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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 1.9 by dl, Tue Dec 28 16:15:59 2004 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.*;
#	Line 17 | Line 18 | public class AtomicReferenceFieldUpdater
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	+	/**
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");
32	>	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "y");
33	>	shouldThrow();
34		}
33	–
35		catch (RuntimeException rt) {}
36		}
37
38
39	+	/**
40	+	* construction with field not of given type throws RuntimeException
41	+	*/
42		public void testConstructor2(){
43		try{
44		AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
45		a = AtomicReferenceFieldUpdater.newUpdater
46	<	(getClass(), Integer.class, "z");
47	<	fail("Exception not thrown");
46	>	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "z");
47	>	shouldThrow();
48		}
45	–
49		catch (RuntimeException rt) {}
50		}
51
52	+	/**
53	+	* Constructor with non-volatile field throws exception
54	+	*/
55		public void testConstructor3(){
56		try{
57		AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
58		a = AtomicReferenceFieldUpdater.newUpdater
59	<	(getClass(), Integer.class, "w");
60	<	fail("Exception not thrown");
59	>	(AtomicReferenceFieldUpdaterTest.class, Integer.class, "w");
60	>	shouldThrow();
61		}
56	–
62		catch (RuntimeException rt) {}
63		}
64
65	+	/**
66	+	*  get returns the last value set or assigned
67	+	*/
68		public void testGetSet(){
69	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
69	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
70	>	try {
71	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
72	>	} catch (RuntimeException ok) {
73	>	return;
74	>	}
75		x = one;
76		assertEquals(one,a.get(this));
77		a.set(this,two);
78		assertEquals(two,a.get(this));
79	<	a.set(this,-3);
80	<	assertEquals(-3,a.get(this));
79	>	a.set(this,m3);
80	>	assertEquals(m3,a.get(this));
81
82		}
83	+	/**
84	+	* compareAndSet succeeds in changing value if equal to expected else fails
85	+	*/
86		public void testCompareAndSet(){
87	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
87	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
88	>	try {
89	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
90	>	} catch (RuntimeException ok) {
91	>	return;
92	>	}
93		x = one;
94		assertTrue(a.compareAndSet(this,one,two));
95		assertTrue(a.compareAndSet(this,two,m4));
#	Line 79 | Line 100 | public class AtomicReferenceFieldUpdater
100		assertEquals(seven,a.get(this));
101		}
102
103	+	/**
104	+	* compareAndSet in one thread enables another waiting for value
105	+	* to succeed
106	+	*/
107	+	public void testCompareAndSetInMultipleThreads() {
108	+	x = one;
109	+	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
110	+	try {
111	+	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
112	+	} catch (RuntimeException ok) {
113	+	return;
114	+	}
115	+
116	+	Thread t = new Thread(new Runnable() {
117	+	public void run() {
118	+	while(!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three)) Thread.yield();
119	+	}});
120	+	try {
121	+	t.start();
122	+	assertTrue(a.compareAndSet(this, one, two));
123	+	t.join(LONG_DELAY_MS);
124	+	assertFalse(t.isAlive());
125	+	assertEquals(a.get(this), three);
126	+	}
127	+	catch(Exception e) {
128	+	unexpectedException();
129	+	}
130	+	}
131	+
132	+	/**
133	+	* repeated weakCompareAndSet succeeds in changing value when equal
134	+	* to expected
135	+	*/
136		public void testWeakCompareAndSet(){
137	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
137	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
138	>	try {
139	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
140	>	} catch (RuntimeException ok) {
141	>	return;
142	>	}
143		x = one;
144		while(!a.weakCompareAndSet(this,one,two));
145		while(!a.weakCompareAndSet(this,two,m4));
#	Line 89 | Line 148 | public class AtomicReferenceFieldUpdater
148		assertEquals(seven,a.get(this));
149		}
150
151	+	/**
152	+	* getAndSet returns previous value and sets to given value
153	+	*/
154		public void testGetAndSet(){
155	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
155	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a;
156	>	try {
157	>	a = AtomicReferenceFieldUpdater.newUpdater(AtomicReferenceFieldUpdaterTest.class, Integer.class, "x");
158	>	} catch (RuntimeException ok) {
159	>	return;
160	>	}
161		x = one;
162		assertEquals(one,a.getAndSet(this, zero));
163		assertEquals(zero,a.getAndSet(this,m10));

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