How does node process concurrent requests?

Question

I have been reading nodejs lately, trying to understand how it handles multiple concurrent requests, I know nodejs is a single threaded event loop based architecture, at a g

Answer 1

You can simply create child process by shifting readImage() function in a different file using fork().

The parent file, parent.js:

const { fork } = require('child_process');
const forked = fork('child.js');
forked.on('message', (msg) => {
   console.log('Message from child', msg);
});

forked.send({ hello: 'world' });

The child file, child.js:

process.on('message', (msg) => {
  console.log('Message from parent:', msg);
});

let counter = 0;

setInterval(() => {
  process.send({ counter: counter++ });
}, 1000);

Above article might be useful to you .

In the parent file above, we fork child.js (which will execute the file with the node command) and then we listen for the message event. The message event will be emitted whenever the child uses process.send, which we’re doing every second.

To pass down messages from the parent to the child, we can execute the send function on the forked object itself, and then, in the child script, we can listen to the message event on the global process object.

When executing the parent.js file above, it’ll first send down the { hello: 'world' } object to be printed by the forked child process and then the forked child process will send an incremented counter value every second to be printed by the parent process.