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|
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 FractionalTicks(base, speed float64) int {
if speed <= 0 {
speed = 1
}
value := base / speed
if value < 1 {
value = 1
}
floor := int(value)
if rand.Float64() < value-float64(floor) {
return floor + 1
}
return floor
}
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