![]() Topics provide a robust and scalable messaging infrastructure for building distributed systems, where multiple services or systems can subscribe to a topic and receive messages that are relevant to them. Topics also provide a feature called Session-based messaging, which allows for guaranteed ordering of messages, and the ability to send and receive messages in a stateful manner. Subscribers can create multiple subscriptions to a topic, each with its own filter, to receive only the messages that are of interest to them. Subscriptions are used to filter messages that are delivered to the subscribers. When a message is sent to a topic, it is automatically broadcast to all subscribers that have a subscription to that topic. Topics are built on top of Azure Service Bus Queues and provide additional functionality for publish/subscribe messaging patterns. TopicsĪn Azure Service Bus Topic is a messaging entity that allows for one-to-many messaging, where a message is delivered to multiple subscribers. The send and publish topologies are extended to support the Azure Service Bus features, and make it possible to configure how topics are created. Additionally, it offers a dead letter queue, which is a special queue that stores undelivered or expired messages. Service Bus also provides advanced features such as partitioning and auto-scaling, which allow for high availability and scalability. Topics and subscriptions provide one-to-many messaging, where a message is delivered to multiple subscribers. Queues provide one-to-one messaging, where each message is consumed by a single receiver. ![]() With Service Bus, you can create messaging entities such as queues, topics, and subscriptions. It supports a variety of messaging patterns, including queuing, publish/subscribe, and request/response. It offers a reliable and secure platform for asynchronous transfer of data and state. Azure Service Bus is a messaging service from Microsoft Azure that allows for communication between decoupled systems.
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