chore: add example

Signed-off-by: Bo-Yi Wu <[email protected]>

Author: appleboy

_example/go.mod

@@ -0,0 +1,8 @@
+module example
+
+go 1.16
+
+require (
+	github.com/golang-queue/queue v0.0.7
+	github.com/golang-queue/redisdb v0.0.1
+)

_example/go.sum

@@ -0,0 +1,109 @@
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_example/main.go

@@ -0,0 +1,78 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/golang-queue/queue"
+	"github.com/golang-queue/redisdb"
+)
+
+type job struct {
+	Message string
+}
+
+func (j *job) Bytes() []byte {
+	b, err := json.Marshal(j)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
+
+func main() {
+	taskN := 100
+	rets := make(chan string, taskN)
+
+	// define the worker
+	w := redisdb.NewWorker(
+		redisdb.WithAddr("127.0.0.1:6379"),
+		redisdb.WithChannel("foobar"),
+		redisdb.WithRunFunc(func(ctx context.Context, m queue.QueuedMessage) error {
+			v, ok := m.(*job)
+			if !ok {
+				if err := json.Unmarshal(m.Bytes(), &v); err != nil {
+					return err
+				}
+			}
+
+			rets <- v.Message
+			return nil
+		}),
+	)
+
+	// define the queue
+	q, err := queue.NewQueue(
+		queue.WithWorkerCount(10),
+		queue.WithWorker(w),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// start the five worker
+	q.Start()
+
+	// assign tasks in queue
+	for i := 0; i < taskN; i++ {
+		go func(i int) {
+			q.Queue(&job{
+				Message: fmt.Sprintf("handle the job: %d", i+1),
+			})
+		}(i)
+	}
+
+	// wait until all tasks done
+	for i := 0; i < taskN; i++ {
+		fmt.Println("message:", <-rets)
+		time.Sleep(50 * time.Millisecond)
+	}
+
+	// shutdown the service and notify all the worker
+	q.Shutdown()
+	// wait all jobs are complete.
+	q.Wait()
+}