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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 1.26 by jsr166, Mon Apr 1 20:58:58 2013 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{
26	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
27	<	a = AtomicReferenceFieldUpdater.newUpdater
28	<	(getClass(), Integer.class, "y");
29	<	fail("Exception not thrown");
30	<	}
31	<
32	<	catch (RuntimeException rt) {}
33	<	}
34	<
35	<
36	<	public void testConstructor2(){
37	<	try{
38	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
39	<	a = AtomicReferenceFieldUpdater.newUpdater
40	<	(getClass(), Integer.class, "z");
41	<	fail("Exception not thrown");
42	<	}
43	<
44	<	catch (RuntimeException rt) {}
24	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer> updaterFor(String fieldName) {
25	>	return AtomicReferenceFieldUpdater.newUpdater
26	>	(AtomicReferenceFieldUpdaterTest.class, Integer.class, fieldName);
27	>	}
28	>
29	>	/**
30	>	* Construction with non-existent field throws RuntimeException
31	>	*/
32	>	public void testConstructor() {
33	>	try {
34	>	updaterFor("y");
35	>	shouldThrow();
36	>	} catch (RuntimeException success) {}
37	>	}
38	>
39	>	/**
40	>	* construction with field not of given type throws RuntimeException
41	>	*/
42	>	public void testConstructor2() {
43	>	try {
44	>	updaterFor("z");
45	>	shouldThrow();
46	>	} catch (RuntimeException success) {}
47	>	}
48	>
49	>	/**
50	>	* Constructor with non-volatile field throws exception
51	>	*/
52	>	public void testConstructor3() {
53	>	try {
54	>	updaterFor("w");
55	>	shouldThrow();
56	>	} catch (RuntimeException success) {}
57	>	}
58	>
59	>	/**
60	>	* get returns the last value set or assigned
61	>	*/
62	>	public void testGetSet() {
63	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
64	>	a = updaterFor("x");
65	>	x = one;
66	>	assertSame(one, a.get(this));
67	>	a.set(this, two);
68	>	assertSame(two, a.get(this));
69	>	a.set(this, m3);
70	>	assertSame(m3, a.get(this));
71		}
72
73	<	public void testConstructor3(){
74	<	try{
75	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
76	<	a = AtomicReferenceFieldUpdater.newUpdater
77	<	(getClass(), Integer.class, "w");
78	<	fail("Exception not thrown");
79	<	}
80	<
81	<	catch (RuntimeException rt) {}
73	>	/**
74	>	* get returns the last value lazySet by same thread
75	>	*/
76	>	public void testGetLazySet() {
77	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
78	>	a = updaterFor("x");
79	>	x = one;
80	>	assertSame(one, a.get(this));
81	>	a.lazySet(this, two);
82	>	assertSame(two, a.get(this));
83	>	a.lazySet(this, m3);
84	>	assertSame(m3, a.get(this));
85		}
86
87	<	public void testGetSet(){
88	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
87	>	/**
88	>	* compareAndSet succeeds in changing value if equal to expected else fails
89	>	*/
90	>	public void testCompareAndSet() {
91	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
92	>	a = updaterFor("x");
93		x = one;
94	<	assertEquals(one,a.get(this));
95	<	a.set(this,two);
96	<	assertEquals(two,a.get(this));
97	<	a.set(this,-3);
98	<	assertEquals(-3,a.get(this));
99	<
94	>	assertTrue(a.compareAndSet(this, one, two));
95	>	assertTrue(a.compareAndSet(this, two, m4));
96	>	assertSame(m4, a.get(this));
97	>	assertFalse(a.compareAndSet(this, m5, seven));
98	>	assertFalse(seven == a.get(this));
99	>	assertTrue(a.compareAndSet(this, m4, seven));
100	>	assertSame(seven, a.get(this));
101		}
102	<	public void testCompareAndSet(){
103	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
102	>
103	>	/**
104	>	* compareAndSet in one thread enables another waiting for value
105	>	* to succeed
106	>	*/
107	>	public void testCompareAndSetInMultipleThreads() throws Exception {
108		x = one;
109	<	assertTrue(a.compareAndSet(this,one,two));
110	<	assertTrue(a.compareAndSet(this,two,m4));
75	<	assertEquals(m4,a.get(this));
76	<	assertFalse(a.compareAndSet(this,m5,seven));
77	<	assertFalse((seven == a.get(this)));
78	<	assertTrue(a.compareAndSet(this,m4,seven));
79	<	assertEquals(seven,a.get(this));
80	<	}
109	>	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
110	>	a = updaterFor("x");
111
112	<	public void testWeakCompareAndSet(){
113	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
112	>	Thread t = new Thread(new CheckedRunnable() {
113	>	public void realRun() {
114	>	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
115	>	Thread.yield();
116	>	}});
117	>
118	>	t.start();
119	>	assertTrue(a.compareAndSet(this, one, two));
120	>	t.join(LONG_DELAY_MS);
121	>	assertFalse(t.isAlive());
122	>	assertSame(three, a.get(this));
123	>	}
124	>
125	>	/**
126	>	* repeated weakCompareAndSet succeeds in changing value when equal
127	>	* to expected
128	>	*/
129	>	public void testWeakCompareAndSet() {
130	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
131	>	a = updaterFor("x");
132		x = one;
133	<	while(!a.weakCompareAndSet(this,one,two));
134	<	while(!a.weakCompareAndSet(this,two,m4));
135	<	assertEquals(m4,a.get(this));
136	<	while(!a.weakCompareAndSet(this,m4,seven));
137	<	assertEquals(seven,a.get(this));
133	>	while (!a.weakCompareAndSet(this, one, two));
134	>	while (!a.weakCompareAndSet(this, two, m4));
135	>	assertSame(m4, a.get(this));
136	>	while (!a.weakCompareAndSet(this, m4, seven));
137	>	assertSame(seven, a.get(this));
138		}
139
140	<	public void testGetAndSet(){
141	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
140	>	/**
141	>	* getAndSet returns previous value and sets to given value
142	>	*/
143	>	public void testGetAndSet() {
144	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
145	>	a = updaterFor("x");
146		x = one;
147	<	assertEquals(one,a.getAndSet(this, zero));
148	<	assertEquals(zero,a.getAndSet(this,m10));
149	<	assertEquals(m10,a.getAndSet(this,1));
147	>	assertSame(one, a.getAndSet(this, zero));
148	>	assertSame(zero, a.getAndSet(this, m10));
149	>	assertSame(m10, a.getAndSet(this, 1));
150		}
151
152		}

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