diff --git a/client/client.go b/client/client.go
index 082efb4..e7e6444 100644
--- a/client/client.go
+++ b/client/client.go
@@ -3,10 +3,10 @@
 package client
 
 import (
+	"bufio"
 	"io"
 	"net"
 	"sync"
-	"bufio"
 )
 
 // One client connect to one server.
@@ -20,7 +20,7 @@ type Client struct {
 	in                  chan *Response
 	isConn              bool
 	conn                net.Conn
-	rw					*bufio.ReadWriter
+	rw                  *bufio.ReadWriter
 
 	ErrorHandler ErrorHandler
 }
diff --git a/client/common.go b/client/common.go
index 89ec4c4..d28caff 100644
--- a/client/common.go
+++ b/client/common.go
@@ -50,11 +50,11 @@ const (
 	dtSubmitJobLow    = 33
 	dtSubmitJobLowBg  = 34
 
-	WorkComplate =	dtWorkComplete
-	WorkDate = dtWorkData
-	WorkStatus = dtWorkStatus
-	WorkWarning = dtWorkWarning
-	WorkFail = dtWorkFail
+	WorkComplate  = dtWorkComplete
+	WorkDate      = dtWorkData
+	WorkStatus    = dtWorkStatus
+	WorkWarning   = dtWorkWarning
+	WorkFail      = dtWorkFail
 	WorkException = dtWorkException
 )
 
diff --git a/client/pool.go b/client/pool.go
index 1204908..d5db727 100644
--- a/client/pool.go
+++ b/client/pool.go
@@ -11,9 +11,9 @@ const (
 )
 
 var (
-	ErrNotFound = errors.New("Server Not Found")
+	ErrNotFound    = errors.New("Server Not Found")
 	SelectWithRate = selectWithRate
-	SelectRandom = selectRandom
+	SelectRandom   = selectRandom
 )
 
 type poolClient struct {
diff --git a/client/response.go b/client/response.go
index c215cb1..1fbc449 100644
--- a/client/response.go
+++ b/client/response.go
@@ -61,7 +61,7 @@ func decodeResponse(data []byte) (resp *Response, l int, err error) {
 		return
 	}
 	dl := int(binary.BigEndian.Uint32(data[8:12]))
-	if a < minPacketLength + dl {
+	if a < minPacketLength+dl {
 		err = fmt.Errorf("Invalid data: %V", data)
 		return
 	}
diff --git a/example/client/client.go b/example/client/client.go
index f84178e..67c9e0a 100644
--- a/example/client/client.go
+++ b/example/client/client.go
@@ -7,7 +7,6 @@ import (
 )
 
 func main() {
-	var wg sync.WaitGroup
 	// Set the autoinc id generator
 	// You can write your own id generator
 	// by implementing IdGenerator interface.
@@ -22,27 +21,58 @@ func main() {
 		log.Println(e)
 	}
 	echo := []byte("Hello\x00 world")
-	wg.Add(1)
 	echomsg, err := c.Echo(echo)
 	if err != nil {
 		log.Fatalln(err)
 	}
 	log.Println(string(echomsg))
-	wg.Done()
 	jobHandler := func(resp *client.Response) {
-		log.Printf("%s", resp.Data)
-		wg.Done()
+		switch resp.DataType {
+		case client.WorkException:
+			fallthrough
+		case client.WorkFail:
+			fallthrough
+		case client.WorkComplate:
+			if data, err := resp.Result(); err == nil {
+				log.Printf("RESULT: %V\n", data)
+			} else {
+				log.Printf("RESULT: %s\n", err)
+			}
+		case client.WorkWarning:
+			fallthrough
+		case client.WorkDate:
+			if data, err := resp.Update(); err == nil {
+				log.Printf("UPDATE: %V\n", data)
+			} else {
+				log.Printf("UPDATE: %V, %s\n", data, err)
+			}
+		case client.WorkStatus:
+			if data, err := resp.Status(); err == nil {
+				log.Printf("STATUS: %V\n", data)
+			} else {
+				log.Printf("STATUS: %s\n", err)
+			}
+		default:
+			log.Printf("UNKNOWN: %V", resp.Data)
+		}
 	}
 	handle, err := c.Do("ToUpper", echo, client.JobNormal, jobHandler)
 	if err != nil {
 		log.Fatalln(err)
 	}
-	wg.Add(1)
 	status, err := c.Status(handle)
 	if err != nil {
 		log.Fatalln(err)
 	}
 	log.Printf("%t", status)
 
-	wg.Wait()
+	_, err = c.Do("Foobar", echo, client.JobNormal, jobHandler)
+	if err != nil {
+		log.Fatalln(err)
+	}
+
+	log.Println("Press Ctrl-C to exit ...")
+	var mutex sync.Mutex
+	mutex.Lock()
+	mutex.Lock()
 }
diff --git a/example/worker/worker.go b/example/worker/worker.go
index 2fc6103..6b07e06 100644
--- a/example/worker/worker.go
+++ b/example/worker/worker.go
@@ -22,6 +22,16 @@ func ToUpperDelay10(job worker.Job) ([]byte, error) {
 	return data, nil
 }
 
+func Foobar(job worker.Job) ([]byte, error) {
+	log.Printf("Foobar: Data=[%s]\n", job.Data())
+	for i := 0; i < 10; i++ {
+		job.SendWarning([]byte{byte(i)})
+		job.SendData([]byte{byte(i)})
+		job.UpdateStatus(i+1, 100)
+	}
+	return job.Data(), nil
+}
+
 func main() {
 	log.Println("Starting ...")
 	defer log.Println("Shutdown complete!")
@@ -44,11 +54,12 @@ func main() {
 		return nil
 	}
 	w.AddServer("tcp4", "127.0.0.1:4730")
-	w.AddFunc("ToUpper", ToUpper, worker.Immediately)
+	w.AddFunc("Foobar", Foobar, worker.Unlimited)
+	w.AddFunc("ToUpper", ToUpper, worker.Unlimited)
 	w.AddFunc("ToUpperTimeOut5", ToUpperDelay10, 5)
 	w.AddFunc("ToUpperTimeOut20", ToUpperDelay10, 20)
-	w.AddFunc("SysInfo", worker.SysInfo, worker.Immediately)
-	w.AddFunc("MemInfo", worker.MemInfo, worker.Immediately)
+	w.AddFunc("SysInfo", worker.SysInfo, worker.Unlimited)
+	w.AddFunc("MemInfo", worker.MemInfo, worker.Unlimited)
 	if err := w.Ready(); err != nil {
 		log.Fatal(err)
 		return
diff --git a/worker/agent.go b/worker/agent.go
index 9c6cf26..3d5e941 100644
--- a/worker/agent.go
+++ b/worker/agent.go
@@ -1,18 +1,18 @@
 package worker
 
 import (
+	"bufio"
 	"io"
 	"net"
 	"strings"
 	"sync"
-	"bufio"
 )
 
 // The agent of job server.
 type agent struct {
 	sync.Mutex
 	conn      net.Conn
-	rw		*bufio.ReadWriter
+	rw        *bufio.ReadWriter
 	worker    *Worker
 	in        chan []byte
 	net, addr string
diff --git a/worker/inpack_test.go b/worker/inpack_test.go
index f852a04..7ce36fe 100644
--- a/worker/inpack_test.go
+++ b/worker/inpack_test.go
@@ -62,12 +62,12 @@ func TestInPack(t *testing.T) {
 }
 
 func BenchmarkDecode(b *testing.B) {
-    for i := 0; i < b.N; i++ {
+	for i := 0; i < b.N; i++ {
 		for _, v := range inpackcases {
 			_, _, err := decodeInPack([]byte(v["src"]))
 			if err != nil {
 				b.Error(err)
 			}
 		}
-    }
+	}
 }
diff --git a/worker/outpack_test.go b/worker/outpack_test.go
index 6ae9423..2dbb4b2 100644
--- a/worker/outpack_test.go
+++ b/worker/outpack_test.go
@@ -83,7 +83,7 @@ func TestOutPack(t *testing.T) {
 }
 
 func BenchmarkEncode(b *testing.B) {
-    for i := 0; i < b.N; i++ {
+	for i := 0; i < b.N; i++ {
 		for k, v := range outpackcases {
 			outpack := getOutPack()
 			outpack.dataType = k
@@ -95,5 +95,5 @@ func BenchmarkEncode(b *testing.B) {
 			}
 			outpack.Encode()
 		}
-    }
+	}
 }