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 java.util.Arrays;
import java.util.concurrent.atomic.AtomicReferenceArray;

import junit.framework.Test;
import junit.framework.TestSuite;

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> aa = new AtomicReferenceArray<Integer>(SIZE);
        for (int i = 0; i < SIZE; i++) {
            assertNull(aa.get(i));
        }
    }

    /**
     * constructor with null array throws NPE
     */
    public void testConstructor2NPE() {
        try {
            Integer[] a = null;
            AtomicReferenceArray<Integer> aa = 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> aa = new AtomicReferenceArray<Integer>(a);
        assertEquals(a.length, aa.length());
        for (int i = 0; i < a.length; i++)
            assertEquals(a[i], aa.get(i));
    }

    /**
     * Initialize AtomicReferenceArray<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> aa = new AtomicReferenceArray<Integer>(SIZE);
        for (int index : new int[] { -1, SIZE }) {
            try {
                aa.get(index);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.set(index, null);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.lazySet(index, null);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.compareAndSet(index, null, null);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
            try {
                aa.weakCompareAndSet(index, null, null);
                shouldThrow();
            } catch (IndexOutOfBoundsException success) {}
        }
    }

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

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

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

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

    /**
     * getAndSet returns previous value and sets to given value at given index
     */
    public void testGetAndSet() {
        AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
        for (int i = 0; i < SIZE; i++) {
            aa.set(i, one);
            assertSame(one, aa.getAndSet(i, zero));
            assertSame(zero, aa.getAndSet(i, m10));
            assertSame(m10, aa.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);
        assertNotSame(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> aa = new AtomicReferenceArray<Integer>(a);
        assertEquals(Arrays.toString(a), aa.toString());
    }
}
Revision:	1.30
Committed:	Wed Dec 31 19:21:20 2014 UTC (9 years, 4 months ago) by jsr166
Branch:	MAIN
Changes since 1.29:	+3 -3 lines
Log Message:	prefer do {} while (...); to while (...);
#	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	jsr166	1.19	* http://creativecommons.org/publicdomain/zero/1.0/
5	jsr166	1.11	* Other contributors include Andrew Wright, Jeffrey Hayes,
6			* Pat Fisher, Mike Judd.
7	dl	1.1	*/
8
9	jsr166	1.21	import java.util.Arrays;
10			import java.util.concurrent.atomic.AtomicReferenceArray;
11	dl	1.1
12	jsr166	1.29	import junit.framework.Test;
13			import junit.framework.TestSuite;
14
15	jsr166	1.13	public class AtomicReferenceArrayTest extends JSR166TestCase {
16	jsr166	1.18	public static void main(String[] args) {
17			junit.textui.TestRunner.run(suite());
18	dl	1.1	}
19			public static Test suite() {
20			return new TestSuite(AtomicReferenceArrayTest.class);
21			}
22
23	dl	1.4	/**
24	dl	1.5	* constructor creates array of given size with all elements null
25	dl	1.4	*/
26	jsr166	1.13	public void testConstructor() {
27	jsr166	1.26	AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(SIZE);
28			for (int i = 0; i < SIZE; i++) {
29			assertNull(aa.get(i));
30	dl	1.1	}
31			}
32
33	dl	1.4	/**
34	dl	1.7	* constructor with null array throws NPE
35			*/
36			public void testConstructor2NPE() {
37			try {
38			Integer[] a = null;
39	jsr166	1.26	AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(a);
40	jsr166	1.14	shouldThrow();
41	jsr166	1.15	} catch (NullPointerException success) {}
42	dl	1.7	}
43
44			/**
45			* constructor with array is of same size and has all elements
46			*/
47			public void testConstructor2() {
48	jsr166	1.23	Integer[] a = { two, one, three, four, seven };
49	jsr166	1.26	AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(a);
50			assertEquals(a.length, aa.length());
51			for (int i = 0; i < a.length; i++)
52			assertEquals(a[i], aa.get(i));
53	dl	1.7	}
54
55			/**
56	jsr166	1.27	* Initialize AtomicReferenceArray<Class> with SubClass[]
57	jsr166	1.22	*/
58			public void testConstructorSubClassArray() {
59			Integer[] a = { two, one, three, four, seven };
60			AtomicReferenceArray<Number> aa = new AtomicReferenceArray<Number>(a);
61			assertEquals(a.length, aa.length());
62	jsr166	1.26	for (int i = 0; i < a.length; i++) {
63	jsr166	1.22	assertSame(a[i], aa.get(i));
64			Long x = Long.valueOf(i);
65			aa.set(i, x);
66			assertSame(x, aa.get(i));
67			}
68			}
69
70			/**
71	dl	1.5	* get and set for out of bound indices throw IndexOutOfBoundsException
72			*/
73	jsr166	1.13	public void testIndexing() {
74	jsr166	1.26	AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(SIZE);
75			for (int index : new int[] { -1, SIZE }) {
76			try {
77			aa.get(index);
78			shouldThrow();
79			} catch (IndexOutOfBoundsException success) {}
80			try {
81			aa.set(index, null);
82			shouldThrow();
83			} catch (IndexOutOfBoundsException success) {}
84			try {
85			aa.lazySet(index, null);
86			shouldThrow();
87			} catch (IndexOutOfBoundsException success) {}
88			try {
89			aa.compareAndSet(index, null, null);
90			shouldThrow();
91			} catch (IndexOutOfBoundsException success) {}
92			try {
93			aa.weakCompareAndSet(index, null, null);
94			shouldThrow();
95			} catch (IndexOutOfBoundsException success) {}
96	dl	1.5	}
97			}
98
99			/**
100			* get returns the last value set at index
101	dl	1.4	*/
102	jsr166	1.13	public void testGetSet() {
103	jsr166	1.26	AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
104			for (int i = 0; i < SIZE; i++) {
105			aa.set(i, one);
106			assertSame(one, aa.get(i));
107			aa.set(i, two);
108			assertSame(two, aa.get(i));
109			aa.set(i, m3);
110			assertSame(m3, aa.get(i));
111	dl	1.1	}
112			}
113
114	dl	1.4	/**
115	dl	1.10	* get returns the last value lazySet at index by same thread
116			*/
117	jsr166	1.13	public void testGetLazySet() {
118	jsr166	1.26	AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
119			for (int i = 0; i < SIZE; i++) {
120			aa.lazySet(i, one);
121			assertSame(one, aa.get(i));
122			aa.lazySet(i, two);
123			assertSame(two, aa.get(i));
124			aa.lazySet(i, m3);
125			assertSame(m3, aa.get(i));
126	dl	1.10	}
127			}
128
129			/**
130	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
131	dl	1.4	*/
132	jsr166	1.13	public void testCompareAndSet() {
133	jsr166	1.26	AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
134			for (int i = 0; i < SIZE; i++) {
135			aa.set(i, one);
136			assertTrue(aa.compareAndSet(i, one, two));
137			assertTrue(aa.compareAndSet(i, two, m4));
138			assertSame(m4, aa.get(i));
139			assertFalse(aa.compareAndSet(i, m5, seven));
140			assertSame(m4, aa.get(i));
141			assertTrue(aa.compareAndSet(i, m4, seven));
142			assertSame(seven, aa.get(i));
143	dl	1.1	}
144			}
145
146	dl	1.4	/**
147	dl	1.5	* compareAndSet in one thread enables another waiting for value
148			* to succeed
149			*/
150	jsr166	1.15	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
151	dl	1.5	final AtomicReferenceArray a = new AtomicReferenceArray(1);
152			a.set(0, one);
153	jsr166	1.16	Thread t = new Thread(new CheckedRunnable() {
154			public void realRun() {
155			while (!a.compareAndSet(0, two, three))
156			Thread.yield();
157			}});
158	jsr166	1.15
159			t.start();
160			assertTrue(a.compareAndSet(0, one, two));
161			t.join(LONG_DELAY_MS);
162			assertFalse(t.isAlive());
163	jsr166	1.25	assertSame(three, a.get(0));
164	dl	1.5	}
165
166			/**
167			* repeated weakCompareAndSet succeeds in changing value when equal
168	jsr166	1.11	* to expected
169	dl	1.4	*/
170	jsr166	1.13	public void testWeakCompareAndSet() {
171	jsr166	1.26	AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
172			for (int i = 0; i < SIZE; i++) {
173			aa.set(i, one);
174	jsr166	1.30	do {} while (!aa.weakCompareAndSet(i, one, two));
175			do {} while (!aa.weakCompareAndSet(i, two, m4));
176	jsr166	1.26	assertSame(m4, aa.get(i));
177	jsr166	1.30	do {} while (!aa.weakCompareAndSet(i, m4, seven));
178	jsr166	1.26	assertSame(seven, aa.get(i));
179	dl	1.1	}
180			}
181
182	dl	1.4	/**
183	dl	1.5	* getAndSet returns previous value and sets to given value at given index
184	dl	1.4	*/
185	jsr166	1.13	public void testGetAndSet() {
186	jsr166	1.26	AtomicReferenceArray aa = new AtomicReferenceArray(SIZE);
187			for (int i = 0; i < SIZE; i++) {
188			aa.set(i, one);
189			assertSame(one, aa.getAndSet(i, zero));
190			assertSame(zero, aa.getAndSet(i, m10));
191			assertSame(m10, aa.getAndSet(i, one));
192	dl	1.1	}
193			}
194
195	dl	1.4	/**
196	dl	1.5	* a deserialized serialized array holds same values
197	dl	1.4	*/
198	jsr166	1.15	public void testSerialization() throws Exception {
199	jsr166	1.21	AtomicReferenceArray x = new AtomicReferenceArray(SIZE);
200			for (int i = 0; i < SIZE; i++) {
201			x.set(i, new Integer(-i));
202			}
203			AtomicReferenceArray y = serialClone(x);
204	jsr166	1.28	assertNotSame(x, y);
205	jsr166	1.21	assertEquals(x.length(), y.length());
206			for (int i = 0; i < SIZE; i++) {
207			assertEquals(x.get(i), y.get(i));
208	dl	1.2	}
209			}
210	dl	1.1
211	dl	1.9	/**
212			* toString returns current value.
213	jsr166	1.11	*/
214	dl	1.9	public void testToString() {
215	jsr166	1.23	Integer[] a = { two, one, three, four, seven };
216	jsr166	1.26	AtomicReferenceArray<Integer> aa = new AtomicReferenceArray<Integer>(a);
217			assertEquals(Arrays.toString(a), aa.toString());
218	dl	1.9	}
219	dl	1.1	}