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

Comparing jsr166/src/test/tck/AtomicReferenceTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.31 by jsr166, Wed Jan 27 01:57:24 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 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);
20		}
21
22	<	public void testConstructor(){
23	<	AtomicReference ai = new AtomicReference(one);
24	<	assertEquals(one,ai.get());
25	<	}
26	<
27	<	public void testConstructor2(){
28	<	AtomicReference ai = new AtomicReference();
29	<	assertNull(ai.get());
30	<	}
31	<
32	<	public void testGetSet(){
33	<	AtomicReference ai = new AtomicReference(one);
34	<	assertEquals(one,ai.get());
35	<	ai.set(two);
36	<	assertEquals(two,ai.get());
37	<	ai.set(m3);
38	<	assertEquals(m3,ai.get());
39	<
40	<	}
41	<	public void testCompareAndSet(){
42	<	AtomicReference ai = new AtomicReference(one);
43	<	assertTrue(ai.compareAndSet(one,two));
44	<	assertTrue(ai.compareAndSet(two,m4));
45	<	assertEquals(m4,ai.get());
46	<	assertFalse(ai.compareAndSet(m5,seven));
47	<	assertFalse((seven.equals(ai.get())));
48	<	assertTrue(ai.compareAndSet(m4,seven));
49	<	assertEquals(seven,ai.get());
50	<	}
51	<
52	<	public void testWeakCompareAndSet(){
53	<	AtomicReference ai = new AtomicReference(one);
54	<	while(!ai.weakCompareAndSet(one,two));
55	<	while(!ai.weakCompareAndSet(two,m4));
56	<	assertEquals(m4,ai.get());
57	<	while(!ai.weakCompareAndSet(m4,seven));
58	<	assertEquals(seven,ai.get());
59	<	}
60	<
61	<	public void testGetAndSet(){
62	<	AtomicReference ai = new AtomicReference(one);
63	<	assertEquals(one,ai.getAndSet(zero));
64	<	assertEquals(zero,ai.getAndSet(m10));
65	<	assertEquals(m10,ai.getAndSet(one));
66	<	}
67	<
68	<	public void testSerialization() {
69	<	AtomicReference l = new AtomicReference();
70	<
71	<	try {
72	<	l.set(one);
73	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
74	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
75	<	out.writeObject(l);
76	<	out.close();
77	<
78	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
79	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
80	<	AtomicReference r = (AtomicReference) in.readObject();
81	<	assertEquals(l.get(), r.get());
82	<	} catch(Exception e){
83	<	e.printStackTrace();
84	<	fail("unexpected exception");
85	<	}
22	>	/**
23	>	* constructor initializes to given value
24	>	*/
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<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<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<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<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() 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	>	@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<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/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<Item> ai = new AtomicReference<>(one);
139	>	assertEquals(one.toString(), ai.toString());
140	>	ai.set(two);
141	>	assertEquals(two.toString(), ai.toString());
142		}
143
144		}
87	–

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