.get(-1);
80	shouldThrow();
81	} catch (IndexOutOfBoundsException success) {
82	}
83	try {
84	ai.set(SIZE, null);
85	shouldThrow();
86	} catch (IndexOutOfBoundsException success) {
87	}
88	try {
89	ai.set(-1, null);
90	shouldThrow();
91	} catch (IndexOutOfBoundsException success) {
92	}
93	}
94
95	/**
96	* get returns the last value set at index
97	*/
98	public void testGetSet() {
99	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
100	for (int i = 0; i < SIZE; ++i) {
101	ai.set(i, one);
102	assertSame(one,ai.get(i));
103	ai.set(i, two);
104	assertSame(two,ai.get(i));
105	ai.set(i, m3);
106	assertSame(m3,ai.get(i));
107	}
108	}
109
110	/**
111	* get returns the last value lazySet at index by same thread
112	*/
113	public void testGetLazySet() {
114	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
115	for (int i = 0; i < SIZE; ++i) {
116	ai.lazySet(i, one);
117	assertSame(one,ai.get(i));
118	ai.lazySet(i, two);
119	assertSame(two,ai.get(i));
120	ai.lazySet(i, m3);
121	assertSame(m3,ai.get(i));
122	}
123	}
124
125	/**
126	* compareAndSet succeeds in changing value if equal to expected else fails
127	*/
128	public void testCompareAndSet() {
129	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
130	for (int i = 0; i < SIZE; ++i) {
131	ai.set(i, one);
132	assertTrue(ai.compareAndSet(i, one,two));
133	assertTrue(ai.compareAndSet(i, two,m4));
134	assertSame(m4,ai.get(i));
135	assertFalse(ai.compareAndSet(i, m5,seven));
136	assertSame(m4,ai.get(i));
137	assertTrue(ai.compareAndSet(i, m4,seven));
138	assertSame(seven,ai.get(i));
139	}
140	}
141
142	/**
143	* compareAndSet in one thread enables another waiting for value
144	* to succeed
145	*/
146	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
147	final AtomicReferenceArray a = new AtomicReferenceArray(1);
148	a.set(0, one);
149	Thread t = new Thread(new CheckedRunnable() {
150	public void realRun() {
151	while (!a.compareAndSet(0, two, three))
152	Thread.yield();
153	}});
154
155	t.start();
156	assertTrue(a.compareAndSet(0, one, two));
157	t.join(LONG_DELAY_MS);
158	assertFalse(t.isAlive());
159	assertSame(a.get(0), three);
160	}
161
162	/**
163	* repeated weakCompareAndSet succeeds in changing value when equal
164	* to expected
165	*/
166	public void testWeakCompareAndSet() {
167	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
168	for (int i = 0; i < SIZE; ++i) {
169	ai.set(i, one);
170	while (!ai.weakCompareAndSet(i, one,two));
171	while (!ai.weakCompareAndSet(i, two,m4));
172	assertSame(m4,ai.get(i));
173	while (!ai.weakCompareAndSet(i, m4,seven));
174	assertSame(seven,ai.get(i));
175	}
176	}
177
178	/**
179	* getAndSet returns previous value and sets to given value at given index
180	*/
181	public void testGetAndSet() {
182	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
183	for (int i = 0; i < SIZE; ++i) {
184	ai.set(i, one);
185	assertSame(one,ai.getAndSet(i,zero));
186	assertSame(zero,ai.getAndSet(i,m10));
187	assertSame(m10,ai.getAndSet(i,one));
188	}
189	}
190
191	/**
192	* a deserialized serialized array holds same values
193	*/
194	public void testSerialization() throws Exception {
195	AtomicReferenceArray x = new AtomicReferenceArray(SIZE);
196	for (int i = 0; i < SIZE; i++) {
197	x.set(i, new Integer(-i));
198	}
199	AtomicReferenceArray y = serialClone(x);
200	assertTrue(x != y);
201	assertEquals(x.length(), y.length());
202	for (int i = 0; i < SIZE; i++) {
203	assertEquals(x.get(i), y.get(i));
204	}
205	}
206
207	/**
208	* toString returns current value.
209	*/
210	public void testToString() {
211	Integer[] a = { two, one, three, four, seven };
212	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
213	assertEquals(Arrays.toString(a), ai.toString());
214	}
215	}