test/tck/AtomicLongTest.java

/*
 * Written by members of JCP JSR-166 Expert Group and released to the
 * public domain. Use, modify, and redistribute this code in any way
 * without acknowledgement. Other contributors include Andrew Wright,
 * Jeffrey Hayes, Pat Fischer, 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:	1.5
Committed:	Thu Sep 25 11:02:41 2003 UTC (20 years, 7 months ago) by dl
Branch:	MAIN
CVS Tags:	JSR166_NOV3_FREEZE, JSR166_DEC9_PRE_ES_SUBMIT, JSR166_DEC9_POST_ES_SUBMIT
Changes since 1.4:	+36 -13 lines
Log Message:	improve tck javadocs; rename and add a few tests
#	User	Rev	Content
1	dl	1.1	/*
2			* Written by members of JCP JSR-166 Expert Group and released to the
3			* public domain. Use, modify, and redistribute this code in any way
4			* without acknowledgement. Other contributors include Andrew Wright,
5			* Jeffrey Hayes, Pat Fischer, Mike Judd.
6			*/
7
8			import junit.framework.*;
9			import java.util.concurrent.atomic.*;
10	dl	1.2	import java.io.*;
11	dl	1.1
12	dl	1.3	public class AtomicLongTest extends JSR166TestCase {
13	dl	1.1	public static void main (String[] args) {
14			junit.textui.TestRunner.run (suite());
15			}
16			public static Test suite() {
17			return new TestSuite(AtomicLongTest.class);
18			}
19
20	dl	1.4	/**
21	dl	1.5	* constructor initializes to given value
22	dl	1.4	*/
23	dl	1.1	public void testConstructor(){
24			AtomicLong ai = new AtomicLong(1);
25			assertEquals(1,ai.get());
26			}
27
28	dl	1.4	/**
29	dl	1.5	* default constructed intializes to zero
30	dl	1.4	*/
31	dl	1.1	public void testConstructor2(){
32			AtomicLong ai = new AtomicLong();
33			assertEquals(0,ai.get());
34			}
35
36	dl	1.4	/**
37	dl	1.5	* get returns the last value set
38	dl	1.4	*/
39	dl	1.1	public void testGetSet(){
40			AtomicLong ai = new AtomicLong(1);
41			assertEquals(1,ai.get());
42			ai.set(2);
43			assertEquals(2,ai.get());
44			ai.set(-3);
45			assertEquals(-3,ai.get());
46
47			}
48	dl	1.4	/**
49	dl	1.5	* compareAndSet succeeds in changing value if equal to expected else fails
50	dl	1.4	*/
51	dl	1.1	public void testCompareAndSet(){
52			AtomicLong ai = new AtomicLong(1);
53			assertTrue(ai.compareAndSet(1,2));
54			assertTrue(ai.compareAndSet(2,-4));
55			assertEquals(-4,ai.get());
56			assertFalse(ai.compareAndSet(-5,7));
57			assertFalse((7 == ai.get()));
58			assertTrue(ai.compareAndSet(-4,7));
59			assertEquals(7,ai.get());
60			}
61
62	dl	1.4	/**
63	dl	1.5	* compareAndSet in one thread enables another waiting for value
64			* to succeed
65			*/
66			public void testCompareAndSetInMultipleThreads() {
67			final AtomicLong ai = new AtomicLong(1);
68			Thread t = new Thread(new Runnable() {
69			public void run() {
70			while(!ai.compareAndSet(2, 3)) Thread.yield();
71			}});
72			try {
73			t.start();
74			assertTrue(ai.compareAndSet(1, 2));
75			t.join(LONG_DELAY_MS);
76			assertFalse(t.isAlive());
77			assertEquals(ai.get(), 3);
78			}
79			catch(Exception e) {
80			unexpectedException();
81			}
82			}
83
84			/**
85			* repeated weakCompareAndSet succeeds in changing value when equal
86			* to expected
87	dl	1.4	*/
88	dl	1.1	public void testWeakCompareAndSet(){
89			AtomicLong ai = new AtomicLong(1);
90			while(!ai.weakCompareAndSet(1,2));
91			while(!ai.weakCompareAndSet(2,-4));
92			assertEquals(-4,ai.get());
93			while(!ai.weakCompareAndSet(-4,7));
94			assertEquals(7,ai.get());
95			}
96
97	dl	1.4	/**
98	dl	1.5	* getAndSet returns previous value and sets to given value
99	dl	1.4	*/
100	dl	1.1	public void testGetAndSet(){
101			AtomicLong ai = new AtomicLong(1);
102			assertEquals(1,ai.getAndSet(0));
103			assertEquals(0,ai.getAndSet(-10));
104			assertEquals(-10,ai.getAndSet(1));
105			}
106
107	dl	1.4	/**
108	dl	1.5	* getAndAdd returns previous value and adds given value
109	dl	1.4	*/
110	dl	1.1	public void testGetAndAdd(){
111			AtomicLong ai = new AtomicLong(1);
112			assertEquals(1,ai.getAndAdd(2));
113			assertEquals(3,ai.get());
114			assertEquals(3,ai.getAndAdd(-4));
115			assertEquals(-1,ai.get());
116			}
117
118	dl	1.4	/**
119	dl	1.5	* getAndDecrement returns previous value and decrements
120	dl	1.4	*/
121	dl	1.1	public void testGetAndDecrement(){
122			AtomicLong ai = new AtomicLong(1);
123			assertEquals(1,ai.getAndDecrement());
124			assertEquals(0,ai.getAndDecrement());
125			assertEquals(-1,ai.getAndDecrement());
126			}
127
128	dl	1.4	/**
129	dl	1.5	* getAndIncrement returns previous value and increments
130	dl	1.4	*/
131	dl	1.1	public void testGetAndIncrement(){
132			AtomicLong ai = new AtomicLong(1);
133			assertEquals(1,ai.getAndIncrement());
134			assertEquals(2,ai.get());
135			ai.set(-2);
136			assertEquals(-2,ai.getAndIncrement());
137			assertEquals(-1,ai.getAndIncrement());
138			assertEquals(0,ai.getAndIncrement());
139			assertEquals(1,ai.get());
140			}
141
142	dl	1.4	/**
143	dl	1.5	* addAndGet adds given value to current, and returns current value
144	dl	1.4	*/
145	dl	1.1	public void testAddAndGet(){
146			AtomicLong ai = new AtomicLong(1);
147			assertEquals(3,ai.addAndGet(2));
148			assertEquals(3,ai.get());
149			assertEquals(-1,ai.addAndGet(-4));
150			assertEquals(-1,ai.get());
151			}
152
153	dl	1.4	/**
154	dl	1.5	* decrementAndGet decrements and returns current value
155	dl	1.4	*/
156	dl	1.1	public void testDecrementAndGet(){
157			AtomicLong ai = new AtomicLong(1);
158			assertEquals(0,ai.decrementAndGet());
159			assertEquals(-1,ai.decrementAndGet());
160			assertEquals(-2,ai.decrementAndGet());
161			assertEquals(-2,ai.get());
162			}
163
164	dl	1.4	/**
165	dl	1.5	* incrementAndGet increments and returns current value
166	dl	1.4	*/
167	dl	1.1	public void testIncrementAndGet(){
168			AtomicLong ai = new AtomicLong(1);
169			assertEquals(2,ai.incrementAndGet());
170			assertEquals(2,ai.get());
171			ai.set(-2);
172			assertEquals(-1,ai.incrementAndGet());
173			assertEquals(0,ai.incrementAndGet());
174			assertEquals(1,ai.incrementAndGet());
175			assertEquals(1,ai.get());
176			}
177
178	dl	1.4	/**
179	dl	1.5	* a deserialized serialized atomic holds same value
180	dl	1.4	*/
181	dl	1.2	public void testSerialization() {
182			AtomicLong l = new AtomicLong();
183
184			try {
185			l.set(-22);
186			ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
187			ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
188			out.writeObject(l);
189			out.close();
190
191			ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
192			ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
193			AtomicLong r = (AtomicLong) in.readObject();
194			assertEquals(l.get(), r.get());
195			} catch(Exception e){
196	dl	1.4	unexpectedException();
197	dl	1.2	}
198			}
199	dl	1.1
200			}