Senior LevelREST APIs & Web Services
What is the AsyncAPI specification and how does it document event-driven microservices?
❓ Interview Prompt: Explain AsyncAPI specification, documenting message-driven architectures (Kafka, RabbitMQ, WebSockets), channels, operations, and payload schemas.
While OpenAPI standardizes HTTP REST APIs, AsyncAPI is the open-source standard for documenting asynchronous, event-driven message architectures:
AsyncAPI Core Constructs:
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Channels: Message topics or queues (e.g. 'orders/v1/created').
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Operations: 'send' (publish) or 'receive' (subscribe).
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Messages & Payload Schemas: Defines JSON or Protobuf schemas of event payloads.
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Enables automated code generation for Kafka producers/consumers and interactive documentation!
Code Implementation Example
yaml
asyncapi: 3.0.0
info:
title: Order Processing Event API
version: 1.0.0
channels:
orderCreatedChannel:
address: orders.events.created
messages:
orderCreatedMessage:
payload:
type: object
properties:
orderId: { type: string }
amount: { type: number }💡AsyncAPI specification defining Kafka event channel and payload schema.
🎯 Interview Key Takeaway
Use the AsyncAPI specification to document event-driven messaging protocols (Kafka, RabbitMQ, WebSockets) across microservices.
#AsyncAPI#Event-Driven#Kafka#Senior
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