diff --git a/.travis.yml b/.travis.yml
index b66a8c6..d897dd8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
 language: go
+  - 1.2
 before_install:
   - sudo apt-get install -qq gearman-job-server
diff --git a/README.md b/README.md
index c9a341a..4095447 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,12 @@ Usage
     w.AddServer("127.0.0.1:4730")
     w.AddFunc("ToUpper", ToUpper, worker.Immediately)
     w.AddFunc("ToUpperTimeOut5", ToUpper, 5)
-    w.Work()
+	if err := w.Ready(); err != nil {
+		log.Fatal(err)
+		return
+	}
+	go w.Work()
+	
 
 ## Client
 
diff --git a/client/client.go b/client/client.go
index c426226..99d760b 100644
--- a/client/client.go
+++ b/client/client.go
@@ -9,7 +9,7 @@ import (
 	"io"
 	"net"
 	"sync"
-	"fmt"
+//	"fmt"
 )
 
 /*
@@ -21,13 +21,14 @@ handle := c.Do("foobar", []byte("data here"), JOB_LOW | JOB_BG)
 
 */
 type Client struct {
+	sync.Mutex
+
 	net, addr, lastcall string
 	respHandler         map[string]ResponseHandler
 	innerHandler        map[string]ResponseHandler
 	in                  chan []byte
 	isConn              bool
 	conn                net.Conn
-	mutex               sync.RWMutex
 
 	ErrorHandler ErrorHandler
 }
@@ -115,7 +116,6 @@ func (client *Client) readLoop() {
 			client.err(err)
 			continue
 		}
-		fmt.Printf("[%X]", data)
 		client.in <- data
 	}
 	close(client.in)
@@ -141,23 +141,25 @@ func (client *Client) processLoop() {
 			continue
 		}
 		leftdata = nil
-		switch resp.DataType {
-		case ERROR:
-			if client.lastcall != "" {
-				client.handleInner(client.lastcall, resp)
-				client.lastcall = ""
-			} else {
-				client.err(GetError(resp.Data))
+		for resp != nil {
+			switch resp.DataType {
+			case ERROR:
+				if client.lastcall != "" {
+					resp = client.handleInner(client.lastcall, resp)
+					client.lastcall = ""
+				} else {
+					client.err(GetError(resp.Data))
+				}
+			case STATUS_RES:
+				resp = client.handleInner("s"+resp.Handle, resp)
+			case JOB_CREATED:
+				resp = client.handleInner("c", resp)
+			case ECHO_RES:
+				resp = client.handleInner("e", resp)
+			case WORK_DATA, WORK_WARNING, WORK_STATUS, WORK_COMPLETE,
+				WORK_FAIL, WORK_EXCEPTION:
+				resp = client.handleResponse(resp.Handle, resp)
 			}
-		case STATUS_RES:
-			client.handleInner("s"+resp.Handle, resp)
-		case JOB_CREATED:
-			client.handleInner("c", resp)
-		case ECHO_RES:
-			client.handleInner("e", resp)
-		case WORK_DATA, WORK_WARNING, WORK_STATUS, WORK_COMPLETE,
-			WORK_FAIL, WORK_EXCEPTION:
-			client.handleResponse(resp.Handle, resp)
 		}
 		if len(data) > l {
 			leftdata = data[l:]
@@ -173,44 +175,44 @@ func (client *Client) err(e error) {
 }
 
 // job handler
-func (client *Client) handleResponse(key string, resp *Response) {
-	client.mutex.RLock()
-	defer client.mutex.RUnlock()
+func (client *Client) handleResponse(key string, resp *Response) *Response {
 	if h, ok := client.respHandler[key]; ok {
 		h(resp)
 		delete(client.respHandler, key)
+		return nil
 	}
+	return resp
 }
 
 // job handler
-func (client *Client) handleInner(key string, resp *Response) {
+func (client *Client) handleInner(key string, resp *Response) * Response {
 	if h, ok := client.innerHandler[key]; ok {
 		h(resp)
 		delete(client.innerHandler, key)
+		return nil
 	}
+	return resp
 }
 
 // Internal do
 func (client *Client) do(funcname string, data []byte,
 	flag uint32) (handle string, err error) {
-	var wg sync.WaitGroup
-	wg.Add(1)
-	client.mutex.RLock()
+	var mutex sync.Mutex
+	mutex.Lock()
 	client.lastcall = "c"
-	client.innerHandler["c"] = ResponseHandler(func(resp *Response) {
-		defer wg.Done()
-		defer client.mutex.RUnlock()
+	client.innerHandler["c"] = func(resp *Response) {
 		if resp.DataType == ERROR {
 			err = GetError(resp.Data)
 			return
 		}
 		handle = resp.Handle
-	})
+		mutex.Unlock()
+	}
 	id := IdGen.Id()
 	req := getJob(id, []byte(funcname), data)
 	req.DataType = flag
 	client.write(req)
-	wg.Wait()
+	mutex.Lock()
 	return
 }
 
@@ -232,8 +234,6 @@ func (client *Client) Do(funcname string, data []byte,
 		datatype = SUBMIT_JOB
 	}
 	handle, err = client.do(funcname, data, datatype)
-	client.mutex.Lock()
-	defer client.mutex.Unlock()
 	if h != nil {
 		client.respHandler[handle] = h
 	}
@@ -262,41 +262,39 @@ func (client *Client) DoBg(funcname string, data []byte,
 // Get job status from job server.
 // !!!Not fully tested.!!!
 func (client *Client) Status(handle string) (status *Status, err error) {
-	var wg sync.WaitGroup
-	wg.Add(1)
-	client.mutex.Lock()
+	var mutex sync.Mutex
+	mutex.Lock()
 	client.lastcall = "s" + handle
-	client.innerHandler["s"+handle] = ResponseHandler(func(resp *Response) {
-		defer wg.Done()
-		defer client.mutex.Unlock()
+	client.innerHandler["s"+handle] = func(resp *Response) {
 		var err error
 		status, err = resp.Status()
 		if err != nil {
 			client.err(err)
 		}
-	})
+		mutex.Unlock()
+	}
 	req := getRequest()
 	req.DataType = GET_STATUS
 	req.Data = []byte(handle)
 	client.write(req)
-	wg.Wait()
+	mutex.Lock()
 	return
 }
 
 // Send a something out, get the samething back.
 func (client *Client) Echo(data []byte) (echo []byte, err error) {
-	var wg sync.WaitGroup
-	wg.Add(1)
-	client.innerHandler["e"] = ResponseHandler(func(resp *Response) {
-		defer wg.Done()
+	var mutex sync.Mutex
+	mutex.Lock()
+	client.innerHandler["e"] = func(resp *Response) {
 		echo = resp.Data
-	})
+		mutex.Unlock()
+	}
 	req := getRequest()
 	req.DataType = ECHO_REQ
 	req.Data = data
-	client.write(req)
 	client.lastcall = "e"
-	wg.Wait()
+	client.write(req)
+	mutex.Lock()
 	return
 }
 
diff --git a/client/request.go b/client/request.go
index 485eecc..f906692 100644
--- a/client/request.go
+++ b/client/request.go
@@ -9,7 +9,7 @@ import (
 	"encoding/binary"
 )
 
-// request
+// Request from client
 type request struct {
 	DataType uint32
 	Data     []byte
diff --git a/example/client/client b/example/client/client
new file mode 100755
index 0000000..c01975f
Binary files /dev/null and b/example/client/client differ
diff --git a/example/client/client.go b/example/client/client.go
index 9161c57..65cb58e 100644
--- a/example/client/client.go
+++ b/example/client/client.go
@@ -1,35 +1,35 @@
 package main
 
 import (
+	"github.com/mikespook/gearman-go/client"
     "log"
     "sync"
-    "github.com/mikespook/gearman-go/client"
 )
 
 func main() {
     var wg sync.WaitGroup
     // Set the autoinc id generator
-    // You can write your own id generator 
+	// You can write your own id generator
     // by implementing IdGenerator interface.
     // client.IdGen = client.NewAutoIncId()
 
-    c, err := client.New("tcp4", "127.0.0.1:4730")
+	c, err := client.New("tcp4", "127.0.0.1:4730")
     if err != nil {
         log.Fatalln(err)
     }
     defer c.Close()
-    c.ErrorHandler = func(e error) {
+	c.ErrorHandler = func(e error) {
         log.Println(e)
     }
     echo := []byte("Hello\x00 world")
     wg.Add(1)
-    echomsg, err := c.Echo(echo)
+	echomsg, err := c.Echo(echo)
     if err != nil {
         log.Fatalln(err)
     }
     log.Println(string(echomsg))
     wg.Done()
-    jobHandler := func(job *client.Response) {
+    jobHandler := func(job *client.Job) {
         log.Printf("%s", job.Data)
         wg.Done()
     }
@@ -38,7 +38,7 @@ func main() {
 		log.Fatalln(err)
 	}
     wg.Add(1)
-    status, err := c.Status(handle)
+	status, err := c.Status(handle)
     if err != nil {
         log.Fatalln(err)
     }
diff --git a/example/exec-worker/README.md b/example/exec-worker/README.md
deleted file mode 100644
index bfb7d55..0000000
--- a/example/exec-worker/README.md
+++ /dev/null
@@ -1,7 +0,0 @@
-= Exec Worker
-
-This program execute shell or php scripts as backend jobs.
-
-Scripts can communicat with the worker through STDERR using formated output.
-
-USE THIS AT YOUR OWN RASK!!!
diff --git a/example/exec-worker/client/client.php b/example/exec-worker/client/client.php
deleted file mode 100644
index 38515f5..0000000
--- a/example/exec-worker/client/client.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php
-
-# create our client object
-$gmclient= new GearmanClient();
-
-# add the default server (localhost)
-$gmclient->addServer();
-$data = array(
-    'Name' => 'foobar',
-    'Args'  => array("0", "1", "2", "3"),
-);
-
-$c = isset($_SERVER['argv'][1]) ? $_SERVER['argv'][1] : 10; 
-
-for ($i = 0; $i < $c; $i ++) {
-
-    # run reverse client in the background
-    $job_handle = $gmclient->doBackground("execphp", json_encode($data));
-
-    if ($gmclient->returnCode() != GEARMAN_SUCCESS) {
-        echo "bad return code\n";
-        exit;
-    }
-}
-/*
-$data = array(
-    'Name' => 'notexists',
-    'Args'  => array("0", "1", "2", "3"),
-);
-
-# run reverse client in the background
-$job_handle = $gmclient->doBackground("exec", json_encode($data));
-
-if ($gmclient->returnCode() != GEARMAN_SUCCESS)
-{
-  echo "bad return code\n";
-  exit;
-}
- */
-echo "done!\n";
diff --git a/example/exec-worker/exec.go b/example/exec-worker/exec.go
deleted file mode 100644
index 760f97b..0000000
--- a/example/exec-worker/exec.go
+++ /dev/null
@@ -1,123 +0,0 @@
-// Copyright 2012 Xing Xing <mikespook@gmail.com>.
-// All rights reserved.
-// Use of this source code is governed by a commercial
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-    "io"
-    "bytes"
-    "os/exec"
-    "encoding/json"
-    "github.com/mikespook/golib/log"
-    "github.com/mikespook/gearman-go/worker"
-)
-
-type outData struct {
-    Numerator, Denominator int
-    Warning bool
-    Data []byte
-    Debug string
-}
-
-type ShExec struct {
-    Name, basedir string
-    Args []string
-    *exec.Cmd
-    job *worker.Job
-    Logger *log.Logger
-}
-
-func NewShExec(basedir string, job *worker.Job) (sh *ShExec, err error) {
-    sh = &ShExec{
-        basedir: basedir,
-        job: job,
-        Args: make([]string, 0),
-    }
-    if err = sh.parse(job.Data); err != nil {
-        return nil, err
-    }
-    return
-}
-
-func (sh *ShExec) parse(data []byte) (err error) {
-    if err = json.Unmarshal(data, sh); err != nil {
-        return
-    }
-    return
-}
-
-func (sh *ShExec) Append(args ... string) {
-    sh.Args = append(sh.Args, args ...)
-}
-
-func (sh *ShExec) Prepend(args ... string) {
-    sh.Args = append(args, sh.Args ...)
-}
-
-func (sh *ShExec) Exec() (rslt []byte, err error){
-    sh.Logger.Debugf("Executing: Handle=%s, Exec=%s, Args=%v",
-        sh.job.Handle, sh.Name, sh.Args)
-    sh.Cmd = exec.Command(sh.Name, sh.Args ... )
-    go func() {
-        if ok := <-sh.job.Canceled(); ok {
-            sh.Cmd.Process.Kill()
-        }
-    }()
-    sh.Cmd.Dir = sh.basedir
-    var buf bytes.Buffer
-    sh.Cmd.Stdout = &buf
-    var errPipe io.ReadCloser
-    if errPipe, err = sh.Cmd.StderrPipe(); err != nil {
-        return nil, err
-    }
-    defer errPipe.Close()
-    go sh.processErr(errPipe)
-    if err = sh.Cmd.Run(); err != nil {
-        return nil, err
-    }
-    rslt = buf.Bytes()
-    return
-}
-
-func (sh *ShExec) processErr(pipe io.ReadCloser) {
-    result := make([]byte, 1024)
-    var more []byte
-    for {
-        n, err := pipe.Read(result)
-        if err != nil {
-            if err != io.EOF {
-                sh.job.UpdateData([]byte(err.Error()), true)
-            }
-            return
-        }
-        if more != nil {
-            result = append(more, result[:n]...)
-        } else {
-            result = result[:n]
-        }
-        if n < 1024 {
-            var out outData
-            if err := json.Unmarshal(result, &out); err != nil {
-                sh.job.UpdateData([]byte(result), true)
-                return
-            }
-            if out.Debug == "" {
-                if out.Data != nil {
-                    sh.job.UpdateData(out.Data, out.Warning)
-                }
-                if out.Numerator != 0 || out.Denominator != 0 {
-                    sh.job.UpdateStatus(out.Numerator, out.Denominator)
-                }
-            } else {
-                sh.Logger.Debugf("Debug: Handle=%s, Exec=%s, Args=%v, Data=%s",
-                sh.job.Handle, sh.Name, sh.Args, out.Debug)
-            }
-            more = nil
-        } else {
-            more = result
-        }
-    }
-}
-
diff --git a/example/exec-worker/func.go b/example/exec-worker/func.go
deleted file mode 100644
index 383861c..0000000
--- a/example/exec-worker/func.go
+++ /dev/null
@@ -1,38 +0,0 @@
-// Copyright 2012 Xing Xing <mikespook@gmail.com>.
-// All rights reserved.
-// Use of this source code is governed by a commercial
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-    "github.com/mikespook/golib/log"
-    "github.com/mikespook/gearman-go/worker"
-)
-
-func execShell(job *worker.Job) (result []byte, err error) {
-    log.Messagef("[Shell]Received: Handle=%s", job.Handle)
-    defer log.Messagef("[Shell]Finished: Handle=%s", job.Handle)
-    log.Debugf("[Shell]Received: Handle=%s, UID=%s, Data=%v", job.Handle, job.UniqueId, job.Data)
-    var sh *ShExec
-    if sh, err = NewShExec(*basedir, job); err != nil {
-        return
-    }
-    sh.Logger = log.DefaultLogger
-    return sh.Exec()
-}
-
-func execPHP(job *worker.Job) (result []byte, err error) {
-    log.Messagef("[PHP]Received: Handle=%s", job.Handle)
-    defer log.Messagef("[PHP]Finished: Handle=%s", job.Handle)
-    log.Debugf("[PHP]Received: Handle=%s, UID=%s, Data=%v", job.Handle, job.UniqueId, job.Data)
-    var sh *ShExec
-    if sh, err = NewShExec(*basedir, job); err != nil {
-        return
-    }
-    sh.Prepend("-f", sh.Name + ".php")
-    sh.Name = "php"
-    sh.Logger = log.DefaultLogger
-    return sh.Exec()
-}
-
diff --git a/example/exec-worker/lib/X.php b/example/exec-worker/lib/X.php
deleted file mode 100644
index 2079009..0000000
--- a/example/exec-worker/lib/X.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php
-
-class X {
-    private $stderr;
-    
-    function __construct() {
-        $this->stderr = fopen("php://stderr", "r");
-    }
-
-    public function sendMsg($msg, $warning = false, $numerator = 0, $denominator = 0) {
-        $result = array(
-            'Numerator'     =>  $numerator,
-            'Denominator'   =>  $denominator,
-            'Warning'       =>  $warning,
-            'Data'          =>  $msg,
-        );
-        fwrite($this->stderr, json_encode($result));
-    }
-
-    public function debug($msg) {
-         $result = array(
-            'Debug' => $msg,
-        );
-        fwrite($this->stderr, json_encode($result));       
-    }
-
-    public function close() {
-        fclose($this->stderr);
-    }
-
-    public function argv($index) {
-        $argv = $_SERVER['argv'];
-        return isset($argv[$index]) ? $argv[$index] : null;
-    }
-
-    public function argc() {
-        $argc = $_SERVER['argc'];
-        return $argc;
-    }
-}
diff --git a/example/exec-worker/lib/bootstrap.php b/example/exec-worker/lib/bootstrap.php
deleted file mode 100644
index 788673d..0000000
--- a/example/exec-worker/lib/bootstrap.php
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-function autoloader($class) {
-    $names = split("_", $class);
-    if (count($names) > 1) {
-        include implode(DIRECTORY_SEPARATOR, $names) . '.php';
-    } else {
-        include $class . '.php';
-    }
-}
-
-spl_autoload_register('autoloader');
diff --git a/example/exec-worker/log.go b/example/exec-worker/log.go
deleted file mode 100644
index bc1aaae..0000000
--- a/example/exec-worker/log.go
+++ /dev/null
@@ -1,47 +0,0 @@
-// Copyright 2012 Xing Xing <mikespook@gmail.com>.
-// All rights reserved.
-// Use of this source code is governed by a commercial
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-    "github.com/mikespook/golib/log"
-    "flag"
-    "strings"
-)
-
-var (
-    logfile  = flag.String("log", "",
-        "Log file to write errors and information to." +
-        " Empty string output to STDOUT.")
-    loglevel = flag.String("log-level", "all", "Log level to record." +
-        " Values 'error', 'warning', 'message', 'debug', 'all' and 'none'" +
-        " are accepted. Use '|' to combine more levels.")
-)
-
-func initLog() {
-    level := log.LogNone
-    levels := strings.SplitN(*loglevel, "|", -1)
-    for _, v := range levels {
-        switch v {
-        case "none":
-            level = level | log.LogNone
-            break
-        case "error":
-            level = level | log.LogError
-        case "warning":
-            level = level | log.LogWarning
-        case "message":
-            level = level | log.LogMessage
-        case "debug":
-            level = level | log.LogDebug
-        case "all":
-            level = log.LogAll
-        default:
-        }
-    }
-    if err := log.Init(*logfile, level); err != nil {
-        log.Error(err)
-    }
-}
diff --git a/example/exec-worker/script/default.php b/example/exec-worker/script/default.php
deleted file mode 100644
index c6bd04a..0000000
--- a/example/exec-worker/script/default.php
+++ /dev/null
@@ -1,8 +0,0 @@
-<?php
-define('ISCLI', PHP_SAPI === 'cli');
-if (!ISCLI) {
-    die("cli only!");
-}
-define("ROOT", dirname(__FILE__));
-define("LIB", ROOT . "/../lib/");
-include_once(LIB . "bootstrap.php");
diff --git a/example/exec-worker/script/foobar.php b/example/exec-worker/script/foobar.php
deleted file mode 100644
index 0fd35ee..0000000
--- a/example/exec-worker/script/foobar.php
+++ /dev/null
@@ -1,8 +0,0 @@
-<?php
-include("default.php");
-$x = new X();
-$x->sendMsg("test");
-$x->debug("debug message");
-sleep(10);
-$x->close();
-exit(0);
diff --git a/example/exec-worker/worker.go b/example/exec-worker/worker.go
deleted file mode 100644
index 271639a..0000000
--- a/example/exec-worker/worker.go
+++ /dev/null
@@ -1,106 +0,0 @@
-// Copyright 2012 Xing Xing <mikespook@gmail.com>.
-// All rights reserved.
-// Use of this source code is governed by a commercial
-// license that can be found in the LICENSE file.
-
-package main
-
-import (
-    "os"
-    "flag"
-    "time"
-    "github.com/mikespook/golib/log"
-    "github.com/mikespook/golib/pid"
-    "github.com/mikespook/golib/prof"
-    "github.com/mikespook/golib/signal"
-    "github.com/mikespook/gearman-go/worker"
-)
-
-var (
-    pidfile = flag.String("pid", "/run/seedworker.pid",
-        "PID file to write pid")
-    proffile = flag.String("prof", "", "Profiling file")
-    dumpfile = flag.String("dump", "", "Heap dumping file")
-    dumptime = flag.Int("dumptime", 5, "Heap dumping time interval")
-
-    joblimit = flag.Int("job-limit", worker.Unlimited,
-        "Maximum number of concurrently executing job." +
-        " Zero is unlimited.")
-
-    basedir = flag.String("basedir", "", "Working directory of the php scripts.")
-    timeout = flag.Uint("timeout", 30, "Executing time out.")
-    gearmand = flag.String("gearmand", "127.0.0.1:4730", "Address and port of gearmand")
-)
-
-func init() {
-
-    flag.Parse()
-    initLog()
-
-    if *basedir == "" {
-        *basedir = "./script/"
-    }
-}
-
-func main() {
-    log.Message("Starting ... ")
-    defer func() {
-        time.Sleep(time.Second)
-        log.Message("Shutdown complate!")
-    }()
-
-    // init profiling file
-    if *proffile != "" {
-        log.Debugf("Open a profiling file: %s", *proffile)
-        if err := prof.Start(*proffile); err != nil {
-            log.Error(err)
-        } else {
-            defer prof.Stop()
-        }
-    }
-
-    // init heap dumping file
-    if *dumpfile != "" {
-        log.Debugf("Open a heap dumping file: %s", *dumpfile)
-        if err := prof.NewDump(*dumpfile); err != nil {
-            log.Error(err)
-        } else {
-            defer prof.CloseDump()
-            go func() {
-                for prof.Dumping {
-                    time.Sleep(time.Duration(*dumptime) * time.Second)
-                    prof.Dump()
-                }
-            }()
-        }
-    }
-
-    // init pid file
-    log.Debugf("Open a pid file: %s", *pidfile)
-    if pidFile, err := pid.New(*pidfile); err != nil {
-        log.Error(err)
-    } else {
-        defer pidFile.Close()
-    }
-
-    w := worker.New(*joblimit)
-    if err := w.AddServer(*gearmand); err != nil {
-        log.Error(err)
-        return
-    }
-    if err := w.AddFunc("exec", execShell, uint32(*timeout)); err != nil {
-        log.Error(err)
-        return
-    }
-    if err := w.AddFunc("execphp", execPHP, uint32(*timeout)); err != nil {
-        log.Error(err)
-        return
-    }
-    defer w.Close()
-    go w.Work()
-
-    // signal handler
-    sh := signal.NewHandler()
-    sh.Bind(os.Interrupt, func() bool {return true})
-    sh.Loop()
-}
diff --git a/example/worker/worker b/example/worker/worker
new file mode 100755
index 0000000..c7ea095
Binary files /dev/null and b/example/worker/worker differ
diff --git a/example/worker/worker.go b/example/worker/worker.go
index bcb7154..d610776 100644
--- a/example/worker/worker.go
+++ b/example/worker/worker.go
@@ -1,61 +1,60 @@
 package main
 
 import (
-    "os"
-    "log"
-    "time"
-    "strings"
-    "github.com/mikespook/golib/signal"
-    "github.com/mikespook/gearman-go/worker"
+	"github.com/mikespook/gearman-go/worker"
+	"github.com/mikespook/golib/signal"
+	"log"
+	"os"
+	"strings"
+	"time"
 )
 
-func ToUpper(job *worker.Job) ([]byte, error) {
-    log.Printf("ToUpper: Handle=[%s]; UID=[%s], Data=[%s]\n",
-        job.Handle, job.UniqueId, job.Data)
-    data := []byte(strings.ToUpper(string(job.Data)))
-    return data, nil
+func ToUpper(job worker.Job) ([]byte, error) {
+	log.Printf("ToUpper: Data=[%s]\n", job.Data())
+	data := []byte(strings.ToUpper(string(job.Data())))
+	return data, nil
 }
 
-func ToUpperDelay10(job *worker.Job) ([]byte, error) {
-    log.Printf("ToUpperDelay10: Handle=[%s]; UID=[%s], Data=[%s]\n",
-        job.Handle, job.UniqueId, job.Data)
-    time.Sleep(10 * time.Second)
-    data := []byte(strings.ToUpper(string(job.Data)))
-    return data, nil
+func ToUpperDelay10(job worker.Job) ([]byte, error) {
+	log.Printf("ToUpper: Data=[%s]\n", job.Data())
+	time.Sleep(10 * time.Second)
+	data := []byte(strings.ToUpper(string(job.Data())))
+	return data, nil
 }
 
-
-
 func main() {
-    log.Println("Starting ...")
-    defer log.Println("Shutdown complete!")
-    w := worker.New(worker.Unlimited)
-    defer w.Close()
-    w.ErrHandler = func(e error) {
-        log.Println(e)
-        if e == worker.ErrConnection {
-            proc, err := os.FindProcess(os.Getpid())
-            if err != nil {
-                log.Println(err)
-            }
-            if err := proc.Signal(os.Interrupt); err != nil {
-                log.Println(err)
-            }
-        }
-    }
-    w.JobHandler = func(job *worker.Job) error {
-        log.Printf("H=%s, UID=%s, Data=%s, DataType=%d\n", job.Handle,
-            job.UniqueId, job.Data, job.DataType)
-        return nil
-    }
-    w.AddServer("127.0.0.1:4730")
-    w.AddFunc("ToUpper", ToUpper, worker.Immediately)
-    w.AddFunc("ToUpperTimeOut5", ToUpperDelay10, 5)
-    w.AddFunc("ToUpperTimeOut20", ToUpperDelay10, 20)
-    w.AddFunc("SysInfo", worker.SysInfo, worker.Immediately)
-    w.AddFunc("MemInfo", worker.MemInfo, worker.Immediately)
-    go w.Work()
-    sh := signal.NewHandler()
-    sh.Bind(os.Interrupt, func() bool {return true})
-    sh.Loop()
+	log.Println("Starting ...")
+	defer log.Println("Shutdown complete!")
+	w := worker.New(worker.Unlimited)
+	defer w.Close()
+	w.ErrorHandler = func(e error) {
+		log.Println(e)
+		if e == worker.ErrConnection {
+			proc, err := os.FindProcess(os.Getpid())
+			if err != nil {
+				log.Println(err)
+			}
+			if err := proc.Signal(os.Interrupt); err != nil {
+				log.Println(err)
+			}
+		}
+	}
+	w.JobHandler = func(job worker.Job) error {
+		log.Printf("Data=%s\n", job.Data())
+		return nil
+	}
+	w.AddServer("tcp4", "127.0.0.1:4730")
+	w.AddFunc("ToUpper", ToUpper, worker.Immediately)
+	w.AddFunc("ToUpperTimeOut5", ToUpperDelay10, 5)
+	w.AddFunc("ToUpperTimeOut20", ToUpperDelay10, 20)
+	w.AddFunc("SysInfo", worker.SysInfo, worker.Immediately)
+	w.AddFunc("MemInfo", worker.MemInfo, worker.Immediately)
+	if err := w.Ready(); err != nil {
+		log.Fatal(err)
+		return
+	}
+	go w.Work()
+	sh := signal.NewHandler()
+	sh.Bind(os.Interrupt, func() bool { return true })
+	sh.Loop()
 }
diff --git a/gearman_test.go b/gearman_test.go
index b8d41d4..fbb6dd6 100644
--- a/gearman_test.go
+++ b/gearman_test.go
@@ -54,6 +54,10 @@ func TestJobs(t *testing.T) {
 	w.ErrorHandler = func(e error) {
 		t.Error(e)
 	}
+	if err := w.Ready(); err != nil {
+		t.Error(err)
+		return
+	}
 	go w.Work()
 	t.Log("Worker is running...")
 
diff --git a/worker/agent.go b/worker/agent.go
index 7d4fa56..961f9e0 100644
--- a/worker/agent.go
+++ b/worker/agent.go
@@ -11,17 +11,16 @@ import (
 
 // The agent of job server.
 type agent struct {
-	conn   net.Conn
-	worker *Worker
-	in     chan []byte
-	net, addr   string
-	isConn bool
+	conn      net.Conn
+	worker    *Worker
+	in        chan []byte
+	net, addr string
 }
 
 // Create the agent of job server.
 func newAgent(net, addr string, worker *Worker) (a *agent, err error) {
 	a = &agent{
-		net: net,
+		net:    net,
 		addr:   addr,
 		worker: worker,
 		in:     make(chan []byte, QUEUE_SIZE),
@@ -34,44 +33,16 @@ func (a *agent) Connect() (err error) {
 	if err != nil {
 		return
 	}
-	a.isConn = true
+	go a.work()
 	return
 }
 
-func (a *agent) Work() {
-	go a.readLoop()
-
-	var resp *Response
+func (a *agent) work() {
+	var inpack *inPack
 	var l int
 	var err error
 	var data, leftdata []byte
-	for data = range a.in {
-		if len(leftdata) > 0 { // some data left for processing
-			data = append(leftdata, data...)
-		}
-		l = len(data)
-		if l < MIN_PACKET_LEN { // not enough data
-			leftdata = data
-			continue
-		}
-		if resp, l, err = decodeResponse(data); err != nil {
-			a.worker.err(err)
-			continue
-		}
-		leftdata = nil
-		resp.agentId = a.net + a.addr
-		a.worker.in <- resp
-		if len(data) > l {
-			leftdata = data[l:]
-		}
-	}
-}
-
-// read data from socket
-func (a *agent) readLoop() {
-	var data []byte
-	var err error
-	for a.isConn {
+	for {
 		if data, err = a.read(BUFFER_SIZE); err != nil {
 			if err == ErrConnClosed {
 				break
@@ -79,15 +50,42 @@ func (a *agent) readLoop() {
 			a.worker.err(err)
 			continue
 		}
-		a.in <- data
+		if len(leftdata) > 0 { // some data left for processing
+			data = append(leftdata, data...)
+		}
+		if len(data) < MIN_PACKET_LEN { // not enough data
+			leftdata = data
+			continue
+		}
+		if inpack, l, err = decodeInPack(data); err != nil {
+			a.worker.err(err)
+			continue
+		}
+		leftdata = nil
+		inpack.a = a
+		a.worker.in <- inpack
+		if len(data) > l {
+			leftdata = data[l:]
+		}
 	}
-	close(a.in)
 }
 
 func (a *agent) Close() {
 	a.conn.Close()
 }
 
+func (a *agent) Grab() {
+	outpack := getOutPack()
+	outpack.dataType = GRAB_JOB_UNIQ
+	a.write(outpack)
+}
+
+func (a *agent) PreSleep() {
+	outpack := getOutPack()
+	outpack.dataType = PRE_SLEEP
+	a.write(outpack)
+}
+
 // read length bytes from the socket
 func (a *agent) read(length int) (data []byte, err error) {
 	n := 0
@@ -95,13 +93,11 @@ func (a *agent) read(length int) (data []byte, err error) {
 	// read until data can be unpacked
 	for i := length; i > 0 || len(data) < MIN_PACKET_LEN; i -= n {
 		if n, err = a.conn.Read(buf); err != nil {
-			if !a.isConn {
-				err = ErrConnClosed
-				return
-			}
 			if err == io.EOF && n == 0 {
 				if data == nil {
 					err = ErrConnection
+				} else {
+					err = ErrConnClosed
 				}
 			}
 			return
@@ -115,9 +111,9 @@ func (a *agent) read(length int) (data []byte, err error) {
 }
 
 // Internal write the encoded job.
-func (a *agent) write(req *request) (err error) {
+func (a *agent) write(outpack *outPack) (err error) {
 	var n int
-	buf := req.Encode()
+	buf := outpack.Encode()
 	for i := 0; i < len(buf); i += n {
 		n, err = a.conn.Write(buf[i:])
 		if err != nil {
diff --git a/worker/common.go b/worker/common.go
index 8fbcf10..991bff4 100644
--- a/worker/common.go
+++ b/worker/common.go
@@ -41,6 +41,7 @@ const (
 	STATUS_RES      = 20
 	SET_CLIENT_ID   = 22
 	CAN_DO_TIMEOUT  = 23
+	ALL_YOURS       = 24
 	WORK_EXCEPTION  = 25
 	WORK_DATA       = 28
 	WORK_WARNING    = 29
diff --git a/worker/inpack.go b/worker/inpack.go
new file mode 100644
index 0000000..25d9da4
--- /dev/null
+++ b/worker/inpack.go
@@ -0,0 +1,108 @@
+// Copyright 2011 Xing Xing <mikespook@gmail.com>
+// All rights reserved.
+// Use of this source code is governed by a MIT
+// license that can be found in the LICENSE file.
+
+package worker
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"strconv"
+)
+
+// Worker side job
+type inPack struct {
+	dataType             uint32
+	data                 []byte
+	handle, uniqueId, fn string
+	a                    *agent
+}
+
+// Create a new job
+func getInPack() *inPack {
+	return &inPack{}
+}
+
+func (inpack *inPack) Data() []byte {
+	return inpack.data
+}
+
+// Send some datas to client.
+// Using this in a job's executing.
+func (inpack *inPack) SendData(data []byte) {
+	outpack := getOutPack()
+	outpack.dataType = WORK_DATA
+	hl := len(inpack.handle)
+	l := hl + len(data) + 1
+	outpack.data = getBuffer(l)
+	copy(outpack.data, []byte(inpack.handle))
+	copy(outpack.data[hl+1:], data)
+	inpack.a.write(outpack)
+}
+
+func (inpack *inPack) SendWarning(data []byte) {
+	outpack := getOutPack()
+	outpack.dataType = WORK_WARNING
+	hl := len(inpack.handle)
+	l := hl + len(data) + 1
+	outpack.data = getBuffer(l)
+	copy(outpack.data, []byte(inpack.handle))
+	copy(outpack.data[hl+1:], data)
+	inpack.a.write(outpack)
+}
+
+// Update status.
+// Tall client how many percent job has been executed.
+func (inpack *inPack) UpdateStatus(numerator, denominator int) {
+	n := []byte(strconv.Itoa(numerator))
+	d := []byte(strconv.Itoa(denominator))
+	outpack := getOutPack()
+	outpack.dataType = WORK_STATUS
+	hl := len(inpack.handle)
+	nl := len(n)
+	dl := len(d)
+	outpack.data = getBuffer(hl + nl + dl + 3)
+	copy(outpack.data, []byte(inpack.handle))
+	copy(outpack.data[hl+1:], n)
+	copy(outpack.data[hl+nl+2:], d)
+	inpack.a.write(outpack)
+}
+
+// Decode job from byte slice
+func decodeInPack(data []byte) (inpack *inPack, l int, err error) {
+	if len(data) < MIN_PACKET_LEN { // valid package should not less 12 bytes
+		err = fmt.Errorf("Invalid data: %V", data)
+		return
+	}
+	dl := int(binary.BigEndian.Uint32(data[8:12]))
+	dt := data[MIN_PACKET_LEN : dl+MIN_PACKET_LEN]
+	if len(dt) != int(dl) { // length not equal
+		err = fmt.Errorf("Invalid data: %V", data)
+		return
+	}
+	inpack = getInPack()
+	inpack.dataType = binary.BigEndian.Uint32(data[4:8])
+	switch inpack.dataType {
+	case JOB_ASSIGN:
+		s := bytes.SplitN(dt, []byte{'\x00'}, 3)
+		if len(s) == 3 {
+			inpack.handle = string(s[0])
+			inpack.fn = string(s[1])
+			inpack.data = s[2]
+		}
+	case JOB_ASSIGN_UNIQ:
+		s := bytes.SplitN(dt, []byte{'\x00'}, 4)
+		if len(s) == 4 {
+			inpack.handle = string(s[0])
+			inpack.fn = string(s[1])
+			inpack.uniqueId = string(s[2])
+			inpack.data = s[3]
+		}
+	default:
+		inpack.data = dt
+	}
+	l = dl + MIN_PACKET_LEN
+	return
+}
diff --git a/worker/inpack_test.go b/worker/inpack_test.go
new file mode 100644
index 0000000..75b9ba5
--- /dev/null
+++ b/worker/inpack_test.go
@@ -0,0 +1,62 @@
+package worker
+
+import (
+	"bytes"
+	"testing"
+)
+
+var (
+	inpackcases = map[uint32]map[string]string{
+		NOOP: map[string]string{
+			"src": "\x00RES\x00\x00\x00\x06\x00\x00\x00\x00",
+		},
+		NO_JOB: map[string]string{
+			"src": "\x00RES\x00\x00\x00\x0a\x00\x00\x00\x00",
+		},
+		JOB_ASSIGN: map[string]string{
+			"src":    "\x00RES\x00\x00\x00\x0b\x00\x00\x00\x07a\x00b\x00xyz",
+			"handle": "a",
+			"fn":     "b",
+			"data":   "xyz",
+		},
+		JOB_ASSIGN_UNIQ: map[string]string{
+			"src":    "\x00RES\x00\x00\x00\x1F\x00\x00\x00\x09a\x00b\x00c\x00xyz",
+			"handle": "a",
+			"fn":     "b",
+			"uid":    "c",
+			"data":   "xyz",
+		},
+	}
+)
+
+func TestInPack(t *testing.T) {
+	for k, v := range inpackcases {
+		inpack, _, err := decodeInPack([]byte(v["src"]))
+		if err != nil {
+			t.Error(err)
+		}
+		if inpack.dataType != k {
+			t.Errorf("DataType: %d expected, %d got.", k, inpack.dataType)
+		}
+		if handle, ok := v["handle"]; ok {
+			if inpack.handle != handle {
+				t.Errorf("Handle: %s expected, %s got.", handle, inpack.handle)
+			}
+		}
+		if fn, ok := v["fn"]; ok {
+			if inpack.fn != fn {
+				t.Errorf("FuncName: %s expected, %s got.", fn, inpack.fn)
+			}
+		}
+		if uid, ok := v["uid"]; ok {
+			if inpack.uniqueId != uid {
+				t.Errorf("UID: %s expected, %s got.", uid, inpack.uniqueId)
+			}
+		}
+		if data, ok := v["data"]; ok {
+			if bytes.Compare([]byte(data), inpack.data) != 0 {
+				t.Errorf("UID: %v expected, %v got.", data, inpack.data)
+			}
+		}
+	}
+}
diff --git a/worker/job.go b/worker/job.go
index af032df..4f9950a 100644
--- a/worker/job.go
+++ b/worker/job.go
@@ -1,68 +1,8 @@
 package worker
 
-import (
-	"strconv"
-)
-
 type Job interface {
 	Data() []byte
 	SendWarning(data []byte)
 	SendData(data []byte)
 	UpdateStatus(numerator, denominator int)
 }
-
-type _job struct {
-	a *agent
-	Handle string
-	data []byte
-}
-
-func getJob() *_job {
-	return &_job{}
-}
-
-func (j *_job) Data() []byte {
-	return j.data
-}
-
-// Send some datas to client.
-// Using this in a job's executing.
-func (j *_job) SendData(data []byte) {
-	req := getRequest()
-	req.DataType = WORK_DATA
-	hl := len(j.Handle)
-	l := hl + len(data) + 1
-	req.Data = getBuffer(l)
-	copy(req.Data, []byte(j.Handle))
-	copy(req.Data[hl + 1:], data)
-	j.a.write(req)
-}
-
-func (j *_job) SendWarning(data []byte) {
-	req := getRequest()
-	req.DataType = WORK_WARNING
-	hl := len(j.Handle)
-	l := hl + len(data) + 1
-	req.Data = getBuffer(l)
-	copy(req.Data, []byte(j.Handle))
-	copy(req.Data[hl + 1:], data)
-	j.a.write(req)
-}
-
-// Update status.
-// Tall client how many percent job has been executed.
-func (j *_job) UpdateStatus(numerator, denominator int) {
-	n := []byte(strconv.Itoa(numerator))
-	d := []byte(strconv.Itoa(denominator))
-	req := getRequest()
-	req.DataType = WORK_STATUS
-	hl := len(j.Handle)
-	nl := len(n)
-	dl := len(d)
-	req.Data = getBuffer(hl + nl + dl + 3)
-	copy(req.Data, []byte(j.Handle))
-	copy(req.Data[hl+1:], n)
-	copy(req.Data[hl+nl+2:], d)
-	j.a.write(req)
-}
-
diff --git a/worker/outpack.go b/worker/outpack.go
new file mode 100644
index 0000000..9464b8c
--- /dev/null
+++ b/worker/outpack.go
@@ -0,0 +1,53 @@
+// Copyright 2011 Xing Xing <mikespook@gmail.com>
+// All rights reserved.
+// Use of this source code is governed by a MIT
+// license that can be found in the LICENSE file.
+
+package worker
+
+import (
+	//	"fmt"
+	"encoding/binary"
+)
+
+// Worker side job
+type outPack struct {
+	dataType uint32
+	data     []byte
+	handle   string
+}
+
+func getOutPack() (outpack *outPack) {
+	// TODO pool
+	return &outPack{}
+}
+
+// Encode a job to byte slice
+func (outpack *outPack) Encode() (data []byte) {
+	var l int
+	if outpack.dataType == WORK_FAIL {
+		l = len(outpack.handle)
+	} else {
+		l = len(outpack.data)
+		if outpack.handle != "" {
+			l += len(outpack.handle) + 1
+		}
+	}
+	data = getBuffer(l + MIN_PACKET_LEN)
+	binary.BigEndian.PutUint32(data[:4], REQ)
+	binary.BigEndian.PutUint32(data[4:8], outpack.dataType)
+	binary.BigEndian.PutUint32(data[8:MIN_PACKET_LEN], uint32(l))
+	i := MIN_PACKET_LEN
+	if outpack.handle != "" {
+		hi := len(outpack.handle) + i
+		copy(data[i:hi], []byte(outpack.handle))
+		if outpack.dataType != WORK_FAIL {
+			data[hi] = '\x00'
+		}
+		i = hi + 1
+	}
+	if outpack.dataType != WORK_FAIL {
+		copy(data[i:], outpack.data)
+	}
+	return
+}
diff --git a/worker/outpack_test.go b/worker/outpack_test.go
new file mode 100644
index 0000000..dca1d8e
--- /dev/null
+++ b/worker/outpack_test.go
@@ -0,0 +1,83 @@
+package worker
+
+import (
+	"bytes"
+	"testing"
+)
+
+var (
+	outpackcases = map[uint32]map[string]string{
+		CAN_DO: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x01\x00\x00\x00\x01a",
+			"data": "a",
+		},
+		CAN_DO_TIMEOUT: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x17\x00\x00\x00\x06a\x00\x00\x00\x00\x01",
+			"data": "a\x00\x00\x00\x00\x01",
+		},
+		CANT_DO: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x02\x00\x00\x00\x01a",
+			"data": "a",
+		},
+		RESET_ABILITIES: map[string]string{
+			"src": "\x00REQ\x00\x00\x00\x03\x00\x00\x00\x00",
+		},
+		PRE_SLEEP: map[string]string{
+			"src": "\x00REQ\x00\x00\x00\x04\x00\x00\x00\x00",
+		},
+		GRAB_JOB: map[string]string{
+			"src": "\x00REQ\x00\x00\x00\x09\x00\x00\x00\x00",
+		},
+		GRAB_JOB_UNIQ: map[string]string{
+			"src": "\x00REQ\x00\x00\x00\x1E\x00\x00\x00\x00",
+		},
+		WORK_DATA: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x1C\x00\x00\x00\x03a\x00b",
+			"data": "a\x00b",
+		},
+		WORK_WARNING: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x1D\x00\x00\x00\x03a\x00b",
+			"data": "a\x00b",
+		},
+		WORK_STATUS: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x0C\x00\x00\x00\x08a\x0050\x00100",
+			"data": "a\x0050\x00100",
+		},
+		WORK_COMPLETE: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x0D\x00\x00\x00\x03a\x00b",
+			"data": "a\x00b",
+		},
+		WORK_FAIL: map[string]string{
+			"src":    "\x00REQ\x00\x00\x00\x0E\x00\x00\x00\x01a",
+			"handle": "a",
+		},
+		WORK_EXCEPTION: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x19\x00\x00\x00\x03a\x00b",
+			"data": "a\x00b",
+		},
+		SET_CLIENT_ID: map[string]string{
+			"src":  "\x00REQ\x00\x00\x00\x16\x00\x00\x00\x01a",
+			"data": "a",
+		},
+		ALL_YOURS: map[string]string{
+			"src": "\x00REQ\x00\x00\x00\x18\x00\x00\x00\x00",
+		},
+	}
+)
+
+func TestOutPack(t *testing.T) {
+	for k, v := range outpackcases {
+		outpack := getOutPack()
+		outpack.dataType = k
+		if handle, ok := v["handle"]; ok {
+			outpack.handle = handle
+		}
+		if data, ok := v["data"]; ok {
+			outpack.data = []byte(data)
+		}
+		data := outpack.Encode()
+		if bytes.Compare([]byte(v["src"]), data) != 0 {
+			t.Errorf("%d: %X expected, %X got.", k, v["src"], data)
+		}
+	}
+}
diff --git a/worker/request.go b/worker/request.go
deleted file mode 100644
index 5539ff9..0000000
--- a/worker/request.go
+++ /dev/null
@@ -1,50 +0,0 @@
-// Copyright 2011 Xing Xing <mikespook@gmail.com>
-// All rights reserved.
-// Use of this source code is governed by a MIT
-// license that can be found in the LICENSE file.
-
-package worker
-
-import (
-	"encoding/binary"
-)
-
-// Worker side job
-type request struct {
-	DataType             uint32
-	Data                 []byte
-	Handle, UniqueId, Fn string
-}
-
-func getRequest() (req *request) {
-	// TODO pool
-	return &request{}
-}
-
-// Encode a job to byte slice
-func (req *request) Encode() (data []byte) {
-	var l int
-	if req.DataType == WORK_FAIL {
-		l = len(req.Handle)
-	} else {
-		l = len(req.Data)
-		if req.Handle != "" {
-			l += len(req.Handle) + 1
-		}
-	}
-	data = getBuffer(l + MIN_PACKET_LEN)
-	binary.BigEndian.PutUint32(data[:4], REQ)
-	binary.BigEndian.PutUint32(data[4:8], req.DataType)
-	binary.BigEndian.PutUint32(data[8:MIN_PACKET_LEN], uint32(l))
-	i := MIN_PACKET_LEN
-	if req.Handle != "" {
-		hi := len(req.Handle) + i
-		copy(data[i:hi], []byte(req.Handle))
-		if req.DataType != WORK_FAIL {
-			data[hi] = '\x00'
-		}
-		i = i + hi
-	}
-	copy(data[i:], req.Data)
-	return
-}
diff --git a/worker/response.go b/worker/response.go
deleted file mode 100644
index d528474..0000000
--- a/worker/response.go
+++ /dev/null
@@ -1,62 +0,0 @@
-// Copyright 2011 Xing Xing <mikespook@gmail.com>
-// All rights reserved.
-// Use of this source code is governed by a MIT
-// license that can be found in the LICENSE file.
-
-package worker
-
-import (
-	"bytes"
-	"fmt"
-	"encoding/binary"
-)
-
-// Worker side job
-type Response struct {
-	DataType  uint32
-	Data                 []byte
-	Handle, UniqueId, Fn string
-	agentId	string
-}
-
-// Create a new job
-func getResponse() (resp *Response) {
-	return &Response{}
-}
-
-// Decode job from byte slice
-func decodeResponse(data []byte) (resp *Response, l int, err error) {
-	if len(data) < MIN_PACKET_LEN { // valid package should not less 12 bytes
-		err = fmt.Errorf("Invalid data: %V", data)
-		return
-	}
-	dl := int(binary.BigEndian.Uint32(data[8:12]))
-	dt := data[MIN_PACKET_LEN : dl+MIN_PACKET_LEN]
-	if len(dt) != int(dl) { // length not equal
-		err = fmt.Errorf("Invalid data: %V", data)
-		return
-	}
-	resp = getResponse()
-	resp.DataType = binary.BigEndian.Uint32(data[4:8])
-	switch resp.DataType {
-	case JOB_ASSIGN:
-		s := bytes.SplitN(dt, []byte{'\x00'}, 3)
-		if len(s) == 3 {
-			resp.Handle = string(s[0])
-			resp.Fn = string(s[1])
-			resp.Data = s[2]
-		}
-	case JOB_ASSIGN_UNIQ:
-		s := bytes.SplitN(dt, []byte{'\x00'}, 4)
-		if len(s) == 4 {
-			resp.Handle = string(s[0])
-			resp.Fn = string(s[1])
-			resp.UniqueId = string(s[2])
-			resp.Data = s[3]
-		}
-	default:
-		resp.Data = dt
-	}
-	l = dl + MIN_PACKET_LEN
-	return
-}
diff --git a/worker/worker.go b/worker/worker.go
index 82cc18b..ff5278d 100644
--- a/worker/worker.go
+++ b/worker/worker.go
@@ -5,16 +5,13 @@
 package worker
 
 import (
-	"fmt"
-	"time"
-	"sync"
 	"encoding/binary"
+	"fmt"
+	"sync"
+	"time"
 )
 
 const (
-	Unlimited = 0
-	OneByOne  = 1
-
 	Immediately = 0
 )
 
@@ -22,7 +19,7 @@ const (
 Worker side api for gearman
 
 usage:
-w = worker.New(worker.Unlimited)
+w = worker.New()
 w.AddFunction("foobar", foobar)
 w.AddServer("127.0.0.1:4730")
 w.Work() // Enter the worker's main loop
@@ -37,28 +34,24 @@ func foobar(job *Job) (data []byte, err os.Error) {
 }
 */
 type Worker struct {
-	agents  map[string]*agent
+	agents  []*agent
 	funcs   JobFuncs
-	in      chan *Response
+	in      chan *inPack
 	running bool
-	limit   chan bool
 
 	Id string
 	// assign a ErrFunc to handle errors
 	ErrorHandler ErrorHandler
-	JobHandler JobHandler
-	mutex sync.Mutex
+	JobHandler   JobHandler
+	mutex        sync.Mutex
 }
 
 // Get a new worker
-func New(l int) (worker *Worker) {
+func New() (worker *Worker) {
 	worker = &Worker{
-		agents: make(map[string]*agent, QUEUE_SIZE),
+		agents: make([]*agent, 0),
 		funcs:  make(JobFuncs),
-		in:     make(chan *Response, QUEUE_SIZE),
-	}
-	if l != Unlimited {
-		worker.limit = make(chan bool, l)
+		in:     make(chan *inPack, QUEUE_SIZE),
 	}
 	return
 }
@@ -78,16 +71,16 @@ func (worker *Worker) AddServer(net, addr string) (err error) {
 	if err != nil {
 		return err
 	}
-	worker.agents[net + addr] = a
+	worker.agents = append(worker.agents, a)
 	return
 }
 
 // Write a job to job server.
 // Here, the job's mean is not the oraginal mean.
 // Just looks like a network package for job's result or tell job server, there was a fail.
-func (worker *Worker) broadcast(req *request) {
+func (worker *Worker) broadcast(outpack *outPack) {
 	for _, v := range worker.agents {
-		v.write(req)
+		v.write(outpack)
 	}
 }
 
@@ -110,19 +103,19 @@ func (worker *Worker) AddFunc(funcname string,
 
 // inner add function
 func (worker *Worker) addFunc(funcname string, timeout uint32) {
-	req := getRequest()
+	outpack := getOutPack()
 	if timeout == 0 {
-		req.DataType = CAN_DO
-		req.Data = []byte(funcname)
+		outpack.dataType = CAN_DO
+		outpack.data = []byte(funcname)
 	} else {
-		req.DataType = CAN_DO_TIMEOUT
+		outpack.dataType = CAN_DO_TIMEOUT
 		l := len(funcname)
-		req.Data = getBuffer(l + 5)
-		copy(req.Data, []byte(funcname))
-		req.Data[l] = '\x00'
-		binary.BigEndian.PutUint32(req.Data[l + 1:], timeout)
+		outpack.data = getBuffer(l + 5)
+		copy(outpack.data, []byte(funcname))
+		outpack.data[l] = '\x00'
+		binary.BigEndian.PutUint32(outpack.data[l+1:], timeout)
 	}
-	worker.broadcast(req)
+	worker.broadcast(outpack)
 }
 
 // Remove a function.
@@ -141,63 +134,57 @@ func (worker *Worker) RemoveFunc(funcname string) (err error) {
 
 // inner remove function
 func (worker *Worker) removeFunc(funcname string) {
-	req := getRequest()
-	req.DataType = CANT_DO
-	req.Data = []byte(funcname)
-	worker.broadcast(req)
+	outpack := getOutPack()
+	outpack.dataType = CANT_DO
+	outpack.data = []byte(funcname)
+	worker.broadcast(outpack)
 }
 
-func (worker *Worker) dealResp(resp *Response) {
-	defer func() {
-		if worker.running && worker.limit != nil {
-			<-worker.limit
-		}
-	}()
-	switch resp.DataType {
+func (worker *Worker) handleInPack(inpack *inPack) {
+	switch inpack.dataType {
+	case NO_JOB:
+		inpack.a.PreSleep()
+	case NOOP:
+		inpack.a.Grab()
 	case ERROR:
-		worker.err(GetError(resp.Data))
+		worker.err(GetError(inpack.data))
 	case JOB_ASSIGN, JOB_ASSIGN_UNIQ:
-		if err := worker.exec(resp); err != nil {
+		if err := worker.exec(inpack); err != nil {
 			worker.err(err)
 		}
 	default:
-		worker.handleResponse(resp)
+		worker.customeHandler(inpack)
 	}
 }
 
+func (worker *Worker) Ready() (err error) {
+	for _, v := range worker.agents {
+		if err = v.Connect(); err != nil {
+			return
+		}
+	}
+	for funcname, f := range worker.funcs {
+		worker.addFunc(funcname, f.timeout)
+	}
+	return
+}
+
 // Main loop
 func (worker *Worker) Work() {
-	defer func() {
-		for _, v := range worker.agents {
-			v.Close()
-		}
-	}()
 	worker.running = true
 	for _, v := range worker.agents {
-		v.Connect()
-		go v.Work()
+		v.Grab()
 	}
-	worker.Reset()
-	for funcname, f := range worker.funcs {
-		worker.addFunc(funcname, f.timeout)
-	}
-	var resp *Response
-	for resp = range worker.in {
-		fmt.Println(resp)
-		go worker.dealResp(resp)
+	var inpack *inPack
+	for inpack = range worker.in {
+		go worker.handleInPack(inpack)
 	}
 }
 
 // job handler
-func (worker *Worker) handleResponse(resp *Response) {
+func (worker *Worker) customeHandler(inpack *inPack) {
 	if worker.JobHandler != nil {
-		job := getJob()
-		job.a = worker.agents[resp.agentId]
-		job.Handle = resp.Handle
-		if resp.DataType == ECHO_RES {
-			job.data = resp.Data
-		}
-		if err := worker.JobHandler(job); err != nil {
+		if err := worker.JobHandler(inpack); err != nil {
 			worker.err(err)
 		}
 	}
@@ -207,39 +194,36 @@ func (worker *Worker) handleResponse(resp *Response) {
 func (worker *Worker) Close() {
 	worker.running = false
 	close(worker.in)
-	if worker.limit != nil {
-		close(worker.limit)
-	}
 }
 
 // Send a something out, get the samething back.
 func (worker *Worker) Echo(data []byte) {
-	req := getRequest()
-	req.DataType = ECHO_REQ
-	req.Data = data
-	worker.broadcast(req)
+	outpack := getOutPack()
+	outpack.dataType = ECHO_REQ
+	outpack.data = data
+	worker.broadcast(outpack)
 }
 
 // Remove all of functions.
 // Both from the worker or job servers.
 func (worker *Worker) Reset() {
-	req := getRequest()
-	req.DataType = RESET_ABILITIES
-	worker.broadcast(req)
+	outpack := getOutPack()
+	outpack.dataType = RESET_ABILITIES
+	worker.broadcast(outpack)
 	worker.funcs = make(JobFuncs)
 }
 
 // Set the worker's unique id.
 func (worker *Worker) SetId(id string) {
 	worker.Id = id
-	req := getRequest()
-	req.DataType = SET_CLIENT_ID
-	req.Data = []byte(id)
-	worker.broadcast(req)
+	outpack := getOutPack()
+	outpack.dataType = SET_CLIENT_ID
+	outpack.data = []byte(id)
+	worker.broadcast(outpack)
 }
 
 // Execute the job. And send back the result.
-func (worker *Worker) exec(resp *Response) (err error) {
+func (worker *Worker) exec(inpack *inPack) (err error) {
 	defer func() {
 		if r := recover(); r != nil {
 			if e, ok := r.(error); ok {
@@ -249,34 +233,33 @@ func (worker *Worker) exec(resp *Response) (err error) {
 			}
 		}
 	}()
-	f, ok := worker.funcs[resp.Fn]
+	f, ok := worker.funcs[inpack.fn]
 	if !ok {
-		return fmt.Errorf("The function does not exist: %s", resp.Fn)
+		return fmt.Errorf("The function does not exist: %s", inpack.fn)
 	}
 	var r *result
-	job := getJob()
-	job.a = worker.agents[resp.agentId]
-	job.Handle = resp.Handle
 	if f.timeout == 0 {
-		d, e := f.f(job)
+		d, e := f.f(inpack)
 		r = &result{data: d, err: e}
 	} else {
-		r = execTimeout(f.f, job, time.Duration(f.timeout)*time.Second)
+		r = execTimeout(f.f, inpack, time.Duration(f.timeout)*time.Second)
 	}
-	req := getRequest()
-	if r.err == nil {
-		req.DataType = WORK_COMPLETE
-	} else {
-		if r.data == nil {
-			req.DataType = WORK_FAIL
-		} else {
-			req.DataType = WORK_EXCEPTION
-		}
-		err = r.err
-	}
-	req.Data = r.data
 	if worker.running {
-		job.a.write(req)
+		outpack := getOutPack()
+		if r.err == nil {
+			outpack.dataType = WORK_COMPLETE
+		} else {
+			if len(r.data) == 0 {
+				outpack.dataType = WORK_FAIL
+			} else {
+				outpack.dataType = WORK_EXCEPTION
+			}
+			err = r.err
+		}
+		outpack.handle = inpack.handle
+		outpack.data = r.data
+		inpack.a.write(outpack)
+		inpack.a.Grab()
 	}
 	return
 }
diff --git a/worker/worker_test.go b/worker/worker_test.go
index c875ff7..bb0666c 100644
--- a/worker/worker_test.go
+++ b/worker/worker_test.go
@@ -1,6 +1,9 @@
 package worker
 
-import "testing"
+import (
+	"sync"
+	"testing"
+)
 
 var worker *Worker
 
@@ -44,7 +47,20 @@ func TestWorkerRemoveFunc(t *testing.T) {
 }
 
 func TestWork(t *testing.T) {
+	var wg sync.WaitGroup
+	worker.JobHandler = func(job Job) error {
+		t.Logf("%s", job.Data())
+		wg.Done()
+		return nil
+	}
+	if err := worker.Ready(); err != nil {
+		t.Error(err)
+		return
+	}
 	go worker.Work()
+	wg.Add(1)
+	worker.Echo([]byte("Hello"))
+	wg.Wait()
 }
 
 func TestWorkerClose(t *testing.T) {