feat: 优化 timer 包的 GetTicker 获取到的为内置定时器池中的定时器，可通过 timer.NewTimer 创建定时器池另行使用

utils/timer/constants.go

@@ -15,3 +15,7 @@ const (
 const (
 	NoMark = "" // 没有设置标记的定时器
 )
+
+const (
+	DefaultTickerPoolSize = 96
+)

utils/timer/timer.go

@@ -1,35 +1,55 @@
 package timer
 
 import (
+	"fmt"
 	"sync"
 
 	"github.com/RussellLuo/timingwheel"
 )
 
-var tickerPoolSize = 96
-
-var timer = new(Timer)
+var (
+	tickerPoolSize = DefaultTickerPoolSize
+	standardTimer  = NewTimer(tickerPoolSize)
+)
 
 // SetTickerPoolSize 设置定时器池大小
-//   - 默认值为 96，当定时器池中的定时器不足时，会自动创建新的定时器，当定时器释放时，会将多余的定时器进行释放，否则将放入定时器池中
+//   - 默认值为 DefaultTickerPoolSize，当定时器池中的定时器不足时，会自动创建新的定时器，当定时器释放时，会将多余的定时器进行释放，否则将放入定时器池中
 func SetTickerPoolSize(size int) {
-	if size <= 0 {
-		panic("ticker pool size must be greater than 0")
-	}
-	timer.lock.Lock()
-	defer timer.lock.Unlock()
-	tickerPoolSize = size
+	_ = standardTimer.ChangeTickerPoolSize(size)
 }
 
 func GetTicker(size int, options ...Option) *Ticker {
-	return timer.NewTicker(size, options...)
+	return standardTimer.NewTicker(size, options...)
+}
+
+func NewTimer(tickerPoolSize int) *Timer {
+	if tickerPoolSize <= 0 {
+		panic(fmt.Errorf("timer tickerPoolSize must greater than 0, got: %d", tickerPoolSize))
+	}
+	return &Timer{
+		tickerPoolSize: tickerPoolSize,
+	}
 }
 
 type Timer struct {
-	tickers []*Ticker
-	lock    sync.Mutex
+	tickers        []*Ticker
+	lock           sync.Mutex
+	tickerPoolSize int
 }
 
+// ChangeTickerPoolSize 改变定时器池大小
+//   - 当传入的大小小于或等于 0 时，将会返回错误，并且不会发生任何改变
+func (slf *Timer) ChangeTickerPoolSize(size int) error {
+	if size <= 0 {
+		return fmt.Errorf("timer tickerPoolSize must greater than 0, got: %d", tickerPoolSize)
+	}
+	slf.lock.Lock()
+	defer slf.lock.Unlock()
+	slf.tickerPoolSize = size
+	return nil
+}
+
+// NewTicker 获取一个新的定时器
 func (slf *Timer) NewTicker(size int, options ...Option) *Ticker {
 	slf.lock.Lock()
 	defer slf.lock.Unlock()