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.*;

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));
        }
    }

    /**
     * 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();
        }
    }


}
Revision:	1.8
Committed:	Fri Jan 9 20:07:36 2004 UTC (20 years, 3 months ago) by dl
Branch:	MAIN
Changes since 1.7:	+1 -0 lines
Log Message:	Tests for toString methods
#	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			* 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	1.1
13	dl	1.3	public class AtomicReferenceArrayTest extends JSR166TestCase
14	dl	1.1	{
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	dl	1.4	/**
23	dl	1.5	* constructor creates array of given size with all elements null
24	dl	1.4	*/
25	dl	1.1	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			for (int i = 0; i < a.length; ++i)
53			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			public void testIndexing(){
61			AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
62			try {
63			ai.get(SIZE);
64			} catch(IndexOutOfBoundsException success){
65			}
66			try {
67			ai.get(-1);
68			} catch(IndexOutOfBoundsException success){
69			}
70			try {
71			ai.set(SIZE, null);
72			} catch(IndexOutOfBoundsException success){
73			}
74			try {
75			ai.set(-1, null);
76			} catch(IndexOutOfBoundsException success){
77			}
78			}
79
80			/**
81			* get returns the last value set at index
82	dl	1.4	*/
83	dl	1.1	public void testGetSet(){
84	dl	1.3	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
85			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	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
97	dl	1.4	*/
98	dl	1.1	public void testCompareAndSet(){
99	dl	1.3	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
100			for (int i = 0; i < SIZE; ++i) {
101	dl	1.1	ai.set(i, one);
102			assertTrue(ai.compareAndSet(i, one,two));
103			assertTrue(ai.compareAndSet(i, two,m4));
104			assertEquals(m4,ai.get(i));
105			assertFalse(ai.compareAndSet(i, m5,seven));
106			assertFalse((seven.equals(ai.get(i))));
107			assertTrue(ai.compareAndSet(i, m4,seven));
108			assertEquals(seven,ai.get(i));
109			}
110			}
111
112	dl	1.4	/**
113	dl	1.5	* compareAndSet in one thread enables another waiting for value
114			* to succeed
115			*/
116			public void testCompareAndSetInMultipleThreads() {
117			final AtomicReferenceArray a = new AtomicReferenceArray(1);
118			a.set(0, one);
119			Thread t = new Thread(new Runnable() {
120			public void run() {
121			while(!a.compareAndSet(0, two, three)) Thread.yield();
122			}});
123			try {
124			t.start();
125			assertTrue(a.compareAndSet(0, one, two));
126			t.join(LONG_DELAY_MS);
127			assertFalse(t.isAlive());
128			assertEquals(a.get(0), three);
129			}
130			catch(Exception e) {
131			unexpectedException();
132			}
133			}
134
135			/**
136			* repeated weakCompareAndSet succeeds in changing value when equal
137			* to expected
138	dl	1.4	*/
139	dl	1.1	public void testWeakCompareAndSet(){
140	dl	1.3	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
141			for (int i = 0; i < SIZE; ++i) {
142	dl	1.1	ai.set(i, one);
143			while(!ai.weakCompareAndSet(i, one,two));
144			while(!ai.weakCompareAndSet(i, two,m4));
145			assertEquals(m4,ai.get(i));
146			while(!ai.weakCompareAndSet(i, m4,seven));
147			assertEquals(seven,ai.get(i));
148			}
149			}
150
151	dl	1.4	/**
152	dl	1.5	* getAndSet returns previous value and sets to given value at given index
153	dl	1.4	*/
154	dl	1.1	public void testGetAndSet(){
155	dl	1.3	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
156			for (int i = 0; i < SIZE; ++i) {
157	dl	1.1	ai.set(i, one);
158			assertEquals(one,ai.getAndSet(i,zero));
159			assertEquals(0,ai.getAndSet(i,m10));
160			assertEquals(m10,ai.getAndSet(i,one));
161			}
162			}
163
164	dl	1.4	/**
165	dl	1.5	* a deserialized serialized array holds same values
166	dl	1.4	*/
167	dl	1.2	public void testSerialization() {
168	dl	1.3	AtomicReferenceArray l = new AtomicReferenceArray(SIZE);
169			for (int i = 0; i < SIZE; ++i) {
170	dl	1.2	l.set(i, new Integer(-i));
171			}
172
173			try {
174			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
175			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
176			out.writeObject(l);
177			out.close();
178
179			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
180			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
181			AtomicReferenceArray r = (AtomicReferenceArray) in.readObject();
182			assertEquals(l.length(), r.length());
183	dl	1.3	for (int i = 0; i < SIZE; ++i) {
184	dl	1.2	assertEquals(r.get(i), l.get(i));
185			}
186			} catch(Exception e){
187	dl	1.4	unexpectedException();
188	dl	1.2	}
189			}
190	dl	1.1
191	dl	1.8
192	dl	1.1	}