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

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