The Hitchiker's Guide to Event Driven Architectures

Event-driven architecture (EDA) is a software architecture pattern that promotes the production, detection, consumption, and reaction to events, allowing communication between components without tight coupling.

EDA enables asynchronous, non-blocking interaction between components, improving scalability and responsiveness.

Node.js is well-suited for event-driven architecture because JavaScript is non-blocking by nature and uses an event loop to manage events, similar to an internal event-driven architecture.

The Node.js event loop is a mechanism that handles asynchronous operations by queuing and processing events, enabling non-blocking interactions within a Node.js application.

The EventEmitter is a Node.js class that allows developers to handle and emit events synchronously within an application.

In Node.js, the Pub/Sub pattern is used for communication between different applications or components, often implemented using technologies like Redis to send messages to subscribers on a channel.

Apache Kafka is a distributed event streaming platform used to build scalable, high-throughput systems. It uses brokers to manage message streams, with producers writing and consumers reading events.

Server-sent events (SSE) is a web API that allows servers to push updates to clients over a single HTTP connection, commonly used for real-time applications.

The example uses Node.js for server-side logic, Redis or Apache Kafka for message streaming, and Fastify with server-sent events for real-time client updates.

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