sparrow/pkg/protocol/message.go

package protocol

import (
	"bytes"
	"encoding/gob"
	"time"
)

type MessageSerializer interface {
	Encode() bytes.Buffer
	Decode()
}

type Message struct {
	QueueName  string
	Id         string
	Ts         *time.Time
	Type       string
	Data       string
	RuleChanId string
	RuleNodeId string
	Callback   IMessageCallBack
	MetaData   map[string]interface{}
	Originator string
}

func (a *Message) Encode() ([]byte, error) {
	var network bytes.Buffer
	enc := gob.NewEncoder(&network)
	err := enc.Encode(a)
	if err != nil {
		return nil, err
	}
	return network.Bytes(), nil
}

func (a *Message) Decode(data []byte) error {
	var network bytes.Buffer
	network.Write(data)
	dec := gob.NewDecoder(&network)
	return dec.Decode(a)
}

// IMessageCallBack message call back
type IMessageCallBack interface {
	// on success do sth.
	OnSuccess()
	// on failure do sth.
	OnFailure(err error)
	// on process start do sth.
	OnProcessingStart(ruleNodeInfo *RuleNodeInfo)
	// on process end do sth.
	OnProcessingEnd(ruleNodeId string)
}

type emptyCallBack struct {
}

func (e emptyCallBack) OnProcessingStart(ruleNodeInfo *RuleNodeInfo) {

}

func (e emptyCallBack) OnProcessingEnd(ruleNodeId string) {

}

var EmptyCallBack = emptyCallBack{}

func (e emptyCallBack) OnSuccess() {

}

func (e emptyCallBack) OnFailure(err error) {

}

// SetCallBack
func (a *Message) SetCallBack(callback IMessageCallBack) {
	a.Callback = callback
}

// GetCallBack get message call back
func (a *Message) GetCallBack() IMessageCallBack {
	if a.Callback == nil {
		return EmptyCallBack
	} else {
		return a.Callback
	}
}

func (a *Message) GetQueueName() string {
	if a.QueueName == "" {
		return "MAIN"
	}
	return a.QueueName
}

func (a *Message) CopyWithRuleChainId(ruleChainId string) *Message {
	return &Message{
		QueueName:  a.QueueName,
		Id:         a.Id,
		Ts:         a.Ts,
		Type:       a.Type,
		Data:       a.Data,
		RuleChanId: ruleChainId,
		RuleNodeId: a.RuleNodeId,
		Callback:   a.Callback,
		MetaData:   a.MetaData,
		Originator: a.Originator,
	}
}
func (a *Message) CopyWithRuleNodeId(ruleNodeId string) *Message {
	return &Message{
		QueueName:  a.QueueName,
		Id:         a.Id,
		Ts:         a.Ts,
		Type:       a.Type,
		Data:       a.Data,
		RuleChanId: a.RuleChanId,
		RuleNodeId: ruleNodeId,
		Callback:   a.Callback,
		MetaData:   a.MetaData,
		Originator: a.Originator,
	}
}