diff --git a/broker/broker.go b/broker.go
similarity index 57%
rename from broker/broker.go
rename to broker.go
index 0ba2b48..c5b325b 100644
--- a/broker/broker.go
+++ b/broker.go
@@ -1,14 +1,11 @@
-package broker
+package mq
 
 import (
 	"context"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"math/rand"
 	"net"
-	"slices"
-	"sync"
 	"time"
 
 	"github.com/oarkflow/xid"
@@ -26,9 +23,9 @@ type Broker struct {
 
 type Queue struct {
 	name     string
+	conn     map[net.Conn]struct{}
 	messages *xsync.MapOf[string, *Task]
 	deferred *xsync.MapOf[string, *Task]
-	conn     map[net.Conn]struct{}
 }
 
 type Task struct {
@@ -85,14 +82,18 @@ func (b *Broker) NewQueue(qName string) {
 	}
 }
 
-func (b *Broker) Send(ctx context.Context, cmd Command) {
+func (b *Broker) Send(ctx context.Context, cmd Command) error {
 	queue, ok := b.queues.Get(cmd.Queue)
 	if !ok || queue == nil {
-		return
+		return errors.New("invalid queue or not exists")
 	}
 	for client := range queue.conn {
-		utils.Write(ctx, client, cmd)
+		err := utils.Write(ctx, client, cmd)
+		if err != nil {
+			return err
+		}
 	}
+	return nil
 }
 
 func (b *Broker) Publish(ctx context.Context, message Task, queueName string) error {
@@ -106,7 +107,10 @@ func (b *Broker) Publish(ctx context.Context, message Task, queueName string) er
 		return nil
 	}
 	for client := range queue.conn {
-		utils.Write(ctx, client, message)
+		err = utils.Write(ctx, client, message)
+		if err != nil {
+			return err
+		}
 	}
 	return nil
 }
@@ -191,7 +195,10 @@ func (b *Broker) subscribe(ctx context.Context, queueName string, conn net.Conn)
 		q.deferred = xsync.NewMap[string, *Task]()
 	}
 	q.deferred.ForEach(func(_ string, message *Task) bool {
-		b.Publish(ctx, *message, queueName)
+		err := b.Publish(ctx, *message, queueName)
+		if err != nil {
+			return false
+		}
 		return true
 	})
 	q.deferred = nil
@@ -202,7 +209,9 @@ func (b *Broker) Start(ctx context.Context, addr string) error {
 	if err != nil {
 		return err
 	}
-	defer listener.Close()
+	defer func() {
+		_ = listener.Close()
+	}()
 	fmt.Println("Broker server started on", addr)
 	for {
 		conn, err := listener.Accept()
@@ -213,135 +222,3 @@ func (b *Broker) Start(ctx context.Context, addr string) error {
 		go utils.ReadFromConn(ctx, conn, b.readMessage)
 	}
 }
-
-type Consumer struct {
-	serverAddr string
-	handlers   map[string]Handler
-	queues     []string
-	conn       net.Conn
-}
-
-func NewConsumer(serverAddr string, queues ...string) *Consumer {
-	return &Consumer{
-		handlers:   make(map[string]Handler),
-		serverAddr: serverAddr,
-		queues:     queues,
-	}
-}
-
-func (c *Consumer) Close() error {
-	return c.conn.Close()
-}
-
-func (c *Consumer) subscribe(queue string) error {
-	ctx := context.Background()
-	subscribe := Command{Command: SUBSCRIBE, Queue: queue}
-	return utils.Write(ctx, c.conn, subscribe)
-}
-
-func (c *Consumer) ProcessTask(ctx context.Context, msg Task) Result {
-	handler, exists := c.handlers[msg.CurrentQueue]
-	if !exists {
-		return Result{Error: errors.New("No handler for queue " + msg.CurrentQueue)}
-	}
-	return handler(ctx, msg)
-}
-
-func (c *Consumer) handleCommandMessage(msg Command) error {
-	switch msg.Command {
-	case STOP:
-		return c.Close()
-	default:
-		return fmt.Errorf("unknown command in consumer %s", msg.Command)
-	}
-}
-
-func (c *Consumer) handleTaskMessage(ctx context.Context, msg Task) error {
-	response := c.ProcessTask(ctx, msg)
-	response.Queue = msg.CurrentQueue
-	if msg.ID == "" {
-		response.Error = errors.New("task ID is empty")
-		response.Command = "error"
-	} else {
-		response.Command = "completed"
-		response.MessageID = msg.ID
-	}
-	return utils.Write(ctx, c.conn, response)
-}
-
-func (c *Consumer) readMessage(ctx context.Context, message []byte) error {
-	var cmdMsg Command
-	var task Task
-	err := json.Unmarshal(message, &cmdMsg)
-	if err == nil && cmdMsg.Command != 0 {
-		return c.handleCommandMessage(cmdMsg)
-	}
-	err = json.Unmarshal(message, &task)
-	if err == nil {
-		return c.handleTaskMessage(ctx, task)
-	}
-	return nil
-}
-
-const (
-	maxRetries    = 5
-	initialDelay  = 2 * time.Second
-	maxBackoff    = 30 * time.Second // Upper limit for backoff delay
-	jitterPercent = 0.5              // 50% jitter
-)
-
-func (c *Consumer) AttemptConnect() error {
-	var conn net.Conn
-	var err error
-	delay := initialDelay
-	for i := 0; i < maxRetries; i++ {
-		conn, err = net.Dial("tcp", c.serverAddr)
-		if err == nil {
-			c.conn = conn
-			return nil
-		}
-		sleepDuration := calculateJitter(delay)
-		fmt.Printf("Failed connecting to %s (attempt %d/%d): %v, Retrying in %v...\n", c.serverAddr, i+1, maxRetries, err, sleepDuration)
-		time.Sleep(sleepDuration)
-		delay *= 2
-		if delay > maxBackoff {
-			delay = maxBackoff
-		}
-	}
-
-	return fmt.Errorf("could not connect to server %s after %d attempts: %w", c.serverAddr, maxRetries, err)
-}
-
-func calculateJitter(baseDelay time.Duration) time.Duration {
-	jitter := time.Duration(rand.Float64()*jitterPercent*float64(baseDelay)) - time.Duration(jitterPercent*float64(baseDelay)/2)
-	return baseDelay + jitter
-}
-
-func (c *Consumer) Consume(ctx context.Context, queues ...string) error {
-	err := c.AttemptConnect()
-	if err != nil {
-		return err
-	}
-	var wg sync.WaitGroup
-	wg.Add(1)
-	go func() {
-		defer wg.Done()
-		utils.ReadFromConn(ctx, c.conn, func(ctx context.Context, conn net.Conn, message []byte) error {
-			return c.readMessage(ctx, message)
-		})
-	}()
-	c.queues = slices.Compact(append(c.queues, queues...))
-	for _, q := range c.queues {
-		if err := c.subscribe(q); err != nil {
-			return fmt.Errorf("failed to connect to server for queue %s: %v", q, err)
-		}
-		fmt.Println("Consumer started on", q)
-	}
-	wg.Wait()
-	fmt.Println("Consumer stopped.")
-	return nil
-}
-
-func (c *Consumer) RegisterHandler(queue string, handler Handler) {
-	c.handlers[queue] = handler
-}
diff --git a/consumer.go b/consumer.go
new file mode 100644
index 0000000..51bf77b
--- /dev/null
+++ b/consumer.go
@@ -0,0 +1,144 @@
+package mq
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/oarkflow/mq/utils"
+	"math/rand"
+	"net"
+	"slices"
+	"sync"
+	"time"
+)
+
+type Consumer struct {
+	serverAddr string
+	handlers   map[string]Handler
+	queues     []string
+	conn       net.Conn
+}
+
+func NewConsumer(serverAddr string, queues ...string) *Consumer {
+	return &Consumer{
+		handlers:   make(map[string]Handler),
+		serverAddr: serverAddr,
+		queues:     queues,
+	}
+}
+
+func (c *Consumer) Close() error {
+	return c.conn.Close()
+}
+
+func (c *Consumer) subscribe(queue string) error {
+	ctx := context.Background()
+	subscribe := Command{Command: SUBSCRIBE, Queue: queue}
+	return utils.Write(ctx, c.conn, subscribe)
+}
+
+func (c *Consumer) ProcessTask(ctx context.Context, msg Task) Result {
+	handler, exists := c.handlers[msg.CurrentQueue]
+	if !exists {
+		return Result{Error: errors.New("No handler for queue " + msg.CurrentQueue)}
+	}
+	return handler(ctx, msg)
+}
+
+func (c *Consumer) handleCommandMessage(msg Command) error {
+	switch msg.Command {
+	case STOP:
+		return c.Close()
+	default:
+		return fmt.Errorf("unknown command in consumer %d", msg.Command)
+	}
+}
+
+func (c *Consumer) handleTaskMessage(ctx context.Context, msg Task) error {
+	response := c.ProcessTask(ctx, msg)
+	response.Queue = msg.CurrentQueue
+	if msg.ID == "" {
+		response.Error = errors.New("task ID is empty")
+		response.Command = "error"
+	} else {
+		response.Command = "completed"
+		response.MessageID = msg.ID
+	}
+	return utils.Write(ctx, c.conn, response)
+}
+
+func (c *Consumer) readMessage(ctx context.Context, message []byte) error {
+	var cmdMsg Command
+	var task Task
+	err := json.Unmarshal(message, &cmdMsg)
+	if err == nil && cmdMsg.Command != 0 {
+		return c.handleCommandMessage(cmdMsg)
+	}
+	err = json.Unmarshal(message, &task)
+	if err == nil {
+		return c.handleTaskMessage(ctx, task)
+	}
+	return nil
+}
+
+const (
+	maxRetries    = 5
+	initialDelay  = 2 * time.Second
+	maxBackoff    = 30 * time.Second // Upper limit for backoff delay
+	jitterPercent = 0.5              // 50% jitter
+)
+
+func (c *Consumer) AttemptConnect() error {
+	var conn net.Conn
+	var err error
+	delay := initialDelay
+	for i := 0; i < maxRetries; i++ {
+		conn, err = net.Dial("tcp", c.serverAddr)
+		if err == nil {
+			c.conn = conn
+			return nil
+		}
+		sleepDuration := calculateJitter(delay)
+		fmt.Printf("Failed connecting to %s (attempt %d/%d): %v, Retrying in %v...\n", c.serverAddr, i+1, maxRetries, err, sleepDuration)
+		time.Sleep(sleepDuration)
+		delay *= 2
+		if delay > maxBackoff {
+			delay = maxBackoff
+		}
+	}
+
+	return fmt.Errorf("could not connect to server %s after %d attempts: %w", c.serverAddr, maxRetries, err)
+}
+
+func calculateJitter(baseDelay time.Duration) time.Duration {
+	jitter := time.Duration(rand.Float64()*jitterPercent*float64(baseDelay)) - time.Duration(jitterPercent*float64(baseDelay)/2)
+	return baseDelay + jitter
+}
+
+func (c *Consumer) Consume(ctx context.Context, queues ...string) error {
+	err := c.AttemptConnect()
+	if err != nil {
+		return err
+	}
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		utils.ReadFromConn(ctx, c.conn, func(ctx context.Context, conn net.Conn, message []byte) error {
+			return c.readMessage(ctx, message)
+		})
+	}()
+	c.queues = slices.Compact(append(c.queues, queues...))
+	for _, q := range c.queues {
+		if err := c.subscribe(q); err != nil {
+			return fmt.Errorf("failed to connect to server for queue %s: %v", q, err)
+		}
+	}
+	wg.Wait()
+	return nil
+}
+
+func (c *Consumer) RegisterHandler(queue string, handler Handler) {
+	c.handlers[queue] = handler
+}
diff --git a/broker/dag.go b/dag.go
similarity index 98%
rename from broker/dag.go
rename to dag.go
index 431601e..8603ac3 100644
--- a/broker/dag.go
+++ b/dag.go
@@ -1,4 +1,4 @@
-package broker
+package mq
 
 import (
 	"context"
@@ -124,7 +124,6 @@ func (dag *DAG) AddEdge(fromNodeID, toNodeID string) error {
 		return err
 	}
 	dag.edges = append(dag.edges, []string{fromNodeID, toNodeID})
-	fmt.Printf("Edge added from %s to %s\n", fromNodeID, toNodeID)
 	return nil
 }
 
diff --git a/examples/consumer.go b/examples/consumer.go
index 6020e2e..0618965 100644
--- a/examples/consumer.go
+++ b/examples/consumer.go
@@ -3,19 +3,18 @@ package main
 import (
 	"context"
 	"fmt"
-
-	"github.com/oarkflow/mq/broker"
+	"github.com/oarkflow/mq"
 )
 
 func main() {
-	consumer := broker.NewConsumer(":8080")
-	consumer.RegisterHandler("queue1", func(ctx context.Context, task broker.Task) broker.Result {
+	consumer := mq.NewConsumer(":8080")
+	consumer.RegisterHandler("queue1", func(ctx context.Context, task mq.Task) mq.Result {
 		fmt.Println("Handling task for queue1:", task.ID)
-		return broker.Result{Payload: task.Payload, MessageID: task.ID}
+		return mq.Result{Payload: task.Payload, MessageID: task.ID}
 	})
-	consumer.RegisterHandler("queue2", func(ctx context.Context, task broker.Task) broker.Result {
+	consumer.RegisterHandler("queue2", func(ctx context.Context, task mq.Task) mq.Result {
 		fmt.Println("Handling task for queue2:", task.ID)
-		return broker.Result{Payload: task.Payload, MessageID: task.ID}
+		return mq.Result{Payload: task.Payload, MessageID: task.ID}
 	})
 	consumer.Consume(context.Background(), "queue2", "queue1")
 }
diff --git a/examples/dag.go b/examples/dag.go
index 2588f79..0b0aef8 100644
--- a/examples/dag.go
+++ b/examples/dag.go
@@ -4,12 +4,11 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"github.com/oarkflow/mq"
 	"time"
-
-	"github.com/oarkflow/mq/broker"
 )
 
-func handleNode1(_ context.Context, task broker.Task) broker.Result {
+func handleNode1(_ context.Context, task mq.Task) mq.Result {
 	result := []map[string]string{
 		{"field": "facility", "item": "item1"},
 		{"field": "facility", "item": "item2"},
@@ -18,18 +17,18 @@ func handleNode1(_ context.Context, task broker.Task) broker.Result {
 	var payload string
 	err := json.Unmarshal(task.Payload, &payload)
 	if err != nil {
-		return broker.Result{Status: "fail", Payload: json.RawMessage(`{"field": "node1", "item": "error"}`)}
+		return mq.Result{Status: "fail", Payload: json.RawMessage(`{"field": "node1", "item": "error"}`)}
 	}
 	fmt.Printf("Processing task at node1: %s\n", string(task.Payload))
 	bt, _ := json.Marshal(result)
-	return broker.Result{Status: "completed", Payload: bt}
+	return mq.Result{Status: "completed", Payload: bt}
 }
 
-func handleNode2(_ context.Context, task broker.Task) broker.Result {
+func handleNode2(_ context.Context, task mq.Task) mq.Result {
 	var payload map[string]string
 	err := json.Unmarshal(task.Payload, &payload)
 	if err != nil {
-		return broker.Result{Status: "fail", Payload: json.RawMessage(`{"field": "node2", "item": "error"}`)}
+		return mq.Result{Status: "fail", Payload: json.RawMessage(`{"field": "node2", "item": "error"}`)}
 	}
 	status := "fail"
 	if payload["item"] == "item2" {
@@ -37,24 +36,24 @@ func handleNode2(_ context.Context, task broker.Task) broker.Result {
 	}
 	fmt.Printf("Processing task at node2: %s %s\n", payload, status)
 	bt, _ := json.Marshal(payload)
-	return broker.Result{Status: status, Payload: bt}
+	return mq.Result{Status: status, Payload: bt}
 }
 
-func handleNode3(_ context.Context, task broker.Task) broker.Result {
+func handleNode3(_ context.Context, task mq.Task) mq.Result {
 	result := `{"field": "node3", "item": %s}`
 	fmt.Printf("Processing task at node3: %s\n", string(task.Payload))
-	return broker.Result{Status: "completed", Payload: json.RawMessage(fmt.Sprintf(result, string(task.Payload)))}
+	return mq.Result{Status: "completed", Payload: json.RawMessage(fmt.Sprintf(result, string(task.Payload)))}
 }
 
-func handleNode4(_ context.Context, task broker.Task) broker.Result {
+func handleNode4(_ context.Context, task mq.Task) mq.Result {
 	result := `{"field": "node4", "item": %s}`
 	fmt.Printf("Processing task at node4: %s\n", string(task.Payload))
-	return broker.Result{Status: "completed", Payload: json.RawMessage(fmt.Sprintf(result, string(task.Payload)))}
+	return mq.Result{Status: "completed", Payload: json.RawMessage(fmt.Sprintf(result, string(task.Payload)))}
 }
 
 func main() {
 	ctx := context.Background()
-	d := broker.NewDAG(":8082", false)
+	d := mq.NewDAG(":8082", false)
 
 	d.AddNode("node1", handleNode1, true)
 	d.AddNode("node2", handleNode2)
@@ -75,7 +74,7 @@ func main() {
 			fmt.Println("Error starting DAG:", err)
 		}
 	}()
-	result := d.ProcessTask(ctx, broker.Task{Payload: []byte(`"Start processing"`)})
+	result := d.ProcessTask(ctx, mq.Task{Payload: []byte(`"Start processing"`)})
 	fmt.Println(string(result.Payload))
 	time.Sleep(50 * time.Second)
 }
diff --git a/examples/server.go b/examples/server.go
index e19ede6..afdcc06 100644
--- a/examples/server.go
+++ b/examples/server.go
@@ -3,13 +3,12 @@ package main
 import (
 	"context"
 	"fmt"
+	"github.com/oarkflow/mq"
 	"time"
-
-	"github.com/oarkflow/mq/broker"
 )
 
 func main() {
-	b := broker.NewBroker(func(ctx context.Context, task *broker.Task) error {
+	b := mq.NewBroker(func(ctx context.Context, task *mq.Task) error {
 		fmt.Println("Received task", task.ID, string(task.Payload), string(task.Result), task.Error, task.CurrentQueue)
 		return nil
 	})
@@ -17,11 +16,11 @@ func main() {
 	b.NewQueue("queue2")
 	go func() {
 		for i := 0; i < 10; i++ {
-			b.Publish(context.Background(), broker.Task{
+			b.Publish(context.Background(), mq.Task{
 				ID:      fmt.Sprint(i),
 				Payload: []byte(`"Hello"`),
 			}, "queue1")
-			b.Publish(context.Background(), broker.Task{
+			b.Publish(context.Background(), mq.Task{
 				ID:      fmt.Sprint(i),
 				Payload: []byte(`"World"`),
 			}, "queue2")