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Producing well-structured events * 2. Determining when events should be published * 3. Ensuring events contain all necessary information * 4. NOT knowing who receives the events */ interface IPublisher { /** * Publishes an event to all interested subscribers. * The publisher does NOT maintain a list of subscribers directly. * Instead, it delegates to an intermediary (event bus/dispatcher). */ publish(event: TEvent): void; } /** * Domain Event: A well-structured event with required metadata */ interface DomainEvent { readonly eventId: string; // Unique identifier readonly eventType: string; // Type discriminator readonly occurredAt: Date; // When the event happened readonly aggregateId: string; // Source entity identifier readonly version: number; // Event schema version readonly payload: unknown; // Event-specific data } /** * Example: OrderService as a Publisher * * This service publishes events about order lifecycle changes. * It has NO knowledge of who is listening. */ class OrderService implements IPublisher { constructor( private readonly eventBus: IEventBus, private readonly orderRepository: IOrderRepository ) {} async placeOrder(command: PlaceOrderCommand): Promise { // Business logic: create and validate order const order = new Order(command.customerId, command.items); order.calculateTotals(); order.validate(); // Persist the order await this.orderRepository.save(order); // Publish event - publisher doesn't know or care who receives this this.publish({ eventId: generateUUID(), eventType: "OrderPlaced", occurredAt: new Date(), aggregateId: order.id, version: 1, payload: { orderId: order.id, customerId: order.customerId, items: order.items, totalAmount: order.totalAmount, currency: order.currency } }); return order; } publish(event: DomainEvent): void { // Delegate to event bus - maintains single responsibility this.eventBus.publish(event); } }73:Ta90,""" Publisher Interface: The Contract for Event Producers A publisher is responsible for: 1. Producing well-structured events 2. Determining when events should be published 3. Ensuring events contain all necessary information 4. NOT knowing who receives the events """ from abc import ABC, abstractmethod from dataclasses import dataclass, field from datetime import datetime from typing import Any, Generic, TypeVar from uuid import uuid4 TEvent = TypeVar('TEvent') class Publisher(ABC, Generic[TEvent]): """ Publisher Interface: Components implement this to publish events. The publisher does NOT maintain a list of subscribers directly. """ @abstractmethod def publish(self, event: TEvent) -> None: """ Publishes an event to all interested subscribers. Delegates to an intermediary (event bus/dispatcher). """ pass @dataclass(frozen=True) # Immutable event class DomainEvent: """ Domain Event: A well-structured event with required metadata """ event_id: str = field(default_factory=lambda: str(uuid4())) event_type: str = "" occurred_at: datetime = field(default_factory=datetime.utcnow) aggregate_id: str = "" version: int = 1 payload: dict = field(default_factory=dict) class OrderService(Publisher[DomainEvent]): """ Example: OrderService as a Publisher This service publishes events about order lifecycle changes. It has NO knowledge of who is listening. """ def __init__(self, event_bus: 'EventBus', order_repository: 'OrderRepository'): self._event_bus = event_bus self._order_repository = order_repository def place_order(self, command: 'PlaceOrderCommand') -> 'Order': # Business logic: create and validate order order = Order( customer_id=command.customer_id, items=command.items ) order.calculate_totals() order.validate() # Persist the order self._order_repository.save(order) # Publish event - publisher doesn't know or care who receives this self.publish(DomainEvent( event_type="OrderPlaced", aggregate_id=order.id, payload={ "order_id": order.id, "customer_id": order.customer_id, "items": order.items, "total_amount": order.total_amount, "currency": order.currency } )) return order def publish(self, event: DomainEvent) -> None: # Delegate to event bus - maintains single responsibility self._event_bus.publish(event)74:T830,// ❌ BAD: Insufficient context - subscribers must query for details interface OrderPlacedEventPoor { orderId: string; // Only an ID - subscribers need to query for everything else } // ✅ GOOD: Self-contained event with full context interface OrderPlacedEvent { // Core identifiers orderId: string; customerId: string; // Order details - no need to query items: Array<{ productId: string; productName: string; // Include name, not just ID quantity: number; unitPrice: number; currency: string; }>; // Calculated totals subtotal: number; taxAmount: number; shippingCost: number; totalAmount: number; currency: string; // Customer context for personalization customerEmail: string; customerName: string; shippingAddress: Address; // Temporal information orderedAt: Date; estimatedDelivery: Date; // Metadata orderSource: 'web' | 'mobile' | 'api' | 'phone'; promotionCodes: string[]; } // ✅ EVEN BETTER: Snapshot of state at event time interface OrderPlacedEventWithSnapshot { // The event itself orderId: string; occurredAt: Date; // Snapshot of order at this point in time orderSnapshot: OrderSnapshot; // Snapshot of customer at this point in time // Critical: prices and addresses may change later customerSnapshot: { id: string; name: string; email: string; membershipTier: string; address: Address; }; // Snapshot of catalog prices at order time itemSnapshots: Array<{ productId: string; name: string; priceAtOrderTime: number; // Captured price, not current price catalogPriceAtOrderTime: number; }>; } /** * Why snapshots matter: * * If a subscriber processes an OrderPlaced event days later * (due to backlog, retry, or replay), the current product * prices and customer address may have changed. The snapshot * ensures the event represents the exact state at occurrence time. */75:T6aa,/** * Immutable Event Design * * All properties are readonly, ensuring the event cannot be * modified after creation. This is enforced at the type level. */ interface ImmutableOrderPlacedEvent { readonly eventId: string; readonly eventType: 'OrderPlaced'; readonly occurredAt: Date; readonly aggregateId: string; readonly version: number; readonly payload: Readonly<{ orderId: string; customerId: string; items: ReadonlyArray>; totalAmount: number; }>; } /** * Factory function to create immutable events * Uses Object.freeze for runtime immutability enforcement */ function createOrderPlacedEvent( orderId: string, customerId: string, items: OrderItem[], totalAmount: number ): ImmutableOrderPlacedEvent { const event = { eventId: generateUUID(), eventType: 'OrderPlaced' as const, occurredAt: new Date(), aggregateId: orderId, version: 1, payload: { orderId, customerId, items: Object.freeze([...items]), // Deep freeze array totalAmount } }; // Freeze the entire object tree return deepFreeze(event); } function deepFreeze(obj: T): Readonly { Object.keys(obj).forEach(key => { const value = (obj as any)[key]; if (value && typeof value === 'object') { deepFreeze(value); } }); return Object.freeze(obj); } // Attempting to modify throws in strict mode const event = createOrderPlacedEvent('order-123', 'cust-456', [], 100); // event.payload.totalAmount = 200; // ❌ TypeScript error + runtime error76:T6e9,""" Immutable Event Design in Python All properties are readonly, ensuring the event cannot be modified after creation. Uses @dataclass(frozen=True) for enforcement. """ from dataclasses import dataclass, field from datetime import datetime from typing import Tuple, Any from uuid import uuid4 @dataclass(frozen=True) # frozen=True makes all fields read-only class OrderItem: """Immutable order item.""" product_id: str product_name: str quantity: int unit_price: float @dataclass(frozen=True) class OrderPlacedEvent: """ Immutable Event: Once created, cannot be modified. Using frozen=True enforces immutability at runtime. Using Tuple instead of List ensures the collection is immutable. """ event_id: str = field(default_factory=lambda: str(uuid4())) event_type: str = "OrderPlaced" occurred_at: datetime = field(default_factory=datetime.utcnow) aggregate_id: str = "" version: int = 1 # Use Tuple for immutable collections (List would be mutable) order_id: str = "" customer_id: str = "" items: Tuple[OrderItem, ...] = field(default_factory=tuple) total_amount: float = 0.0 def create_order_placed_event( order_id: str, customer_id: str, items: list[OrderItem], total_amount: float ) -> OrderPlacedEvent: """Factory function to create immutable events.""" return OrderPlacedEvent( aggregate_id=order_id, order_id=order_id, customer_id=customer_id, items=tuple(items), # Convert list to immutable tuple total_amount=total_amount ) # Attempting to modify raises an error event = create_order_placed_event("order-123", "cust-456", [], 100.0) # event.total_amount = 200.0 # ❌ FrozenInstanceError!77:Tdf8,/** * Subscriber Interface: The Contract for Event Consumers * * A subscriber is responsible for: * 1. Declaring which events it handles * 2. Processing events when they arrive * 3. Handling failures gracefully * 4. Being idempotent when necessary * 5. NOT knowing who produces the events */ interface ISubscriber { /** * Returns the event types this subscriber handles. * Used by the event bus for routing. */ subscribedEventTypes(): string[]; /** * Handles an incoming event. * Must be idempotent for reliable message delivery. */ handle(event: TEvent): Promise; /** * Optional: Priority for ordering among subscribers * Lower numbers = higher priority = earlier execution */ priority?: number; } /** * Example: EmailNotificationSubscriber * * Listens for order events and sends appropriate emails. * Has NO knowledge of who publishes these events. */ class EmailNotificationSubscriber implements ISubscriber { constructor( private readonly emailService: IEmailService, private readonly templateEngine: ITemplateEngine, private readonly customerRepository: ICustomerRepository ) {} subscribedEventTypes(): string[] { return [ 'OrderPlaced', 'OrderShipped', 'OrderDelivered', 'OrderCancelled' ]; } async handle(event: DomainEvent): Promise { // Route to specific handler based on event type switch (event.eventType) { case 'OrderPlaced': await this.handleOrderPlaced(event); break; case 'OrderShipped': await this.handleOrderShipped(event); break; case 'OrderDelivered': await this.handleOrderDelivered(event); break; case 'OrderCancelled': await this.handleOrderCancelled(event); break; } } private async handleOrderPlaced(event: DomainEvent): Promise { const payload = event.payload as OrderPlacedPayload; // Use event data directly - no need to query publisher const html = await this.templateEngine.render('order-confirmation', { orderId: payload.orderId, customerName: payload.customerName, items: payload.items, totalAmount: payload.totalAmount, estimatedDelivery: payload.estimatedDelivery }); await this.emailService.send({ to: payload.customerEmail, subject: `Order Confirmation #${payload.orderId}`, html }); } private async handleOrderShipped(event: DomainEvent): Promise { const payload = event.payload as OrderShippedPayload; const html = await this.templateEngine.render('order-shipped', { orderId: payload.orderId, trackingNumber: payload.trackingNumber, carrier: payload.carrier, estimatedDelivery: payload.estimatedDelivery }); await this.emailService.send({ to: payload.customerEmail, subject: `Your Order #${payload.orderId} Has Shipped!`, html }); } // Additional handlers... private async handleOrderDelivered(event: DomainEvent): Promise { /* ... */ } private async handleOrderCancelled(event: DomainEvent): Promise { /* ... */ } }78:Tf68,""" Subscriber Interface: The Contract for Event Consumers A subscriber is responsible for: 1. Declaring which events it handles 2. Processing events when they arrive 3. Handling failures gracefully 4. Being idempotent when necessary 5. NOT knowing who produces the events """ from abc import ABC, abstractmethod from typing import Generic, TypeVar, List TEvent = TypeVar('TEvent') class Subscriber(ABC, Generic[TEvent]): """ Subscriber Interface: Components implement this to consume events. """ @abstractmethod def subscribed_event_types(self) -> List[str]: """ Returns the event types this subscriber handles. Used by the event bus for routing. """ pass @abstractmethod async def handle(self, event: TEvent) -> None: """ Handles an incoming event. Must be idempotent for reliable message delivery. """ pass @property def priority(self) -> int: """ Optional: Priority for ordering among subscribers. Lower numbers = higher priority = earlier execution. """ return 100 # Default priority class EmailNotificationSubscriber(Subscriber['DomainEvent']): """ Example: EmailNotificationSubscriber Listens for order events and sends appropriate emails. Has NO knowledge of who publishes these events. """ def __init__( self, email_service: 'EmailService', template_engine: 'TemplateEngine', customer_repository: 'CustomerRepository' ): self._email_service = email_service self._template_engine = template_engine self._customer_repository = customer_repository def subscribed_event_types(self) -> List[str]: return [ 'OrderPlaced', 'OrderShipped', 'OrderDelivered', 'OrderCancelled' ] async def handle(self, event: 'DomainEvent') -> None: # Route to specific handler based on event type handlers = { 'OrderPlaced': self._handle_order_placed, 'OrderShipped': self._handle_order_shipped, 'OrderDelivered': self._handle_order_delivered, 'OrderCancelled': self._handle_order_cancelled, } handler = handlers.get(event.event_type) if handler: await handler(event) async def _handle_order_placed(self, event: 'DomainEvent') -> None: payload = event.payload # Use event data directly - no need to query publisher html = await self._template_engine.render('order-confirmation', { 'order_id': payload['order_id'], 'customer_name': payload['customer_name'], 'items': payload['items'], 'total_amount': payload['total_amount'], 'estimated_delivery': payload['estimated_delivery'] }) await self._email_service.send( to=payload['customer_email'], subject=f"Order Confirmation #{payload['order_id']}", html=html ) async def _handle_order_shipped(self, event: 'DomainEvent') -> None: payload = event.payload html = await self._template_engine.render('order-shipped', { 'order_id': payload['order_id'], 'tracking_number': payload['tracking_number'], 'carrier': payload['carrier'], 'estimated_delivery': payload['estimated_delivery'] }) await self._email_service.send( to=payload['customer_email'], subject=f"Your Order #{payload['order_id']} Has Shipped!", html=html ) # Additional handlers... async def _handle_order_delivered(self, event: 'DomainEvent') -> None: pass async def _handle_order_cancelled(self, event: 'DomainEvent') -> None: pass79:Tbac,/** * Idempotent Subscriber Pattern * * Uses event ID tracking to ensure each event is processed exactly once, * even if delivered multiple times. */ class IdempotentInventorySubscriber implements ISubscriber { constructor( private readonly inventoryService: IInventoryService, private readonly processedEvents: IProcessedEventStore ) {} subscribedEventTypes(): string[] { return ['OrderPlaced', 'OrderCancelled']; } async handle(event: DomainEvent): Promise { // Idempotency check: have we processed this exact event before? if (await this.processedEvents.exists(event.eventId)) { console.log(`Event ${event.eventId} already processed, skipping`); return; // Skip duplicate } try { // Process the event await this.processEvent(event); // Mark as processed (with TTL for storage efficiency) await this.processedEvents.markProcessed(event.eventId, { processedAt: new Date(), eventType: event.eventType, ttlDays: 7 // Keep for 7 days for deduplication }); } catch (error) { // Don't mark as processed - allow retry throw error; } } private async processEvent(event: DomainEvent): Promise { switch (event.eventType) { case 'OrderPlaced': await this.reserveInventory(event); break; case 'OrderCancelled': await this.releaseInventory(event); break; } } private async reserveInventory(event: DomainEvent): Promise { const payload = event.payload as OrderPlacedPayload; for (const item of payload.items) { // Idempotent operation: uses orderId as reservation key // Multiple calls with same orderId won't double-reserve await this.inventoryService.reserve({ productId: item.productId, quantity: item.quantity, reservationKey: `${payload.orderId}:${item.productId}`, expiresAt: addHours(new Date(), 24) }); } } private async releaseInventory(event: DomainEvent): Promise { const payload = event.payload as OrderCancelledPayload; // Release by reservation key - idempotent await this.inventoryService.releaseByOrderId(payload.orderId); } } /** * Processed Event Store: Tracks which events have been handled */ interface IProcessedEventStore { exists(eventId: string): Promise; markProcessed(eventId: string, metadata: ProcessedMetadata): Promise; } // Implementation options: // - Redis SET with TTL // - Database table with unique constraint on eventId // - Bloom filter for approximate deduplication (memory-efficient)7a:Tac4,/** * Resilient Subscriber with Proper Error Handling * * Implements retry logic, circuit breaking, and graceful degradation. */ class ResilientAnalyticsSubscriber implements ISubscriber { private readonly maxRetries = 3; private readonly retryDelayMs = 1000; constructor( private readonly analyticsClient: IAnalyticsClient, private readonly deadLetterQueue: IDeadLetterQueue, private readonly circuitBreaker: ICircuitBreaker, private readonly logger: ILogger ) {} subscribedEventTypes(): string[] { return ['OrderPlaced', 'OrderShipped', 'OrderDelivered']; } async handle(event: DomainEvent): Promise { // Check circuit breaker state if (!this.circuitBreaker.isAllowed()) { this.logger.warn(`Circuit open, queueing event ${event.eventId} for later`); await this.deadLetterQueue.enqueue(event, 'circuit-open'); return; } let lastError: Error | null = null; for (let attempt = 1; attempt <= this.maxRetries; attempt++) { try { await this.trackEvent(event); this.circuitBreaker.recordSuccess(); return; // Success - exit retry loop } catch (error) { lastError = error as Error; this.circuitBreaker.recordFailure(); if (attempt < this.maxRetries) { // Exponential backoff await this.sleep(this.retryDelayMs * Math.pow(2, attempt - 1)); } } } // All retries exhausted - send to dead letter queue this.logger.error(`Failed to process event ${event.eventId} after ${this.maxRetries} attempts`, lastError); await this.deadLetterQueue.enqueue(event, lastError?.message || 'unknown-error'); // Don't throw - other subscribers should continue processing // The event is safely stored in DLQ for later investigation/replay } private async trackEvent(event: DomainEvent): Promise { const payload = event.payload as OrderEventPayload; await this.analyticsClient.track({ eventName: event.eventType, userId: payload.customerId, properties: { orderId: payload.orderId, amount: payload.totalAmount, currency: payload.currency, itemCount: payload.items?.length }, timestamp: event.occurredAt }); } private sleep(ms: number): Promise { return new Promise(resolve => setTimeout(resolve, ms)); } }7b:T9cc,/** * One-to-Many Broadcasting Example * * OrderService publishes once. Multiple subscribers react independently. */ // Publisher: Publishes OrderPlaced event ONCE class OrderService { async placeOrder(command: PlaceOrderCommand): Promise { const order = await this.createOrder(command); // Single publish - doesn't know who listens this.eventBus.publish(createOrderPlacedEvent(order)); return order; } } // Subscriber 1: Sends confirmation email class EmailSubscriber implements ISubscriber { async handle(event: DomainEvent): Promise { if (event.eventType === 'OrderPlaced') { await this.sendConfirmationEmail(event.payload); } } } // Subscriber 2: Reserves inventory class InventorySubscriber implements ISubscriber { async handle(event: DomainEvent): Promise { if (event.eventType === 'OrderPlaced') { await this.reserveItems(event.payload.items); } } } // Subscriber 3: Tracks analytics class AnalyticsSubscriber implements ISubscriber { async handle(event: DomainEvent): Promise { if (event.eventType === 'OrderPlaced') { await this.trackPurchase(event.payload); } } } // Subscriber 4: Notifies warehouse class WarehouseSubscriber implements ISubscriber { async handle(event: DomainEvent): Promise { if (event.eventType === 'OrderPlaced') { await this.createPickList(event.payload); } } } // Subscriber 5: Updates search index class SearchIndexSubscriber implements ISubscriber { async handle(event: DomainEvent): Promise { if (event.eventType === 'OrderPlaced') { await this.updateCustomerOrderHistory(event.payload); } } } // Subscriber 6: Fraud detection class FraudDetectionSubscriber implements ISubscriber { async handle(event: DomainEvent): Promise { if (event.eventType === 'OrderPlaced') { await this.analyzeForFraud(event.payload); } } } /** * RESULT: * * OrderService publishes ONE event. * SIX different subsystems react: * - Email sent * - Inventory reserved * - Analytics tracked * - Warehouse notified * - Search updated * - Fraud analyzed * * OrderService knows about NONE of these subscribers. * Adding a 7th subscriber requires ZERO changes to OrderService. */7c:T87e,// ❌ ANTI-PATTERN: Publisher knows about subscribers class CoupledOrderService { constructor( private readonly emailService: EmailService, // Direct coupling! private readonly inventoryService: InventoryService, private readonly analyticsService: AnalyticsService ) {} async placeOrder(command: PlaceOrderCommand): Promise { const order = await this.createOrder(command); // Direct calls to subscribers - defeats pub-sub entirely await this.emailService.sendConfirmation(order); await this.inventoryService.reserve(order.items); await this.analyticsService.track('OrderPlaced', order); return order; } } // ❌ ANTI-PATTERN: Non-idempotent subscriber class DangerousInventorySubscriber { async handle(event: DomainEvent): Promise { // No duplicate check! If event is delivered twice: // - First delivery: reserves 5 units // - Second delivery: reserves 5 MORE units // Result: 10 units reserved instead of 5! await this.inventoryService.decrementStock( event.payload.productId, event.payload.quantity ); } } // ❌ ANTI-PATTERN: Subscriber queries publisher class TightlyCoupledSubscriber { constructor(private readonly orderService: OrderService) {} async handle(event: DomainEvent): Promise { // Event only contains orderId - must query for details // This is temporal coupling and creates a dependency const order = await this.orderService.getOrder(event.payload.orderId); // If order data changed since publish, we get wrong data! await this.processOrder(order); } } // ❌ ANTI-PATTERN: Subscriber swallows failures class DangerousSubscriber { async handle(event: DomainEvent): Promise { try { await this.riskyOperation(event); } catch (error) { // Silently swallowed - event appears processed but wasn't! // No logging, no retry, no dead letter queue // 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36: Lld Interview Strategies 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Design (LLD)","topic":"Publish-Subscribe Pattern","title":"Publish-Subscribe Pattern","description":"Master the Publish-Subscribe architectural pattern for building loosely coupled, scalable systems. Learn how publishers and subscribers interact through event buses, achieve decoupling, and explore various implementation approaches for real-world applications.","difficulty":"INTERMEDIATE","estimatedMinutes":90,"pages":[{"id":"seed_eb66c86061ecb09002339aa30e9ba166","title":"Publisher and Subscriber Roles","order":0,"content":[{"id":"opening-hook","title":"The Foundation of Event-Driven Architecture","content":[{"data":{"content":"In the world of software architecture, few patterns are as fundamental and universally applicable as the **Publish-Subscribe** (Pub-Sub) pattern. At its core, Pub-Sub is elegantly simple: one component *publishes* information, and other components *subscribe* to receive that information—without either side needing to know about the other directly.\n\nThis deceptively simple concept forms the backbone of everything from GUI event handling to distributed microservices communication. Understanding the precise roles, responsibilities, and design principles of **publishers** and **subscribers** is essential for building systems that are scalable, maintainable, and resilient to change."},"type":"text"},{"data":{"icon":"Target","title":"What You Will Learn","content":"By the end of this page, you will have a complete understanding of publisher and subscriber roles: their responsibilities, contracts, design principles, and how they achieve complete decoupling. You'll be able to design components that participate correctly in Pub-Sub systems at any scale.","variant":"info"},"type":"callout"}]},{"id":"understanding-publisher-role","title":"Understanding the Publisher Role","content":[{"data":{"content":"A **Publisher** is any component that produces events or messages and makes them available to interested parties. The publisher's defining characteristic is that it has **no knowledge of who, if anyone, will receive its messages**. This is the fundamental principle that enables loose coupling.\n\n### The Publisher's Contract\n\nA publisher commits to a specific contract that defines what it will communicate and how:\n\n- **Event/Message Type**: The structure and semantics of what it publishes\n- **Event Timing**: When events are published (triggers, conditions)\n- **Event Guarantees**: Delivery semantics (at-least-once, at-most-once, exactly-once)\n- **Event Ordering**: Whether events maintain a particular order\n\nUnderstanding this contract is crucial because consumers depend on it. Changing a publisher's contract without careful consideration can break subscribers across the entire system."},"type":"text"},{"data":{"fileName":"publisher-interface.ts","languages":[{"code":"$72","label":"TypeScript","value":"typescript"},{"code":"$73","label":"Python","value":"python"}]},"type":"code"},{"data":{"icon":"Lightbulb","title":"Publisher Responsibility Principle","content":"A publisher's sole event-related responsibility is to create and emit events that accurately represent what happened. It should never contain logic about what *should* happen as a result of the event—that's the subscriber's domain.","variant":"tip"},"type":"callout"}],"titleType":"number","titleNumber":1},{"id":"publisher-design-principles","title":"Publisher Design Principles","content":[{"data":{"content":"Designing effective publishers requires adherence to several key principles that ensure the events they produce are useful, reliable, and maintainable.\n\n### Principle 1: Publish Facts, Not Commands\n\nPublishers should emit events that describe **what happened** (past tense), not what should happen (imperative). This subtle distinction has profound implications for system design."},"type":"text"},{"data":{"left":[{"data":{"items":["`SendEmailToCustomer`","`UpdateInventoryStock`","`NotifyWarehouse`","`CalculateShippingCost`","Couples publisher to specific subscribers","Publisher dictates what others should do"],"title":{"icon":"XCircle","text":"Wrong: Imperative Commands","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"accent"},"type":"list"}],"right":[{"data":{"items":["`OrderPlaced`","`PaymentReceived`","`ItemShipped`","`CustomerRegistered`","Complete decoupling from subscribers","Subscribers decide their own reactions"],"title":{"icon":"CheckCircle","text":"Right: Descriptive Events","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"}]},"type":"two-column"},{"data":{"content":"### Principle 2: Include Sufficient Context\n\nEvents should be **self-contained**. Subscribers should not need to call back to the publisher or perform additional queries to understand the event. This principle, sometimes called *event enrichment*, reduces coupling and improves performance."},"type":"text"},{"data":{"fileName":"event-context-examples.ts","languages":[{"code":"$74","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"content":"### Principle 3: Maintain Event Immutability\n\nOnce an event is created and published, it should never be modified. Events represent historical facts—and history doesn't change. This immutability is crucial for:\n\n- **Audit trails**: Events can be trusted as records of what happened\n- **Event replay**: Systems can replay events for debugging or recovery\n- **Event sourcing**: The event log becomes the source of truth\n- **Concurrency safety**: Immutable objects are inherently thread-safe"},"type":"text"},{"data":{"fileName":"immutable-events.ts","languages":[{"code":"$75","label":"TypeScript","value":"typescript"},{"code":"$76","label":"Python","value":"python"}]},"type":"code"},{"data":{"icon":"AlertCircle","title":"Event Versioning is Critical","content":"Publishers must version their events. When the event structure needs to change, create a new version rather than modifying the existing one. This allows gradual migration and prevents breaking existing subscribers.","variant":"warning"},"type":"callout"}],"titleType":"number","titleNumber":2},{"id":"understanding-subscriber-role","title":"Understanding the Subscriber Role","content":[{"data":{"content":"A **Subscriber** (also called a *listener*, *handler*, or *consumer*) is a component that expresses interest in specific events and reacts when those events occur. Like publishers, subscribers have no direct knowledge of who produces the events they consume.\n\n### The Subscriber's Contract\n\nA subscriber commits to:\n\n- **Event Types**: Which events it will handle\n- **Processing Semantics**: How it processes events (synchronously, asynchronously)\n- **Error Handling**: What happens when processing fails\n- **Idempotency**: How it handles duplicate events\n- **Ordering Requirements**: Whether it depends on event order"},"type":"text"},{"data":{"fileName":"subscriber-interface.ts","languages":[{"code":"$77","label":"TypeScript","value":"typescript"},{"code":"$78","label":"Python","value":"python"}]},"type":"code"}],"titleType":"number","titleNumber":3},{"id":"subscriber-design-principles","title":"Subscriber Design Principles","content":[{"data":{"content":"Well-designed subscribers are essential for robust event-driven systems. Several principles guide their design.\n\n### Principle 1: Idempotency is Non-Negotiable\n\nIn distributed systems, events may be delivered more than once due to network issues, retries, or at-least-once delivery semantics. Subscribers **must** handle duplicate events gracefully."},"type":"text"},{"data":{"fileName":"idempotent-subscriber.ts","languages":[{"code":"$79","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"content":"### Principle 2: Single Responsibility Per Subscriber\n\nEach subscriber should have one clear purpose. Avoid creating \"kitchen sink\" subscribers that handle many unrelated concerns. This makes testing, maintenance, and scaling much easier."},"type":"text"},{"data":{"rows":[["**Single Purpose**","One subscriber per concern (Email, Inventory, Analytics separately)","Easy to test, modify, and scale independently","More classes to manage"],["**Multi-Purpose**","One subscriber handles email, inventory, and analytics","Fewer classes","Hard to test, violates SRP, can't scale concerns independently"]],"caption":"Single vs Multi-Purpose Subscribers","headers":["Approach","Pattern","Pros","Cons"]},"type":"table"},{"data":{"content":"### Principle 3: Fail Gracefully and Independently\n\nA failing subscriber should not affect other subscribers. Each subscriber operates in isolation—if email sending fails, inventory updates should still proceed."},"type":"text"},{"data":{"fileName":"resilient-subscriber.ts","languages":[{"code":"$7a","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"icon":"Info","title":"Dead Letter Queues","content":"A Dead Letter Queue (DLQ) stores events that couldn't be processed after all retries. This prevents event loss and allows for manual investigation, bug fixes, and replay. Never silently discard failed events in production systems.","variant":"note"},"type":"callout"}],"titleType":"number","titleNumber":4},{"id":"publisher-subscriber-relationship","title":"The Publisher-Subscriber Relationship","content":[{"data":{"content":"The relationship between publishers and subscribers is fundamentally **asymmetric** and mediated by an intermediary (the event bus or message broker). This architectural boundary is what enables the pattern's key benefits.\n\n### Relationship Characteristics"},"type":"text"},{"data":{"rows":[["**Knowledge Direction**","Knows event structure","Knows event structure"],["**Knows Other Party?**","No - publishes blindly","No - receives from bus"],["**Cardinality**","Usually 1 per event type","Many per event type"],["**Timing Control**","Controls when events fire","Reacts to events"],["**Data Flow**","Produces data","Consumes data"],["**Failure Impact**","Failures don't affect delivery","Failures affect only that subscriber"]],"caption":"Publisher vs Subscriber Characteristics","headers":["Characteristic","Publisher","Subscriber"]},"type":"table"},{"data":{"content":"### One-to-Many Broadcasting\n\nA single published event can trigger multiple independent reactions. This is fundamentally different from traditional method calls, where the caller explicitly invokes each callee."},"type":"text"},{"data":{"fileName":"one-to-many-broadcast.ts","languages":[{"code":"$7b","label":"TypeScript","value":"typescript"}]},"type":"code"},{"data":{"icon":"Sparkles","title":"The Power of Decoupling","content":"Notice that the OrderService has no idea about emails, inventory, analytics, or fraud detection. It simply announces 'an order was placed'. This is true decoupling—you can add, remove, or modify subscribers without touching the publisher.","variant":"success"},"type":"callout"}],"titleType":"number","titleNumber":5},{"id":"anti-patterns-to-avoid","title":"Anti-Patterns to Avoid","content":[{"data":{"content":"Understanding common mistakes helps avoid them. Here are critical anti-patterns in publisher and subscriber design."},"type":"text"},{"data":{"items":["**Knowing Subscribers**: Publisher maintains subscriber list or knows subscriber types. This defeats the entire purpose of pub-sub.","**Publishing Commands**: Events named like `SendEmail` or `ReserveInventory` couple publisher to subscriber actions.","**Temporal Coupling**: Event payload requires data only available at receive time (like 'current price') instead of publish time.","**Incomplete Events**: Events with only IDs that force subscribers to query back to the publisher.","**Mutable Events**: Events that can be modified after creation, breaking auditability and replay."],"title":{"icon":"XCircle","text":"Publisher Anti-Patterns","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"items":["**Non-Idempotent Handling**: Processing duplicates differently, causing data inconsistencies.","**Synchronous Blocking**: Holding up event processing with long-running operations without async handling.","**Cross-Subscriber Dependencies**: Assuming subscriber A runs before subscriber B—there are no ordering guarantees.","**Querying the Publisher**: Calling back to the publisher for additional data instead of using event payload.","**Swallowing Failures**: Catching exceptions without logging, alerting, or storing for retry.","**Side-Effect Coupling**: One subscriber's side effects required by another subscriber."],"title":{"icon":"XCircle","text":"Subscriber Anti-Patterns","type":"icon","color":"destructive","variant":"outline-circle"},"variant":"glass"},"type":"list"},{"data":{"fileName":"anti-patterns.ts","languages":[{"code":"$7c","label":"TypeScript","value":"typescript"}]},"type":"code"}],"titleType":"number","titleNumber":6},{"id":"summary","title":"Summary: Publisher and Subscriber Roles","content":[{"data":{"content":"Understanding publisher and subscriber roles is foundational to building effective event-driven systems. Let's consolidate the key principles:"},"type":"text"},{"data":{"type":"ordered","items":["**Publishers produce, subscribers consume** — Neither knows about the other directly; they communicate through an intermediary.","**Events are facts, not commands** — Publishers announce what happened; subscribers decide how to react.","**Events must be self-contained** — Include all context needed so subscribers don't query back.","**Events are immutable** — Once published, events never change; they represent historical records.","**Subscribers must be idempotent** — Handle duplicates gracefully; assume events may arrive more than once.","**Subscribers fail independently** — One subscriber's failure should not affect others.","**The relationship is one-to-many** — One event can trigger unlimited independent reactions."],"title":{"icon":"CheckCircle","text":"Key Takeaways","type":"icon","color":"primary","variant":"outline-circle"},"variant":"accent"},"type":"list"},{"data":{"content":"**What's next:**\n\nWith a solid understanding of publisher and subscriber roles, we'll explore the critical component that mediates between them: the **Event Bus** (or Dispatcher). 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