xujianhai666 commented on a change in pull request #106: [ISSUE #105] Add 
PullConsumer. resolve #105
URL: https://github.com/apache/rocketmq-client-go/pull/106#discussion_r301901521
 
 

 ##########
 File path: consumer/pull_consumer.go
 ##########
 @@ -19,40 +19,104 @@ package consumer
 
 import (
        "context"
-       "errors"
        "fmt"
-       "strconv"
        "sync"
+       "sync/atomic"
 
        "github.com/apache/rocketmq-client-go/internal"
        "github.com/apache/rocketmq-client-go/primitive"
+       "github.com/apache/rocketmq-client-go/rlog"
+       "github.com/pkg/errors"
+)
+
+var (
+       ErrMQEmpty = errors.New("MessageQueue is nil")
+       ErrOffset  = errors.New("offset < 0")
+       ErrNumbers = errors.New("numbers < 0")
 )
 
 type PullConsumer interface {
 
 Review comment:
   @wenfengwang if do like that, we will introduce the problem "import cycle", 
I put that in utils/errors.go.

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