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

Comparing jsr166/src/test/tck/AtomicReferenceFieldUpdaterTest.java (file contents):
Revision 1.2 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.19 by jsr166, Thu Sep 16 00:52:49 2010 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/licenses/publicdomain
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9		import java.util.concurrent.atomic.*;
10		import junit.framework.*;
11		import java.util.*;
12
13	<	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase{
13	>	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
14		volatile Integer x = null;
15		Object z;
16		Integer w;
17
18	<	public static void main(String[] args){
18	>	public static void main(String[] args) {
19		junit.textui.TestRunner.run(suite());
20		}
20	–
21	–
21		public static Test suite() {
22		return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
23		}
24
25	<	public void testConstructor(){
26	<	try{
25	>	/**
26	>	* Construction with non-existent field throws RuntimeException
27	>	*/
28	>	public void testConstructor() {
29	>	try {
30		AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
31		a = AtomicReferenceFieldUpdater.newUpdater
32	<	(getClass(), Integer.class, "y");
33	<	fail("Exception not thrown");
34	<	}
33	<
34	<	catch (RuntimeException rt) {}
32	>	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
33	>	shouldThrow();
34	>	} catch (RuntimeException success) {}
35		}
36
37
38	<	public void testConstructor2(){
39	<	try{
38	>	/**
39	>	* construction with field not of given type throws RuntimeException
40	>	*/
41	>	public void testConstructor2() {
42	>	try {
43		AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
44		a = AtomicReferenceFieldUpdater.newUpdater
45	<	(getClass(), Integer.class, "z");
46	<	fail("Exception not thrown");
47	<	}
45	<
46	<	catch (RuntimeException rt) {}
45	>	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
46	>	shouldThrow();
47	>	} catch (RuntimeException success) {}
48		}
49
50	<	public void testConstructor3(){
51	<	try{
50	>	/**
51	>	* Constructor with non-volatile field throws exception
52	>	*/
53	>	public void testConstructor3() {
54	>	try {
55		AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
56		a = AtomicReferenceFieldUpdater.newUpdater
57	<	(getClass(), Integer.class, "w");
58	<	fail("Exception not thrown");
59	<	}
56	<
57	<	catch (RuntimeException rt) {}
57	>	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
58	>	shouldThrow();
59	>	} catch (RuntimeException success) {}
60		}
61
62	<	public void testGetSet(){
63	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
62	>	/**
63	>	*  get returns the last value set or assigned
64	>	*/
65	>	public void testGetSet() {
66	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
67	>	try {
68	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
69	>	} catch (RuntimeException ok) {
70	>	return;
71	>	}
72		x = one;
73	<	assertEquals(one,a.get(this));
74	<	a.set(this,two);
75	<	assertEquals(two,a.get(this));
76	<	a.set(this,-3);
77	<	assertEquals(-3,a.get(this));
78	<
79	<	}
80	<	public void testCompareAndSet(){
81	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
73	>	assertSame(one,a.get(this));
74	>	a.set(this,two);
75	>	assertSame(two,a.get(this));
76	>	a.set(this,m3);
77	>	assertSame(m3,a.get(this));
78	>	}
79	>
80	>	/**
81	>	*  get returns the last value lazySet by same thread
82	>	*/
83	>	public void testGetLazySet() {
84	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
85	>	try {
86	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
87	>	} catch (RuntimeException ok) {
88	>	return;
89	>	}
90	>	x = one;
91	>	assertSame(one,a.get(this));
92	>	a.lazySet(this,two);
93	>	assertSame(two,a.get(this));
94	>	a.lazySet(this,m3);
95	>	assertSame(m3,a.get(this));
96	>	}
97	>
98	>	/**
99	>	* compareAndSet succeeds in changing value if equal to expected else fails
100	>	*/
101	>	public void testCompareAndSet() {
102	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
103	>	try {
104	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
105	>	} catch (RuntimeException ok) {
106	>	return;
107	>	}
108		x = one;
109	<	assertTrue(a.compareAndSet(this,one,two));
110	<	assertTrue(a.compareAndSet(this,two,m4));
111	<	assertEquals(m4,a.get(this));
112	<	assertFalse(a.compareAndSet(this,m5,seven));
113	<	assertFalse((seven == a.get(this)));
114	<	assertTrue(a.compareAndSet(this,m4,seven));
115	<	assertEquals(seven,a.get(this));
109	>	assertTrue(a.compareAndSet(this, one, two));
110	>	assertTrue(a.compareAndSet(this, two, m4));
111	>	assertSame(m4, a.get(this));
112	>	assertFalse(a.compareAndSet(this, m5, seven));
113	>	assertFalse(seven == a.get(this));
114	>	assertTrue(a.compareAndSet(this, m4, seven));
115	>	assertSame(seven,a.get(this));
116		}
117
118	<	public void testWeakCompareAndSet(){
119	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
118	>	/**
119	>	* compareAndSet in one thread enables another waiting for value
120	>	* to succeed
121	>	*/
122	>	public void testCompareAndSetInMultipleThreads() throws Exception {
123		x = one;
124	<	while(!a.weakCompareAndSet(this,one,two));
125	<	while(!a.weakCompareAndSet(this,two,m4));
126	<	assertEquals(m4,a.get(this));
127	<	while(!a.weakCompareAndSet(this,m4,seven));
128	<	assertEquals(seven,a.get(this));
129	<	}
124	>	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
125	>	try {
126	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
127	>	} catch (RuntimeException ok) {
128	>	return;
129	>	}
130
131	<	public void testGetAndSet(){
132	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
131	>	Thread t = new Thread(new CheckedRunnable() {
132	>	public void realRun() {
133	>	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
134	>	Thread.yield();
135	>	}});
136	>
137	>	t.start();
138	>	assertTrue(a.compareAndSet(this, one, two));
139	>	t.join(LONG_DELAY_MS);
140	>	assertFalse(t.isAlive());
141	>	assertSame(a.get(this), three);
142	>	}
143	>
144	>	/**
145	>	* repeated weakCompareAndSet succeeds in changing value when equal
146	>	* to expected
147	>	*/
148	>	public void testWeakCompareAndSet() {
149	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
150	>	try {
151	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
152	>	} catch (RuntimeException ok) {
153	>	return;
154	>	}
155	>	x = one;
156	>	while (!a.weakCompareAndSet(this,one,two));
157	>	while (!a.weakCompareAndSet(this,two,m4));
158	>	assertSame(m4,a.get(this));
159	>	while (!a.weakCompareAndSet(this,m4,seven));
160	>	assertSame(seven,a.get(this));
161	>	}
162	>
163	>	/**
164	>	* getAndSet returns previous value and sets to given value
165	>	*/
166	>	public void testGetAndSet() {
167	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
168	>	try {
169	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
170	>	} catch (RuntimeException ok) {
171	>	return;
172	>	}
173		x = one;
174	<	assertEquals(one,a.getAndSet(this, zero));
175	<	assertEquals(zero,a.getAndSet(this,m10));
176	<	assertEquals(m10,a.getAndSet(this,1));
174	>	assertSame(one,a.getAndSet(this, zero));
175	>	assertSame(zero,a.getAndSet(this,m10));
176	>	assertSame(m10,a.getAndSet(this,1));
177		}
178
179		}

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