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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 1.16 by jsr166, Tue Nov 17 06:58:50 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 >
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 <    public void testCompareAndSet(){
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() throws Exception {
81 >        final AtomicInteger ai = new AtomicInteger(1);
82 >        Thread t = new Thread(new CheckedRunnable() {
83 >            public void realRun() {
84 >                while (!ai.compareAndSet(2, 3))
85 >                    Thread.yield();
86 >            }});
87 >
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 >
95 >    /**
96 >     * repeated weakCompareAndSet succeeds in changing value when equal
97 >     * to expected
98 >     */
99 >    public void testWeakCompareAndSet() {
100          AtomicInteger ai = new AtomicInteger(1);
101 <        while(!ai.weakCompareAndSet(1,2));
102 <        while(!ai.weakCompareAndSet(2,-4));
101 >        while (!ai.weakCompareAndSet(1,2));
102 >        while (!ai.weakCompareAndSet(2,-4));
103          assertEquals(-4,ai.get());
104 <        while(!ai.weakCompareAndSet(-4,7));
104 >        while (!ai.weakCompareAndSet(-4,7));
105          assertEquals(7,ai.get());
106      }
107  
108 <    public void testGetAndSet(){
108 >    /**
109 >     * getAndSet returns previous value and sets to given value
110 >     */
111 >    public void testGetAndSet() {
112          AtomicInteger ai = new AtomicInteger(1);
113          assertEquals(1,ai.getAndSet(0));
114          assertEquals(0,ai.getAndSet(-10));
115          assertEquals(-10,ai.getAndSet(1));
116      }
117  
118 <    public void testGetAndAdd(){
118 >    /**
119 >     * getAndAdd returns previous value and adds given value
120 >     */
121 >    public void testGetAndAdd() {
122          AtomicInteger ai = new AtomicInteger(1);
123          assertEquals(1,ai.getAndAdd(2));
124          assertEquals(3,ai.get());
# Line 71 | Line 126 | public class AtomicIntegerTest extends J
126          assertEquals(-1,ai.get());
127      }
128  
129 <    public void testGetAndDecrement(){
129 >    /**
130 >     * getAndDecrement returns previous value and decrements
131 >     */
132 >    public void testGetAndDecrement() {
133          AtomicInteger ai = new AtomicInteger(1);
134          assertEquals(1,ai.getAndDecrement());
135          assertEquals(0,ai.getAndDecrement());
136          assertEquals(-1,ai.getAndDecrement());
137      }
138  
139 <    public void testGetAndIncrement(){
139 >    /**
140 >     * getAndIncrement returns previous value and increments
141 >     */
142 >    public void testGetAndIncrement() {
143          AtomicInteger ai = new AtomicInteger(1);
144          assertEquals(1,ai.getAndIncrement());
145          assertEquals(2,ai.get());
# Line 89 | Line 150 | public class AtomicIntegerTest extends J
150          assertEquals(1,ai.get());
151      }
152  
153 <    public void testAddAndGet(){
153 >    /**
154 >     * addAndGet adds given value to current, and returns current value
155 >     */
156 >    public void testAddAndGet() {
157          AtomicInteger ai = new AtomicInteger(1);
158          assertEquals(3,ai.addAndGet(2));
159          assertEquals(3,ai.get());
# Line 97 | Line 161 | public class AtomicIntegerTest extends J
161          assertEquals(-1,ai.get());
162      }
163  
164 <    public void testDecrementAndGet(){
164 >    /**
165 >     * decrementAndGet decrements and returns current value
166 >     */
167 >    public void testDecrementAndGet() {
168          AtomicInteger ai = new AtomicInteger(1);
169          assertEquals(0,ai.decrementAndGet());
170          assertEquals(-1,ai.decrementAndGet());
# Line 105 | Line 172 | public class AtomicIntegerTest extends J
172          assertEquals(-2,ai.get());
173      }
174  
175 <    public void testIncrementAndGet(){
175 >    /**
176 >     * incrementAndGet increments and returns current value
177 >     */
178 >    public void testIncrementAndGet() {
179          AtomicInteger ai = new AtomicInteger(1);
180          assertEquals(2,ai.incrementAndGet());
181          assertEquals(2,ai.get());
# Line 116 | Line 186 | public class AtomicIntegerTest extends J
186          assertEquals(1,ai.get());
187      }
188  
189 <    public void testSerialization() {
189 >    /**
190 >     * a deserialized serialized atomic holds same value
191 >     */
192 >    public void testSerialization() throws Exception {
193          AtomicInteger l = new AtomicInteger();
194  
195 <        try {
196 <            l.set(22);
197 <            ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
198 <            ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
199 <            out.writeObject(l);
200 <            out.close();
201 <
202 <            ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
203 <            ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
204 <            AtomicInteger r = (AtomicInteger) in.readObject();
205 <            assertEquals(l.get(), r.get());
206 <        } catch(Exception e){
207 <            e.printStackTrace();
208 <            fail("unexpected exception");
195 >        l.set(22);
196 >        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
197 >        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
198 >        out.writeObject(l);
199 >        out.close();
200 >
201 >        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
202 >        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
203 >        AtomicInteger r = (AtomicInteger) in.readObject();
204 >        assertEquals(l.get(), r.get());
205 >    }
206 >
207 >    /**
208 >     * toString returns current value.
209 >     */
210 >    public void testToString() {
211 >        AtomicInteger ai = new AtomicInteger();
212 >        for (int i = -12; i < 6; ++i) {
213 >            ai.set(i);
214 >            assertEquals(ai.toString(), Integer.toString(i));
215          }
216      }
217  
218 +    /**
219 +     * intValue returns current value.
220 +     */
221 +    public void testIntValue() {
222 +        AtomicInteger ai = new AtomicInteger();
223 +        for (int i = -12; i < 6; ++i) {
224 +            ai.set(i);
225 +            assertEquals(i, ai.intValue());
226 +        }
227 +    }
228 +
229 +
230 +    /**
231 +     * longValue returns current value.
232 +     */
233 +    public void testLongValue() {
234 +        AtomicInteger ai = new AtomicInteger();
235 +        for (int i = -12; i < 6; ++i) {
236 +            ai.set(i);
237 +            assertEquals((long)i, ai.longValue());
238 +        }
239 +    }
240 +
241 +    /**
242 +     * floatValue returns current value.
243 +     */
244 +    public void testFloatValue() {
245 +        AtomicInteger ai = new AtomicInteger();
246 +        for (int i = -12; i < 6; ++i) {
247 +            ai.set(i);
248 +            assertEquals((float)i, ai.floatValue());
249 +        }
250 +    }
251 +
252 +    /**
253 +     * doubleValue returns current value.
254 +     */
255 +    public void testDoubleValue() {
256 +        AtomicInteger ai = new AtomicInteger();
257 +        for (int i = -12; i < 6; ++i) {
258 +            ai.set(i);
259 +            assertEquals((double)i, ai.doubleValue());
260 +        }
261 +    }
262 +
263 +
264  
265   }

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