1 |
dl |
1.1 |
/* |
2 |
dl |
1.6 |
* Written by Doug Lea with assistance from members of JCP JSR-166 |
3 |
|
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* Expert Group and released to the public domain, as explained at |
4 |
jsr166 |
1.19 |
* http://creativecommons.org/publicdomain/zero/1.0/ |
5 |
jsr166 |
1.10 |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
|
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* Pat Fisher, Mike Judd. |
7 |
dl |
1.1 |
*/ |
8 |
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|
9 |
jsr166 |
1.21 |
import java.util.concurrent.atomic.AtomicLongFieldUpdater; |
10 |
dl |
1.1 |
|
11 |
jsr166 |
1.27 |
import junit.framework.Test; |
12 |
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import junit.framework.TestSuite; |
13 |
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|
14 |
dl |
1.2 |
public class AtomicLongFieldUpdaterTest extends JSR166TestCase { |
15 |
dl |
1.1 |
volatile long x = 0; |
16 |
dl |
1.30 |
protected volatile long protectedField; |
17 |
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private volatile long privateField; |
18 |
dl |
1.4 |
long w; |
19 |
dl |
1.30 |
float z; |
20 |
jsr166 |
1.12 |
public static void main(String[] args) { |
21 |
jsr166 |
1.29 |
main(suite(), args); |
22 |
dl |
1.1 |
} |
23 |
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public static Test suite() { |
24 |
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return new TestSuite(AtomicLongFieldUpdaterTest.class); |
25 |
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} |
26 |
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27 |
dl |
1.30 |
// for testing subclass access |
28 |
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static class AtomicLongFieldUpdaterTestSubclass extends AtomicLongFieldUpdaterTest { |
29 |
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public void checkPrivateAccess() { |
30 |
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try { |
31 |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = |
32 |
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AtomicLongFieldUpdater.newUpdater |
33 |
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(AtomicLongFieldUpdaterTest.class, "privateField"); |
34 |
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shouldThrow(); |
35 |
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} catch (RuntimeException success) { |
36 |
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assertNotNull(success.getCause()); |
37 |
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} |
38 |
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} |
39 |
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40 |
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public void checkCompareAndSetProtectedSub() { |
41 |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
42 |
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a = updaterFor("protectedField"); |
43 |
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protectedField = 1; |
44 |
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assertTrue(a.compareAndSet(this, 1, 2)); |
45 |
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assertTrue(a.compareAndSet(this, 2, -4)); |
46 |
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assertEquals(-4, a.get(this)); |
47 |
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assertFalse(a.compareAndSet(this, -5, 7)); |
48 |
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assertEquals(-4, a.get(this)); |
49 |
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assertTrue(a.compareAndSet(this, -4, 7)); |
50 |
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assertEquals(7, a.get(this)); |
51 |
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} |
52 |
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} |
53 |
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54 |
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static class UnrelatedClass { |
55 |
jsr166 |
1.31 |
public void checkPackageAccess(AtomicLongFieldUpdaterTest obj) { |
56 |
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obj.x = 72L; |
57 |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = |
58 |
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AtomicLongFieldUpdater.newUpdater |
59 |
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(AtomicLongFieldUpdaterTest.class, "x"); |
60 |
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assertEquals(72L, a.get(obj)); |
61 |
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assertTrue(a.compareAndSet(obj, 72L, 73L)); |
62 |
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assertEquals(73L, a.get(obj)); |
63 |
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} |
64 |
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65 |
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public void checkPrivateAccess(AtomicLongFieldUpdaterTest obj) { |
66 |
dl |
1.30 |
try { |
67 |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = |
68 |
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AtomicLongFieldUpdater.newUpdater |
69 |
jsr166 |
1.31 |
(AtomicLongFieldUpdaterTest.class, "privateField"); |
70 |
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throw new AssertionError("should throw"); |
71 |
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} catch (RuntimeException success) { |
72 |
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assertNotNull(success.getCause()); |
73 |
dl |
1.30 |
} |
74 |
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} |
75 |
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} |
76 |
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|
77 |
jsr166 |
1.24 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) { |
78 |
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return AtomicLongFieldUpdater.newUpdater |
79 |
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(AtomicLongFieldUpdaterTest.class, fieldName); |
80 |
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} |
81 |
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|
82 |
dl |
1.3 |
/** |
83 |
dl |
1.7 |
* Construction with non-existent field throws RuntimeException |
84 |
dl |
1.3 |
*/ |
85 |
jsr166 |
1.12 |
public void testConstructor() { |
86 |
jsr166 |
1.11 |
try { |
87 |
jsr166 |
1.24 |
updaterFor("y"); |
88 |
dl |
1.3 |
shouldThrow(); |
89 |
jsr166 |
1.25 |
} catch (RuntimeException success) { |
90 |
jsr166 |
1.26 |
assertNotNull(success.getCause()); |
91 |
jsr166 |
1.25 |
} |
92 |
dl |
1.1 |
} |
93 |
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|
94 |
dl |
1.3 |
/** |
95 |
jsr166 |
1.25 |
* construction with field not of given type throws IllegalArgumentException |
96 |
dl |
1.3 |
*/ |
97 |
jsr166 |
1.12 |
public void testConstructor2() { |
98 |
jsr166 |
1.11 |
try { |
99 |
jsr166 |
1.24 |
updaterFor("z"); |
100 |
dl |
1.3 |
shouldThrow(); |
101 |
jsr166 |
1.25 |
} catch (IllegalArgumentException success) {} |
102 |
dl |
1.1 |
} |
103 |
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|
104 |
dl |
1.3 |
/** |
105 |
jsr166 |
1.25 |
* construction with non-volatile field throws IllegalArgumentException |
106 |
dl |
1.3 |
*/ |
107 |
jsr166 |
1.12 |
public void testConstructor3() { |
108 |
jsr166 |
1.11 |
try { |
109 |
jsr166 |
1.24 |
updaterFor("w"); |
110 |
dl |
1.3 |
shouldThrow(); |
111 |
jsr166 |
1.25 |
} catch (IllegalArgumentException success) {} |
112 |
dl |
1.1 |
} |
113 |
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|
114 |
dl |
1.3 |
/** |
115 |
dl |
1.30 |
* construction using private field from subclass throws RuntimeException |
116 |
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*/ |
117 |
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public void testPrivateFieldInSubclass() { |
118 |
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AtomicLongFieldUpdaterTestSubclass s = |
119 |
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new AtomicLongFieldUpdaterTestSubclass(); |
120 |
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s.checkPrivateAccess(); |
121 |
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} |
122 |
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123 |
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/** |
124 |
jsr166 |
1.31 |
* construction from unrelated class; package access is allowed, |
125 |
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* private access is not |
126 |
dl |
1.30 |
*/ |
127 |
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public void testUnrelatedClassAccess() { |
128 |
jsr166 |
1.31 |
new UnrelatedClass().checkPackageAccess(this); |
129 |
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new UnrelatedClass().checkPrivateAccess(this); |
130 |
dl |
1.30 |
} |
131 |
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132 |
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/** |
133 |
jsr166 |
1.18 |
* get returns the last value set or assigned |
134 |
dl |
1.3 |
*/ |
135 |
jsr166 |
1.12 |
public void testGetSet() { |
136 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
137 |
jsr166 |
1.24 |
a = updaterFor("x"); |
138 |
dl |
1.1 |
x = 1; |
139 |
jsr166 |
1.22 |
assertEquals(1, a.get(this)); |
140 |
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a.set(this, 2); |
141 |
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assertEquals(2, a.get(this)); |
142 |
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a.set(this, -3); |
143 |
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assertEquals(-3, a.get(this)); |
144 |
dl |
1.1 |
} |
145 |
dl |
1.9 |
|
146 |
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/** |
147 |
jsr166 |
1.18 |
* get returns the last value lazySet by same thread |
148 |
dl |
1.9 |
*/ |
149 |
jsr166 |
1.12 |
public void testGetLazySet() { |
150 |
dl |
1.9 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
151 |
jsr166 |
1.24 |
a = updaterFor("x"); |
152 |
dl |
1.9 |
x = 1; |
153 |
jsr166 |
1.22 |
assertEquals(1, a.get(this)); |
154 |
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a.lazySet(this, 2); |
155 |
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assertEquals(2, a.get(this)); |
156 |
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a.lazySet(this, -3); |
157 |
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assertEquals(-3, a.get(this)); |
158 |
dl |
1.9 |
} |
159 |
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|
160 |
dl |
1.3 |
/** |
161 |
dl |
1.4 |
* compareAndSet succeeds in changing value if equal to expected else fails |
162 |
dl |
1.3 |
*/ |
163 |
jsr166 |
1.12 |
public void testCompareAndSet() { |
164 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
165 |
jsr166 |
1.24 |
a = updaterFor("x"); |
166 |
dl |
1.1 |
x = 1; |
167 |
jsr166 |
1.22 |
assertTrue(a.compareAndSet(this, 1, 2)); |
168 |
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assertTrue(a.compareAndSet(this, 2, -4)); |
169 |
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assertEquals(-4, a.get(this)); |
170 |
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assertFalse(a.compareAndSet(this, -5, 7)); |
171 |
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assertEquals(-4, a.get(this)); |
172 |
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assertTrue(a.compareAndSet(this, -4, 7)); |
173 |
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assertEquals(7, a.get(this)); |
174 |
dl |
1.1 |
} |
175 |
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|
176 |
dl |
1.4 |
/** |
177 |
dl |
1.30 |
* compareAndSet succeeds in changing protected field value if |
178 |
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* equal to expected else fails |
179 |
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*/ |
180 |
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public void testCompareAndSetProtected() { |
181 |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
182 |
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a = updaterFor("protectedField"); |
183 |
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protectedField = 1; |
184 |
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assertTrue(a.compareAndSet(this, 1, 2)); |
185 |
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assertTrue(a.compareAndSet(this, 2, -4)); |
186 |
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assertEquals(-4, a.get(this)); |
187 |
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assertFalse(a.compareAndSet(this, -5, 7)); |
188 |
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assertEquals(-4, a.get(this)); |
189 |
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assertTrue(a.compareAndSet(this, -4, 7)); |
190 |
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assertEquals(7, a.get(this)); |
191 |
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} |
192 |
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|
193 |
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/** |
194 |
|
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* compareAndSet succeeds in changing protected field value if |
195 |
|
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* equal to expected else fails |
196 |
|
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*/ |
197 |
|
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public void testCompareAndSetProtectedInSubclass() { |
198 |
|
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AtomicLongFieldUpdaterTestSubclass s = |
199 |
|
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new AtomicLongFieldUpdaterTestSubclass(); |
200 |
|
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s.checkCompareAndSetProtectedSub(); |
201 |
|
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} |
202 |
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|
203 |
|
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/** |
204 |
dl |
1.4 |
* compareAndSet in one thread enables another waiting for value |
205 |
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* to succeed |
206 |
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*/ |
207 |
jsr166 |
1.13 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
208 |
dl |
1.4 |
x = 1; |
209 |
jsr166 |
1.24 |
final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
210 |
|
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a = updaterFor("x"); |
211 |
dl |
1.4 |
|
212 |
jsr166 |
1.14 |
Thread t = new Thread(new CheckedRunnable() { |
213 |
|
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public void realRun() { |
214 |
|
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while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) |
215 |
|
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Thread.yield(); |
216 |
|
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}}); |
217 |
jsr166 |
1.13 |
|
218 |
|
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t.start(); |
219 |
|
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assertTrue(a.compareAndSet(this, 1, 2)); |
220 |
|
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t.join(LONG_DELAY_MS); |
221 |
|
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assertFalse(t.isAlive()); |
222 |
jsr166 |
1.23 |
assertEquals(3, a.get(this)); |
223 |
dl |
1.4 |
} |
224 |
|
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|
225 |
dl |
1.3 |
/** |
226 |
dl |
1.4 |
* repeated weakCompareAndSet succeeds in changing value when equal |
227 |
jsr166 |
1.10 |
* to expected |
228 |
dl |
1.3 |
*/ |
229 |
jsr166 |
1.12 |
public void testWeakCompareAndSet() { |
230 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
231 |
jsr166 |
1.24 |
a = updaterFor("x"); |
232 |
dl |
1.1 |
x = 1; |
233 |
jsr166 |
1.28 |
do {} while (!a.weakCompareAndSet(this, 1, 2)); |
234 |
|
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do {} while (!a.weakCompareAndSet(this, 2, -4)); |
235 |
jsr166 |
1.22 |
assertEquals(-4, a.get(this)); |
236 |
jsr166 |
1.28 |
do {} while (!a.weakCompareAndSet(this, -4, 7)); |
237 |
jsr166 |
1.22 |
assertEquals(7, a.get(this)); |
238 |
dl |
1.1 |
} |
239 |
|
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|
240 |
dl |
1.3 |
/** |
241 |
jsr166 |
1.18 |
* getAndSet returns previous value and sets to given value |
242 |
dl |
1.3 |
*/ |
243 |
jsr166 |
1.12 |
public void testGetAndSet() { |
244 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
245 |
jsr166 |
1.24 |
a = updaterFor("x"); |
246 |
dl |
1.1 |
x = 1; |
247 |
jsr166 |
1.22 |
assertEquals(1, a.getAndSet(this, 0)); |
248 |
|
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assertEquals(0, a.getAndSet(this, -10)); |
249 |
|
|
assertEquals(-10, a.getAndSet(this, 1)); |
250 |
dl |
1.1 |
} |
251 |
|
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|
252 |
dl |
1.3 |
/** |
253 |
dl |
1.4 |
* getAndAdd returns previous value and adds given value |
254 |
dl |
1.3 |
*/ |
255 |
jsr166 |
1.12 |
public void testGetAndAdd() { |
256 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
257 |
jsr166 |
1.24 |
a = updaterFor("x"); |
258 |
dl |
1.1 |
x = 1; |
259 |
jsr166 |
1.22 |
assertEquals(1, a.getAndAdd(this, 2)); |
260 |
|
|
assertEquals(3, a.get(this)); |
261 |
|
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assertEquals(3, a.getAndAdd(this, -4)); |
262 |
|
|
assertEquals(-1, a.get(this)); |
263 |
dl |
1.1 |
} |
264 |
|
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|
265 |
dl |
1.3 |
/** |
266 |
dl |
1.4 |
* getAndDecrement returns previous value and decrements |
267 |
dl |
1.3 |
*/ |
268 |
jsr166 |
1.12 |
public void testGetAndDecrement() { |
269 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
270 |
jsr166 |
1.24 |
a = updaterFor("x"); |
271 |
dl |
1.1 |
x = 1; |
272 |
jsr166 |
1.22 |
assertEquals(1, a.getAndDecrement(this)); |
273 |
|
|
assertEquals(0, a.getAndDecrement(this)); |
274 |
|
|
assertEquals(-1, a.getAndDecrement(this)); |
275 |
dl |
1.1 |
} |
276 |
|
|
|
277 |
dl |
1.3 |
/** |
278 |
dl |
1.4 |
* getAndIncrement returns previous value and increments |
279 |
dl |
1.3 |
*/ |
280 |
jsr166 |
1.12 |
public void testGetAndIncrement() { |
281 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
282 |
jsr166 |
1.24 |
a = updaterFor("x"); |
283 |
dl |
1.1 |
x = 1; |
284 |
jsr166 |
1.22 |
assertEquals(1, a.getAndIncrement(this)); |
285 |
|
|
assertEquals(2, a.get(this)); |
286 |
|
|
a.set(this, -2); |
287 |
|
|
assertEquals(-2, a.getAndIncrement(this)); |
288 |
|
|
assertEquals(-1, a.getAndIncrement(this)); |
289 |
|
|
assertEquals(0, a.getAndIncrement(this)); |
290 |
|
|
assertEquals(1, a.get(this)); |
291 |
dl |
1.1 |
} |
292 |
|
|
|
293 |
dl |
1.3 |
/** |
294 |
dl |
1.4 |
* addAndGet adds given value to current, and returns current value |
295 |
dl |
1.3 |
*/ |
296 |
jsr166 |
1.12 |
public void testAddAndGet() { |
297 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
298 |
jsr166 |
1.24 |
a = updaterFor("x"); |
299 |
dl |
1.1 |
x = 1; |
300 |
jsr166 |
1.22 |
assertEquals(3, a.addAndGet(this, 2)); |
301 |
|
|
assertEquals(3, a.get(this)); |
302 |
|
|
assertEquals(-1, a.addAndGet(this, -4)); |
303 |
|
|
assertEquals(-1, a.get(this)); |
304 |
dl |
1.1 |
} |
305 |
|
|
|
306 |
dl |
1.3 |
/** |
307 |
jsr166 |
1.18 |
* decrementAndGet decrements and returns current value |
308 |
dl |
1.3 |
*/ |
309 |
jsr166 |
1.12 |
public void testDecrementAndGet() { |
310 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
311 |
jsr166 |
1.24 |
a = updaterFor("x"); |
312 |
dl |
1.1 |
x = 1; |
313 |
jsr166 |
1.22 |
assertEquals(0, a.decrementAndGet(this)); |
314 |
|
|
assertEquals(-1, a.decrementAndGet(this)); |
315 |
|
|
assertEquals(-2, a.decrementAndGet(this)); |
316 |
|
|
assertEquals(-2, a.get(this)); |
317 |
dl |
1.1 |
} |
318 |
|
|
|
319 |
dl |
1.3 |
/** |
320 |
dl |
1.4 |
* incrementAndGet increments and returns current value |
321 |
dl |
1.3 |
*/ |
322 |
jsr166 |
1.12 |
public void testIncrementAndGet() { |
323 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
324 |
jsr166 |
1.24 |
a = updaterFor("x"); |
325 |
dl |
1.1 |
x = 1; |
326 |
jsr166 |
1.22 |
assertEquals(2, a.incrementAndGet(this)); |
327 |
|
|
assertEquals(2, a.get(this)); |
328 |
|
|
a.set(this, -2); |
329 |
|
|
assertEquals(-1, a.incrementAndGet(this)); |
330 |
|
|
assertEquals(0, a.incrementAndGet(this)); |
331 |
|
|
assertEquals(1, a.incrementAndGet(this)); |
332 |
|
|
assertEquals(1, a.get(this)); |
333 |
dl |
1.1 |
} |
334 |
|
|
|
335 |
|
|
} |