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Comparing jsr166/src/test/tck/AtomicIntegerTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.14 by jsr166, Mon Nov 16 05:30:07 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.*;
# Line 17 | Line 18 | public class AtomicIntegerTest extends J
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 47 | Line 73 | public class AtomicIntegerTest extends J
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() {
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 >        try {
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 >        catch (Exception e) {
94 >            unexpectedException();
95 >        }
96 >    }
97 >
98 >    /**
99 >     * repeated weakCompareAndSet succeeds in changing value when equal
100 >     * to expected
101 >     */
102 >    public void testWeakCompareAndSet() {
103          AtomicInteger ai = new AtomicInteger(1);
104 <        while(!ai.weakCompareAndSet(1,2));
105 <        while(!ai.weakCompareAndSet(2,-4));
104 >        while (!ai.weakCompareAndSet(1,2));
105 >        while (!ai.weakCompareAndSet(2,-4));
106          assertEquals(-4,ai.get());
107 <        while(!ai.weakCompareAndSet(-4,7));
107 >        while (!ai.weakCompareAndSet(-4,7));
108          assertEquals(7,ai.get());
109      }
110  
111 <    public void testGetAndSet(){
111 >    /**
112 >     * getAndSet returns previous value and sets to given value
113 >     */
114 >    public void testGetAndSet() {
115          AtomicInteger ai = new AtomicInteger(1);
116          assertEquals(1,ai.getAndSet(0));
117          assertEquals(0,ai.getAndSet(-10));
118          assertEquals(-10,ai.getAndSet(1));
119      }
120  
121 <    public void testGetAndAdd(){
121 >    /**
122 >     * getAndAdd returns previous value and adds given value
123 >     */
124 >    public void testGetAndAdd() {
125          AtomicInteger ai = new AtomicInteger(1);
126          assertEquals(1,ai.getAndAdd(2));
127          assertEquals(3,ai.get());
# Line 71 | Line 129 | public class AtomicIntegerTest extends J
129          assertEquals(-1,ai.get());
130      }
131  
132 <    public void testGetAndDecrement(){
132 >    /**
133 >     * getAndDecrement returns previous value and decrements
134 >     */
135 >    public void testGetAndDecrement() {
136          AtomicInteger ai = new AtomicInteger(1);
137          assertEquals(1,ai.getAndDecrement());
138          assertEquals(0,ai.getAndDecrement());
139          assertEquals(-1,ai.getAndDecrement());
140      }
141  
142 <    public void testGetAndIncrement(){
142 >    /**
143 >     * getAndIncrement returns previous value and increments
144 >     */
145 >    public void testGetAndIncrement() {
146          AtomicInteger ai = new AtomicInteger(1);
147          assertEquals(1,ai.getAndIncrement());
148          assertEquals(2,ai.get());
# Line 89 | Line 153 | public class AtomicIntegerTest extends J
153          assertEquals(1,ai.get());
154      }
155  
156 <    public void testAddAndGet(){
156 >    /**
157 >     * addAndGet adds given value to current, and returns current value
158 >     */
159 >    public void testAddAndGet() {
160          AtomicInteger ai = new AtomicInteger(1);
161          assertEquals(3,ai.addAndGet(2));
162          assertEquals(3,ai.get());
# Line 97 | Line 164 | public class AtomicIntegerTest extends J
164          assertEquals(-1,ai.get());
165      }
166  
167 <    public void testDecrementAndGet(){
167 >    /**
168 >     * decrementAndGet decrements and returns current value
169 >     */
170 >    public void testDecrementAndGet() {
171          AtomicInteger ai = new AtomicInteger(1);
172          assertEquals(0,ai.decrementAndGet());
173          assertEquals(-1,ai.decrementAndGet());
# Line 105 | Line 175 | public class AtomicIntegerTest extends J
175          assertEquals(-2,ai.get());
176      }
177  
178 <    public void testIncrementAndGet(){
178 >    /**
179 >     * incrementAndGet increments and returns current value
180 >     */
181 >    public void testIncrementAndGet() {
182          AtomicInteger ai = new AtomicInteger(1);
183          assertEquals(2,ai.incrementAndGet());
184          assertEquals(2,ai.get());
# Line 116 | Line 189 | public class AtomicIntegerTest extends J
189          assertEquals(1,ai.get());
190      }
191  
192 +    /**
193 +     * a deserialized serialized atomic holds same value
194 +     */
195      public void testSerialization() {
196          AtomicInteger l = new AtomicInteger();
197  
# Line 130 | Line 206 | public class AtomicIntegerTest extends J
206              ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
207              AtomicInteger r = (AtomicInteger) in.readObject();
208              assertEquals(l.get(), r.get());
209 <        } catch(Exception e){
210 <            e.printStackTrace();
135 <            fail("unexpected exception");
209 >        } catch (Exception e) {
210 >            unexpectedException();
211          }
212      }
213  
214 +    /**
215 +     * toString returns current value.
216 +     */
217 +    public void testToString() {
218 +        AtomicInteger ai = new AtomicInteger();
219 +        for (int i = -12; i < 6; ++i) {
220 +            ai.set(i);
221 +            assertEquals(ai.toString(), Integer.toString(i));
222 +        }
223 +    }
224 +
225 +    /**
226 +     * intValue returns current value.
227 +     */
228 +    public void testIntValue() {
229 +        AtomicInteger ai = new AtomicInteger();
230 +        for (int i = -12; i < 6; ++i) {
231 +            ai.set(i);
232 +            assertEquals(i, ai.intValue());
233 +        }
234 +    }
235 +
236 +
237 +    /**
238 +     * longValue returns current value.
239 +     */
240 +    public void testLongValue() {
241 +        AtomicInteger ai = new AtomicInteger();
242 +        for (int i = -12; i < 6; ++i) {
243 +            ai.set(i);
244 +            assertEquals((long)i, ai.longValue());
245 +        }
246 +    }
247 +
248 +    /**
249 +     * floatValue returns current value.
250 +     */
251 +    public void testFloatValue() {
252 +        AtomicInteger ai = new AtomicInteger();
253 +        for (int i = -12; i < 6; ++i) {
254 +            ai.set(i);
255 +            assertEquals((float)i, ai.floatValue());
256 +        }
257 +    }
258 +
259 +    /**
260 +     * doubleValue returns current value.
261 +     */
262 +    public void testDoubleValue() {
263 +        AtomicInteger ai = new AtomicInteger();
264 +        for (int i = -12; i < 6; ++i) {
265 +            ai.set(i);
266 +            assertEquals((double)i, ai.doubleValue());
267 +        }
268 +    }
269 +
270 +
271  
272   }

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