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
|
package engine
import (
"math/rand"
"sync"
"time"
)
type Callback func() bool
type subscriber struct {
id uint64
interval int
callback Callback
ticks int
}
type Engine struct {
mu sync.Mutex
subscribers map[uint64]*subscriber
nextID uint64
ticker *time.Ticker
running bool
stopCh chan struct{}
}
func New() *Engine {
return &Engine{
subscribers: make(map[uint64]*subscriber),
}
}
func (e *Engine) Subscribe(interval int, cb Callback) uint64 {
e.mu.Lock()
defer e.mu.Unlock()
e.nextID++
e.subscribers[e.nextID] = &subscriber{
id: e.nextID,
interval: interval,
callback: cb,
}
return e.nextID
}
func (e *Engine) Unsubscribe(id uint64) {
e.mu.Lock()
defer e.mu.Unlock()
delete(e.subscribers, id)
}
func (e *Engine) Start(tickLengthMs int) {
e.mu.Lock()
defer e.mu.Unlock()
if e.running {
return
}
e.running = true
if tickLengthMs < 50 {
tickLengthMs = 50
}
e.ticker = time.NewTicker(time.Duration(tickLengthMs) * time.Millisecond)
e.stopCh = make(chan struct{})
go func() {
for {
select {
case <-e.ticker.C:
e.processTick()
case <-e.stopCh:
return
}
}
}()
}
func (e *Engine) Stop() {
e.mu.Lock()
defer e.mu.Unlock()
if e.ticker != nil {
e.ticker.Stop()
}
e.running = false
if e.stopCh != nil {
close(e.stopCh)
}
}
func (e *Engine) processTick() {
e.mu.Lock()
snapshot := make(map[uint64]*subscriber, len(e.subscribers))
for id, sub := range e.subscribers {
snapshot[id] = sub
}
e.mu.Unlock()
for id, sub := range snapshot {
sub.ticks++
if sub.ticks >= sub.interval {
sub.ticks = 0
if !sub.callback() {
e.mu.Lock()
delete(e.subscribers, id)
e.mu.Unlock()
}
}
}
}
func ToTicks(base float64) int {
if base < 1 {
base = 1
}
floor := int(base)
if rand.Float64() < base-float64(floor) {
return floor + 1
}
return floor
}
func ValuesEqual(a, b any) bool {
ai, aok := NumericValue(a)
bi, bok := NumericValue(b)
if aok && bok {
return ai == bi
}
return a == b
}
func NumericValue(v any) (float64, bool) {
switch x := v.(type) {
case int:
return float64(x), true
case int64:
return float64(x), true
case float64:
return x, true
}
return 0, false
}
|
