Simple Message Queue (formerly MNS):Topic-related terms

topic

• The destination address where published messages are sent and stored. Publishers send messages to topics and subscribers receive messages from the topics.

Account

• The ID of an Alibaba Cloud account.

publisher

• The client that sends messages to a topic.

subscriber

• The client that receives messages from a topic. By default, a topic owner is authorized to create subscriptions to the topic.

subscription

• A subscription must be created if a subscriber client wants to receive messages that are published to a topic.

message filtering tag

• The tag that is used to filter messages. Only the messages that have the same tag can be pushed.

endpoint

• The endpoint that is used by a subscriber to receive messages from a topic.

TopicURL

• The endpoint of Simple Message Queue (formerly MNS) is in the http://$AccountId.mns.$Region.aliyuncs.com/topics/$TopicName format.
  • $accountID specifies the ID of your Alibaba Cloud account.
  • $Region specifies the region where Simple Message Queue (formerly MNS) is deployed, such as China (Beijing), China (Hangzhou), and China (Qingdao).
  • $TopicName specifies the name of a topic.

message ID

• A message ID is used to identify a message in a topic. Message IDs are unique within each topic, but are not unique across topics.