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.concurrent.atomic.*;
import java.io.*;
import java.util.*;

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 l = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            l.set(i, new Integer(-i));
        }

        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
        out.writeObject(l);
        out.close();

        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
        AtomicReferenceArray r = (AtomicReferenceArray) in.readObject();
        assertEquals(l.length(), r.length());
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(r.get(i), l.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:	1.20
Committed:	Fri May 27 19:39:07 2011 UTC (12 years, 11 months ago) by jsr166
Branch:	MAIN
Changes since 1.19:	+0 -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.concurrent.atomic.*;
11	import java.io.*;
12	import java.util.*;
13
14	public class AtomicReferenceArrayTest extends JSR166TestCase {
15	public static void main(String[] args) {
16	junit.textui.TestRunner.run(suite());
17	}
18	public static Test suite() {
19	return new TestSuite(AtomicReferenceArrayTest.class);
20	}
21
22	/**
23	* constructor creates array of given size with all elements null
24	*/
25	public void testConstructor() {
26	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
27	for (int i = 0; i < SIZE; ++i) {
28	assertNull(ai.get(i));
29	}
30	}
31
32	/**
33	* constructor with null array throws NPE
34	*/
35	public void testConstructor2NPE() {
36	try {
37	Integer[] a = null;
38	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
39	shouldThrow();
40	} catch (NullPointerException success) {}
41	}
42
43	/**
44	* constructor with array is of same size and has all elements
45	*/
46	public void testConstructor2() {
47	Integer[] a = { two, one, three, four, seven};
48	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
49	assertEquals(a.length, ai.length());
50	for (int i = 0; i < a.length; ++i)
51	assertEquals(a[i], ai.get(i));
52	}
53
54	/**
55	* get and set for out of bound indices throw IndexOutOfBoundsException
56	*/
57	public void testIndexing() {
58	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
59	try {
60	ai.get(SIZE);
61	shouldThrow();
62	} catch (IndexOutOfBoundsException success) {
63	}
64	try {
65	ai.get(-1);
66	shouldThrow();
67	} catch (IndexOutOfBoundsException success) {
68	}
69	try {
70	ai.set(SIZE, null);
71	shouldThrow();
72	} catch (IndexOutOfBoundsException success) {
73	}
74	try {
75	ai.set(-1, null);
76	shouldThrow();
77	} catch (IndexOutOfBoundsException success) {
78	}
79	}
80
81	/**
82	* get returns the last value set at index
83	*/
84	public void testGetSet() {
85	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
86	for (int i = 0; i < SIZE; ++i) {
87	ai.set(i, one);
88	assertSame(one,ai.get(i));
89	ai.set(i, two);
90	assertSame(two,ai.get(i));
91	ai.set(i, m3);
92	assertSame(m3,ai.get(i));
93	}
94	}
95
96	/**
97	* get returns the last value lazySet at index by same thread
98	*/
99	public void testGetLazySet() {
100	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
101	for (int i = 0; i < SIZE; ++i) {
102	ai.lazySet(i, one);
103	assertSame(one,ai.get(i));
104	ai.lazySet(i, two);
105	assertSame(two,ai.get(i));
106	ai.lazySet(i, m3);
107	assertSame(m3,ai.get(i));
108	}
109	}
110
111	/**
112	* compareAndSet succeeds in changing value if equal to expected else fails
113	*/
114	public void testCompareAndSet() {
115	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
116	for (int i = 0; i < SIZE; ++i) {
117	ai.set(i, one);
118	assertTrue(ai.compareAndSet(i, one,two));
119	assertTrue(ai.compareAndSet(i, two,m4));
120	assertSame(m4,ai.get(i));
121	assertFalse(ai.compareAndSet(i, m5,seven));
122	assertSame(m4,ai.get(i));
123	assertTrue(ai.compareAndSet(i, m4,seven));
124	assertSame(seven,ai.get(i));
125	}
126	}
127
128	/**
129	* compareAndSet in one thread enables another waiting for value
130	* to succeed
131	*/
132	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
133	final AtomicReferenceArray a = new AtomicReferenceArray(1);
134	a.set(0, one);
135	Thread t = new Thread(new CheckedRunnable() {
136	public void realRun() {
137	while (!a.compareAndSet(0, two, three))
138	Thread.yield();
139	}});
140
141	t.start();
142	assertTrue(a.compareAndSet(0, one, two));
143	t.join(LONG_DELAY_MS);
144	assertFalse(t.isAlive());
145	assertSame(a.get(0), three);
146	}
147
148	/**
149	* repeated weakCompareAndSet succeeds in changing value when equal
150	* to expected
151	*/
152	public void testWeakCompareAndSet() {
153	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
154	for (int i = 0; i < SIZE; ++i) {
155	ai.set(i, one);
156	while (!ai.weakCompareAndSet(i, one,two));
157	while (!ai.weakCompareAndSet(i, two,m4));
158	assertSame(m4,ai.get(i));
159	while (!ai.weakCompareAndSet(i, m4,seven));
160	assertSame(seven,ai.get(i));
161	}
162	}
163
164	/**
165	* getAndSet returns previous value and sets to given value at given index
166	*/
167	public void testGetAndSet() {
168	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
169	for (int i = 0; i < SIZE; ++i) {
170	ai.set(i, one);
171	assertSame(one,ai.getAndSet(i,zero));
172	assertSame(zero,ai.getAndSet(i,m10));
173	assertSame(m10,ai.getAndSet(i,one));
174	}
175	}
176
177	/**
178	* a deserialized serialized array holds same values
179	*/
180	public void testSerialization() throws Exception {
181	AtomicReferenceArray l = new AtomicReferenceArray(SIZE);
182	for (int i = 0; i < SIZE; ++i) {
183	l.set(i, new Integer(-i));
184	}
185
186	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
187	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
188	out.writeObject(l);
189	out.close();
190
191	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
192	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
193	AtomicReferenceArray r = (AtomicReferenceArray) in.readObject();
194	assertEquals(l.length(), r.length());
195	for (int i = 0; i < SIZE; ++i) {
196	assertEquals(r.get(i), l.get(i));
197	}
198	}
199
200	/**
201	* toString returns current value.
202	*/
203	public void testToString() {
204	Integer[] a = { two, one, three, four, seven};
205	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
206	assertEquals(Arrays.toString(a), ai.toString());
207	}
208	}