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/licenses/publicdomain
 * 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);
            assertEquals(one,ai.get(i));
            ai.set(i, two);
            assertEquals(two,ai.get(i));
            ai.set(i, m3);
            assertEquals(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);
            assertEquals(one,ai.get(i));
            ai.lazySet(i, two);
            assertEquals(two,ai.get(i));
            ai.lazySet(i, m3);
            assertEquals(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));
            assertEquals(m4,ai.get(i));
            assertFalse(ai.compareAndSet(i, m5,seven));
            assertFalse((seven.equals(ai.get(i))));
            assertTrue(ai.compareAndSet(i, m4,seven));
            assertEquals(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());
        assertEquals(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));
            assertEquals(m4,ai.get(i));
            while (!ai.weakCompareAndSet(i, m4,seven));
            assertEquals(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);
            assertEquals(one,ai.getAndSet(i,zero));
            assertEquals(0,ai.getAndSet(i,m10));
            assertEquals(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:	1.16
Committed:	Tue Nov 17 06:58:50 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.15:	+5 -4 lines
Log Message:	Runnable => CheckedRunnable
#	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	1.11	* 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.concurrent.atomic.*;
11	dl	1.2	import java.io.*;
12	dl	1.9	import java.util.*;
13	dl	1.1
14	jsr166	1.13	public class AtomicReferenceArrayTest extends JSR166TestCase {
15	dl	1.1	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	dl	1.4	/**
23	dl	1.5	* constructor creates array of given size with all elements null
24	dl	1.4	*/
25	jsr166	1.13	public void testConstructor() {
26	dl	1.3	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
27			for (int i = 0; i < SIZE; ++i) {
28	dl	1.1	assertNull(ai.get(i));
29			}
30			}
31
32	dl	1.4	/**
33	dl	1.7	* 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	jsr166	1.14	shouldThrow();
40	jsr166	1.15	} catch (NullPointerException success) {}
41	dl	1.7	}
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	jsr166	1.11	for (int i = 0; i < a.length; ++i)
51	dl	1.7	assertEquals(a[i], ai.get(i));
52			}
53
54
55			/**
56	dl	1.5	* get and set for out of bound indices throw IndexOutOfBoundsException
57			*/
58	jsr166	1.13	public void testIndexing() {
59	dl	1.5	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
60			try {
61			ai.get(SIZE);
62	jsr166	1.14	shouldThrow();
63	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
64	dl	1.5	}
65			try {
66			ai.get(-1);
67	jsr166	1.14	shouldThrow();
68	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
69	dl	1.5	}
70			try {
71			ai.set(SIZE, null);
72	jsr166	1.14	shouldThrow();
73	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
74	dl	1.5	}
75			try {
76			ai.set(-1, null);
77	jsr166	1.14	shouldThrow();
78	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
79	dl	1.5	}
80			}
81
82			/**
83			* get returns the last value set at index
84	dl	1.4	*/
85	jsr166	1.13	public void testGetSet() {
86	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
87	dl	1.3	for (int i = 0; i < SIZE; ++i) {
88	dl	1.1	ai.set(i, one);
89			assertEquals(one,ai.get(i));
90			ai.set(i, two);
91			assertEquals(two,ai.get(i));
92			ai.set(i, m3);
93			assertEquals(m3,ai.get(i));
94			}
95			}
96
97	dl	1.4	/**
98	dl	1.10	* get returns the last value lazySet at index by same thread
99			*/
100	jsr166	1.13	public void testGetLazySet() {
101	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
102	dl	1.10	for (int i = 0; i < SIZE; ++i) {
103			ai.lazySet(i, one);
104			assertEquals(one,ai.get(i));
105			ai.lazySet(i, two);
106			assertEquals(two,ai.get(i));
107			ai.lazySet(i, m3);
108			assertEquals(m3,ai.get(i));
109			}
110			}
111
112			/**
113	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
114	dl	1.4	*/
115	jsr166	1.13	public void testCompareAndSet() {
116	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
117	dl	1.3	for (int i = 0; i < SIZE; ++i) {
118	dl	1.1	ai.set(i, one);
119			assertTrue(ai.compareAndSet(i, one,two));
120			assertTrue(ai.compareAndSet(i, two,m4));
121			assertEquals(m4,ai.get(i));
122			assertFalse(ai.compareAndSet(i, m5,seven));
123			assertFalse((seven.equals(ai.get(i))));
124			assertTrue(ai.compareAndSet(i, m4,seven));
125			assertEquals(seven,ai.get(i));
126			}
127			}
128
129	dl	1.4	/**
130	dl	1.5	* compareAndSet in one thread enables another waiting for value
131			* to succeed
132			*/
133	jsr166	1.15	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
134	dl	1.5	final AtomicReferenceArray a = new AtomicReferenceArray(1);
135			a.set(0, one);
136	jsr166	1.16	Thread t = new Thread(new CheckedRunnable() {
137			public void realRun() {
138			while (!a.compareAndSet(0, two, three))
139			Thread.yield();
140			}});
141	jsr166	1.15
142			t.start();
143			assertTrue(a.compareAndSet(0, one, two));
144			t.join(LONG_DELAY_MS);
145			assertFalse(t.isAlive());
146			assertEquals(a.get(0), three);
147	dl	1.5	}
148
149			/**
150			* repeated weakCompareAndSet succeeds in changing value when equal
151	jsr166	1.11	* to expected
152	dl	1.4	*/
153	jsr166	1.13	public void testWeakCompareAndSet() {
154	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
155	dl	1.3	for (int i = 0; i < SIZE; ++i) {
156	dl	1.1	ai.set(i, one);
157	jsr166	1.12	while (!ai.weakCompareAndSet(i, one,two));
158			while (!ai.weakCompareAndSet(i, two,m4));
159	dl	1.1	assertEquals(m4,ai.get(i));
160	jsr166	1.12	while (!ai.weakCompareAndSet(i, m4,seven));
161	dl	1.1	assertEquals(seven,ai.get(i));
162			}
163			}
164
165	dl	1.4	/**
166	dl	1.5	* getAndSet returns previous value and sets to given value at given index
167	dl	1.4	*/
168	jsr166	1.13	public void testGetAndSet() {
169	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
170	dl	1.3	for (int i = 0; i < SIZE; ++i) {
171	dl	1.1	ai.set(i, one);
172			assertEquals(one,ai.getAndSet(i,zero));
173			assertEquals(0,ai.getAndSet(i,m10));
174			assertEquals(m10,ai.getAndSet(i,one));
175			}
176			}
177
178	dl	1.4	/**
179	dl	1.5	* a deserialized serialized array holds same values
180	dl	1.4	*/
181	jsr166	1.15	public void testSerialization() throws Exception {
182	jsr166	1.11	AtomicReferenceArray l = new AtomicReferenceArray(SIZE);
183	dl	1.3	for (int i = 0; i < SIZE; ++i) {
184	dl	1.2	l.set(i, new Integer(-i));
185			}
186
187	jsr166	1.15	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
188			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
189			out.writeObject(l);
190			out.close();
191
192			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
193			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
194			AtomicReferenceArray r = (AtomicReferenceArray) in.readObject();
195			assertEquals(l.length(), r.length());
196			for (int i = 0; i < SIZE; ++i) {
197			assertEquals(r.get(i), l.get(i));
198	dl	1.2	}
199			}
200	dl	1.1
201	dl	1.8
202	dl	1.9	/**
203			* toString returns current value.
204	jsr166	1.11	*/
205	dl	1.9	public void testToString() {
206			Integer[] a = { two, one, three, four, seven};
207			AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
208			assertEquals(Arrays.toString(a), ai.toString());
209			}
210	dl	1.1	}