Simple Message Queue (SMQ, formerly MNS) provides API operations for managing queues and topics.
SMQ provides the following types of API operations:
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API operations that are used to manage queues
Queues support point-to-point messaging. The receiver client polls the queue to pull messages.
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API operations that are used to manage topics
Topics support one-to-many messaging. The sender client pushes messages to a topic, and subscriber clients listen for messages from the topic.