1 |
dl |
1.1 |
/* |
2 |
dl |
1.6 |
* 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 |
dl |
1.1 |
*/ |
8 |
|
|
|
9 |
|
|
import junit.framework.*; |
10 |
|
|
import java.util.concurrent.atomic.*; |
11 |
dl |
1.2 |
import java.io.*; |
12 |
dl |
1.1 |
|
13 |
dl |
1.3 |
public class AtomicIntegerTest extends JSR166TestCase { |
14 |
dl |
1.1 |
public static void main (String[] args) { |
15 |
|
|
junit.textui.TestRunner.run (suite()); |
16 |
|
|
} |
17 |
|
|
public static Test suite() { |
18 |
|
|
return new TestSuite(AtomicIntegerTest.class); |
19 |
|
|
} |
20 |
|
|
|
21 |
dl |
1.4 |
/** |
22 |
dl |
1.5 |
* constructor initializes to given value |
23 |
dl |
1.4 |
*/ |
24 |
dl |
1.1 |
public void testConstructor(){ |
25 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
26 |
|
|
assertEquals(1,ai.get()); |
27 |
|
|
} |
28 |
|
|
|
29 |
dl |
1.4 |
/** |
30 |
dl |
1.7 |
* default constructed initializes to zero |
31 |
dl |
1.4 |
*/ |
32 |
dl |
1.1 |
public void testConstructor2(){ |
33 |
|
|
AtomicInteger ai = new AtomicInteger(); |
34 |
|
|
assertEquals(0,ai.get()); |
35 |
|
|
} |
36 |
|
|
|
37 |
dl |
1.4 |
/** |
38 |
dl |
1.5 |
* get returns the last value set |
39 |
dl |
1.4 |
*/ |
40 |
dl |
1.1 |
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 |
|
|
|
48 |
|
|
} |
49 |
dl |
1.4 |
/** |
50 |
dl |
1.5 |
* compareAndSet succeeds in changing value if equal to expected else fails |
51 |
dl |
1.4 |
*/ |
52 |
dl |
1.1 |
public void testCompareAndSet(){ |
53 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
54 |
|
|
assertTrue(ai.compareAndSet(1,2)); |
55 |
|
|
assertTrue(ai.compareAndSet(2,-4)); |
56 |
|
|
assertEquals(-4,ai.get()); |
57 |
|
|
assertFalse(ai.compareAndSet(-5,7)); |
58 |
|
|
assertFalse((7 == ai.get())); |
59 |
|
|
assertTrue(ai.compareAndSet(-4,7)); |
60 |
|
|
assertEquals(7,ai.get()); |
61 |
|
|
} |
62 |
|
|
|
63 |
dl |
1.4 |
/** |
64 |
dl |
1.5 |
* compareAndSet in one thread enables another waiting for value |
65 |
|
|
* to succeed |
66 |
|
|
*/ |
67 |
|
|
public void testCompareAndSetInMultipleThreads() { |
68 |
|
|
final AtomicInteger ai = new AtomicInteger(1); |
69 |
|
|
Thread t = new Thread(new Runnable() { |
70 |
|
|
public void run() { |
71 |
|
|
while(!ai.compareAndSet(2, 3)) Thread.yield(); |
72 |
|
|
}}); |
73 |
|
|
try { |
74 |
|
|
t.start(); |
75 |
|
|
assertTrue(ai.compareAndSet(1, 2)); |
76 |
|
|
t.join(LONG_DELAY_MS); |
77 |
|
|
assertFalse(t.isAlive()); |
78 |
|
|
assertEquals(ai.get(), 3); |
79 |
|
|
} |
80 |
|
|
catch(Exception e) { |
81 |
|
|
unexpectedException(); |
82 |
|
|
} |
83 |
|
|
} |
84 |
|
|
|
85 |
|
|
/** |
86 |
|
|
* repeated weakCompareAndSet succeeds in changing value when equal |
87 |
|
|
* to expected |
88 |
dl |
1.4 |
*/ |
89 |
dl |
1.1 |
public void testWeakCompareAndSet(){ |
90 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
91 |
|
|
while(!ai.weakCompareAndSet(1,2)); |
92 |
|
|
while(!ai.weakCompareAndSet(2,-4)); |
93 |
|
|
assertEquals(-4,ai.get()); |
94 |
|
|
while(!ai.weakCompareAndSet(-4,7)); |
95 |
|
|
assertEquals(7,ai.get()); |
96 |
|
|
} |
97 |
|
|
|
98 |
dl |
1.4 |
/** |
99 |
dl |
1.5 |
* getAndSet returns previous value and sets to given value |
100 |
dl |
1.4 |
*/ |
101 |
dl |
1.1 |
public void testGetAndSet(){ |
102 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
103 |
|
|
assertEquals(1,ai.getAndSet(0)); |
104 |
|
|
assertEquals(0,ai.getAndSet(-10)); |
105 |
|
|
assertEquals(-10,ai.getAndSet(1)); |
106 |
|
|
} |
107 |
|
|
|
108 |
dl |
1.4 |
/** |
109 |
dl |
1.5 |
* getAndAdd returns previous value and adds given value |
110 |
dl |
1.4 |
*/ |
111 |
dl |
1.1 |
public void testGetAndAdd(){ |
112 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
113 |
|
|
assertEquals(1,ai.getAndAdd(2)); |
114 |
|
|
assertEquals(3,ai.get()); |
115 |
|
|
assertEquals(3,ai.getAndAdd(-4)); |
116 |
|
|
assertEquals(-1,ai.get()); |
117 |
|
|
} |
118 |
|
|
|
119 |
dl |
1.4 |
/** |
120 |
dl |
1.5 |
* getAndDecrement returns previous value and decrements |
121 |
dl |
1.4 |
*/ |
122 |
dl |
1.1 |
public void testGetAndDecrement(){ |
123 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
124 |
|
|
assertEquals(1,ai.getAndDecrement()); |
125 |
|
|
assertEquals(0,ai.getAndDecrement()); |
126 |
|
|
assertEquals(-1,ai.getAndDecrement()); |
127 |
|
|
} |
128 |
|
|
|
129 |
dl |
1.4 |
/** |
130 |
dl |
1.5 |
* getAndIncrement returns previous value and increments |
131 |
dl |
1.4 |
*/ |
132 |
dl |
1.1 |
public void testGetAndIncrement(){ |
133 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
134 |
|
|
assertEquals(1,ai.getAndIncrement()); |
135 |
|
|
assertEquals(2,ai.get()); |
136 |
|
|
ai.set(-2); |
137 |
|
|
assertEquals(-2,ai.getAndIncrement()); |
138 |
|
|
assertEquals(-1,ai.getAndIncrement()); |
139 |
|
|
assertEquals(0,ai.getAndIncrement()); |
140 |
|
|
assertEquals(1,ai.get()); |
141 |
|
|
} |
142 |
|
|
|
143 |
dl |
1.4 |
/** |
144 |
dl |
1.5 |
* addAndGet adds given value to current, and returns current value |
145 |
dl |
1.4 |
*/ |
146 |
dl |
1.1 |
public void testAddAndGet(){ |
147 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
148 |
|
|
assertEquals(3,ai.addAndGet(2)); |
149 |
|
|
assertEquals(3,ai.get()); |
150 |
|
|
assertEquals(-1,ai.addAndGet(-4)); |
151 |
|
|
assertEquals(-1,ai.get()); |
152 |
|
|
} |
153 |
|
|
|
154 |
dl |
1.4 |
/** |
155 |
dl |
1.5 |
* decrementAndGet decrements and returns current value |
156 |
dl |
1.4 |
*/ |
157 |
dl |
1.1 |
public void testDecrementAndGet(){ |
158 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
159 |
|
|
assertEquals(0,ai.decrementAndGet()); |
160 |
|
|
assertEquals(-1,ai.decrementAndGet()); |
161 |
|
|
assertEquals(-2,ai.decrementAndGet()); |
162 |
|
|
assertEquals(-2,ai.get()); |
163 |
|
|
} |
164 |
|
|
|
165 |
dl |
1.4 |
/** |
166 |
dl |
1.5 |
* incrementAndGet increments and returns current value |
167 |
dl |
1.4 |
*/ |
168 |
dl |
1.1 |
public void testIncrementAndGet(){ |
169 |
|
|
AtomicInteger ai = new AtomicInteger(1); |
170 |
|
|
assertEquals(2,ai.incrementAndGet()); |
171 |
|
|
assertEquals(2,ai.get()); |
172 |
|
|
ai.set(-2); |
173 |
|
|
assertEquals(-1,ai.incrementAndGet()); |
174 |
|
|
assertEquals(0,ai.incrementAndGet()); |
175 |
|
|
assertEquals(1,ai.incrementAndGet()); |
176 |
|
|
assertEquals(1,ai.get()); |
177 |
dl |
1.2 |
} |
178 |
|
|
|
179 |
dl |
1.4 |
/** |
180 |
dl |
1.5 |
* a deserialized serialized atomic holds same value |
181 |
dl |
1.4 |
*/ |
182 |
dl |
1.2 |
public void testSerialization() { |
183 |
|
|
AtomicInteger l = new AtomicInteger(); |
184 |
|
|
|
185 |
|
|
try { |
186 |
|
|
l.set(22); |
187 |
|
|
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
188 |
|
|
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
189 |
|
|
out.writeObject(l); |
190 |
|
|
out.close(); |
191 |
|
|
|
192 |
|
|
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
193 |
|
|
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
194 |
|
|
AtomicInteger r = (AtomicInteger) in.readObject(); |
195 |
|
|
assertEquals(l.get(), r.get()); |
196 |
|
|
} catch(Exception e){ |
197 |
dl |
1.4 |
unexpectedException(); |
198 |
dl |
1.2 |
} |
199 |
dl |
1.1 |
} |
200 |
|
|
|
201 |
|
|
|
202 |
|
|
} |