1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* Copyright (C) 2008 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.testing;
import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import junit.framework.TestCase;
import java.util.EnumSet;
import java.util.concurrent.Callable;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
/**
* Unit test for {@link FakeTicker}.
*
* @author Jige Yu
*/
@GwtCompatible(emulated = true)
public class FakeTickerTest extends TestCase {
@GwtIncompatible("NullPointerTester")
public void testNullPointerExceptions() {
NullPointerTester tester = new NullPointerTester();
tester.testAllPublicInstanceMethods(new FakeTicker());
}
public void testAdvance() {
FakeTicker ticker = new FakeTicker();
assertEquals(0, ticker.read());
assertSame(ticker, ticker.advance(10));
assertEquals(10, ticker.read());
ticker.advance(1, TimeUnit.MILLISECONDS);
assertEquals(1000010L, ticker.read());
}
public void testAutoIncrementStep_returnsSameInstance() {
FakeTicker ticker = new FakeTicker();
assertSame(ticker, ticker.setAutoIncrementStep(10, TimeUnit.NANOSECONDS));
}
public void testAutoIncrementStep_nanos() {
FakeTicker ticker = new FakeTicker().setAutoIncrementStep(10, TimeUnit.NANOSECONDS);
assertEquals(0, ticker.read());
assertEquals(10, ticker.read());
assertEquals(20, ticker.read());
}
public void testAutoIncrementStep_millis() {
FakeTicker ticker = new FakeTicker().setAutoIncrementStep(1, TimeUnit.MILLISECONDS);
assertEquals(0, ticker.read());
assertEquals(1000000, ticker.read());
assertEquals(2000000, ticker.read());
}
public void testAutoIncrementStep_seconds() {
FakeTicker ticker = new FakeTicker().setAutoIncrementStep(3, TimeUnit.SECONDS);
assertEquals(0, ticker.read());
assertEquals(3000000000L, ticker.read());
assertEquals(6000000000L, ticker.read());
}
public void testAutoIncrementStep_resetToZero() {
FakeTicker ticker = new FakeTicker().setAutoIncrementStep(10, TimeUnit.NANOSECONDS);
assertEquals(0, ticker.read());
assertEquals(10, ticker.read());
assertEquals(20, ticker.read());
for (TimeUnit timeUnit : EnumSet.allOf(TimeUnit.class)) {
ticker.setAutoIncrementStep(0, timeUnit);
assertEquals(
"Expected no auto-increment when setting autoIncrementStep to 0 " + timeUnit,
30, ticker.read());
}
}
public void testAutoIncrement_negative() {
FakeTicker ticker = new FakeTicker();
try {
ticker.setAutoIncrementStep(-1, TimeUnit.NANOSECONDS);
fail("Expected IllegalArgumentException");
} catch (IllegalArgumentException expected) {
}
}
@GwtIncompatible("concurrency")
public void testConcurrentAdvance() throws Exception {
final FakeTicker ticker = new FakeTicker();
int numberOfThreads = 64;
runConcurrentTest(numberOfThreads,
new Callable<Void>() {
@Override
public Void call() throws Exception {
// adds two nanoseconds to the ticker
ticker.advance(1L);
Thread.sleep(10);
ticker.advance(1L);
return null;
}
});
assertEquals(numberOfThreads * 2, ticker.read());
}
@GwtIncompatible("concurrency")
public void testConcurrentAutoIncrementStep() throws Exception {
int incrementByNanos = 3;
final FakeTicker ticker =
new FakeTicker().setAutoIncrementStep(incrementByNanos, TimeUnit.NANOSECONDS);
int numberOfThreads = 64;
runConcurrentTest(numberOfThreads,
new Callable<Void>() {
@Override
public Void call() throws Exception {
ticker.read();
return null;
}
});
assertEquals(incrementByNanos * numberOfThreads, ticker.read());
}
/**
* Runs {@code callable} concurrently {@code numberOfThreads} times.
*/
@GwtIncompatible("concurrency")
private void runConcurrentTest(int numberOfThreads, final Callable<Void> callable)
throws Exception {
ExecutorService executorService = Executors.newFixedThreadPool(numberOfThreads);
final CountDownLatch startLatch = new CountDownLatch(numberOfThreads);
final CountDownLatch doneLatch = new CountDownLatch(numberOfThreads);
for (int i = numberOfThreads; i > 0; i--) {
executorService.submit(new Callable<Void>() {
@Override
public Void call() throws Exception {
startLatch.countDown();
startLatch.await();
callable.call();
doneLatch.countDown();
return null;
}
});
}
doneLatch.await();
}
}
|
