atomic_queue/queue_test.go at master · JustDaile/atomic_queue · GitHub

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
package atomic_queue_test

import (
	"fmt"
	"testing"

	"bitbucket.org/justdaile/atomic_queue"
	"github.com/stretchr/testify/assert"
)

func TestAtomicQueue_Basic(t *testing.T) {
	queue := atomic_queue.NewAtomicQueue[int]()
	assert.Equal(t, queue.Len(), 0)
	assert.Equal(t, queue.IsEmpty(), true)

	queue.Enqueue(1)
	assert.Equal(t, queue.Len(), 1)
	assert.Equal(t, queue.IsEmpty(), false)

	queue.Enqueue(2)
	assert.Equal(t, queue.Len(), 2)

	item, ok := queue.Peek()
	assert.Equal(t, ok, true)
	assert.Equal(t, item, 1)
	assert.Equal(t, queue.Len(), 2)

	item, ok = queue.Dequeue()
	assert.Equal(t, ok, true)
	assert.Equal(t, item, 1)
	assert.Equal(t, queue.Len(), 1)

	item, ok = queue.Dequeue()
	assert.Equal(t, ok, true)
	assert.Equal(t, item, 2)
	assert.Equal(t, queue.Len(), 0)
	assert.Equal(t, queue.IsEmpty(), true)

	item, ok = queue.Dequeue()
	assert.Equal(t, ok, false)
	assert.Equal(t, item, 0) // zero value for int
}

func TestAtomicQueue_Concurrent(t *testing.T) {
	queue := atomic_queue.NewAtomicQueue[int]()
	queued := make(chan bool)
	emptied := make(chan bool)

	// Dequeue in a separate goroutine
	go func() {
		defer func() {
			emptied <- true
		}()
		var done bool
		for {
			queue.Dequeue()

			select {
			case done = <-queued:
				// Enqueuing is complete
			default:
				// Enqueuing still in progress, continue dequeuing
			}

			if done && queue.IsEmpty() {
				break
			}
		}
	}()

	// Enqueue in a separate goroutine
	go func() {
		for i := range 1000 {
			queue.Enqueue(i)
		}
		queued <- true
	}()

	<-emptied

	close(queued)
	close(emptied)

	assert.Equal(t, 0, queue.Len())
	assert.Equal(t, true, queue.IsEmpty())
}

type TestStruct struct {
	ID   int
	Name string
}

func TestAtomicQueue_StructConcurrent(t *testing.T) {
	queue := atomic_queue.NewAtomicQueue[TestStruct]()
	queued := make(chan bool)
	emptied := make(chan bool)

	// Dequeue in a separate goroutine
	go func() {
		defer func() {
			emptied <- true
		}()
		var done bool
		for {
			queue.Dequeue()

			select {
			case done = <-queued:
				// Enqueuing is complete
			default:
				// Enqueuing still in progress, continue dequeuing
			}

			if done && queue.IsEmpty() {
				break
			}
		}
	}()

	// Enqueue in a separate goroutine
	go func() {
		for i := range 1000 {
			queue.Enqueue(TestStruct{ID: i, Name: fmt.Sprintf("Item %d", i)})
		}
		queued <- true
	}()

	<-emptied

	close(queued)
	close(emptied)

	assert.Equal(t, 0, queue.Len())
	assert.Equal(t, true, queue.IsEmpty())
}