Node.js Lesson: Internals of Nodejs: LibUV

Node.js Lesson: Internals of Nodejs: LibUV

In this Node.js Lesson, we are going to talk about the internals of Nodejs. This article will guide how node js works and how it can handle async tasks. What will happen if ten requests come at once? Will it handle one request and discard the other 9? or will it create a queue and serve each one by one. We will answer all these questions in this and coming lesson. Let's start.

Hello everyone, today we are going to talk about the internals of Nodejs. This article will guide how node js works and how it can handle async tasks. What will happen if ten requests come at once? Will it handle one request and discard the other 9? or will it create a queue and serve each one by one. We will answer all these questions in this and coming lesson. Let’s start.

The main engine behind Nodejs: LibUV

LibUV is the core engine that powers Nodejs. LibUV provides support for asynchronous I/O operations. It’s a C based library primarily created for Nodejs and used by Luvit, Julia, pyuv, and some other software.

LibUV enforces an asynchronous, event-driven style of programming. It uses event loops to handle asynchronous tasks effectively. It also supports non-blocking network support, asynchronous file system access, etc.

By “event-driven” programming, we mean it watches for events to occur and then handle them when they occur. As we saw in the Event Emitter lesson earlier, we created an event listener who was “listening” to the event. We then wrote a handler function, which got called when that particular event occurs. The monitoring of events happening in the system is managed by LibUV using something that we call Event Loop. This Event Loop usually keeps running forever.

The responsibilities of LibUV are cross-platform input-output operations, handling files & networks, and support the event loop. You’re not going to interact with these yourself. Still, this knowledge is good to have to understand the working of Nodejs better. We will learn about Event Loops in the next lesson so let’s know the other now.

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