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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
|
// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"./a"
"context"
"fmt"
"runtime"
"sort"
"sync"
"time"
)
func TestReadAll() {
c := make(chan int)
go func() {
c <- 4
c <- 2
c <- 5
close(c)
}()
got := a.ReadAll(context.Background(), c)
want := []int{4, 2, 5}
if !a.SliceEqual(got, want) {
panic(fmt.Sprintf("ReadAll returned %v, want %v", got, want))
}
}
func TestMerge() {
c1 := make(chan int)
c2 := make(chan int)
go func() {
c1 <- 1
c1 <- 3
c1 <- 5
close(c1)
}()
go func() {
c2 <- 2
c2 <- 4
c2 <- 6
close(c2)
}()
ctx := context.Background()
got := a.ReadAll(ctx, a.Merge(ctx, c1, c2))
sort.Ints(got)
want := []int{1, 2, 3, 4, 5, 6}
if !a.SliceEqual(got, want) {
panic(fmt.Sprintf("Merge returned %v, want %v", got, want))
}
}
func TestFilter() {
c := make(chan int)
go func() {
c <- 1
c <- 2
c <- 3
close(c)
}()
even := func(i int) bool { return i%2 == 0 }
ctx := context.Background()
got := a.ReadAll(ctx, a.Filter(ctx, c, even))
want := []int{2}
if !a.SliceEqual(got, want) {
panic(fmt.Sprintf("Filter returned %v, want %v", got, want))
}
}
func TestSink() {
c := a.Sink[int](context.Background())
after := time.NewTimer(time.Minute)
defer after.Stop()
send := func(v int) {
select {
case c <- v:
case <-after.C:
panic("timed out sending to Sink")
}
}
send(1)
send(2)
send(3)
close(c)
}
func TestExclusive() {
val := 0
ex := a.MakeExclusive(&val)
var wg sync.WaitGroup
f := func() {
defer wg.Done()
for i := 0; i < 10; i++ {
p := ex.Acquire()
(*p)++
ex.Release(p)
}
}
wg.Add(2)
go f()
go f()
wg.Wait()
if val != 20 {
panic(fmt.Sprintf("after Acquire/Release loop got %d, want 20", val))
}
}
func TestExclusiveTry() {
s := ""
ex := a.MakeExclusive(&s)
p, ok := ex.TryAcquire()
if !ok {
panic("TryAcquire failed")
}
*p = "a"
var wg sync.WaitGroup
wg.Add(1)
go func() {
defer wg.Done()
_, ok := ex.TryAcquire()
if ok {
panic(fmt.Sprintf("TryAcquire succeeded unexpectedly"))
}
}()
wg.Wait()
ex.Release(p)
p, ok = ex.TryAcquire()
if !ok {
panic(fmt.Sprintf("TryAcquire failed"))
}
}
func TestRanger() {
s, r := a.Ranger[int]()
ctx := context.Background()
go func() {
// Receive one value then exit.
v, ok := r.Next(ctx)
if !ok {
panic(fmt.Sprintf("did not receive any values"))
} else if v != 1 {
panic(fmt.Sprintf("received %d, want 1", v))
}
}()
c1 := make(chan bool)
c2 := make(chan bool)
go func() {
defer close(c2)
if !s.Send(ctx, 1) {
panic(fmt.Sprintf("Send failed unexpectedly"))
}
close(c1)
if s.Send(ctx, 2) {
panic(fmt.Sprintf("Send succeeded unexpectedly"))
}
}()
<-c1
// Force a garbage collection to try to get the finalizers to run.
runtime.GC()
select {
case <-c2:
case <-time.After(time.Minute):
panic("Ranger Send should have failed, but timed out")
}
}
func main() {
TestReadAll()
TestMerge()
TestFilter()
TestSink()
TestExclusive()
TestExclusiveTry()
TestRanger()
}
|
