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

Comparing jsr166/src/test/tck/CountDownLatchTest.java (file contents):
Revision 1.3 by dl, Sat Sep 20 18:20:07 2003 UTC vs.
Revision 1.20 by jsr166, Sat May 28 12:37:00 2011 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.*;
11		import java.util.concurrent.*;
12	+	import static java.util.concurrent.TimeUnit.MILLISECONDS;
13
14		public class CountDownLatchTest extends JSR166TestCase {
15		public static void main(String[] args) {
16	<	junit.textui.TestRunner.run (suite());
16	>	junit.textui.TestRunner.run(suite());
17		}
18		public static Test suite() {
19	<	return new TestSuite(CountDownLatchTest.class);
19	>	return new TestSuite(CountDownLatchTest.class);
20		}
21
22		/**
23	<	*
23	>	* negative constructor argument throws IAE
24		*/
25		public void testConstructor() {
26		try {
27		new CountDownLatch(-1);
28		shouldThrow();
29	<	} catch(IllegalArgumentException success){}
29	>	} catch (IllegalArgumentException success) {}
30		}
31
32		/**
33	<	*
33	>	* getCount returns initial count and decreases after countDown
34		*/
35		public void testGetCount() {
36	<	final CountDownLatch l = new CountDownLatch(2);
37	<	assertEquals(2, l.getCount());
38	<	l.countDown();
39	<	assertEquals(1, l.getCount());
36	>	final CountDownLatch l = new CountDownLatch(2);
37	>	assertEquals(2, l.getCount());
38	>	l.countDown();
39	>	assertEquals(1, l.getCount());
40		}
41
42		/**
43	<	*
43	>	* countDown decrements count when positive and has no effect when zero
44	>	*/
45	>	public void testCountDown() {
46	>	final CountDownLatch l = new CountDownLatch(1);
47	>	assertEquals(1, l.getCount());
48	>	l.countDown();
49	>	assertEquals(0, l.getCount());
50	>	l.countDown();
51	>	assertEquals(0, l.getCount());
52	>	}
53	>
54	>	/**
55	>	* await returns after countDown to zero, but not before
56		*/
57		public void testAwait() {
58	<	final CountDownLatch l = new CountDownLatch(2);
58	>	final CountDownLatch l = new CountDownLatch(2);
59	>	final CountDownLatch pleaseCountDown = new CountDownLatch(1);
60
61	<	Thread t = new Thread(new Runnable() {
62	<	public void run() {
63	<	try {
64	<	l.await();
65	<	} catch(InterruptedException e){
66	<	threadUnexpectedException();
67	<	}
68	<	}
69	<	});
70	<	t.start();
71	<	try {
72	<	assertEquals(l.getCount(), 2);
73	<	Thread.sleep(SHORT_DELAY_MS);
74	<	l.countDown();
75	<	assertEquals(l.getCount(), 1);
76	<	l.countDown();
62	<	assertEquals(l.getCount(), 0);
63	<	t.join();
64	<	} catch (InterruptedException e){
65	<	unexpectedException();
66	<	}
61	>	Thread t = newStartedThread(new CheckedRunnable() {
62	>	public void realRun() throws InterruptedException {
63	>	assertEquals(2, l.getCount());
64	>	pleaseCountDown.countDown();
65	>	l.await();
66	>	assertEquals(0, l.getCount());
67	>	}});
68	>
69	>	await(pleaseCountDown);
70	>	assertEquals(2, l.getCount());
71	>	l.countDown();
72	>	assertEquals(1, l.getCount());
73	>	assertThreadStaysAlive(t);
74	>	l.countDown();
75	>	assertEquals(0, l.getCount());
76	>	awaitTermination(t);
77		}
68	–
78
79		/**
80	<	*
80	>	* timed await returns after countDown to zero
81		*/
82		public void testTimedAwait() {
83	<	final CountDownLatch l = new CountDownLatch(2);
83	>	final CountDownLatch l = new CountDownLatch(2);
84	>	final CountDownLatch pleaseCountDown = new CountDownLatch(1);
85
86	<	Thread t = new Thread(new Runnable() {
87	<	public void run() {
88	<	try {
89	<	threadAssertTrue(l.await(SMALL_DELAY_MS, TimeUnit.MILLISECONDS));
90	<	} catch(InterruptedException e){
91	<	threadUnexpectedException();
92	<	}
93	<	}
94	<	});
95	<	t.start();
96	<	try {
97	<	assertEquals(l.getCount(), 2);
98	<	Thread.sleep(SHORT_DELAY_MS);
99	<	l.countDown();
100	<	assertEquals(l.getCount(), 1);
101	<	l.countDown();
92	<	assertEquals(l.getCount(), 0);
93	<	t.join();
94	<	} catch (InterruptedException e){
95	<	unexpectedException();
96	<	}
86	>	Thread t = newStartedThread(new CheckedRunnable() {
87	>	public void realRun() throws InterruptedException {
88	>	assertEquals(2, l.getCount());
89	>	pleaseCountDown.countDown();
90	>	assertTrue(l.await(LONG_DELAY_MS, MILLISECONDS));
91	>	assertEquals(0, l.getCount());
92	>	}});
93	>
94	>	await(pleaseCountDown);
95	>	assertEquals(2, l.getCount());
96	>	l.countDown();
97	>	assertEquals(1, l.getCount());
98	>	assertThreadStaysAlive(t);
99	>	l.countDown();
100	>	assertEquals(0, l.getCount());
101	>	awaitTermination(t);
102		}
98	–
99	–
100	–
103
104		/**
105	<	*
105	>	* await throws IE if interrupted before counted down
106		*/
107	<	public void testAwait_InterruptedException() {
107	>	public void testAwait_Interruptible() {
108		final CountDownLatch l = new CountDownLatch(1);
109	<	Thread t = new Thread(new Runnable() {
110	<	public void run() {
111	<	try {
112	<	l.await();
113	<	threadShouldThrow();
114	<	} catch(InterruptedException success){}
115	<	}
116	<	});
117	<	t.start();
118	<	try {
119	<	assertEquals(l.getCount(), 1);
120	<	t.interrupt();
121	<	t.join();
122	<	} catch (InterruptedException e){
123	<	unexpectedException();
124	<	}
109	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
110	>	Thread t = newStartedThread(new CheckedRunnable() {
111	>	public void realRun() throws InterruptedException {
112	>	Thread.currentThread().interrupt();
113	>	try {
114	>	l.await();
115	>	shouldThrow();
116	>	} catch (InterruptedException success) {}
117	>	assertFalse(Thread.interrupted());
118	>
119	>	pleaseInterrupt.countDown();
120	>	try {
121	>	l.await();
122	>	shouldThrow();
123	>	} catch (InterruptedException success) {}
124	>	assertFalse(Thread.interrupted());
125	>
126	>	assertEquals(1, l.getCount());
127	>	}});
128	>
129	>	await(pleaseInterrupt);
130	>	assertThreadStaysAlive(t);
131	>	t.interrupt();
132	>	awaitTermination(t);
133		}
134
135		/**
136	<	*
136	>	* timed await throws IE if interrupted before counted down
137		*/
138	<	public void testTimedAwait_InterruptedException() {
138	>	public void testTimedAwait_Interruptible() {
139		final CountDownLatch l = new CountDownLatch(1);
140	<	Thread t = new Thread(new Runnable() {
141	<	public void run() {
142	<	try {
143	<	l.await(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS);
144	<	threadShouldThrow();
145	<	} catch(InterruptedException success){}
146	<	}
147	<	});
148	<	t.start();
149	<	try {
150	<	Thread.sleep(SHORT_DELAY_MS);
151	<	assertEquals(l.getCount(), 1);
152	<	t.interrupt();
153	<	t.join();
154	<	} catch (InterruptedException e){
155	<	unexpectedException();
156	<	}
140	>	final CountDownLatch pleaseInterrupt = new CountDownLatch(1);
141	>	Thread t = newStartedThread(new CheckedRunnable() {
142	>	public void realRun() throws InterruptedException {
143	>	Thread.currentThread().interrupt();
144	>	try {
145	>	l.await(LONG_DELAY_MS, MILLISECONDS);
146	>	shouldThrow();
147	>	} catch (InterruptedException success) {}
148	>	assertFalse(Thread.interrupted());
149	>
150	>	pleaseInterrupt.countDown();
151	>	try {
152	>	l.await(LONG_DELAY_MS, MILLISECONDS);
153	>	shouldThrow();
154	>	} catch (InterruptedException success) {}
155	>	assertFalse(Thread.interrupted());
156	>
157	>	assertEquals(1, l.getCount());
158	>	}});
159	>
160	>	await(pleaseInterrupt);
161	>	assertThreadStaysAlive(t);
162	>	t.interrupt();
163	>	awaitTermination(t);
164		}
165
166		/**
167	<	*
167	>	* timed await times out if not counted down before timeout
168		*/
169	<	public void testAwaitTimeout() {
169	>	public void testAwaitTimeout() throws InterruptedException {
170		final CountDownLatch l = new CountDownLatch(1);
171	<	Thread t = new Thread(new Runnable() {
172	<	public void run() {
173	<	try {
174	<	threadAssertFalse(l.await(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
175	<	} catch(InterruptedException ie){
176	<	threadUnexpectedException();
177	<	}
178	<	}
179	<	});
180	<	t.start();
181	<	try {
182	<	assertEquals(l.getCount(), 1);
183	<	t.join();
184	<	} catch (InterruptedException e){
185	<	unexpectedException();
186	<	}
171	>	Thread t = newStartedThread(new CheckedRunnable() {
172	>	public void realRun() throws InterruptedException {
173	>	assertEquals(1, l.getCount());
174	>	assertFalse(l.await(timeoutMillis(), MILLISECONDS));
175	>	assertEquals(1, l.getCount());
176	>	}});
177	>
178	>	awaitTermination(t);
179	>	assertEquals(1, l.getCount());
180	>	}
181	>
182	>	/**
183	>	* toString indicates current count
184	>	*/
185	>	public void testToString() {
186	>	CountDownLatch s = new CountDownLatch(2);
187	>	assertTrue(s.toString().contains("Count = 2"));
188	>	s.countDown();
189	>	assertTrue(s.toString().contains("Count = 1"));
190	>	s.countDown();
191	>	assertTrue(s.toString().contains("Count = 0"));
192		}
193
194		}

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