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/publicdomain/zero/1.0/ |
5 |
> |
* Other contributors include Andrew Wright, Jeffrey Hayes, |
6 |
> |
* Pat Fisher, Mike Judd. |
7 |
|
*/ |
8 |
|
|
9 |
|
import junit.framework.*; |
10 |
< |
import java.util.concurrent.atomic.*; |
11 |
< |
import java.io.*; |
10 |
> |
import java.util.Arrays; |
11 |
> |
import java.util.concurrent.atomic.AtomicReferenceArray; |
12 |
|
|
13 |
< |
public class AtomicReferenceArrayTest extends JSR166TestCase |
14 |
< |
{ |
15 |
< |
public static void main (String[] args) { |
15 |
< |
junit.textui.TestRunner.run (suite()); |
13 |
> |
public class AtomicReferenceArrayTest extends JSR166TestCase { |
14 |
> |
public static void main(String[] args) { |
15 |
> |
junit.textui.TestRunner.run(suite()); |
16 |
|
} |
17 |
|
public static Test suite() { |
18 |
|
return new TestSuite(AtomicReferenceArrayTest.class); |
19 |
|
} |
20 |
|
|
21 |
|
/** |
22 |
< |
* |
22 |
> |
* constructor creates array of given size with all elements null |
23 |
|
*/ |
24 |
< |
public void testConstructor(){ |
24 |
> |
public void testConstructor() { |
25 |
|
AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE); |
26 |
|
for (int i = 0; i < SIZE; ++i) { |
27 |
|
assertNull(ai.get(i)); |
29 |
|
} |
30 |
|
|
31 |
|
/** |
32 |
< |
* |
32 |
> |
* constructor with null array throws NPE |
33 |
|
*/ |
34 |
< |
public void testGetSet(){ |
35 |
< |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
34 |
> |
public void testConstructor2NPE() { |
35 |
> |
try { |
36 |
> |
Integer[] a = null; |
37 |
> |
AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a); |
38 |
> |
shouldThrow(); |
39 |
> |
} catch (NullPointerException success) {} |
40 |
> |
} |
41 |
> |
|
42 |
> |
/** |
43 |
> |
* constructor with array is of same size and has all elements |
44 |
> |
*/ |
45 |
> |
public void testConstructor2() { |
46 |
> |
Integer[] a = { two, one, three, four, seven }; |
47 |
> |
AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a); |
48 |
> |
assertEquals(a.length, ai.length()); |
49 |
> |
for (int i = 0; i < a.length; ++i) |
50 |
> |
assertEquals(a[i], ai.get(i)); |
51 |
> |
} |
52 |
> |
|
53 |
> |
/** |
54 |
> |
* Initialize AtomicReference<Class> with SubClass[] |
55 |
> |
*/ |
56 |
> |
public void testConstructorSubClassArray() { |
57 |
> |
Integer[] a = { two, one, three, four, seven }; |
58 |
> |
AtomicReferenceArray<Number> aa = new AtomicReferenceArray<Number>(a); |
59 |
> |
assertEquals(a.length, aa.length()); |
60 |
> |
for (int i = 0; i < a.length; ++i) { |
61 |
> |
assertSame(a[i], aa.get(i)); |
62 |
> |
Long x = Long.valueOf(i); |
63 |
> |
aa.set(i, x); |
64 |
> |
assertSame(x, aa.get(i)); |
65 |
> |
} |
66 |
> |
} |
67 |
> |
|
68 |
> |
/** |
69 |
> |
* get and set for out of bound indices throw IndexOutOfBoundsException |
70 |
> |
*/ |
71 |
> |
public void testIndexing() { |
72 |
> |
AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE); |
73 |
> |
try { |
74 |
> |
ai.get(SIZE); |
75 |
> |
shouldThrow(); |
76 |
> |
} catch (IndexOutOfBoundsException success) { |
77 |
> |
} |
78 |
> |
try { |
79 |
> |
ai.get(-1); |
80 |
> |
shouldThrow(); |
81 |
> |
} catch (IndexOutOfBoundsException success) { |
82 |
> |
} |
83 |
> |
try { |
84 |
> |
ai.set(SIZE, null); |
85 |
> |
shouldThrow(); |
86 |
> |
} catch (IndexOutOfBoundsException success) { |
87 |
> |
} |
88 |
> |
try { |
89 |
> |
ai.set(-1, null); |
90 |
> |
shouldThrow(); |
91 |
> |
} catch (IndexOutOfBoundsException success) { |
92 |
> |
} |
93 |
> |
} |
94 |
> |
|
95 |
> |
/** |
96 |
> |
* get returns the last value set at index |
97 |
> |
*/ |
98 |
> |
public void testGetSet() { |
99 |
> |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
100 |
|
for (int i = 0; i < SIZE; ++i) { |
101 |
|
ai.set(i, one); |
102 |
< |
assertEquals(one,ai.get(i)); |
102 |
> |
assertSame(one, ai.get(i)); |
103 |
|
ai.set(i, two); |
104 |
< |
assertEquals(two,ai.get(i)); |
104 |
> |
assertSame(two, ai.get(i)); |
105 |
|
ai.set(i, m3); |
106 |
< |
assertEquals(m3,ai.get(i)); |
106 |
> |
assertSame(m3, ai.get(i)); |
107 |
|
} |
108 |
|
} |
109 |
|
|
110 |
|
/** |
111 |
< |
* |
111 |
> |
* get returns the last value lazySet at index by same thread |
112 |
|
*/ |
113 |
< |
public void testCompareAndSet(){ |
114 |
< |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
113 |
> |
public void testGetLazySet() { |
114 |
> |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
115 |
|
for (int i = 0; i < SIZE; ++i) { |
116 |
< |
ai.set(i, one); |
117 |
< |
assertTrue(ai.compareAndSet(i, one,two)); |
118 |
< |
assertTrue(ai.compareAndSet(i, two,m4)); |
119 |
< |
assertEquals(m4,ai.get(i)); |
120 |
< |
assertFalse(ai.compareAndSet(i, m5,seven)); |
121 |
< |
assertFalse((seven.equals(ai.get(i)))); |
58 |
< |
assertTrue(ai.compareAndSet(i, m4,seven)); |
59 |
< |
assertEquals(seven,ai.get(i)); |
116 |
> |
ai.lazySet(i, one); |
117 |
> |
assertSame(one, ai.get(i)); |
118 |
> |
ai.lazySet(i, two); |
119 |
> |
assertSame(two, ai.get(i)); |
120 |
> |
ai.lazySet(i, m3); |
121 |
> |
assertSame(m3, ai.get(i)); |
122 |
|
} |
123 |
|
} |
124 |
|
|
125 |
|
/** |
126 |
< |
* |
126 |
> |
* compareAndSet succeeds in changing value if equal to expected else fails |
127 |
|
*/ |
128 |
< |
public void testWeakCompareAndSet(){ |
129 |
< |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
128 |
> |
public void testCompareAndSet() { |
129 |
> |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
130 |
|
for (int i = 0; i < SIZE; ++i) { |
131 |
|
ai.set(i, one); |
132 |
< |
while(!ai.weakCompareAndSet(i, one,two)); |
133 |
< |
while(!ai.weakCompareAndSet(i, two,m4)); |
134 |
< |
assertEquals(m4,ai.get(i)); |
135 |
< |
while(!ai.weakCompareAndSet(i, m4,seven)); |
136 |
< |
assertEquals(seven,ai.get(i)); |
132 |
> |
assertTrue(ai.compareAndSet(i, one, two)); |
133 |
> |
assertTrue(ai.compareAndSet(i, two, m4)); |
134 |
> |
assertSame(m4, ai.get(i)); |
135 |
> |
assertFalse(ai.compareAndSet(i, m5, seven)); |
136 |
> |
assertSame(m4, ai.get(i)); |
137 |
> |
assertTrue(ai.compareAndSet(i, m4, seven)); |
138 |
> |
assertSame(seven, ai.get(i)); |
139 |
|
} |
140 |
|
} |
141 |
|
|
142 |
|
/** |
143 |
< |
* |
143 |
> |
* compareAndSet in one thread enables another waiting for value |
144 |
> |
* to succeed |
145 |
|
*/ |
146 |
< |
public void testGetAndSet(){ |
147 |
< |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
146 |
> |
public void testCompareAndSetInMultipleThreads() throws InterruptedException { |
147 |
> |
final AtomicReferenceArray a = new AtomicReferenceArray(1); |
148 |
> |
a.set(0, one); |
149 |
> |
Thread t = new Thread(new CheckedRunnable() { |
150 |
> |
public void realRun() { |
151 |
> |
while (!a.compareAndSet(0, two, three)) |
152 |
> |
Thread.yield(); |
153 |
> |
}}); |
154 |
> |
|
155 |
> |
t.start(); |
156 |
> |
assertTrue(a.compareAndSet(0, one, two)); |
157 |
> |
t.join(LONG_DELAY_MS); |
158 |
> |
assertFalse(t.isAlive()); |
159 |
> |
assertSame(a.get(0), three); |
160 |
> |
} |
161 |
> |
|
162 |
> |
/** |
163 |
> |
* repeated weakCompareAndSet succeeds in changing value when equal |
164 |
> |
* to expected |
165 |
> |
*/ |
166 |
> |
public void testWeakCompareAndSet() { |
167 |
> |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
168 |
|
for (int i = 0; i < SIZE; ++i) { |
169 |
|
ai.set(i, one); |
170 |
< |
assertEquals(one,ai.getAndSet(i,zero)); |
171 |
< |
assertEquals(0,ai.getAndSet(i,m10)); |
172 |
< |
assertEquals(m10,ai.getAndSet(i,one)); |
170 |
> |
while (!ai.weakCompareAndSet(i, one, two)); |
171 |
> |
while (!ai.weakCompareAndSet(i, two, m4)); |
172 |
> |
assertSame(m4, ai.get(i)); |
173 |
> |
while (!ai.weakCompareAndSet(i, m4, seven)); |
174 |
> |
assertSame(seven, ai.get(i)); |
175 |
|
} |
176 |
|
} |
177 |
|
|
178 |
|
/** |
179 |
< |
* |
179 |
> |
* getAndSet returns previous value and sets to given value at given index |
180 |
|
*/ |
181 |
< |
public void testSerialization() { |
182 |
< |
AtomicReferenceArray l = new AtomicReferenceArray(SIZE); |
181 |
> |
public void testGetAndSet() { |
182 |
> |
AtomicReferenceArray ai = new AtomicReferenceArray(SIZE); |
183 |
|
for (int i = 0; i < SIZE; ++i) { |
184 |
< |
l.set(i, new Integer(-i)); |
184 |
> |
ai.set(i, one); |
185 |
> |
assertSame(one, ai.getAndSet(i, zero)); |
186 |
> |
assertSame(zero, ai.getAndSet(i, m10)); |
187 |
> |
assertSame(m10, ai.getAndSet(i, one)); |
188 |
|
} |
189 |
+ |
} |
190 |
|
|
191 |
< |
try { |
192 |
< |
ByteArrayOutputStream bout = new ByteArrayOutputStream(10000); |
193 |
< |
ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout)); |
194 |
< |
out.writeObject(l); |
195 |
< |
out.close(); |
196 |
< |
|
197 |
< |
ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray()); |
198 |
< |
ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin)); |
199 |
< |
AtomicReferenceArray r = (AtomicReferenceArray) in.readObject(); |
200 |
< |
assertEquals(l.length(), r.length()); |
201 |
< |
for (int i = 0; i < SIZE; ++i) { |
202 |
< |
assertEquals(r.get(i), l.get(i)); |
203 |
< |
} |
113 |
< |
} catch(Exception e){ |
114 |
< |
unexpectedException(); |
191 |
> |
/** |
192 |
> |
* a deserialized serialized array holds same values |
193 |
> |
*/ |
194 |
> |
public void testSerialization() throws Exception { |
195 |
> |
AtomicReferenceArray x = new AtomicReferenceArray(SIZE); |
196 |
> |
for (int i = 0; i < SIZE; i++) { |
197 |
> |
x.set(i, new Integer(-i)); |
198 |
> |
} |
199 |
> |
AtomicReferenceArray y = serialClone(x); |
200 |
> |
assertTrue(x != y); |
201 |
> |
assertEquals(x.length(), y.length()); |
202 |
> |
for (int i = 0; i < SIZE; i++) { |
203 |
> |
assertEquals(x.get(i), y.get(i)); |
204 |
|
} |
205 |
|
} |
206 |
|
|
207 |
+ |
/** |
208 |
+ |
* toString returns current value. |
209 |
+ |
*/ |
210 |
+ |
public void testToString() { |
211 |
+ |
Integer[] a = { two, one, three, four, seven }; |
212 |
+ |
AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a); |
213 |
+ |
assertEquals(Arrays.toString(a), ai.toString()); |
214 |
+ |
} |
215 |
|
} |