Websocket Client endpoint in main method

client_in_main.bal

import ballerina/io;
import ballerina/http;
import ballerina/runtime;

@final string REMOTE_BACKEND_URL = "ws://localhost:15500/websocket";
boolean isComplete = false;

function main(string[] args) {
    http:WebSocketClient wsClientEp;
    http:WebSocketClientEndpointConfig wsConfig = {
        url:REMOTE_BACKEND_URL,
        callbackService:clientCallbackService
    };
    wsClientEp.init(wsConfig);
    wsClientEp.start();
    while (isComplete){
        runtime:sleepCurrentWorker(100);
    }

}

service<http:WebSocketClientService> clientCallbackService {
    onText(endpoint wsEp, string text) {
    }

    onBinary(endpoint wsEp, blob data) {
    }

    onClose(endpoint wsEp, int statusCode, string reason) {
        isComplete = true;
    }
}