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Comparing jsr166/src/test/tck/AtomicIntegerTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:53 2003 UTC vs.
Revision 1.15 by jsr166, Tue Nov 17 03:12:51 2009 UTC

# Line 1 | Line 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.
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 AtomicIntegerTest extends TestCase {
13 > public class AtomicIntegerTest extends JSR166TestCase {
14      public static void main (String[] args) {
15          junit.textui.TestRunner.run (suite());
16      }
# Line 16 | Line 18 | public class AtomicIntegerTest extends T
18          return new TestSuite(AtomicIntegerTest.class);
19      }
20  
21 <    public void testConstructor(){
21 >    /**
22 >     * constructor initializes to given value
23 >     */
24 >    public void testConstructor() {
25          AtomicInteger ai = new AtomicInteger(1);
26          assertEquals(1,ai.get());
27      }
28  
29 <    public void testConstructor2(){
29 >    /**
30 >     * default constructed initializes to zero
31 >     */
32 >    public void testConstructor2() {
33          AtomicInteger ai = new AtomicInteger();
34          assertEquals(0,ai.get());
35      }
36  
37 <    public void testGetSet(){
37 >    /**
38 >     * get returns the last value set
39 >     */
40 >    public void testGetSet() {
41          AtomicInteger ai = new AtomicInteger(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 <        
47 >
48      }
49 <    public void testCompareAndSet(){
49 >
50 >    /**
51 >     * get returns the last value lazySet in same thread
52 >     */
53 >    public void testGetLazySet() {
54 >        AtomicInteger ai = new AtomicInteger(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 >     * compareAndSet succeeds in changing value if equal to expected else fails
64 >     */
65 >    public void testCompareAndSet() {
66          AtomicInteger ai = new AtomicInteger(1);
67          assertTrue(ai.compareAndSet(1,2));
68          assertTrue(ai.compareAndSet(2,-4));
# Line 46 | Line 73 | public class AtomicIntegerTest extends T
73          assertEquals(7,ai.get());
74      }
75  
76 <    public void testWeakCompareAndSet(){
76 >    /**
77 >     * compareAndSet in one thread enables another waiting for value
78 >     * to succeed
79 >     */
80 >    public void testCompareAndSetInMultipleThreads() throws Exception {
81 >        final AtomicInteger ai = new AtomicInteger(1);
82 >        Thread t = new Thread(new Runnable() {
83 >                public void run() {
84 >                    while (!ai.compareAndSet(2, 3)) Thread.yield();
85 >                }});
86 >
87 >        t.start();
88 >        assertTrue(ai.compareAndSet(1, 2));
89 >        t.join(LONG_DELAY_MS);
90 >        assertFalse(t.isAlive());
91 >        assertEquals(ai.get(), 3);
92 >    }
93 >
94 >    /**
95 >     * repeated weakCompareAndSet succeeds in changing value when equal
96 >     * to expected
97 >     */
98 >    public void testWeakCompareAndSet() {
99          AtomicInteger ai = new AtomicInteger(1);
100 <        while(!ai.weakCompareAndSet(1,2));
101 <        while(!ai.weakCompareAndSet(2,-4));
100 >        while (!ai.weakCompareAndSet(1,2));
101 >        while (!ai.weakCompareAndSet(2,-4));
102          assertEquals(-4,ai.get());
103 <        while(!ai.weakCompareAndSet(-4,7));
103 >        while (!ai.weakCompareAndSet(-4,7));
104          assertEquals(7,ai.get());
105      }
106  
107 <    public void testGetAndSet(){
107 >    /**
108 >     * getAndSet returns previous value and sets to given value
109 >     */
110 >    public void testGetAndSet() {
111          AtomicInteger ai = new AtomicInteger(1);
112          assertEquals(1,ai.getAndSet(0));
113          assertEquals(0,ai.getAndSet(-10));
114          assertEquals(-10,ai.getAndSet(1));
115      }
116  
117 <    public void testGetAndAdd(){
117 >    /**
118 >     * getAndAdd returns previous value and adds given value
119 >     */
120 >    public void testGetAndAdd() {
121          AtomicInteger ai = new AtomicInteger(1);
122          assertEquals(1,ai.getAndAdd(2));
123          assertEquals(3,ai.get());
# Line 70 | Line 125 | public class AtomicIntegerTest extends T
125          assertEquals(-1,ai.get());
126      }
127  
128 <    public void testGetAndDecrement(){
128 >    /**
129 >     * getAndDecrement returns previous value and decrements
130 >     */
131 >    public void testGetAndDecrement() {
132          AtomicInteger ai = new AtomicInteger(1);
133          assertEquals(1,ai.getAndDecrement());
134          assertEquals(0,ai.getAndDecrement());
135          assertEquals(-1,ai.getAndDecrement());
136      }
137  
138 <    public void testGetAndIncrement(){
138 >    /**
139 >     * getAndIncrement returns previous value and increments
140 >     */
141 >    public void testGetAndIncrement() {
142          AtomicInteger ai = new AtomicInteger(1);
143          assertEquals(1,ai.getAndIncrement());
144          assertEquals(2,ai.get());
# Line 88 | Line 149 | public class AtomicIntegerTest extends T
149          assertEquals(1,ai.get());
150      }
151  
152 <    public void testAddAndGet(){
152 >    /**
153 >     * addAndGet adds given value to current, and returns current value
154 >     */
155 >    public void testAddAndGet() {
156          AtomicInteger ai = new AtomicInteger(1);
157          assertEquals(3,ai.addAndGet(2));
158          assertEquals(3,ai.get());
# Line 96 | Line 160 | public class AtomicIntegerTest extends T
160          assertEquals(-1,ai.get());
161      }
162  
163 <    public void testDecrementAndGet(){
163 >    /**
164 >     * decrementAndGet decrements and returns current value
165 >     */
166 >    public void testDecrementAndGet() {
167          AtomicInteger ai = new AtomicInteger(1);
168          assertEquals(0,ai.decrementAndGet());
169          assertEquals(-1,ai.decrementAndGet());
# Line 104 | Line 171 | public class AtomicIntegerTest extends T
171          assertEquals(-2,ai.get());
172      }
173  
174 <    public void testIncrementAndGet(){
174 >    /**
175 >     * incrementAndGet increments and returns current value
176 >     */
177 >    public void testIncrementAndGet() {
178          AtomicInteger ai = new AtomicInteger(1);
179          assertEquals(2,ai.incrementAndGet());
180          assertEquals(2,ai.get());
# Line 115 | Line 185 | public class AtomicIntegerTest extends T
185          assertEquals(1,ai.get());
186      }
187  
188 +    /**
189 +     * a deserialized serialized atomic holds same value
190 +     */
191 +    public void testSerialization() throws Exception {
192 +        AtomicInteger l = new AtomicInteger();
193 +
194 +        l.set(22);
195 +        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
196 +        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
197 +        out.writeObject(l);
198 +        out.close();
199 +
200 +        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
201 +        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
202 +        AtomicInteger r = (AtomicInteger) in.readObject();
203 +        assertEquals(l.get(), r.get());
204 +    }
205 +
206 +    /**
207 +     * toString returns current value.
208 +     */
209 +    public void testToString() {
210 +        AtomicInteger ai = new AtomicInteger();
211 +        for (int i = -12; i < 6; ++i) {
212 +            ai.set(i);
213 +            assertEquals(ai.toString(), Integer.toString(i));
214 +        }
215 +    }
216 +
217 +    /**
218 +     * intValue returns current value.
219 +     */
220 +    public void testIntValue() {
221 +        AtomicInteger ai = new AtomicInteger();
222 +        for (int i = -12; i < 6; ++i) {
223 +            ai.set(i);
224 +            assertEquals(i, ai.intValue());
225 +        }
226 +    }
227 +
228 +
229 +    /**
230 +     * longValue returns current value.
231 +     */
232 +    public void testLongValue() {
233 +        AtomicInteger ai = new AtomicInteger();
234 +        for (int i = -12; i < 6; ++i) {
235 +            ai.set(i);
236 +            assertEquals((long)i, ai.longValue());
237 +        }
238 +    }
239 +
240 +    /**
241 +     * floatValue returns current value.
242 +     */
243 +    public void testFloatValue() {
244 +        AtomicInteger ai = new AtomicInteger();
245 +        for (int i = -12; i < 6; ++i) {
246 +            ai.set(i);
247 +            assertEquals((float)i, ai.floatValue());
248 +        }
249 +    }
250 +
251 +    /**
252 +     * doubleValue returns current value.
253 +     */
254 +    public void testDoubleValue() {
255 +        AtomicInteger ai = new AtomicInteger();
256 +        for (int i = -12; i < 6; ++i) {
257 +            ai.set(i);
258 +            assertEquals((double)i, ai.doubleValue());
259 +        }
260 +    }
261 +
262 +
263  
264   }

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