Java: Non-Blocking I/O (Event Loops)

WebFlux uses an event loop to manage I/O operations efficiently, allowing a single thread to handle multiple connections.

WebFlux uses non-blocking I/O to decouple the HTTP connection from the server's execution thread. By using an event loop, WebFlux can efficiently manage resources, utilizing a single thread to handle as many connections as possible. This is achieved by delegating tasks like database queries, and instantly returning to handle new requests. For instance, a server with four CPU cores will typically run four event loops, one per core, which can handle thousands of concurrent connections without needing a separate thread for each. This approach contrasts with traditional models that use a thread-per-request, often resulting in thread exhaustion under heavy load.