Node.js socket.ref() Method
The socket.ref() method is an inbuilt application programming interface of class Socket within dgram module which is used to get the reference of the particular socket containing all the information in it.
Syntax:
const socket.ref()
Parameters: This method does not accept any parameters.
Return Value: This method returns the reference of the particular socket containing all the information in it.
Example 1: In this example, we will see the use of socket.ref() method.
Filename: index.js
Javascript
// Node.js program to demonstrate the // server.ref() method // Importing dgram module const dgram = require( 'dgram' ); // Creating and initializing client // and server socket let client = dgram.createSocket( "udp4" ); let server = dgram.createSocket( "udp4" ); // Catching the message event server.on( "message" , function (msg) { // Displaying the client message process.stdout.write( "UDP String: " + msg + "\n" ); // Exiting process process.exit(); }) // Binding server with port .bind(1234, () => { // Getting the reference of the server // by using ref() method const size = server.ref(); // Display the result console.log(size.eventNames()); }); |
Output:
[ 'message' ] UDP String: Hello
Example 2: In this example, we will see the use of socket.ref() method.
Filename: index.js
JavaScript
// Node.js program to demonstrate the // server.ref() method // Importing dgram module const dgram = require( 'dgram' ); // Creating and initializing client // and server socket let client = dgram.createSocket( "udp4" ); let server = dgram.createSocket( "udp4" ); // Catching the message event server.on( "message" , function (msg) { // Displaying the client message process.stdout.write( "UDP String: " + msg + "\n" ); // Exiting process process.exit(); }); // Catching the listening event server.on( 'listening' , () => { // Getting address information // for the server const address = server.address(); // display the result console.log(`server listening ${address.address}: $ { address.port }`); }); // Binding server with port address // by using bind() method server.bind(1234, () => { // Getting the reference of server // by using ref() method const size = server.ref(); // Display the result console.log(size.eventNames()); }); // Client sending message to server client.send( "Hello" , 0, 7, 1234, "localhost" ); |
Output:
server listening 0.0.0.0:1234 [ 'message', 'listening' ] UDP String: Hello
Run the index.js file using the following command:
node index.js
Reference: https://nodejs.org/dist/latest-v12.x/docs/api/dgram.html#dgram_socket_ref