Day 16: AWS | SNS (Simple Notification Service)

What is SNS?

• Amazon Simple Notification Service (SNS) is a fully managed messaging service provided by Amazon Web Services (AWS).

• It enables you to build distributed and decoupled applications by allowing communication between different components or microservices.

• SNS supports both pub/sub (publish/subscribe) and point-to-point messaging models.

What all are features of SNS?

• Topics:

  • A topic is a communication channel to which messages can be sent.

  • Publishers send messages to topics, and subscribers receive messages from topics.

  • Subscribers can be endpoints such as Amazon Simple Queue Service (SQS) queues, AWS Lambda functions, HTTP/S endpoints, email/SMTP, and more.

• Publishers:

  • Publishers are entities that send messages to SNS topics.

  • Messages can be in various formats, including text, JSON, or binary.

• Subscribers:

  • Subscribers are entities that receive and process messages from SNS topics.

  • Each subscriber must have a protocol and endpoint type associated with it.

• Protocols and Endpoints:

  • SNS supports various protocols for delivering messages, including:

    • Amazon Simple Queue Service (SQS)

    • AWS Lambda functions

    • HTTP/HTTPS endpoints

    • Email/SMTP

    • Short Message Service (SMS)

    • Application (for sending messages to mobile devices)

• Message Filtering:

  • SNS allows you to filter messages based on attributes to control which subscribers receive specific messages.

• Delivery Retry:

  • SNS automatically retries message deliveries if the initial attempt fails.

• Message Attributes:

  • Messages can have optional attributes associated with them, providing additional metadata.