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);
        } catch (NullPointerException success) {
        } catch (Exception ex) {
            unexpectedException();
        }
    }

    /**
     * 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);
        } catch (IndexOutOfBoundsException success) {
        }
        try {
            ai.get(-1);
        } catch (IndexOutOfBoundsException success) {
        }
        try {
            ai.set(SIZE, null);
        } catch (IndexOutOfBoundsException success) {
        }
        try {
            ai.set(-1, null);
        } 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() {
        final AtomicReferenceArray a = new AtomicReferenceArray(1);
        a.set(0, one);
        Thread t = new Thread(new Runnable() {
                public void run() {
                    while (!a.compareAndSet(0, two, three)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(a.compareAndSet(0, one, two));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(a.get(0), three);
        }
        catch (Exception e) {
            unexpectedException();
        }
    }

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

        try {
            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));
            }
        } catch (Exception e) {
            unexpectedException();
        }
    }


    /**
     * 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:	1.13
Committed:	Mon Nov 16 05:30:07 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.12:	+13 -14 lines
Log Message:	whitespace
#	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			} catch (NullPointerException success) {
40			} catch (Exception ex) {
41			unexpectedException();
42			}
43			}
44
45			/**
46			* constructor with array is of same size and has all elements
47			*/
48			public void testConstructor2() {
49			Integer[] a = { two, one, three, four, seven};
50			AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
51			assertEquals(a.length, ai.length());
52	jsr166	1.11	for (int i = 0; i < a.length; ++i)
53	dl	1.7	assertEquals(a[i], ai.get(i));
54			}
55
56
57			/**
58	dl	1.5	* get and set for out of bound indices throw IndexOutOfBoundsException
59			*/
60	jsr166	1.13	public void testIndexing() {
61	dl	1.5	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
62			try {
63			ai.get(SIZE);
64	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
65	dl	1.5	}
66			try {
67			ai.get(-1);
68	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
69	dl	1.5	}
70			try {
71			ai.set(SIZE, null);
72	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
73	dl	1.5	}
74			try {
75			ai.set(-1, null);
76	jsr166	1.13	} catch (IndexOutOfBoundsException success) {
77	dl	1.5	}
78			}
79
80			/**
81			* get returns the last value set at index
82	dl	1.4	*/
83	jsr166	1.13	public void testGetSet() {
84	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
85	dl	1.3	for (int i = 0; i < SIZE; ++i) {
86	dl	1.1	ai.set(i, one);
87			assertEquals(one,ai.get(i));
88			ai.set(i, two);
89			assertEquals(two,ai.get(i));
90			ai.set(i, m3);
91			assertEquals(m3,ai.get(i));
92			}
93			}
94
95	dl	1.4	/**
96	dl	1.10	* get returns the last value lazySet at index by same thread
97			*/
98	jsr166	1.13	public void testGetLazySet() {
99	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
100	dl	1.10	for (int i = 0; i < SIZE; ++i) {
101			ai.lazySet(i, one);
102			assertEquals(one,ai.get(i));
103			ai.lazySet(i, two);
104			assertEquals(two,ai.get(i));
105			ai.lazySet(i, m3);
106			assertEquals(m3,ai.get(i));
107			}
108			}
109
110			/**
111	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
112	dl	1.4	*/
113	jsr166	1.13	public void testCompareAndSet() {
114	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
115	dl	1.3	for (int i = 0; i < SIZE; ++i) {
116	dl	1.1	ai.set(i, one);
117			assertTrue(ai.compareAndSet(i, one,two));
118			assertTrue(ai.compareAndSet(i, two,m4));
119			assertEquals(m4,ai.get(i));
120			assertFalse(ai.compareAndSet(i, m5,seven));
121			assertFalse((seven.equals(ai.get(i))));
122			assertTrue(ai.compareAndSet(i, m4,seven));
123			assertEquals(seven,ai.get(i));
124			}
125			}
126
127	dl	1.4	/**
128	dl	1.5	* compareAndSet in one thread enables another waiting for value
129			* to succeed
130			*/
131			public void testCompareAndSetInMultipleThreads() {
132			final AtomicReferenceArray a = new AtomicReferenceArray(1);
133			a.set(0, one);
134			Thread t = new Thread(new Runnable() {
135			public void run() {
136	jsr166	1.12	while (!a.compareAndSet(0, two, three)) Thread.yield();
137	dl	1.5	}});
138			try {
139			t.start();
140			assertTrue(a.compareAndSet(0, one, two));
141			t.join(LONG_DELAY_MS);
142			assertFalse(t.isAlive());
143			assertEquals(a.get(0), three);
144			}
145	jsr166	1.12	catch (Exception e) {
146	dl	1.5	unexpectedException();
147			}
148			}
149
150			/**
151			* repeated weakCompareAndSet succeeds in changing value when equal
152	jsr166	1.11	* to expected
153	dl	1.4	*/
154	jsr166	1.13	public void testWeakCompareAndSet() {
155	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
156	dl	1.3	for (int i = 0; i < SIZE; ++i) {
157	dl	1.1	ai.set(i, one);
158	jsr166	1.12	while (!ai.weakCompareAndSet(i, one,two));
159			while (!ai.weakCompareAndSet(i, two,m4));
160	dl	1.1	assertEquals(m4,ai.get(i));
161	jsr166	1.12	while (!ai.weakCompareAndSet(i, m4,seven));
162	dl	1.1	assertEquals(seven,ai.get(i));
163			}
164			}
165
166	dl	1.4	/**
167	dl	1.5	* getAndSet returns previous value and sets to given value at given index
168	dl	1.4	*/
169	jsr166	1.13	public void testGetAndSet() {
170	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
171	dl	1.3	for (int i = 0; i < SIZE; ++i) {
172	dl	1.1	ai.set(i, one);
173			assertEquals(one,ai.getAndSet(i,zero));
174			assertEquals(0,ai.getAndSet(i,m10));
175			assertEquals(m10,ai.getAndSet(i,one));
176			}
177			}
178
179	dl	1.4	/**
180	dl	1.5	* a deserialized serialized array holds same values
181	dl	1.4	*/
182	dl	1.2	public void testSerialization() {
183	jsr166	1.11	AtomicReferenceArray l = new AtomicReferenceArray(SIZE);
184	dl	1.3	for (int i = 0; i < SIZE; ++i) {
185	dl	1.2	l.set(i, new Integer(-i));
186			}
187
188			try {
189			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
190			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
191			out.writeObject(l);
192			out.close();
193
194			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
195			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
196			AtomicReferenceArray r = (AtomicReferenceArray) in.readObject();
197			assertEquals(l.length(), r.length());
198	dl	1.3	for (int i = 0; i < SIZE; ++i) {
199	dl	1.2	assertEquals(r.get(i), l.get(i));
200			}
201	jsr166	1.13	} catch (Exception e) {
202	dl	1.4	unexpectedException();
203	dl	1.2	}
204			}
205	dl	1.1
206	dl	1.8
207	dl	1.9	/**
208			* toString returns current value.
209	jsr166	1.11	*/
210	dl	1.9	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	dl	1.1	}