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Basic concepts of the topic-based model

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This topic defines the key terms related to the topic-based model of Simple Message Queue (formerly MNS). Understanding these terms will help you use the topic-based model.

  • Topic

    • The destination and storage address for published messages.

  • Account

    • The Alibaba Cloud account ID of a user.

  • Publisher

    • A client that publishes messages to a topic.

  • Subscriber

    • A client that receives messages from a topic. By default, the topic owner has the permission to subscribe to the topic.

  • Subscription

    • A relationship between a topic and a subscriber. A subscriber must create a subscription to receive messages that are published to the topic.

  • Message filtering tag (FilterTag)

    • A tag used to filter messages in a subscription. Only messages with a matching tag are pushed.

  • Endpoint

    • The address that a subscriber uses to receive messages from a topic.

  • TopicURL

    • Simple Message Queue (formerly MNS). The format is as follows: http://$AccountId.mns.$Region.aliyuncs.com/topics/$TopicName.
      • $AccountId: The Alibaba Cloud account ID.
      • $Region: The region where the Simple Message Queue (formerly MNS) service is available.
      • $TopicName: The name of the topic.

  • Message ID

    • An ID that identifies a message in a topic. The message ID is unique for each message within a topic, but is not unique across different topics.
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