PART 5: MESSAGING & INTEGRATION SERVICES

5.1 Azure Service Bus

Overview

Enterprise message broker with queues and topics.

Entities

• Queue (point-to-point)
• Topic (pub/sub)
• Subscription

Key Features

• Sessions (FIFO)
• Dead-letter queue
• Scheduled messages
• Transactions
• Duplicate detection

Tiers

Tier	Features
Basic	Queues only
Standard	Topics, sessions
Premium	Dedicated, high performance

5.2 Azure Event Grid

Overview

Event routing service for reactive architectures.

Key Concepts

• Event Sources
• Event Handlers
• Topics
• Event Subscriptions

Key Features

• Near real-time delivery
• Event filtering
• Dead-lettering
• Serverless pricing

5.3 Azure Event Hubs

Overview

Big data streaming platform.

Key Concepts

• Partitions
• Consumer Groups
• Capture
• Partition Key

Tiers

Tier	Use Case
Basic	Simple streaming
Standard	Moderate throughput
Premium	High throughput

5.4 Azure API Management (APIM)

Overview

API gateway for publishing, securing, and managing APIs.

Components

• API Gateway
• Developer Portal
• Management Plane

Key Features

• Policies (rate limit, auth)
• Products & subscriptions
• API versioning
• Self-hosted gateway

Tiers

Tier	Use Case
Consumption	Serverless
Developer	Dev/test
Premium	Enterprise

5.5 Azure Logic Apps

Overview

Workflow automation with visual designer.

Key Features

• Triggers & Actions
• 200+ connectors
• Error handling
• Stateful vs Stateless workflows

Comparison

Feature	Consumption	Standard
Pricing	Per execution	Fixed + execution
VNet	No	Yes