diff --git a/xstream/reader.go b/xstream/reader.go
index 818fa1a..3d95129 100644
--- a/xstream/reader.go
+++ b/xstream/reader.go
@@ -12,6 +12,78 @@ import (
 	"qoobing.com/gomod/str"
 )
 
+//////////////////////////////////////////////////////////////////////////////////
+/////////////////////////  example  //////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////////
+//////  const (
+//////  	CORESERVER_NEWACCOUNT_GROUP = "groupid-coreserver-newaccount"
+//////  	CORESERVER_NEWACCOUNT_QUEUE = "coreserver.newaccount"
+//////  )
+//////
+//////  type NewAccountMessage struct {
+//////  	Sign       string    `json:"sign"`
+//////  	Appid      string    `json:"appid"`
+//////  	Userid     int64     `json:"userid"`
+//////  	Account    string    `json:"account"`
+//////  	CreateTime time.Time `json:"createtime"`
+//////  }
+//////
+//////  func runNewAccountMarketingEngine(ctx context.Context) {
+//////  	// r read message from redis
+//////  	cfg := config.Instance()
+//////  	r := NewReader(xstreamConf{
+//////  		group:          CORESERVER_NEWACCOUNT_GROUP,
+//////  		queue:          CORESERVER_NEWACCOUNT_QUEUE,
+//////  		sentinelConfig: cfg.CoreserverRedis,
+//////  	})
+//////  	defer r.Close()
+//////
+//////
+//////  	var error_wait_time = 0 * time.Millisecond
+//////  	for {
+//////  		// Step 0. wait a moment if need
+//////  		if error_wait_time > 0 {
+//////  			time.Sleep(error_wait_time)
+//////  		}
+//////
+//////  		// Step 1. fetch message
+//////  		var err error = nil
+//////  		var msg xstreamMessage
+//////  		var newacctMsg NewAccountMessage
+//////  		log.Infof("waiting fetch newaccount message from redis queue...")
+//////  		if msg, err = r.FetchMessage(ctx); err != nil {
+//////  			log.Errorf("failed fetch message from redis queue, err:%s", err)
+//////  			//error_wait_time = 1000 * time.Millisecond
+//////  			break
+//////  		}
+//////
+//////          // Step 2. decode message
+//////          if err := json.Unmarshal(msg.Value, &newacctMsg); err != nil {
+//////  			log.Errorf("failed json.unmarshal message[%s], err:%s", string(msg.Value), err)
+//////  			continue
+//////  		} else if newacctMsg.Userid == 0 || newacctMsg.Account == "" {
+//////  			log.Errorf("invalid newaccount message, userid=[%d]", newacctMsg.Userid)
+//////  			continue
+//////  		}
+//////  		log.Infof("fetch newaccount message success, account=[%s]", newacctMsg.Account)
+//////
+//////          // Step 3. handle message
+//////          // xxxxxxx handle message xxxxxxxxxxxxxxxxxxxxxxxx
+//////          // xxxxxxx handle message xxxxxxxxxxxxxxxxxxxxxxxx
+//////          // xxxxxxx handle message xxxxxxxxxxxxxxxxxxxxxxxx
+//////          // xxxxxxx handle message xxxxxxxxxxxxxxxxxxxxxxxx
+//////          // xxxxxxx handle message xxxxxxxxxxxxxxxxxxxxxxxx
+//////
+//////  		// Step 4. send ack to coreserver redis
+//////  		if err := r.CommitMessages(ctx, msg); err != nil {
+//////  			log.Errorf("failed commit message to redis, err:%s", err)
+//////  			error_wait_time = 1000 * time.Millisecond
+//////  			continue
+//////  		}
+//////  	}
+//////  }
+///////////////////////////// end example ////////////////////////////////////////////
+
 var (
 	redisPools = map[string]*redis.Pool{}
 )