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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 1.38 by dl, Tue Jan 26 13:33:05 2021 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 java.util.concurrent.atomic.*;
9	<	import junit.framework.*;
10	<	import java.util.*;
9	>	import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
10
11	<	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase{
12	<	volatile Integer x = null;
11	>	import junit.framework.Test;
12	>	import junit.framework.TestSuite;
13	>
14	>	public class AtomicReferenceFieldUpdaterTest extends JSR166TestCase {
15	>	volatile Item x = null;
16	>	protected volatile Item protectedField;
17	>	private volatile Item privateField;
18		Object z;
19	<	Integer w;
19	>	Item w;
20	>	volatile int i;
21
22	<	public static void main(String[] args){
23	<	junit.textui.TestRunner.run(suite());
22	>	public static void main(String[] args) {
23	>	main(suite(), args);
24		}
20	–
21	–
25		public static Test suite() {
26		return new TestSuite(AtomicReferenceFieldUpdaterTest.class);
27		}
28
29	<	public void testConstructor(){
30	<	try{
31	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
29	<	a = AtomicReferenceFieldUpdater.newUpdater
30	<	(getClass(), Integer.class, "y");
31	<	fail("Exception not thrown");
32	<	}
33	<
34	<	catch (RuntimeException rt) {}
29	>	static AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> updaterFor(String fieldName) {
30	>	return AtomicReferenceFieldUpdater.newUpdater
31	>	(AtomicReferenceFieldUpdaterTest.class, Item.class, fieldName);
32		}
33
34	<
35	<	public void testConstructor2(){
36	<	try{
37	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
38	<	a = AtomicReferenceFieldUpdater.newUpdater
39	<	(getClass(), Integer.class, "z");
40	<	fail("Exception not thrown");
34	>	/**
35	>	* Construction with non-existent field throws RuntimeException
36	>	*/
37	>	public void testConstructor() {
38	>	try {
39	>	updaterFor("y");
40	>	shouldThrow();
41	>	} catch (RuntimeException success) {
42	>	assertNotNull(success.getCause());
43		}
45	–
46	–	catch (RuntimeException rt) {}
44		}
45
46	<	public void testConstructor3(){
47	<	try{
48	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>
49	<	a = AtomicReferenceFieldUpdater.newUpdater
50	<	(getClass(), Integer.class, "w");
51	<	fail("Exception not thrown");
52	<	}
53	<
54	<	catch (RuntimeException rt) {}
46	>	/**
47	>	* construction with field not of given type throws ClassCastException
48	>	*/
49	>	public void testConstructor2() {
50	>	try {
51	>	updaterFor("z");
52	>	shouldThrow();
53	>	} catch (ClassCastException success) {}
54	>	}
55	>
56	>	/**
57	>	* Constructor with non-volatile field throws IllegalArgumentException
58	>	*/
59	>	public void testConstructor3() {
60	>	try {
61	>	updaterFor("w");
62	>	shouldThrow();
63	>	} catch (IllegalArgumentException success) {}
64	>	}
65	>
66	>	/**
67	>	* Constructor with non-reference field throws ClassCastException
68	>	*/
69	>	public void testConstructor4() {
70	>	try {
71	>	updaterFor("i");
72	>	shouldThrow();
73	>	} catch (ClassCastException success) {}
74	>	}
75	>
76	>	/**
77	>	* construction using private field from subclass throws RuntimeException
78	>	*/
79	>	public void testPrivateFieldInSubclass() {
80	>	new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
81	>	.checkPrivateAccess();
82	>	}
83	>
84	>	/**
85	>	* construction from unrelated class; package access is allowed,
86	>	* private access is not
87	>	*/
88	>	public void testUnrelatedClassAccess() {
89	>	new NonNestmates().checkPackageAccess(this);
90	>	new NonNestmates().checkPrivateAccess(this);
91	>	}
92	>
93	>	/**
94	>	* get returns the last value set or assigned
95	>	*/
96	>	public void testGetSet() {
97	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
98	>	a = updaterFor("x");
99	>	x = one;
100	>	assertSame(one, a.get(this));
101	>	a.set(this, two);
102	>	assertSame(two, a.get(this));
103	>	a.set(this, minusThree);
104	>	assertSame(minusThree, a.get(this));
105		}
106
107	<	public void testGetSet(){
108	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
107	>	/**
108	>	* get returns the last value lazySet by same thread
109	>	*/
110	>	public void testGetLazySet() {
111	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
112	>	a = updaterFor("x");
113		x = one;
114	<	assertEquals(one,a.get(this));
115	<	a.set(this,two);
116	<	assertEquals(two,a.get(this));
117	<	a.set(this,-3);
118	<	assertEquals(-3,a.get(this));
68	<
114	>	assertSame(one, a.get(this));
115	>	a.lazySet(this, two);
116	>	assertSame(two, a.get(this));
117	>	a.lazySet(this, minusThree);
118	>	assertSame(minusThree, a.get(this));
119		}
120	<	public void testCompareAndSet(){
121	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
120	>
121	>	/**
122	>	* compareAndSet succeeds in changing value if same as expected else fails
123	>	*/
124	>	public void testCompareAndSet() {
125	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
126	>	a = updaterFor("x");
127		x = one;
128	<	assertTrue(a.compareAndSet(this,one,two));
129	<	assertTrue(a.compareAndSet(this,two,m4));
130	<	assertEquals(m4,a.get(this));
131	<	assertFalse(a.compareAndSet(this,m5,seven));
132	<	assertFalse((seven == a.get(this)));
133	<	assertTrue(a.compareAndSet(this,m4,seven));
134	<	assertEquals(seven,a.get(this));
135	<	}
128	>	assertTrue(a.compareAndSet(this, one, two));
129	>	assertTrue(a.compareAndSet(this, two, minusFour));
130	>	assertSame(minusFour, a.get(this));
131	>	assertFalse(a.compareAndSet(this, minusFive, seven));
132	>	assertNotSame(seven, a.get(this));
133	>	assertTrue(a.compareAndSet(this, minusFour, seven));
134	>	assertSame(seven, a.get(this));
135	>	}
136	>
137	>	/**
138	>	* compareAndSet succeeds in changing protected field value if
139	>	* same as expected else fails
140	>	*/
141	>	public void testCompareAndSetProtectedInSubclass() {
142	>	new NonNestmates.AtomicReferenceFieldUpdaterTestSubclass()
143	>	.checkCompareAndSetProtectedSub();
144	>	}
145	>
146	>	/**
147	>	* compareAndSet in one thread enables another waiting for value
148	>	* to succeed
149	>	*/
150	>	public void testCompareAndSetInMultipleThreads() throws Exception {
151	>	x = one;
152	>	final AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
153	>	a = updaterFor("x");
154
155	<	public void testWeakCompareAndSet(){
156	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
155	>	Thread t = new Thread(new CheckedRunnable() {
156	>	public void realRun() {
157	>	while (!a.compareAndSet(AtomicReferenceFieldUpdaterTest.this, two, three))
158	>	Thread.yield();
159	>	}});
160	>
161	>	t.start();
162	>	assertTrue(a.compareAndSet(this, one, two));
163	>	t.join(LONG_DELAY_MS);
164	>	assertFalse(t.isAlive());
165	>	assertSame(three, a.get(this));
166	>	}
167	>
168	>	/**
169	>	* repeated weakCompareAndSet succeeds in changing value when same as expected
170	>	*/
171	>	public void testWeakCompareAndSet() {
172	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
173	>	a = updaterFor("x");
174		x = one;
175	<	while(!a.weakCompareAndSet(this,one,two));
176	<	while(!a.weakCompareAndSet(this,two,m4));
177	<	assertEquals(m4,a.get(this));
178	<	while(!a.weakCompareAndSet(this,m4,seven));
179	<	assertEquals(seven,a.get(this));
175	>	do {} while (!a.weakCompareAndSet(this, one, two));
176	>	do {} while (!a.weakCompareAndSet(this, two, minusFour));
177	>	assertSame(minusFour, a.get(this));
178	>	do {} while (!a.weakCompareAndSet(this, minusFour, seven));
179	>	assertSame(seven, a.get(this));
180		}
181
182	<	public void testGetAndSet(){
183	<	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Integer>a = AtomicReferenceFieldUpdater.newUpdater(getClass(), Integer.class, "x");
182	>	/**
183	>	* getAndSet returns previous value and sets to given value
184	>	*/
185	>	public void testGetAndSet() {
186	>	AtomicReferenceFieldUpdater<AtomicReferenceFieldUpdaterTest, Item> a;
187	>	a = updaterFor("x");
188		x = one;
189	<	assertEquals(one,a.getAndSet(this, zero));
190	<	assertEquals(zero,a.getAndSet(this,m10));
191	<	assertEquals(m10,a.getAndSet(this,1));
189	>	assertSame(one, a.getAndSet(this, zero));
190	>	assertSame(zero, a.getAndSet(this, minusTen));
191	>	assertSame(minusTen, a.getAndSet(this, one));
192		}
193
194		}

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