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Event-Driven Agents

Build reactive systems that respond to real-time events and triggers

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Publish-Subscribe Patterns

Pub-Sub (Publish-Subscribe) decouples event producers from consumers. Publishers emit events to topics without knowing who's listening. Subscribers express interest in topics and receive relevant events automatically.

This pattern is fundamental for building scalable agent systems where multiple agents need to react to the same events without tight coupling.

Interactive: Pub-Sub Message Broker

Publish messages to topics and watch which subscribers receive them. Toggle subscribers on/off to see how the system adapts.

PUBLISHERS (Topics)

SUBSCRIBERS (Agents)

Email Agent
Listening: user_signup, order_complete
Analytics Agent
Listening: user_signup, page_view, order_complete
Notification Agent
Listening: order_complete, payment_failed

MESSAGE LOG

Publish a message to see it delivered to subscribers...

Pub-Sub Benefits

🔌
Loose Coupling
Publishers don't know about subscribers
📈
Scalability
Add/remove subscribers without code changes
🎯
Filtering
Subscribers only receive relevant events

Real-World Uses

Microservices
Services communicate via message brokers (Kafka, RabbitMQ)
Real-Time Updates
Push notifications to multiple clients simultaneously
Event Sourcing
Store events for replay and audit trails

💡 Key Insight

Pub-Sub enables broadcast communication without direct connections. A single "order_complete" event can trigger email notifications, analytics updates, inventory adjustments, and recommendation engine refreshes—all without the publisher knowing or caring about these downstream consumers. This is how large-scale systems stay flexible and maintainable.

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