Event-driven architecture in serverless is a design pattern where functions execute in response to events from various sources, creating loosely coupled, scalable systems. Key concepts:
Events: Triggers that initiate function execution (HTTP requests, file uploads, database changes)
Event sources: Services that generate events (API Gateway, S3, DynamoDB)
Event handlers: Functions that process specific event types
Asynchronous processing: Events can be processed independently and in parallel Benefits:
Loose coupling: Services don't need direct knowledge of each other
Scalability: Each component scales independently
Resilience: Failure in one component doesn't affect others
Flexibility: Easy to add new event handlers without modifying existing code Example flow:
User uploads file to S3
S3 generates an event
Lambda function processes the file
Function writes results to DynamoDB
DynamoDB triggers another function for notifications
Rewriting in plainer words…
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