message = CreateMessage("topicName")

• function description
  create a message instance, by setting topic field
  

• input
  topicName: a topic name
  

• return
  a new message instance, after used it, you need call DestroyMessage(message)
  

DestroyMessage(message)

• function description
  destroy a message instance, delete memmory
  

• input
  message: message instance
  

SetMessageTopic(message, topic)

• function description
  set topic field value for the message
  

• input
  message: message instance
  topic: a topic name

SetMessageTags(message, tags)

• function description
  set tag field value for the message
  

• input
  message: message instance
  tags: tag for the topic

SetMessageKeys(message, keys)

• function description
  set key field value for the message
  

• input
  message: message instance
  keys: key for the topic

SetMessageBody(message, stringBody)

• function description
  set body for the message
  

• input
  message: message instance
  body: message body as string

SetByteMessageBody(message, byteBody, byteLength)

• function description
  set body for the message
  

• input
  message: message instance
  byteBody: message body as byte[] byteLength: byteBody's length

SetMessageProperty(message, key, value)

• function description
  set extend k-v for message
  

• input
  message: message instance
  key: string key value: string value

SetMessageDelayTimeLevel(message, level)

• function description
  set delay level
  

• input
  message: message instance
  level: delay level as int

topic = GetMessageTopic(msgExt)

• function description
  get topic name from a message instance
  

• input
  msgExt: message instance
  

• return
  topic: topic name

tag = GetMessageTags(msgExt)

• function description
  get tag from a message instance
  

• input
  msgExt: message instance
  

• return
  tag: tag

key = GetMessageKeys(msgExt)

• function description
  get message key from a message instance
  

• input
  msgExt: message instance
  

• return
  key: message key

body = GetMessageBody(msgExt)

• function description
  get message body from a message instance
  

• input
  msgExt: message instance
  

• return
  body: message body as string

value = GetMessageProperty(msgExt, key)

• function description
  get a message proprty value from a message instance
  

• input
  msgExt: message instance
  key: property key

• return
  value: property value as string

messageId = GetMessageId(msgExt)

• function description
  get a message id from a message instance
  

• input
  msgExt: message instance
  

• return
  messageId: message id as string