adding quickfix library

quickfix/internal/event_timer.go

@@ -0,0 +1,70 @@
+package internal
+
+import (
+	"sync"
+	"time"
+)
+
+type EventTimer struct {
+	f     func()
+	timer *time.Timer
+	done  chan struct{}
+	wg    sync.WaitGroup
+	once  sync.Once
+}
+
+func NewEventTimer(task func()) *EventTimer {
+	t := &EventTimer{
+		f:     task,
+		timer: newStoppedTimer(),
+		done:  make(chan struct{}),
+	}
+
+	t.wg.Add(1)
+	go func() {
+		defer t.wg.Done()
+
+		for {
+			select {
+
+			case <-t.timer.C:
+				t.f()
+
+			case <-t.done:
+				t.timer.Stop()
+				return
+
+			}
+		}
+	}()
+
+	return t
+}
+
+func (t *EventTimer) Stop() {
+	if t == nil {
+		return
+	}
+
+	t.once.Do(func() {
+		close(t.done)
+	})
+
+	t.wg.Wait()
+}
+
+func (t *EventTimer) Reset(timeout time.Duration) {
+	if t == nil {
+		return
+	}
+
+	t.timer.Reset(timeout)
+}
+
+func newStoppedTimer() *time.Timer {
+	timer := time.NewTimer(time.Second)
+	if !timer.Stop() {
+		<-timer.C
+	}
+	return timer
+}