The concepts of „topic“ and „subscribe“ are often linked, especially in contexts like messaging systems, event-driven architectures, or content platforms.
- Publisher: This is the source or entity that produces messages or events. The publisher doesn’t need to know who will consume its messages.
- Topic: This acts as a channel or intermediary that categorizes messages. Publishers post messages to specific topics, and subscribers listen to those topics. It’s used in systems like message brokers (e.g., RabbitMQ, AWS SNS, Apache Kafka) to allow publishers to send messages without worrying about who will receive them.
- Subscriber: These are the entities that consume the messages from the topics they’re interested in. Subscribers can dynamically choose topics to receive only the information they need.
Amazon SNS (Simple Notification Service) Topic
Amazon SNS provides message delivery from publishers to subscribers using the pub/sub pattern. Publishers send messages to an SNS topic, and subscribers receive those messages through their chosen endpoints.