Add Examples + More Verbose Logging

Signed-off-by: Sherif Abdel-Naby <sherifabdlnaby@gmail.com>

examples/schedule-prom-metrics/main.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"github.com/sherifabdlnaby/sched"
+	"github.com/uber-go/tally"
+	"github.com/uber-go/tally/prometheus"
+	"log"
+	"math/rand"
+	"net/http"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+func main() {
+
+	promReporter := prometheus.NewReporter(prometheus.Options{})
+	promMterics, closer := tally.NewRootScope(tally.ScopeOptions{
+		Tags:           map[string]string{},
+		CachedReporter: promReporter,
+		Separator:      prometheus.DefaultSeparator,
+	}, 1*time.Second)
+	defer closer.Close()
+
+	fixedEvery5s, err := sched.NewFixed(5 * time.Second)
+	if err != nil {
+		panic(fmt.Sprintf("invalid interval: %s", err.Error()))
+	}
+
+	job := func() {
+		log.Println("Doing some work for random time...")
+		time.Sleep(time.Duration(int(rand.Int63n(50)+1)*100) * time.Millisecond)
+		log.Println("Finished Work.")
+	}
+
+	// Create Schedule
+	schedule := sched.NewSchedule("every5s", fixedEvery5s, job, sched.WithLogger(sched.DefaultLogger()),
+		sched.WithMetrics(promMterics))
+
+	// Start Schedule
+	schedule.Start()
+
+	// Star Prom Server
+	http.Handle("/metrics", promReporter.HTTPHandler())
+	go http.ListenAndServe(":8080", nil)
+	log.Println("Prometheus Metrics at :8080/metrics")
+
+	// Listen to CTRL + C And indefintly wait shutdown.
+	signalChan := make(chan os.Signal, 1)
+	signal.Notify(signalChan, syscall.SIGTERM, syscall.SIGINT, syscall.SIGQUIT)
+	_ = <-signalChan
+
+	// Stop before shutting down.
+	schedule.Stop()
+
+	return
+}