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 |
} |
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public static Test suite() { |
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return new TestSuite(AtomicLongFieldUpdaterTest.class); |
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} |
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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 { |
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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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} |
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} |
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40 |
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public void checkCompareAndSetProtectedSub() { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
42 |
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a = updaterFor("protectedField"); |
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protectedField = 1; |
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assertTrue(a.compareAndSet(this, 1, 2)); |
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assertTrue(a.compareAndSet(this, 2, -4)); |
46 |
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assertEquals(-4, a.get(this)); |
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assertFalse(a.compareAndSet(this, -5, 7)); |
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assertEquals(-4, a.get(this)); |
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assertTrue(a.compareAndSet(this, -4, 7)); |
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assertEquals(7, a.get(this)); |
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} |
52 |
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} |
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static class UnrelatedClass { |
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public void checkPrivateAccess() { |
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Exception ex = null; |
57 |
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try { |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a = |
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AtomicLongFieldUpdater.newUpdater |
60 |
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(AtomicLongFieldUpdaterTest.class, "x"); |
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} catch (RuntimeException rex) { |
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ex = rex; |
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} |
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if (ex != null) throw new Error(); |
65 |
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} |
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} |
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jsr166 |
1.24 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> updaterFor(String fieldName) { |
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return AtomicLongFieldUpdater.newUpdater |
70 |
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(AtomicLongFieldUpdaterTest.class, fieldName); |
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} |
72 |
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|
73 |
dl |
1.3 |
/** |
74 |
dl |
1.7 |
* Construction with non-existent field throws RuntimeException |
75 |
dl |
1.3 |
*/ |
76 |
jsr166 |
1.12 |
public void testConstructor() { |
77 |
jsr166 |
1.11 |
try { |
78 |
jsr166 |
1.24 |
updaterFor("y"); |
79 |
dl |
1.3 |
shouldThrow(); |
80 |
jsr166 |
1.25 |
} catch (RuntimeException success) { |
81 |
jsr166 |
1.26 |
assertNotNull(success.getCause()); |
82 |
jsr166 |
1.25 |
} |
83 |
dl |
1.1 |
} |
84 |
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|
85 |
dl |
1.3 |
/** |
86 |
jsr166 |
1.25 |
* construction with field not of given type throws IllegalArgumentException |
87 |
dl |
1.3 |
*/ |
88 |
jsr166 |
1.12 |
public void testConstructor2() { |
89 |
jsr166 |
1.11 |
try { |
90 |
jsr166 |
1.24 |
updaterFor("z"); |
91 |
dl |
1.3 |
shouldThrow(); |
92 |
jsr166 |
1.25 |
} catch (IllegalArgumentException success) {} |
93 |
dl |
1.1 |
} |
94 |
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|
95 |
dl |
1.3 |
/** |
96 |
jsr166 |
1.25 |
* construction with non-volatile field throws IllegalArgumentException |
97 |
dl |
1.3 |
*/ |
98 |
jsr166 |
1.12 |
public void testConstructor3() { |
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jsr166 |
1.11 |
try { |
100 |
jsr166 |
1.24 |
updaterFor("w"); |
101 |
dl |
1.3 |
shouldThrow(); |
102 |
jsr166 |
1.25 |
} catch (IllegalArgumentException success) {} |
103 |
dl |
1.1 |
} |
104 |
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105 |
dl |
1.3 |
/** |
106 |
dl |
1.30 |
* construction using private field from subclass throws RuntimeException |
107 |
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*/ |
108 |
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public void testPrivateFieldInSubclass() { |
109 |
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AtomicLongFieldUpdaterTestSubclass s = |
110 |
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new AtomicLongFieldUpdaterTestSubclass(); |
111 |
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s.checkPrivateAccess(); |
112 |
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} |
113 |
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114 |
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/** |
115 |
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* construction from unrelated class throws RuntimeException |
116 |
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*/ |
117 |
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public void testUnrelatedClassAccess() { |
118 |
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UnrelatedClass s = new UnrelatedClass(); |
119 |
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s.checkPrivateAccess(); |
120 |
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} |
121 |
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122 |
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/** |
123 |
jsr166 |
1.18 |
* get returns the last value set or assigned |
124 |
dl |
1.3 |
*/ |
125 |
jsr166 |
1.12 |
public void testGetSet() { |
126 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
127 |
jsr166 |
1.24 |
a = updaterFor("x"); |
128 |
dl |
1.1 |
x = 1; |
129 |
jsr166 |
1.22 |
assertEquals(1, a.get(this)); |
130 |
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a.set(this, 2); |
131 |
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assertEquals(2, a.get(this)); |
132 |
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a.set(this, -3); |
133 |
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assertEquals(-3, a.get(this)); |
134 |
dl |
1.1 |
} |
135 |
dl |
1.9 |
|
136 |
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/** |
137 |
jsr166 |
1.18 |
* get returns the last value lazySet by same thread |
138 |
dl |
1.9 |
*/ |
139 |
jsr166 |
1.12 |
public void testGetLazySet() { |
140 |
dl |
1.9 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
141 |
jsr166 |
1.24 |
a = updaterFor("x"); |
142 |
dl |
1.9 |
x = 1; |
143 |
jsr166 |
1.22 |
assertEquals(1, a.get(this)); |
144 |
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a.lazySet(this, 2); |
145 |
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assertEquals(2, a.get(this)); |
146 |
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a.lazySet(this, -3); |
147 |
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assertEquals(-3, a.get(this)); |
148 |
dl |
1.9 |
} |
149 |
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|
150 |
dl |
1.3 |
/** |
151 |
dl |
1.4 |
* compareAndSet succeeds in changing value if equal to expected else fails |
152 |
dl |
1.3 |
*/ |
153 |
jsr166 |
1.12 |
public void testCompareAndSet() { |
154 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
155 |
jsr166 |
1.24 |
a = updaterFor("x"); |
156 |
dl |
1.1 |
x = 1; |
157 |
jsr166 |
1.22 |
assertTrue(a.compareAndSet(this, 1, 2)); |
158 |
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assertTrue(a.compareAndSet(this, 2, -4)); |
159 |
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assertEquals(-4, a.get(this)); |
160 |
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assertFalse(a.compareAndSet(this, -5, 7)); |
161 |
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assertEquals(-4, a.get(this)); |
162 |
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assertTrue(a.compareAndSet(this, -4, 7)); |
163 |
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assertEquals(7, a.get(this)); |
164 |
dl |
1.1 |
} |
165 |
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|
166 |
dl |
1.4 |
/** |
167 |
dl |
1.30 |
* compareAndSet succeeds in changing protected field value if |
168 |
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* equal to expected else fails |
169 |
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*/ |
170 |
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public void testCompareAndSetProtected() { |
171 |
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AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
172 |
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a = updaterFor("protectedField"); |
173 |
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protectedField = 1; |
174 |
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assertTrue(a.compareAndSet(this, 1, 2)); |
175 |
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assertTrue(a.compareAndSet(this, 2, -4)); |
176 |
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assertEquals(-4, a.get(this)); |
177 |
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assertFalse(a.compareAndSet(this, -5, 7)); |
178 |
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assertEquals(-4, a.get(this)); |
179 |
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assertTrue(a.compareAndSet(this, -4, 7)); |
180 |
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assertEquals(7, a.get(this)); |
181 |
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} |
182 |
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183 |
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/** |
184 |
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* compareAndSet succeeds in changing protected field value if |
185 |
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* equal to expected else fails |
186 |
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*/ |
187 |
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public void testCompareAndSetProtectedInSubclass() { |
188 |
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AtomicLongFieldUpdaterTestSubclass s = |
189 |
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new AtomicLongFieldUpdaterTestSubclass(); |
190 |
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s.checkCompareAndSetProtectedSub(); |
191 |
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} |
192 |
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193 |
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/** |
194 |
dl |
1.4 |
* compareAndSet in one thread enables another waiting for value |
195 |
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* to succeed |
196 |
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*/ |
197 |
jsr166 |
1.13 |
public void testCompareAndSetInMultipleThreads() throws Exception { |
198 |
dl |
1.4 |
x = 1; |
199 |
jsr166 |
1.24 |
final AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
200 |
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a = updaterFor("x"); |
201 |
dl |
1.4 |
|
202 |
jsr166 |
1.14 |
Thread t = new Thread(new CheckedRunnable() { |
203 |
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public void realRun() { |
204 |
|
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while (!a.compareAndSet(AtomicLongFieldUpdaterTest.this, 2, 3)) |
205 |
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Thread.yield(); |
206 |
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}}); |
207 |
jsr166 |
1.13 |
|
208 |
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t.start(); |
209 |
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assertTrue(a.compareAndSet(this, 1, 2)); |
210 |
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t.join(LONG_DELAY_MS); |
211 |
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assertFalse(t.isAlive()); |
212 |
jsr166 |
1.23 |
assertEquals(3, a.get(this)); |
213 |
dl |
1.4 |
} |
214 |
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|
215 |
dl |
1.3 |
/** |
216 |
dl |
1.4 |
* repeated weakCompareAndSet succeeds in changing value when equal |
217 |
jsr166 |
1.10 |
* to expected |
218 |
dl |
1.3 |
*/ |
219 |
jsr166 |
1.12 |
public void testWeakCompareAndSet() { |
220 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
221 |
jsr166 |
1.24 |
a = updaterFor("x"); |
222 |
dl |
1.1 |
x = 1; |
223 |
jsr166 |
1.28 |
do {} while (!a.weakCompareAndSet(this, 1, 2)); |
224 |
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do {} while (!a.weakCompareAndSet(this, 2, -4)); |
225 |
jsr166 |
1.22 |
assertEquals(-4, a.get(this)); |
226 |
jsr166 |
1.28 |
do {} while (!a.weakCompareAndSet(this, -4, 7)); |
227 |
jsr166 |
1.22 |
assertEquals(7, a.get(this)); |
228 |
dl |
1.1 |
} |
229 |
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|
230 |
dl |
1.3 |
/** |
231 |
jsr166 |
1.18 |
* getAndSet returns previous value and sets to given value |
232 |
dl |
1.3 |
*/ |
233 |
jsr166 |
1.12 |
public void testGetAndSet() { |
234 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
235 |
jsr166 |
1.24 |
a = updaterFor("x"); |
236 |
dl |
1.1 |
x = 1; |
237 |
jsr166 |
1.22 |
assertEquals(1, a.getAndSet(this, 0)); |
238 |
|
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assertEquals(0, a.getAndSet(this, -10)); |
239 |
|
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assertEquals(-10, a.getAndSet(this, 1)); |
240 |
dl |
1.1 |
} |
241 |
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|
242 |
dl |
1.3 |
/** |
243 |
dl |
1.4 |
* getAndAdd returns previous value and adds given value |
244 |
dl |
1.3 |
*/ |
245 |
jsr166 |
1.12 |
public void testGetAndAdd() { |
246 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
247 |
jsr166 |
1.24 |
a = updaterFor("x"); |
248 |
dl |
1.1 |
x = 1; |
249 |
jsr166 |
1.22 |
assertEquals(1, a.getAndAdd(this, 2)); |
250 |
|
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assertEquals(3, a.get(this)); |
251 |
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assertEquals(3, a.getAndAdd(this, -4)); |
252 |
|
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assertEquals(-1, a.get(this)); |
253 |
dl |
1.1 |
} |
254 |
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|
255 |
dl |
1.3 |
/** |
256 |
dl |
1.4 |
* getAndDecrement returns previous value and decrements |
257 |
dl |
1.3 |
*/ |
258 |
jsr166 |
1.12 |
public void testGetAndDecrement() { |
259 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
260 |
jsr166 |
1.24 |
a = updaterFor("x"); |
261 |
dl |
1.1 |
x = 1; |
262 |
jsr166 |
1.22 |
assertEquals(1, a.getAndDecrement(this)); |
263 |
|
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assertEquals(0, a.getAndDecrement(this)); |
264 |
|
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assertEquals(-1, a.getAndDecrement(this)); |
265 |
dl |
1.1 |
} |
266 |
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|
267 |
dl |
1.3 |
/** |
268 |
dl |
1.4 |
* getAndIncrement returns previous value and increments |
269 |
dl |
1.3 |
*/ |
270 |
jsr166 |
1.12 |
public void testGetAndIncrement() { |
271 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
272 |
jsr166 |
1.24 |
a = updaterFor("x"); |
273 |
dl |
1.1 |
x = 1; |
274 |
jsr166 |
1.22 |
assertEquals(1, a.getAndIncrement(this)); |
275 |
|
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assertEquals(2, a.get(this)); |
276 |
|
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a.set(this, -2); |
277 |
|
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assertEquals(-2, a.getAndIncrement(this)); |
278 |
|
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assertEquals(-1, a.getAndIncrement(this)); |
279 |
|
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assertEquals(0, a.getAndIncrement(this)); |
280 |
|
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assertEquals(1, a.get(this)); |
281 |
dl |
1.1 |
} |
282 |
|
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|
283 |
dl |
1.3 |
/** |
284 |
dl |
1.4 |
* addAndGet adds given value to current, and returns current value |
285 |
dl |
1.3 |
*/ |
286 |
jsr166 |
1.12 |
public void testAddAndGet() { |
287 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
288 |
jsr166 |
1.24 |
a = updaterFor("x"); |
289 |
dl |
1.1 |
x = 1; |
290 |
jsr166 |
1.22 |
assertEquals(3, a.addAndGet(this, 2)); |
291 |
|
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assertEquals(3, a.get(this)); |
292 |
|
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assertEquals(-1, a.addAndGet(this, -4)); |
293 |
|
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assertEquals(-1, a.get(this)); |
294 |
dl |
1.1 |
} |
295 |
|
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|
296 |
dl |
1.3 |
/** |
297 |
jsr166 |
1.18 |
* decrementAndGet decrements and returns current value |
298 |
dl |
1.3 |
*/ |
299 |
jsr166 |
1.12 |
public void testDecrementAndGet() { |
300 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
301 |
jsr166 |
1.24 |
a = updaterFor("x"); |
302 |
dl |
1.1 |
x = 1; |
303 |
jsr166 |
1.22 |
assertEquals(0, a.decrementAndGet(this)); |
304 |
|
|
assertEquals(-1, a.decrementAndGet(this)); |
305 |
|
|
assertEquals(-2, a.decrementAndGet(this)); |
306 |
|
|
assertEquals(-2, a.get(this)); |
307 |
dl |
1.1 |
} |
308 |
|
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|
309 |
dl |
1.3 |
/** |
310 |
dl |
1.4 |
* incrementAndGet increments and returns current value |
311 |
dl |
1.3 |
*/ |
312 |
jsr166 |
1.12 |
public void testIncrementAndGet() { |
313 |
dl |
1.8 |
AtomicLongFieldUpdater<AtomicLongFieldUpdaterTest> a; |
314 |
jsr166 |
1.24 |
a = updaterFor("x"); |
315 |
dl |
1.1 |
x = 1; |
316 |
jsr166 |
1.22 |
assertEquals(2, a.incrementAndGet(this)); |
317 |
|
|
assertEquals(2, a.get(this)); |
318 |
|
|
a.set(this, -2); |
319 |
|
|
assertEquals(-1, a.incrementAndGet(this)); |
320 |
|
|
assertEquals(0, a.incrementAndGet(this)); |
321 |
|
|
assertEquals(1, a.incrementAndGet(this)); |
322 |
|
|
assertEquals(1, a.get(this)); |
323 |
dl |
1.1 |
} |
324 |
|
|
|
325 |
|
|
} |