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:	1.12
Committed:	Mon Nov 16 04:57:10 2009 UTC (14 years, 5 months ago) by jsr166
Branch:	MAIN
Changes since 1.11:	+10 -10 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	1.11	public class AtomicReferenceArrayTest extends JSR166TestCase
15	dl	1.1	{
16			public static void main (String[] args) {
17			junit.textui.TestRunner.run (suite());
18			}
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	dl	1.1	public void testConstructor(){
27	dl	1.3	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
28			for (int i = 0; i < SIZE; ++i) {
29	dl	1.1	assertNull(ai.get(i));
30			}
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			AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
40			} catch (NullPointerException success) {
41			} catch (Exception ex) {
42			unexpectedException();
43			}
44			}
45
46			/**
47			* constructor with array is of same size and has all elements
48			*/
49			public void testConstructor2() {
50			Integer[] a = { two, one, three, four, seven};
51			AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
52			assertEquals(a.length, ai.length());
53	jsr166	1.11	for (int i = 0; i < a.length; ++i)
54	dl	1.7	assertEquals(a[i], ai.get(i));
55			}
56
57
58			/**
59	dl	1.5	* get and set for out of bound indices throw IndexOutOfBoundsException
60			*/
61			public void testIndexing(){
62			AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
63			try {
64			ai.get(SIZE);
65	jsr166	1.12	} catch (IndexOutOfBoundsException success){
66	dl	1.5	}
67			try {
68			ai.get(-1);
69	jsr166	1.12	} catch (IndexOutOfBoundsException success){
70	dl	1.5	}
71			try {
72			ai.set(SIZE, null);
73	jsr166	1.12	} catch (IndexOutOfBoundsException success){
74	dl	1.5	}
75			try {
76			ai.set(-1, null);
77	jsr166	1.12	} catch (IndexOutOfBoundsException success){
78	dl	1.5	}
79			}
80
81			/**
82			* get returns the last value set at index
83	dl	1.4	*/
84	dl	1.1	public void testGetSet(){
85	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
86	dl	1.3	for (int i = 0; i < SIZE; ++i) {
87	dl	1.1	ai.set(i, one);
88			assertEquals(one,ai.get(i));
89			ai.set(i, two);
90			assertEquals(two,ai.get(i));
91			ai.set(i, m3);
92			assertEquals(m3,ai.get(i));
93			}
94			}
95
96	dl	1.4	/**
97	dl	1.10	* get returns the last value lazySet at index by same thread
98			*/
99			public void testGetLazySet(){
100	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
101	dl	1.10	for (int i = 0; i < SIZE; ++i) {
102			ai.lazySet(i, one);
103			assertEquals(one,ai.get(i));
104			ai.lazySet(i, two);
105			assertEquals(two,ai.get(i));
106			ai.lazySet(i, m3);
107			assertEquals(m3,ai.get(i));
108			}
109			}
110
111			/**
112	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
113	dl	1.4	*/
114	dl	1.1	public void testCompareAndSet(){
115	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
116	dl	1.3	for (int i = 0; i < SIZE; ++i) {
117	dl	1.1	ai.set(i, one);
118			assertTrue(ai.compareAndSet(i, one,two));
119			assertTrue(ai.compareAndSet(i, two,m4));
120			assertEquals(m4,ai.get(i));
121			assertFalse(ai.compareAndSet(i, m5,seven));
122			assertFalse((seven.equals(ai.get(i))));
123			assertTrue(ai.compareAndSet(i, m4,seven));
124			assertEquals(seven,ai.get(i));
125			}
126			}
127
128	dl	1.4	/**
129	dl	1.5	* compareAndSet in one thread enables another waiting for value
130			* to succeed
131			*/
132			public void testCompareAndSetInMultipleThreads() {
133			final AtomicReferenceArray a = new AtomicReferenceArray(1);
134			a.set(0, one);
135			Thread t = new Thread(new Runnable() {
136			public void run() {
137	jsr166	1.12	while (!a.compareAndSet(0, two, three)) Thread.yield();
138	dl	1.5	}});
139			try {
140			t.start();
141			assertTrue(a.compareAndSet(0, one, two));
142			t.join(LONG_DELAY_MS);
143			assertFalse(t.isAlive());
144			assertEquals(a.get(0), three);
145			}
146	jsr166	1.12	catch (Exception e) {
147	dl	1.5	unexpectedException();
148			}
149			}
150
151			/**
152			* repeated weakCompareAndSet succeeds in changing value when equal
153	jsr166	1.11	* to expected
154	dl	1.4	*/
155	dl	1.1	public void testWeakCompareAndSet(){
156	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
157	dl	1.3	for (int i = 0; i < SIZE; ++i) {
158	dl	1.1	ai.set(i, one);
159	jsr166	1.12	while (!ai.weakCompareAndSet(i, one,two));
160			while (!ai.weakCompareAndSet(i, two,m4));
161	dl	1.1	assertEquals(m4,ai.get(i));
162	jsr166	1.12	while (!ai.weakCompareAndSet(i, m4,seven));
163	dl	1.1	assertEquals(seven,ai.get(i));
164			}
165			}
166
167	dl	1.4	/**
168	dl	1.5	* getAndSet returns previous value and sets to given value at given index
169	dl	1.4	*/
170	dl	1.1	public void testGetAndSet(){
171	jsr166	1.11	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
172	dl	1.3	for (int i = 0; i < SIZE; ++i) {
173	dl	1.1	ai.set(i, one);
174			assertEquals(one,ai.getAndSet(i,zero));
175			assertEquals(0,ai.getAndSet(i,m10));
176			assertEquals(m10,ai.getAndSet(i,one));
177			}
178			}
179
180	dl	1.4	/**
181	dl	1.5	* a deserialized serialized array holds same values
182	dl	1.4	*/
183	dl	1.2	public void testSerialization() {
184	jsr166	1.11	AtomicReferenceArray l = new AtomicReferenceArray(SIZE);
185	dl	1.3	for (int i = 0; i < SIZE; ++i) {
186	dl	1.2	l.set(i, new Integer(-i));
187			}
188
189			try {
190			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
191			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
192			out.writeObject(l);
193			out.close();
194
195			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
196			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
197			AtomicReferenceArray r = (AtomicReferenceArray) in.readObject();
198			assertEquals(l.length(), r.length());
199	dl	1.3	for (int i = 0; i < SIZE; ++i) {
200	dl	1.2	assertEquals(r.get(i), l.get(i));
201			}
202	jsr166	1.12	} catch (Exception e){
203	dl	1.4	unexpectedException();
204	dl	1.2	}
205			}
206	dl	1.1
207	dl	1.8
208	dl	1.9	/**
209			* toString returns current value.
210	jsr166	1.11	*/
211	dl	1.9	public void testToString() {
212			Integer[] a = { two, one, three, four, seven};
213			AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
214			assertEquals(Arrays.toString(a), ai.toString());
215			}
216	dl	1.1	}