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root/jsr166/jsr166/src/test/tck/AtomicReferenceArrayTest.java

Comparing jsr166/src/test/tck/AtomicReferenceArrayTest.java (file contents):
Revision 1.1 by dl, Sun Aug 31 19:24:53 2003 UTC vs.
Revision 1.20 by jsr166, Fri May 27 19:39:07 2011 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/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.*;
12	+	import java.util.*;
13
14	<	public class AtomicReferenceArrayTest extends TestCase
15	<	{
16	<	static final int N = 10;
14	<
15	<	static final Integer zero = new Integer(0);
16	<	static final Integer one = new Integer(1);
17	<	static final Integer two = new Integer(2);
18	<	static final Integer m3  = new Integer(-3);
19	<	static final Integer m4 = new Integer(-4);
20	<	static final Integer m5 = new Integer(-5);
21	<	static final Integer seven = new Integer(7);
22	<	static final Integer m10 = new Integer(-10);
23	<
24	<	public static void main (String[] args) {
25	<	junit.textui.TestRunner.run (suite());
14	>	public class AtomicReferenceArrayTest extends JSR166TestCase {
15	>	public static void main(String[] args) {
16	>	junit.textui.TestRunner.run(suite());
17		}
18		public static Test suite() {
19		return new TestSuite(AtomicReferenceArrayTest.class);
20		}
21
22	<	public void testConstructor(){
23	<	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(N);
24	<	for (int i = 0; i < N; ++i) {
22	>	/**
23	>	* constructor creates array of given size with all elements null
24	>	*/
25	>	public void testConstructor() {
26	>	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
27	>	for (int i = 0; i < SIZE; ++i) {
28		assertNull(ai.get(i));
29		}
30		}
31
32	<	public void testGetSet(){
33	<	AtomicReferenceArray ai = new AtomicReferenceArray(N);
34	<	for (int i = 0; i < N; ++i) {
32	>	/**
33	>	* constructor with null array throws NPE
34	>	*/
35	>	public void testConstructor2NPE() {
36	>	try {
37	>	Integer[] a = null;
38	>	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
39	>	shouldThrow();
40	>	} catch (NullPointerException success) {}
41	>	}
42	>
43	>	/**
44	>	* constructor with array is of same size and has all elements
45	>	*/
46	>	public void testConstructor2() {
47	>	Integer[] a = { two, one, three, four, seven};
48	>	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
49	>	assertEquals(a.length, ai.length());
50	>	for (int i = 0; i < a.length; ++i)
51	>	assertEquals(a[i], ai.get(i));
52	>	}
53	>
54	>	/**
55	>	* get and set for out of bound indices throw IndexOutOfBoundsException
56	>	*/
57	>	public void testIndexing() {
58	>	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(SIZE);
59	>	try {
60	>	ai.get(SIZE);
61	>	shouldThrow();
62	>	} catch (IndexOutOfBoundsException success) {
63	>	}
64	>	try {
65	>	ai.get(-1);
66	>	shouldThrow();
67	>	} catch (IndexOutOfBoundsException success) {
68	>	}
69	>	try {
70	>	ai.set(SIZE, null);
71	>	shouldThrow();
72	>	} catch (IndexOutOfBoundsException success) {
73	>	}
74	>	try {
75	>	ai.set(-1, null);
76	>	shouldThrow();
77	>	} catch (IndexOutOfBoundsException success) {
78	>	}
79	>	}
80	>
81	>	/**
82	>	* get returns the last value set at index
83	>	*/
84	>	public void testGetSet() {
85	>	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
86	>	for (int i = 0; i < SIZE; ++i) {
87		ai.set(i, one);
88	<	assertEquals(one,ai.get(i));
88	>	assertSame(one,ai.get(i));
89		ai.set(i, two);
90	<	assertEquals(two,ai.get(i));
90	>	assertSame(two,ai.get(i));
91		ai.set(i, m3);
92	<	assertEquals(m3,ai.get(i));
92	>	assertSame(m3,ai.get(i));
93		}
94		}
95
96	<	public void testCompareAndSet(){
97	<	AtomicReferenceArray ai = new AtomicReferenceArray(N);
98	<	for (int i = 0; i < N; ++i) {
96	>	/**
97	>	* get returns the last value lazySet at index by same thread
98	>	*/
99	>	public void testGetLazySet() {
100	>	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
101	>	for (int i = 0; i < SIZE; ++i) {
102	>	ai.lazySet(i, one);
103	>	assertSame(one,ai.get(i));
104	>	ai.lazySet(i, two);
105	>	assertSame(two,ai.get(i));
106	>	ai.lazySet(i, m3);
107	>	assertSame(m3,ai.get(i));
108	>	}
109	>	}
110	>
111	>	/**
112	>	* compareAndSet succeeds in changing value if equal to expected else fails
113	>	*/
114	>	public void testCompareAndSet() {
115	>	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
116	>	for (int i = 0; i < SIZE; ++i) {
117		ai.set(i, one);
118		assertTrue(ai.compareAndSet(i, one,two));
119		assertTrue(ai.compareAndSet(i, two,m4));
120	<	assertEquals(m4,ai.get(i));
120	>	assertSame(m4,ai.get(i));
121		assertFalse(ai.compareAndSet(i, m5,seven));
122	<	assertFalse((seven.equals(ai.get(i))));
122	>	assertSame(m4,ai.get(i));
123		assertTrue(ai.compareAndSet(i, m4,seven));
124	<	assertEquals(seven,ai.get(i));
124	>	assertSame(seven,ai.get(i));
125		}
126		}
127
128	<	public void testWeakCompareAndSet(){
129	<	AtomicReferenceArray ai = new AtomicReferenceArray(N);
130	<	for (int i = 0; i < N; ++i) {
128	>	/**
129	>	* compareAndSet in one thread enables another waiting for value
130	>	* to succeed
131	>	*/
132	>	public void testCompareAndSetInMultipleThreads() throws InterruptedException {
133	>	final AtomicReferenceArray a = new AtomicReferenceArray(1);
134	>	a.set(0, one);
135	>	Thread t = new Thread(new CheckedRunnable() {
136	>	public void realRun() {
137	>	while (!a.compareAndSet(0, two, three))
138	>	Thread.yield();
139	>	}});
140	>
141	>	t.start();
142	>	assertTrue(a.compareAndSet(0, one, two));
143	>	t.join(LONG_DELAY_MS);
144	>	assertFalse(t.isAlive());
145	>	assertSame(a.get(0), three);
146	>	}
147	>
148	>	/**
149	>	* repeated weakCompareAndSet succeeds in changing value when equal
150	>	* to expected
151	>	*/
152	>	public void testWeakCompareAndSet() {
153	>	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
154	>	for (int i = 0; i < SIZE; ++i) {
155		ai.set(i, one);
156	<	while(!ai.weakCompareAndSet(i, one,two));
157	<	while(!ai.weakCompareAndSet(i, two,m4));
158	<	assertEquals(m4,ai.get(i));
159	<	while(!ai.weakCompareAndSet(i, m4,seven));
160	<	assertEquals(seven,ai.get(i));
156	>	while (!ai.weakCompareAndSet(i, one,two));
157	>	while (!ai.weakCompareAndSet(i, two,m4));
158	>	assertSame(m4,ai.get(i));
159	>	while (!ai.weakCompareAndSet(i, m4,seven));
160	>	assertSame(seven,ai.get(i));
161		}
162		}
163
164	<	public void testGetAndSet(){
165	<	AtomicReferenceArray ai = new AtomicReferenceArray(N);
166	<	for (int i = 0; i < N; ++i) {
164	>	/**
165	>	* getAndSet returns previous value and sets to given value at given index
166	>	*/
167	>	public void testGetAndSet() {
168	>	AtomicReferenceArray ai = new AtomicReferenceArray(SIZE);
169	>	for (int i = 0; i < SIZE; ++i) {
170		ai.set(i, one);
171	<	assertEquals(one,ai.getAndSet(i,zero));
172	<	assertEquals(0,ai.getAndSet(i,m10));
173	<	assertEquals(m10,ai.getAndSet(i,one));
171	>	assertSame(one,ai.getAndSet(i,zero));
172	>	assertSame(zero,ai.getAndSet(i,m10));
173	>	assertSame(m10,ai.getAndSet(i,one));
174		}
175		}
176
177	+	/**
178	+	* a deserialized serialized array holds same values
179	+	*/
180	+	public void testSerialization() throws Exception {
181	+	AtomicReferenceArray l = new AtomicReferenceArray(SIZE);
182	+	for (int i = 0; i < SIZE; ++i) {
183	+	l.set(i, new Integer(-i));
184	+	}
185
186	+	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
187	+	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
188	+	out.writeObject(l);
189	+	out.close();
190	+
191	+	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
192	+	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
193	+	AtomicReferenceArray r = (AtomicReferenceArray) in.readObject();
194	+	assertEquals(l.length(), r.length());
195	+	for (int i = 0; i < SIZE; ++i) {
196	+	assertEquals(r.get(i), l.get(i));
197	+	}
198	+	}
199	+
200	+	/**
201	+	* toString returns current value.
202	+	*/
203	+	public void testToString() {
204	+	Integer[] a = { two, one, three, four, seven};
205	+	AtomicReferenceArray<Integer> ai = new AtomicReferenceArray<Integer>(a);
206	+	assertEquals(Arrays.toString(a), ai.toString());
207	+	}
208		}

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