stopwatch

stopwatch/stopwatch.go

@@ -0,0 +1,76 @@
+package stopwatch
+
+import (
+	"time"
+)
+
+type watch struct {
+	startTime time.Time
+	elapsed   time.Duration
+	isRunning bool
+}
+
+func StartNew() *watch {
+	w := &watch{}
+	w.Start()
+
+	return w
+}
+
+func (w *watch) Start() {
+	if !w.isRunning {
+		w.startTime = time.Now()
+		w.isRunning = true
+	}
+}
+
+// 将运行时间重置为零，并开始测量运行时间。
+func (w *watch) Restart() {
+	w.elapsed = 0
+	w.startTime = time.Now()
+	w.isRunning = true
+}
+
+// 停止时间间隔测量并将经过的时间重置为零。
+func (w *watch) Reset() {
+	w.elapsed = 0
+	w.startTime = time.Now()
+	w.isRunning = false
+}
+
+func (w *watch) Stop() {
+	if w.isRunning {
+		num := time.Since(w.startTime)
+		w.elapsed += num
+		w.isRunning = false
+
+		if w.elapsed < 0 {
+			w.elapsed = 0
+		}
+	}
+}
+
+func (w *watch) IsRunning() bool {
+	return w.isRunning
+}
+
+func (w *watch) Elapsed() time.Duration {
+	return time.Duration(w.ElapsedNanoseconds())
+}
+
+func (w *watch) ElapsedMilliseconds() int64 {
+	return w.ElapsedNanoseconds() / 1e6
+}
+
+func (w *watch) ElapsedMicroseconds() int64 {
+	return w.ElapsedNanoseconds() / 1e3
+}
+
+func (w *watch) ElapsedNanoseconds() int64 {
+	num := w.elapsed
+	if w.isRunning {
+		num += time.Since(w.startTime)
+	}
+
+	return num.Nanoseconds()
+}