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

Comparing jsr166/src/test/tck/AtomicIntegerTest.java (file contents):
Revision 1.8 by dl, Fri Jan 9 20:07:36 2004 UTC vs.
Revision 1.33 by dl, Tue Jan 26 13:33:05 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
5	<	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	<	* Pat Fisher, Mike Judd.
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.AtomicInteger;
10	>
11	>	import junit.framework.Test;
12	>	import junit.framework.TestSuite;
13
14		public class AtomicIntegerTest 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(AtomicIntegerTest.class);
20		}
21
22	+	final int[] VALUES = {
23	+	Integer.MIN_VALUE, -1, 0, 1, 42, Integer.MAX_VALUE,
24	+	};
25	+
26		/**
27		* constructor initializes to given value
28		*/
29	<	public void testConstructor(){
29	>	public void testConstructor() {
30		AtomicInteger ai = new AtomicInteger(1);
31	<	assertEquals(1,ai.get());
31	>	assertEquals(1, ai.get());
32		}
33
34		/**
35		* default constructed initializes to zero
36		*/
37	<	public void testConstructor2(){
37	>	public void testConstructor2() {
38		AtomicInteger ai = new AtomicInteger();
39	<	assertEquals(0,ai.get());
39	>	assertEquals(0, ai.get());
40		}
41
42		/**
43		* get returns the last value set
44		*/
45	<	public void testGetSet(){
45	>	public void testGetSet() {
46		AtomicInteger ai = new AtomicInteger(1);
47	<	assertEquals(1,ai.get());
48	<	ai.set(2);
49	<	assertEquals(2,ai.get());
50	<	ai.set(-3);
51	<	assertEquals(-3,ai.get());
47	<
47	>	assertEquals(1, ai.get());
48	>	ai.set(2);
49	>	assertEquals(2, ai.get());
50	>	ai.set(-3);
51	>	assertEquals(-3, ai.get());
52		}
53	+
54	+	/**
55	+	* get returns the last value lazySet in same thread
56	+	*/
57	+	public void testGetLazySet() {
58	+	AtomicInteger ai = new AtomicInteger(1);
59	+	assertEquals(1, ai.get());
60	+	ai.lazySet(2);
61	+	assertEquals(2, ai.get());
62	+	ai.lazySet(-3);
63	+	assertEquals(-3, ai.get());
64	+	}
65	+
66		/**
67		* compareAndSet succeeds in changing value if equal to expected else fails
68		*/
69	<	public void testCompareAndSet(){
69	>	public void testCompareAndSet() {
70		AtomicInteger ai = new AtomicInteger(1);
71	<	assertTrue(ai.compareAndSet(1,2));
72	<	assertTrue(ai.compareAndSet(2,-4));
73	<	assertEquals(-4,ai.get());
74	<	assertFalse(ai.compareAndSet(-5,7));
75	<	assertFalse((7 == ai.get()));
76	<	assertTrue(ai.compareAndSet(-4,7));
77	<	assertEquals(7,ai.get());
71	>	assertTrue(ai.compareAndSet(1, 2));
72	>	assertTrue(ai.compareAndSet(2, -4));
73	>	assertEquals(-4, ai.get());
74	>	assertFalse(ai.compareAndSet(-5, 7));
75	>	assertEquals(-4, ai.get());
76	>	assertTrue(ai.compareAndSet(-4, 7));
77	>	assertEquals(7, ai.get());
78		}
79
80		/**
81		* compareAndSet in one thread enables another waiting for value
82		* to succeed
83		*/
84	<	public void testCompareAndSetInMultipleThreads() {
84	>	public void testCompareAndSetInMultipleThreads() throws Exception {
85		final AtomicInteger ai = new AtomicInteger(1);
86	<	Thread t = new Thread(new Runnable() {
87	<	public void run() {
88	<	while(!ai.compareAndSet(2, 3)) Thread.yield();
89	<	}});
90	<	try {
91	<	t.start();
92	<	assertTrue(ai.compareAndSet(1, 2));
93	<	t.join(LONG_DELAY_MS);
94	<	assertFalse(t.isAlive());
95	<	assertEquals(ai.get(), 3);
96	<	}
80	<	catch(Exception e) {
81	<	unexpectedException();
82	<	}
86	>	Thread t = new Thread(new CheckedRunnable() {
87	>	public void realRun() {
88	>	while (!ai.compareAndSet(2, 3))
89	>	Thread.yield();
90	>	}});
91	>
92	>	t.start();
93	>	assertTrue(ai.compareAndSet(1, 2));
94	>	t.join(LONG_DELAY_MS);
95	>	assertFalse(t.isAlive());
96	>	assertEquals(3, ai.get());
97		}
98
99		/**
100		* repeated weakCompareAndSet succeeds in changing value when equal
101	<	* to expected
101	>	* to expected
102		*/
103	<	public void testWeakCompareAndSet(){
103	>	@SuppressWarnings("deprecation")
104	>	public void testWeakCompareAndSet() {
105		AtomicInteger ai = new AtomicInteger(1);
106	<	while(!ai.weakCompareAndSet(1,2));
107	<	while(!ai.weakCompareAndSet(2,-4));
108	<	assertEquals(-4,ai.get());
109	<	while(!ai.weakCompareAndSet(-4,7));
110	<	assertEquals(7,ai.get());
106	>	do {} while (!ai.weakCompareAndSet(1, 2));
107	>	do {} while (!ai.weakCompareAndSet(2, -4));
108	>	assertEquals(-4, ai.get());
109	>	do {} while (!ai.weakCompareAndSet(-4, 7));
110	>	assertEquals(7, ai.get());
111		}
112
113		/**
114		* getAndSet returns previous value and sets to given value
115		*/
116	<	public void testGetAndSet(){
116	>	public void testGetAndSet() {
117		AtomicInteger ai = new AtomicInteger(1);
118	<	assertEquals(1,ai.getAndSet(0));
119	<	assertEquals(0,ai.getAndSet(-10));
120	<	assertEquals(-10,ai.getAndSet(1));
118	>	assertEquals(1, ai.getAndSet(0));
119	>	assertEquals(0, ai.getAndSet(-10));
120	>	assertEquals(-10, ai.getAndSet(1));
121		}
122
123		/**
124		* getAndAdd returns previous value and adds given value
125		*/
126	<	public void testGetAndAdd(){
126	>	public void testGetAndAdd() {
127		AtomicInteger ai = new AtomicInteger(1);
128	<	assertEquals(1,ai.getAndAdd(2));
129	<	assertEquals(3,ai.get());
130	<	assertEquals(3,ai.getAndAdd(-4));
131	<	assertEquals(-1,ai.get());
128	>	assertEquals(1, ai.getAndAdd(2));
129	>	assertEquals(3, ai.get());
130	>	assertEquals(3, ai.getAndAdd(-4));
131	>	assertEquals(-1, ai.get());
132		}
133
134		/**
135		* getAndDecrement returns previous value and decrements
136		*/
137	<	public void testGetAndDecrement(){
137	>	public void testGetAndDecrement() {
138		AtomicInteger ai = new AtomicInteger(1);
139	<	assertEquals(1,ai.getAndDecrement());
140	<	assertEquals(0,ai.getAndDecrement());
141	<	assertEquals(-1,ai.getAndDecrement());
139	>	assertEquals(1, ai.getAndDecrement());
140	>	assertEquals(0, ai.getAndDecrement());
141	>	assertEquals(-1, ai.getAndDecrement());
142		}
143
144		/**
145		* getAndIncrement returns previous value and increments
146		*/
147	<	public void testGetAndIncrement(){
147	>	public void testGetAndIncrement() {
148		AtomicInteger ai = new AtomicInteger(1);
149	<	assertEquals(1,ai.getAndIncrement());
150	<	assertEquals(2,ai.get());
151	<	ai.set(-2);
152	<	assertEquals(-2,ai.getAndIncrement());
153	<	assertEquals(-1,ai.getAndIncrement());
154	<	assertEquals(0,ai.getAndIncrement());
155	<	assertEquals(1,ai.get());
149	>	assertEquals(1, ai.getAndIncrement());
150	>	assertEquals(2, ai.get());
151	>	ai.set(-2);
152	>	assertEquals(-2, ai.getAndIncrement());
153	>	assertEquals(-1, ai.getAndIncrement());
154	>	assertEquals(0, ai.getAndIncrement());
155	>	assertEquals(1, ai.get());
156		}
157
158		/**
159		* addAndGet adds given value to current, and returns current value
160		*/
161	<	public void testAddAndGet(){
161	>	public void testAddAndGet() {
162		AtomicInteger ai = new AtomicInteger(1);
163	<	assertEquals(3,ai.addAndGet(2));
164	<	assertEquals(3,ai.get());
165	<	assertEquals(-1,ai.addAndGet(-4));
166	<	assertEquals(-1,ai.get());
163	>	assertEquals(3, ai.addAndGet(2));
164	>	assertEquals(3, ai.get());
165	>	assertEquals(-1, ai.addAndGet(-4));
166	>	assertEquals(-1, ai.get());
167		}
168
169		/**
170		* decrementAndGet decrements and returns current value
171		*/
172	<	public void testDecrementAndGet(){
172	>	public void testDecrementAndGet() {
173		AtomicInteger ai = new AtomicInteger(1);
174	<	assertEquals(0,ai.decrementAndGet());
175	<	assertEquals(-1,ai.decrementAndGet());
176	<	assertEquals(-2,ai.decrementAndGet());
177	<	assertEquals(-2,ai.get());
174	>	assertEquals(0, ai.decrementAndGet());
175	>	assertEquals(-1, ai.decrementAndGet());
176	>	assertEquals(-2, ai.decrementAndGet());
177	>	assertEquals(-2, ai.get());
178		}
179
180		/**
181		* incrementAndGet increments and returns current value
182		*/
183	<	public void testIncrementAndGet(){
183	>	public void testIncrementAndGet() {
184		AtomicInteger ai = new AtomicInteger(1);
185	<	assertEquals(2,ai.incrementAndGet());
186	<	assertEquals(2,ai.get());
187	<	ai.set(-2);
188	<	assertEquals(-1,ai.incrementAndGet());
189	<	assertEquals(0,ai.incrementAndGet());
190	<	assertEquals(1,ai.incrementAndGet());
191	<	assertEquals(1,ai.get());
185	>	assertEquals(2, ai.incrementAndGet());
186	>	assertEquals(2, ai.get());
187	>	ai.set(-2);
188	>	assertEquals(-1, ai.incrementAndGet());
189	>	assertEquals(0, ai.incrementAndGet());
190	>	assertEquals(1, ai.incrementAndGet());
191	>	assertEquals(1, ai.get());
192		}
193
194		/**
195	<	* a deserialized serialized atomic holds same value
196	<	*/
197	<	public void testSerialization() {
198	<	AtomicInteger l = new AtomicInteger();
199	<
200	<	try {
201	<	l.set(22);
202	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
203	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
204	<	out.writeObject(l);
205	<	out.close();
191	<
192	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
193	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
194	<	AtomicInteger r = (AtomicInteger) in.readObject();
195	<	assertEquals(l.get(), r.get());
196	<	} catch(Exception e){
197	<	unexpectedException();
198	<	}
195	>	* a deserialized/reserialized atomic holds same value
196	>	*/
197	>	public void testSerialization() throws Exception {
198	>	AtomicInteger x = new AtomicInteger();
199	>	AtomicInteger y = serialClone(x);
200	>	assertNotSame(x, y);
201	>	x.set(22);
202	>	AtomicInteger z = serialClone(x);
203	>	assertEquals(22, x.get());
204	>	assertEquals(0, y.get());
205	>	assertEquals(22, z.get());
206		}
207
208		/**
209		* toString returns current value.
210	<	*/
210	>	*/
211		public void testToString() {
212		AtomicInteger ai = new AtomicInteger();
213	<	for (int i = -12; i < 6; ++i) {
214	<	ai.set(i);
215	<	assertEquals(ai.toString(), Integer.toString(i));
213	>	assertEquals("0", ai.toString());
214	>	for (int x : VALUES) {
215	>	ai.set(x);
216	>	assertEquals(Integer.toString(x), ai.toString());
217	>	}
218	>	}
219	>
220	>	/**
221	>	* intValue returns current value.
222	>	*/
223	>	public void testIntValue() {
224	>	AtomicInteger ai = new AtomicInteger();
225	>	assertEquals(0, ai.intValue());
226	>	for (int x : VALUES) {
227	>	ai.set(x);
228	>	assertEquals(x, ai.intValue());
229	>	}
230	>	}
231	>
232	>	/**
233	>	* longValue returns current value.
234	>	*/
235	>	public void testLongValue() {
236	>	AtomicInteger ai = new AtomicInteger();
237	>	assertEquals(0L, ai.longValue());
238	>	for (int x : VALUES) {
239	>	ai.set(x);
240	>	assertEquals((long)x, ai.longValue());
241	>	}
242	>	}
243	>
244	>	/**
245	>	* floatValue returns current value.
246	>	*/
247	>	public void testFloatValue() {
248	>	AtomicInteger ai = new AtomicInteger();
249	>	assertEquals(0.0f, ai.floatValue());
250	>	for (int x : VALUES) {
251	>	ai.set(x);
252	>	assertEquals((float)x, ai.floatValue());
253	>	}
254	>	}
255	>
256	>	/**
257	>	* doubleValue returns current value.
258	>	*/
259	>	public void testDoubleValue() {
260	>	AtomicInteger ai = new AtomicInteger();
261	>	assertEquals(0.0d, ai.doubleValue());
262	>	for (int x : VALUES) {
263	>	ai.set(x);
264	>	assertEquals((double)x, ai.doubleValue());
265		}
266		}
267

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