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

Comparing jsr166/src/test/tck/AtomicReferenceTest.java (file contents):
Revision 1.10 by jsr166, Mon Nov 16 04:57:10 2009 UTC vs.
Revision 1.31 by jsr166, Wed Jan 27 01:57:24 2021 UTC

#	Line 1 | Line 1
1		/*
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
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 junit.framework.*;
10	<	import java.util.concurrent.atomic.*;
11	<	import java.io.*;
9	>	import java.util.concurrent.atomic.AtomicReference;
10	>
11	>	import junit.framework.Test;
12	>	import junit.framework.TestSuite;
13
14		public class AtomicReferenceTest extends JSR166TestCase {
15	<	public static void main (String[] args) {
16	<	junit.textui.TestRunner.run (suite());
15	>	public static void main(String[] args) {
16	>	main(suite(), args);
17		}
18		public static Test suite() {
19		return new TestSuite(AtomicReferenceTest.class);
#	Line 21 | Line 22 | public class AtomicReferenceTest extends
22		/**
23		* constructor initializes to given value
24		*/
25	<	public void testConstructor(){
26	<	AtomicReference ai = new AtomicReference(one);
27	<	assertEquals(one,ai.get());
25	>	public void testConstructor() {
26	>	AtomicReference<Item> ai = new AtomicReference<>(one);
27	>	assertSame(one, ai.get());
28		}
29
30		/**
31		* default constructed initializes to null
32		*/
33	<	public void testConstructor2(){
34	<	AtomicReference ai = new AtomicReference();
35	<	assertNull(ai.get());
33	>	public void testConstructor2() {
34	>	AtomicReference<Item> ai = new AtomicReference<>();
35	>	assertNull(ai.get());
36		}
37
38		/**
39		* get returns the last value set
40		*/
41	<	public void testGetSet(){
42	<	AtomicReference ai = new AtomicReference(one);
43	<	assertEquals(one,ai.get());
44	<	ai.set(two);
45	<	assertEquals(two,ai.get());
46	<	ai.set(m3);
47	<	assertEquals(m3,ai.get());
41	>	public void testGetSet() {
42	>	AtomicReference<Item> ai = new AtomicReference<>(one);
43	>	assertSame(one, ai.get());
44	>	ai.set(two);
45	>	assertSame(two, ai.get());
46	>	ai.set(minusThree);
47	>	assertSame(minusThree, ai.get());
48		}
49
50		/**
51		* get returns the last value lazySet in same thread
52		*/
53	<	public void testGetLazySet(){
54	<	AtomicReference ai = new AtomicReference(one);
55	<	assertEquals(one,ai.get());
56	<	ai.lazySet(two);
57	<	assertEquals(two,ai.get());
58	<	ai.lazySet(m3);
59	<	assertEquals(m3,ai.get());
53	>	public void testGetLazySet() {
54	>	AtomicReference<Item> ai = new AtomicReference<>(one);
55	>	assertSame(one, ai.get());
56	>	ai.lazySet(two);
57	>	assertSame(two, ai.get());
58	>	ai.lazySet(minusThree);
59	>	assertSame(minusThree, ai.get());
60		}
61
62		/**
63		* compareAndSet succeeds in changing value if equal to expected else fails
64		*/
65	<	public void testCompareAndSet(){
66	<	AtomicReference ai = new AtomicReference(one);
67	<	assertTrue(ai.compareAndSet(one,two));
68	<	assertTrue(ai.compareAndSet(two,m4));
69	<	assertEquals(m4,ai.get());
70	<	assertFalse(ai.compareAndSet(m5,seven));
71	<	assertFalse((seven.equals(ai.get())));
72	<	assertTrue(ai.compareAndSet(m4,seven));
73	<	assertEquals(seven,ai.get());
65	>	public void testCompareAndSet() {
66	>	AtomicReference<Item> ai = new AtomicReference<>(one);
67	>	assertTrue(ai.compareAndSet(one, two));
68	>	assertTrue(ai.compareAndSet(two, minusFour));
69	>	assertSame(minusFour, ai.get());
70	>	assertFalse(ai.compareAndSet(minusFive, seven));
71	>	assertSame(minusFour, ai.get());
72	>	assertTrue(ai.compareAndSet(minusFour, seven));
73	>	assertSame(seven, ai.get());
74		}
75
76		/**
77		* compareAndSet in one thread enables another waiting for value
78		* to succeed
79		*/
80	<	public void testCompareAndSetInMultipleThreads() {
81	<	final AtomicReference ai = new AtomicReference(one);
82	<	Thread t = new Thread(new Runnable() {
83	<	public void run() {
84	<	while (!ai.compareAndSet(two, three)) Thread.yield();
85	<	}});
86	<	try {
87	<	t.start();
88	<	assertTrue(ai.compareAndSet(one, two));
89	<	t.join(LONG_DELAY_MS);
90	<	assertFalse(t.isAlive());
91	<	assertEquals(ai.get(), three);
92	<	}
92	<	catch (Exception e) {
93	<	unexpectedException();
94	<	}
80	>	public void testCompareAndSetInMultipleThreads() throws Exception {
81	>	final AtomicReference<Item> ai = new AtomicReference<>(one);
82	>	Thread t = new Thread(new CheckedRunnable() {
83	>	public void realRun() {
84	>	while (!ai.compareAndSet(two, three))
85	>	Thread.yield();
86	>	}});
87	>
88	>	t.start();
89	>	assertTrue(ai.compareAndSet(one, two));
90	>	t.join(LONG_DELAY_MS);
91	>	assertFalse(t.isAlive());
92	>	assertSame(three, ai.get());
93		}
94
95		/**
96		* repeated weakCompareAndSet succeeds in changing value when equal
97		* to expected
98		*/
99	<	public void testWeakCompareAndSet(){
100	<	AtomicReference ai = new AtomicReference(one);
101	<	while (!ai.weakCompareAndSet(one,two));
102	<	while (!ai.weakCompareAndSet(two,m4));
103	<	assertEquals(m4,ai.get());
104	<	while (!ai.weakCompareAndSet(m4,seven));
105	<	assertEquals(seven,ai.get());
99	>	@SuppressWarnings("deprecation")
100	>	public void testWeakCompareAndSet() {
101	>	AtomicReference<Item> ai = new AtomicReference<>(one);
102	>	do {} while (!ai.weakCompareAndSet(one, two));
103	>	do {} while (!ai.weakCompareAndSet(two, minusFour));
104	>	assertSame(minusFour, ai.get());
105	>	do {} while (!ai.weakCompareAndSet(minusFour, seven));
106	>	assertSame(seven, ai.get());
107		}
108
109		/**
110		* getAndSet returns previous value and sets to given value
111		*/
112	<	public void testGetAndSet(){
113	<	AtomicReference ai = new AtomicReference(one);
114	<	assertEquals(one,ai.getAndSet(zero));
115	<	assertEquals(zero,ai.getAndSet(m10));
116	<	assertEquals(m10,ai.getAndSet(one));
112	>	public void testGetAndSet() {
113	>	AtomicReference<Item> ai = new AtomicReference<>(one);
114	>	assertSame(one, ai.getAndSet(zero));
115	>	assertSame(zero, ai.getAndSet(minusTen));
116	>	assertSame(minusTen, ai.getAndSet(one));
117		}
118
119		/**
120	<	* a deserialized serialized atomic holds same value
121	<	*/
122	<	public void testSerialization() {
123	<	AtomicReference l = new AtomicReference();
124	<
125	<	try {
126	<	l.set(one);
127	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
128	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
129	<	out.writeObject(l);
130	<	out.close();
131	<
133	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
134	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
135	<	AtomicReference r = (AtomicReference) in.readObject();
136	<	assertEquals(l.get(), r.get());
137	<	} catch (Exception e){
138	<	unexpectedException();
139	<	}
120	>	* a deserialized/reserialized atomic holds same value
121	>	*/
122	>	public void testSerialization() throws Exception {
123	>	AtomicReference<Item> x = new AtomicReference<>();
124	>	AtomicReference<Item> y = serialClone(x);
125	>	assertNotSame(x, y);
126	>	x.set(one);
127	>	AtomicReference<Item> z = serialClone(x);
128	>	assertNotSame(y, z);
129	>	assertEquals(one, x.get());
130	>	assertNull(y.get());
131	>	assertEquals(one, z.get());
132		}
133
134		/**
135		* toString returns current value.
136		*/
137		public void testToString() {
138	<	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
139	<	assertEquals(ai.toString(), one.toString());
138	>	AtomicReference<Item> ai = new AtomicReference<>(one);
139	>	assertEquals(one.toString(), ai.toString());
140		ai.set(two);
141	<	assertEquals(ai.toString(), two.toString());
141	>	assertEquals(two.toString(), ai.toString());
142		}
143
144		}

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