move maybe-usable-by-other-cc-components to pkg. Fix all files to use the new paths (#88)

pkg/multiChanTicker/multiChanTicker.go

@@ -0,0 +1,64 @@
+package multiChanTicker
+
+import (
+	"time"
+
+	cclog "github.com/ClusterCockpit/cc-metric-collector/pkg/ccLogger"
+)
+
+type multiChanTicker struct {
+	ticker   *time.Ticker
+	channels []chan time.Time
+	done     chan bool
+}
+
+type MultiChanTicker interface {
+	Init(duration time.Duration)
+	AddChannel(chan time.Time)
+	Close()
+}
+
+func (t *multiChanTicker) Init(duration time.Duration) {
+	t.ticker = time.NewTicker(duration)
+	t.done = make(chan bool)
+	go func() {
+		done := func() {
+			close(t.done)
+			cclog.ComponentDebug("MultiChanTicker", "DONE")
+		}
+		for {
+			select {
+			case <-t.done:
+				done()
+				return
+			case ts := <-t.ticker.C:
+				cclog.ComponentDebug("MultiChanTicker", "Tick", ts)
+				for _, c := range t.channels {
+					select {
+					case <-t.done:
+						done()
+						return
+					case c <- ts:
+					}
+				}
+			}
+		}
+	}()
+}
+
+func (t *multiChanTicker) AddChannel(channel chan time.Time) {
+	t.channels = append(t.channels, channel)
+}
+
+func (t *multiChanTicker) Close() {
+	cclog.ComponentDebug("MultiChanTicker", "CLOSE")
+	t.done <- true
+	// wait for close of channel t.done
+	<-t.done
+}
+
+func NewTicker(duration time.Duration) MultiChanTicker {
+	t := &multiChanTicker{}
+	t.Init(duration)
+	return t
+}