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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 1.21 by jsr166, Thu May 30 03:28:55 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
9		import junit.framework.*;
10	<	import java.util.concurrent.atomic.*;
10	<	import java.io.*;
10	>	import java.util.concurrent.atomic.AtomicReference;
11
12		public class AtomicReferenceTest extends JSR166TestCase {
13	<	public static void main (String[] args) {
14	<	junit.textui.TestRunner.run (suite());
13	>	public static void main(String[] args) {
14	>	junit.textui.TestRunner.run(suite());
15		}
16		public static Test suite() {
17		return new TestSuite(AtomicReferenceTest.class);
18		}
19
20	<	public void testConstructor(){
20	>	/**
21	>	* constructor initializes to given value
22	>	*/
23	>	public void testConstructor() {
24		AtomicReference ai = new AtomicReference(one);
25	<	assertEquals(one,ai.get());
25	>	assertSame(one, ai.get());
26		}
27
28	<	public void testConstructor2(){
28	>	/**
29	>	* default constructed initializes to null
30	>	*/
31	>	public void testConstructor2() {
32		AtomicReference ai = new AtomicReference();
33	<	assertNull(ai.get());
33	>	assertNull(ai.get());
34		}
35
36	<	public void testGetSet(){
36	>	/**
37	>	* get returns the last value set
38	>	*/
39	>	public void testGetSet() {
40		AtomicReference ai = new AtomicReference(one);
41	<	assertEquals(one,ai.get());
42	<	ai.set(two);
43	<	assertEquals(two,ai.get());
44	<	ai.set(m3);
45	<	assertEquals(m3,ai.get());
37	<
38	<	}
39	<	public void testCompareAndSet(){
40	<	AtomicReference ai = new AtomicReference(one);
41	<	assertTrue(ai.compareAndSet(one,two));
42	<	assertTrue(ai.compareAndSet(two,m4));
43	<	assertEquals(m4,ai.get());
44	<	assertFalse(ai.compareAndSet(m5,seven));
45	<	assertFalse((seven.equals(ai.get())));
46	<	assertTrue(ai.compareAndSet(m4,seven));
47	<	assertEquals(seven,ai.get());
41	>	assertSame(one, ai.get());
42	>	ai.set(two);
43	>	assertSame(two, ai.get());
44	>	ai.set(m3);
45	>	assertSame(m3, ai.get());
46		}
47
48	<	public void testWeakCompareAndSet(){
48	>	/**
49	>	* get returns the last value lazySet in same thread
50	>	*/
51	>	public void testGetLazySet() {
52		AtomicReference ai = new AtomicReference(one);
53	<	while(!ai.weakCompareAndSet(one,two));
54	<	while(!ai.weakCompareAndSet(two,m4));
55	<	assertEquals(m4,ai.get());
56	<	while(!ai.weakCompareAndSet(m4,seven));
57	<	assertEquals(seven,ai.get());
53	>	assertSame(one, ai.get());
54	>	ai.lazySet(two);
55	>	assertSame(two, ai.get());
56	>	ai.lazySet(m3);
57	>	assertSame(m3, ai.get());
58		}
59
60	<	public void testGetAndSet(){
60	>	/**
61	>	* compareAndSet succeeds in changing value if equal to expected else fails
62	>	*/
63	>	public void testCompareAndSet() {
64		AtomicReference ai = new AtomicReference(one);
65	<	assertEquals(one,ai.getAndSet(zero));
66	<	assertEquals(zero,ai.getAndSet(m10));
67	<	assertEquals(m10,ai.getAndSet(one));
65	>	assertTrue(ai.compareAndSet(one, two));
66	>	assertTrue(ai.compareAndSet(two, m4));
67	>	assertSame(m4, ai.get());
68	>	assertFalse(ai.compareAndSet(m5, seven));
69	>	assertSame(m4, ai.get());
70	>	assertTrue(ai.compareAndSet(m4, seven));
71	>	assertSame(seven, ai.get());
72	>	}
73	>
74	>	/**
75	>	* compareAndSet in one thread enables another waiting for value
76	>	* to succeed
77	>	*/
78	>	public void testCompareAndSetInMultipleThreads() throws Exception {
79	>	final AtomicReference ai = new AtomicReference(one);
80	>	Thread t = new Thread(new CheckedRunnable() {
81	>	public void realRun() {
82	>	while (!ai.compareAndSet(two, three))
83	>	Thread.yield();
84	>	}});
85	>
86	>	t.start();
87	>	assertTrue(ai.compareAndSet(one, two));
88	>	t.join(LONG_DELAY_MS);
89	>	assertFalse(t.isAlive());
90	>	assertSame(three, ai.get());
91	>	}
92	>
93	>	/**
94	>	* repeated weakCompareAndSet succeeds in changing value when equal
95	>	* to expected
96	>	*/
97	>	public void testWeakCompareAndSet() {
98	>	AtomicReference ai = new AtomicReference(one);
99	>	while (!ai.weakCompareAndSet(one, two));
100	>	while (!ai.weakCompareAndSet(two, m4));
101	>	assertSame(m4, ai.get());
102	>	while (!ai.weakCompareAndSet(m4, seven));
103	>	assertSame(seven, ai.get());
104		}
105
106	<	public void testSerialization() {
107	<	AtomicReference l = new AtomicReference();
108	<
109	<	try {
110	<	l.set(one);
111	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
112	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
113	<	out.writeObject(l);
114	<	out.close();
115	<
116	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
117	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
118	<	AtomicReference r = (AtomicReference) in.readObject();
119	<	assertEquals(l.get(), r.get());
120	<	} catch(Exception e){
121	<	e.printStackTrace();
122	<	fail("unexpected exception");
123	<	}
106	>	/**
107	>	* getAndSet returns previous value and sets to given value
108	>	*/
109	>	public void testGetAndSet() {
110	>	AtomicReference ai = new AtomicReference(one);
111	>	assertSame(one, ai.getAndSet(zero));
112	>	assertSame(zero, ai.getAndSet(m10));
113	>	assertSame(m10, ai.getAndSet(one));
114	>	}
115	>
116	>	/**
117	>	* a deserialized serialized atomic holds same value
118	>	*/
119	>	public void testSerialization() throws Exception {
120	>	AtomicReference x = new AtomicReference();
121	>	AtomicReference y = serialClone(x);
122	>	assertNotSame(x, y);
123	>	x.set(one);
124	>	AtomicReference z = serialClone(x);
125	>	assertNotSame(y, z);
126	>	assertEquals(one, x.get());
127	>	assertEquals(null, y.get());
128	>	assertEquals(one, z.get());
129	>	}
130	>
131	>	/**
132	>	* toString returns current value.
133	>	*/
134	>	public void testToString() {
135	>	AtomicReference<Integer> ai = new AtomicReference<Integer>(one);
136	>	assertEquals(one.toString(), ai.toString());
137	>	ai.set(two);
138	>	assertEquals(two.toString(), ai.toString());
139		}
140
141		}
87	–

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