This article describes the terms that are related to MNS topics.
- 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 address that a subscriber client uses to receive messages from a topic, such as an HTTP endpoint, email address, or mobile number.
- TopicURL
- The access endpoint of MNS is in the
http://$AccountId.mns.$Region.aliyuncs.com/topics/$TopicNamecodeph format.- $accountID specifies the ID of your Alibaba Cloud account.
- $Region specifies the region where 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.