test/tck/AtomicLongTest.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 AtomicLongTest extends JSR166TestCase {
    public static void main (String[] args) {
        junit.textui.TestRunner.run (suite());
    }
    public static Test suite() {
        return new TestSuite(AtomicLongTest.class);
    }

    /**
     * constructor initializes to given value
     */
    public void testConstructor(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.get());
    }

    /**
     * default constructed intializes to zero
     */
    public void testConstructor2(){
        AtomicLong ai = new AtomicLong();
        assertEquals(0,ai.get());
    }

    /**
     * get returns the last value set
     */
    public void testGetSet(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.get());
        ai.set(2);
        assertEquals(2,ai.get());
        ai.set(-3);
        assertEquals(-3,ai.get());
        
    }
    /**
     * compareAndSet succeeds in changing value if equal to expected else fails
     */
    public void testCompareAndSet(){
        AtomicLong ai = new AtomicLong(1);
        assertTrue(ai.compareAndSet(1,2));
        assertTrue(ai.compareAndSet(2,-4));
        assertEquals(-4,ai.get());
        assertFalse(ai.compareAndSet(-5,7));
        assertFalse((7 == ai.get()));
        assertTrue(ai.compareAndSet(-4,7));
        assertEquals(7,ai.get());
    }

    /**
     * compareAndSet in one thread enables another waiting for value
     * to succeed
     */
    public void testCompareAndSetInMultipleThreads() {
        final AtomicLong ai = new AtomicLong(1);
        Thread t = new Thread(new Runnable() {
                public void run() {
                    while(!ai.compareAndSet(2, 3)) Thread.yield();
                }});
        try {
            t.start();
            assertTrue(ai.compareAndSet(1, 2));
            t.join(LONG_DELAY_MS);
            assertFalse(t.isAlive());
            assertEquals(ai.get(), 3);
        }
        catch(Exception e) {
            unexpectedException();
        }
    }

    /**
     * repeated weakCompareAndSet succeeds in changing value when equal
     * to expected 
     */
    public void testWeakCompareAndSet(){
        AtomicLong ai = new AtomicLong(1);
        while(!ai.weakCompareAndSet(1,2));
        while(!ai.weakCompareAndSet(2,-4));
        assertEquals(-4,ai.get());
        while(!ai.weakCompareAndSet(-4,7));
        assertEquals(7,ai.get());
    }

    /**
     * getAndSet returns previous value and sets to given value
     */
    public void testGetAndSet(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndSet(0));
        assertEquals(0,ai.getAndSet(-10));
        assertEquals(-10,ai.getAndSet(1));
    }

    /**
     * getAndAdd returns previous value and adds given value
     */
    public void testGetAndAdd(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndAdd(2));
        assertEquals(3,ai.get());
        assertEquals(3,ai.getAndAdd(-4));
        assertEquals(-1,ai.get());
    }

    /**
     * getAndDecrement returns previous value and decrements
     */
    public void testGetAndDecrement(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndDecrement());
        assertEquals(0,ai.getAndDecrement());
        assertEquals(-1,ai.getAndDecrement());
    }

    /**
     * getAndIncrement returns previous value and increments
     */
    public void testGetAndIncrement(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.getAndIncrement());
        assertEquals(2,ai.get());
        ai.set(-2);
        assertEquals(-2,ai.getAndIncrement());
        assertEquals(-1,ai.getAndIncrement());
        assertEquals(0,ai.getAndIncrement());
        assertEquals(1,ai.get());
    }

    /**
     * addAndGet adds given value to current, and returns current value
     */
    public void testAddAndGet(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(3,ai.addAndGet(2));
        assertEquals(3,ai.get());
        assertEquals(-1,ai.addAndGet(-4));
        assertEquals(-1,ai.get());
    }

    /**
     * decrementAndGet decrements and returns current value
     */
    public void testDecrementAndGet(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(0,ai.decrementAndGet());
        assertEquals(-1,ai.decrementAndGet());
        assertEquals(-2,ai.decrementAndGet());
        assertEquals(-2,ai.get());
    }

    /**
     * incrementAndGet increments and returns current value
     */
    public void testIncrementAndGet(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(2,ai.incrementAndGet());
        assertEquals(2,ai.get());
        ai.set(-2);
        assertEquals(-1,ai.incrementAndGet());
        assertEquals(0,ai.incrementAndGet());
        assertEquals(1,ai.incrementAndGet());
        assertEquals(1,ai.get());
    }

    /**
     * a deserialized serialized atomic holds same value
     */
    public void testSerialization() {
        AtomicLong l = new AtomicLong();

        try {
            l.set(-22);
            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));
            AtomicLong r = (AtomicLong) in.readObject();
            assertEquals(l.get(), r.get());
        } catch(Exception e){
            unexpectedException();
        }
    }

}
Revision:	1.6
Committed:	Sat Dec 27 19:26:43 2003 UTC (20 years, 4 months ago) by dl
Branch:	MAIN
Changes since 1.5:	+5 -4 lines
Log Message:	Headers reference Creative Commons
#	Content
1	/*
2	* 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	*/
8
9	import junit.framework.*;
10	import java.util.concurrent.atomic.*;
11	import java.io.*;
12
13	public class AtomicLongTest extends JSR166TestCase {
14	public static void main (String[] args) {
15	junit.textui.TestRunner.run (suite());
16	}
17	public static Test suite() {
18	return new TestSuite(AtomicLongTest.class);
19	}
20
21	/**
22	* constructor initializes to given value
23	*/
24	public void testConstructor(){
25	AtomicLong ai = new AtomicLong(1);
26	assertEquals(1,ai.get());
27	}
28
29	/**
30	* default constructed intializes to zero
31	*/
32	public void testConstructor2(){
33	AtomicLong ai = new AtomicLong();
34	assertEquals(0,ai.get());
35	}
36
37	/**
38	* get returns the last value set
39	*/
40	public void testGetSet(){
41	AtomicLong ai = new AtomicLong(1);
42	assertEquals(1,ai.get());
43	ai.set(2);
44	assertEquals(2,ai.get());
45	ai.set(-3);
46	assertEquals(-3,ai.get());
47
48	}
49	/**
50	* compareAndSet succeeds in changing value if equal to expected else fails
51	*/
52	public void testCompareAndSet(){
53	AtomicLong ai = new AtomicLong(1);
54	assertTrue(ai.compareAndSet(1,2));
55	assertTrue(ai.compareAndSet(2,-4));
56	assertEquals(-4,ai.get());
57	assertFalse(ai.compareAndSet(-5,7));
58	assertFalse((7 == ai.get()));
59	assertTrue(ai.compareAndSet(-4,7));
60	assertEquals(7,ai.get());
61	}
62
63	/**
64	* compareAndSet in one thread enables another waiting for value
65	* to succeed
66	*/
67	public void testCompareAndSetInMultipleThreads() {
68	final AtomicLong ai = new AtomicLong(1);
69	Thread t = new Thread(new Runnable() {
70	public void run() {
71	while(!ai.compareAndSet(2, 3)) Thread.yield();
72	}});
73	try {
74	t.start();
75	assertTrue(ai.compareAndSet(1, 2));
76	t.join(LONG_DELAY_MS);
77	assertFalse(t.isAlive());
78	assertEquals(ai.get(), 3);
79	}
80	catch(Exception e) {
81	unexpectedException();
82	}
83	}
84
85	/**
86	* repeated weakCompareAndSet succeeds in changing value when equal
87	* to expected
88	*/
89	public void testWeakCompareAndSet(){
90	AtomicLong ai = new AtomicLong(1);
91	while(!ai.weakCompareAndSet(1,2));
92	while(!ai.weakCompareAndSet(2,-4));
93	assertEquals(-4,ai.get());
94	while(!ai.weakCompareAndSet(-4,7));
95	assertEquals(7,ai.get());
96	}
97
98	/**
99	* getAndSet returns previous value and sets to given value
100	*/
101	public void testGetAndSet(){
102	AtomicLong ai = new AtomicLong(1);
103	assertEquals(1,ai.getAndSet(0));
104	assertEquals(0,ai.getAndSet(-10));
105	assertEquals(-10,ai.getAndSet(1));
106	}
107
108	/**
109	* getAndAdd returns previous value and adds given value
110	*/
111	public void testGetAndAdd(){
112	AtomicLong ai = new AtomicLong(1);
113	assertEquals(1,ai.getAndAdd(2));
114	assertEquals(3,ai.get());
115	assertEquals(3,ai.getAndAdd(-4));
116	assertEquals(-1,ai.get());
117	}
118
119	/**
120	* getAndDecrement returns previous value and decrements
121	*/
122	public void testGetAndDecrement(){
123	AtomicLong ai = new AtomicLong(1);
124	assertEquals(1,ai.getAndDecrement());
125	assertEquals(0,ai.getAndDecrement());
126	assertEquals(-1,ai.getAndDecrement());
127	}
128
129	/**
130	* getAndIncrement returns previous value and increments
131	*/
132	public void testGetAndIncrement(){
133	AtomicLong ai = new AtomicLong(1);
134	assertEquals(1,ai.getAndIncrement());
135	assertEquals(2,ai.get());
136	ai.set(-2);
137	assertEquals(-2,ai.getAndIncrement());
138	assertEquals(-1,ai.getAndIncrement());
139	assertEquals(0,ai.getAndIncrement());
140	assertEquals(1,ai.get());
141	}
142
143	/**
144	* addAndGet adds given value to current, and returns current value
145	*/
146	public void testAddAndGet(){
147	AtomicLong ai = new AtomicLong(1);
148	assertEquals(3,ai.addAndGet(2));
149	assertEquals(3,ai.get());
150	assertEquals(-1,ai.addAndGet(-4));
151	assertEquals(-1,ai.get());
152	}
153
154	/**
155	* decrementAndGet decrements and returns current value
156	*/
157	public void testDecrementAndGet(){
158	AtomicLong ai = new AtomicLong(1);
159	assertEquals(0,ai.decrementAndGet());
160	assertEquals(-1,ai.decrementAndGet());
161	assertEquals(-2,ai.decrementAndGet());
162	assertEquals(-2,ai.get());
163	}
164
165	/**
166	* incrementAndGet increments and returns current value
167	*/
168	public void testIncrementAndGet(){
169	AtomicLong ai = new AtomicLong(1);
170	assertEquals(2,ai.incrementAndGet());
171	assertEquals(2,ai.get());
172	ai.set(-2);
173	assertEquals(-1,ai.incrementAndGet());
174	assertEquals(0,ai.incrementAndGet());
175	assertEquals(1,ai.incrementAndGet());
176	assertEquals(1,ai.get());
177	}
178
179	/**
180	* a deserialized serialized atomic holds same value
181	*/
182	public void testSerialization() {
183	AtomicLong l = new AtomicLong();
184
185	try {
186	l.set(-22);
187	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	AtomicLong r = (AtomicLong) in.readObject();
195	assertEquals(l.get(), r.get());
196	} catch(Exception e){
197	unexpectedException();
198	}
199	}
200
201	}