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
|
/*
* Copyright 2016-2018 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
*/
package kotlinx.coroutines
import kotlinx.coroutines.channels.*
import kotlinx.coroutines.selects.*
import kotlin.test.*
class AtomicCancellationTest : TestBase() {
@Test
fun testSendAtomicCancel() = runBlocking {
expect(1)
val channel = Channel<Int>()
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
channel.send(42) // suspends
expect(4) // should execute despite cancellation
}
expect(3)
assertEquals(42, channel.receive()) // will schedule sender for further execution
job.cancel() // cancel the job next
yield() // now yield
finish(5)
}
@Test
fun testSelectSendAtomicCancel() = runBlocking {
expect(1)
val channel = Channel<Int>()
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
val result = select<String> { // suspends
channel.onSend(42) {
expect(4)
"OK"
}
}
assertEquals("OK", result)
expect(5) // should execute despite cancellation
}
expect(3)
assertEquals(42, channel.receive()) // will schedule sender for further execution
job.cancel() // cancel the job next
yield() // now yield
finish(6)
}
@Test
fun testReceiveAtomicCancel() = runBlocking {
expect(1)
val channel = Channel<Int>()
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
assertEquals(42, channel.receive()) // suspends
expect(4) // should execute despite cancellation
}
expect(3)
channel.send(42) // will schedule receiver for further execution
job.cancel() // cancel the job next
yield() // now yield
finish(5)
}
@Test
fun testSelectReceiveAtomicCancel() = runBlocking {
expect(1)
val channel = Channel<Int>()
val job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
val result = select<String> { // suspends
channel.onReceive {
assertEquals(42, it)
expect(4)
"OK"
}
}
assertEquals("OK", result)
expect(5) // should execute despite cancellation
}
expect(3)
channel.send(42) // will schedule receiver for further execution
job.cancel() // cancel the job next
yield() // now yield
finish(6)
}
@Test
fun testSelectDeferredAwaitCancellable() = runBlocking {
expect(1)
val deferred = async { // deferred, not yet complete
expect(4)
"OK"
}
assertEquals(false, deferred.isCompleted)
var job: Job? = null
launch { // will cancel job as soon as deferred completes
expect(5)
assertEquals(true, deferred.isCompleted)
job!!.cancel()
}
job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
try {
select<Unit> { // suspends
deferred.onAwait { expectUnreached() }
}
expectUnreached() // will not execute -- cancelled while dispatched
} finally {
finish(7) // but will execute finally blocks
}
}
expect(3) // continues to execute when job suspends
yield() // to deferred & canceller
expect(6)
}
@Test
fun testSelectJobJoinCancellable() = runBlocking {
expect(1)
val jobToJoin = launch { // not yet complete
expect(4)
}
assertEquals(false, jobToJoin.isCompleted)
var job: Job? = null
launch { // will cancel job as soon as jobToJoin completes
expect(5)
assertEquals(true, jobToJoin.isCompleted)
job!!.cancel()
}
job = launch(start = CoroutineStart.UNDISPATCHED) {
expect(2)
try {
select<Unit> { // suspends
jobToJoin.onJoin { expectUnreached() }
}
expectUnreached() // will not execute -- cancelled while dispatched
} finally {
finish(7) // but will execute finally blocks
}
}
expect(3) // continues to execute when job suspends
yield() // to jobToJoin & canceller
expect(6)
}
}
|
