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 initializes 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());
        
    }

    /**
     * get returns the last value lazySet in same thread
     */
    public void testGetLazySet(){
        AtomicLong ai = new AtomicLong(1);
        assertEquals(1,ai.get());
        ai.lazySet(2);
        assertEquals(2,ai.get());
        ai.lazySet(-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();
        }
    }

    /**
     * toString returns current value.
     */ 
    public void testToString() {
        AtomicLong ai = new AtomicLong();
        for (long i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals(ai.toString(), Long.toString(i));
        }
    }

    /**
     * longValue returns current value.
     */ 
    public void testLongValue() {
        AtomicLong ai = new AtomicLong();
        for (int i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals((long)i, ai.longValue());
        }
    }

    /**
     * floatValue returns current value.
     */ 
    public void testFloatValue() {
        AtomicLong ai = new AtomicLong();
        for (int i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals((float)i, ai.floatValue());
        }
    }

    /**
     * doubleValue returns current value.
     */ 
    public void testDoubleValue() {
        AtomicLong ai = new AtomicLong();
        for (int i = -12; i < 6; ++i) {
            ai.set(i);
            assertEquals((double)i, ai.doubleValue());
        }
    }


}
Revision:	1.10
Committed:	Wed May 25 14:27:37 2005 UTC (18 years, 11 months ago) by dl
Branch:	MAIN
Changes since 1.9:	+14 -0 lines
Log Message:	Add tests for AtomicX.lazySet
#	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 initializes 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	/**
51	* get returns the last value lazySet in same thread
52	*/
53	public void testGetLazySet(){
54	AtomicLong ai = new AtomicLong(1);
55	assertEquals(1,ai.get());
56	ai.lazySet(2);
57	assertEquals(2,ai.get());
58	ai.lazySet(-3);
59	assertEquals(-3,ai.get());
60
61	}
62
63	/**
64	* compareAndSet succeeds in changing value if equal to expected else fails
65	*/
66	public void testCompareAndSet(){
67	AtomicLong ai = new AtomicLong(1);
68	assertTrue(ai.compareAndSet(1,2));
69	assertTrue(ai.compareAndSet(2,-4));
70	assertEquals(-4,ai.get());
71	assertFalse(ai.compareAndSet(-5,7));
72	assertFalse((7 == ai.get()));
73	assertTrue(ai.compareAndSet(-4,7));
74	assertEquals(7,ai.get());
75	}
76
77	/**
78	* compareAndSet in one thread enables another waiting for value
79	* to succeed
80	*/
81	public void testCompareAndSetInMultipleThreads() {
82	final AtomicLong ai = new AtomicLong(1);
83	Thread t = new Thread(new Runnable() {
84	public void run() {
85	while(!ai.compareAndSet(2, 3)) Thread.yield();
86	}});
87	try {
88	t.start();
89	assertTrue(ai.compareAndSet(1, 2));
90	t.join(LONG_DELAY_MS);
91	assertFalse(t.isAlive());
92	assertEquals(ai.get(), 3);
93	}
94	catch(Exception e) {
95	unexpectedException();
96	}
97	}
98
99	/**
100	* repeated weakCompareAndSet succeeds in changing value when equal
101	* to expected
102	*/
103	public void testWeakCompareAndSet(){
104	AtomicLong ai = new AtomicLong(1);
105	while(!ai.weakCompareAndSet(1,2));
106	while(!ai.weakCompareAndSet(2,-4));
107	assertEquals(-4,ai.get());
108	while(!ai.weakCompareAndSet(-4,7));
109	assertEquals(7,ai.get());
110	}
111
112	/**
113	* getAndSet returns previous value and sets to given value
114	*/
115	public void testGetAndSet(){
116	AtomicLong ai = new AtomicLong(1);
117	assertEquals(1,ai.getAndSet(0));
118	assertEquals(0,ai.getAndSet(-10));
119	assertEquals(-10,ai.getAndSet(1));
120	}
121
122	/**
123	* getAndAdd returns previous value and adds given value
124	*/
125	public void testGetAndAdd(){
126	AtomicLong ai = new AtomicLong(1);
127	assertEquals(1,ai.getAndAdd(2));
128	assertEquals(3,ai.get());
129	assertEquals(3,ai.getAndAdd(-4));
130	assertEquals(-1,ai.get());
131	}
132
133	/**
134	* getAndDecrement returns previous value and decrements
135	*/
136	public void testGetAndDecrement(){
137	AtomicLong ai = new AtomicLong(1);
138	assertEquals(1,ai.getAndDecrement());
139	assertEquals(0,ai.getAndDecrement());
140	assertEquals(-1,ai.getAndDecrement());
141	}
142
143	/**
144	* getAndIncrement returns previous value and increments
145	*/
146	public void testGetAndIncrement(){
147	AtomicLong ai = new AtomicLong(1);
148	assertEquals(1,ai.getAndIncrement());
149	assertEquals(2,ai.get());
150	ai.set(-2);
151	assertEquals(-2,ai.getAndIncrement());
152	assertEquals(-1,ai.getAndIncrement());
153	assertEquals(0,ai.getAndIncrement());
154	assertEquals(1,ai.get());
155	}
156
157	/**
158	* addAndGet adds given value to current, and returns current value
159	*/
160	public void testAddAndGet(){
161	AtomicLong ai = new AtomicLong(1);
162	assertEquals(3,ai.addAndGet(2));
163	assertEquals(3,ai.get());
164	assertEquals(-1,ai.addAndGet(-4));
165	assertEquals(-1,ai.get());
166	}
167
168	/**
169	* decrementAndGet decrements and returns current value
170	*/
171	public void testDecrementAndGet(){
172	AtomicLong ai = new AtomicLong(1);
173	assertEquals(0,ai.decrementAndGet());
174	assertEquals(-1,ai.decrementAndGet());
175	assertEquals(-2,ai.decrementAndGet());
176	assertEquals(-2,ai.get());
177	}
178
179	/**
180	* incrementAndGet increments and returns current value
181	*/
182	public void testIncrementAndGet(){
183	AtomicLong ai = new AtomicLong(1);
184	assertEquals(2,ai.incrementAndGet());
185	assertEquals(2,ai.get());
186	ai.set(-2);
187	assertEquals(-1,ai.incrementAndGet());
188	assertEquals(0,ai.incrementAndGet());
189	assertEquals(1,ai.incrementAndGet());
190	assertEquals(1,ai.get());
191	}
192
193	/**
194	* a deserialized serialized atomic holds same value
195	*/
196	public void testSerialization() {
197	AtomicLong l = new AtomicLong();
198
199	try {
200	l.set(-22);
201	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
202	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
203	out.writeObject(l);
204	out.close();
205
206	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
207	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
208	AtomicLong r = (AtomicLong) in.readObject();
209	assertEquals(l.get(), r.get());
210	} catch(Exception e){
211	unexpectedException();
212	}
213	}
214
215	/**
216	* toString returns current value.
217	*/
218	public void testToString() {
219	AtomicLong ai = new AtomicLong();
220	for (long i = -12; i < 6; ++i) {
221	ai.set(i);
222	assertEquals(ai.toString(), Long.toString(i));
223	}
224	}
225
226	/**
227	* longValue returns current value.
228	*/
229	public void testLongValue() {
230	AtomicLong ai = new AtomicLong();
231	for (int i = -12; i < 6; ++i) {
232	ai.set(i);
233	assertEquals((long)i, ai.longValue());
234	}
235	}
236
237	/**
238	* floatValue returns current value.
239	*/
240	public void testFloatValue() {
241	AtomicLong ai = new AtomicLong();
242	for (int i = -12; i < 6; ++i) {
243	ai.set(i);
244	assertEquals((float)i, ai.floatValue());
245	}
246	}
247
248	/**
249	* doubleValue returns current value.
250	*/
251	public void testDoubleValue() {
252	AtomicLong ai = new AtomicLong();
253	for (int i = -12; i < 6; ++i) {
254	ai.set(i);
255	assertEquals((double)i, ai.doubleValue());
256	}
257	}
258
259
260	}