Concepts

• Events: These occur when specific actions are taken on an S3 object, such as creation, deletion, restoration, or replication. An event is created for each action.
• Filtering: Events can be filtered based on certain criteria. For example, you can set up a filter to receive notifications only for objects with a .jpeg extension.
• Use Case: One common use case of S3 Event Notifications is to automate responses to S3 events. For instance, you can set up a system to generate image thumbnails every time an image is uploaded to your S3 bucket.

Practical Application

• Event Creation: You can set up notifications for specific events occurring in your S3 bucket. This is done by adding a notification configuration that identifies the events you want Amazon S3 to publish and the destinations where you want Amazon S3 to send the notifications.
• Destinations: Event notifications can be sent to various destinations including Amazon Simple Notification Service (SNS) topics, Amazon Simple Queue Service (SQS) queues, AWS Lambda functions, and Amazon EventBridge.
• Delivery: While the delivery of notifications is typically within seconds, it can sometimes take a minute or longer.

Permissions and Policies

• Resource Access Policies: You need to attach specific policies for SNS, SQS, and Lambda to allow S3 to publish events.

Event Bridge Integration

• Flow: S3 bucket events can be routed to Amazon Event Bridge, which can then send these events to various AWS services based on defined rules.
• Rules: You can define rules in Event Bridge to control the flow of events.
• Advanced Filtering: Event Bridge allows for advanced filtering based on metadata, object size, and other criteria.
• Multiple Destinations: Event Bridge supports sending events to multiple AWS service destinations simultaneously.

Summary

• Key Point: S3 Event Notifications are designed to trigger automatic actions in response to changes in S3. These notifications can be sent to various targets including SQS, SNS, Lambda, and Amazon Event Bridge.
• Next Steps: After understanding the basics of S3 Event Notifications, you can explore more advanced topics or start implementing this feature in your own projects.