Hello i want to send message to all connected client but my code dont work (for one user its good)
require_once('websockets.php');
$userConnected = array();
class echoServer extends WebSocketServer {
protected function process ($user, $exec) {
foreach($userConnected as $u) {
$this->send($u,'test');
}
}
protected function connected ($user) {
array_push($userConnected, $user);
}
protected function closed ($user) {
if(($key = array_search($user, $userConnected)) !== false) {
unset($userConnected[$key]);
}
}
}
Related
I am trying to send an image by drag and drop in send message area but its failing to do so. I dont know how to send an image in this code. Can someone please help me out?
ChatEndpoint.java
This is serverendpoint of websocket.I have four methods.onOpen,onClose,onMessage and onError.I am not doing anything in onOpen method.This method gets called when websocket establishes the connection.When the websocket tries to send message to the client,onMessage method gets called.Here the message sent from the jsp page(client) sends it in json string format to the server.The object mapper converts it to java object.I have also made an enum for MessageType having two options LOGIN and MESSAGE.I am checking inf the java object matches with the login message type then it stores the name of chat user from properties of user obtained from session object.It also then sends the session object to join method where the session is added to the list of session object.It also send the message the user has joined the chat room.If messagetype is a message then it sends it to send message method of room class where the message is sent back to the client using sendText.
#ServerEndpoint(value = "/chat")
public class ChatEndpoint {
private Logger log = Logger.getLogger(ChatEndpoint.class.getSimpleName());
private Room room = Room.getRoom();
#OnOpen
public void onOpen(final Session session, EndpointConfig config) {}
#OnMessage
public void onMessage(final Session session, final String messageJson) {
ObjectMapper mapper = new ObjectMapper();
ChatMessage chatMessage = null;
try {
chatMessage = mapper.readValue(messageJson, ChatMessage.class);
} catch (IOException e) {
String message = "Badly formatted message";
try {
session.close(new CloseReason(CloseReason.CloseCodes.CANNOT_ACCEPT, message));
} catch (IOException ex) { log.severe(ex.getMessage()); }
} ;
Map<String, Object> properties = session.getUserProperties();
if (chatMessage.getMessageType() == MessageType.LOGIN) {
String name = chatMessage.getMessage();
properties.put("name", name);
room.join(session);
room.sendMessage(name + " - Joined the chat room");
}
else {
String name = (String)properties.get("name");
room.sendMessage(name + " - " + chatMessage.getMessage());
}
}
#OnClose
public void OnClose(Session session, CloseReason reason) {
room.leave(session);
room.sendMessage((String)session.getUserProperties().get("name") + " - Left the room");
}
#OnError
public void onError(Session session, Throwable ex) { log.info("Error: " + ex.getMessage()); }
}
Room.java
public class Room {
private static Room instance = null;
private List<Session> sessions = new ArrayList<Session>();
public synchronized void join(Session session) { sessions.add(session); }
public synchronized void leave(Session session) { sessions.remove(session); }
public synchronized void sendMessage(String message) {
for (Session session: sessions) {
if (session.isOpen()) {
try { session.getBasicRemote().sendText(message); }
catch (IOException e) { e.printStackTrace(); }
}
}
}
public synchronized static Room getRoom() {
if (instance == null) { instance = new Room(); }
return instance;
}
}
index.jsp
Here i am sending the wsUri which is stored in context param as ws://localhost:8080/single-room-chat/chat
<%# page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<% String WsUrl = getServletContext().getInitParameter("WsUrl"); %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name='viewport' content='minimum-scale=1.0, initial-scale=1.0,
width=device-width, maximum-scale=1.0, user-scalable=no'/>
<title>single-room-chat</title>
<link rel="stylesheet" type="text/css" href="content/styles/site.css">
<script type="text/javascript" src="scripts/chatroom.js"></script>
<script type="text/javascript">
var wsUri = '<%=WsUrl%>';
var proxy = CreateProxy(wsUri);
document.addEventListener("DOMContentLoaded", function(event) {
console.log(document.getElementById('loginPanel'));
proxy.initiate({
loginPanel: document.getElementById('loginPanel'),
msgPanel: document.getElementById('msgPanel'),
txtMsg: document.getElementById('txtMsg'),
txtLogin: document.getElementById('txtLogin'),
msgContainer: document.getElementById('msgContainer')
});
});
</script>
</head>
<body>
<div id="container">
<div id="loginPanel">
<div id="infoLabel">Type a name to join the room</div>
<div style="padding: 10px;">
<input id="txtLogin" type="text" class="loginInput"
onkeyup="proxy.login_keyup(event)" />
<button type="button" class="loginInput" onclick="proxy.login()">Login</button>
</div>
</div>
<div id="msgPanel" style="display: none">
<div id="msgContainer" style="overflow: auto;"></div>
<div id="msgController">
<textarea id="txtMsg"
title="Enter to send message"
onkeyup="proxy.sendMessage_keyup(event)"
style="height: 20px; width: 100%"></textarea>
<button style="height: 30px; width: 100px" type="button"
onclick="proxy.logout()">Logout</button>
</div>
</div>
</div>
</body>
</html>
chatroom.js
var CreateProxy = function(wsUri) {
var websocket = null;
var audio = null;
var elements = null;
var playSound = function() {
if (audio == null) {
audio = new Audio('content/sounds/beep.wav');
}
audio.play();
};
var showMsgPanel = function() {
elements.loginPanel.style.display = "none";
elements.msgPanel.style.display = "block";
elements.txtMsg.focus();
};
var hideMsgPanel = function() {
elements.loginPanel.style.display = "block";
elements.msgPanel.style.display = "none";
elements.txtLogin.focus();
};
var displayMessage = function(msg) {
if (elements.msgContainer.childNodes.length == 100) {
elements.msgContainer.removeChild(elements.msgContainer.childNodes[0]);
}
var div = document.createElement('div');
div.className = 'msgrow';
var textnode = document.createTextNode(msg);
div.appendChild(textnode);
elements.msgContainer.appendChild(div);
elements.msgContainer.scrollTop = elements.msgContainer.scrollHeight;
};
var clearMessage = function() {
elements.msgContainer.innerHTML = '';
};
return {
login: function() {
elements.txtLogin.focus();
var name = elements.txtLogin.value.trim();
if (name == '') { return; }
elements.txtLogin.value = '';
// Initiate the socket and set up the events
if (websocket == null) {
websocket = new WebSocket(wsUri);
websocket.onopen = function() {
var message = { messageType: 'LOGIN', message: name };
websocket.send(JSON.stringify(message));
};
websocket.onmessage = function(e) {
displayMessage(e.data);
showMsgPanel();
playSound();
};
websocket.onerror = function(e) {};
websocket.onclose = function(e) {
websocket = null;
clearMessage();
hideMsgPanel();
};
}
},
sendMessage: function() {
elements.txtMsg.focus();
if (websocket != null && websocket.readyState == 1) {
var input = elements.txtMsg.value.trim();
if (input == '') { return; }
elements.txtMsg.value = '';
var message = { messageType: 'MESSAGE', message: input };
// Send a message through the web-socket
websocket.send(JSON.stringify(message));
}
},
login_keyup: function(e) { if (e.keyCode == 13) { this.login(); } },
sendMessage_keyup: function(e) { if (e.keyCode == 13) { this.sendMessage(); } },
logout: function() {
if (websocket != null && websocket.readyState == 1) { websocket.close();}
},
initiate: function(e) {
elements = e;
elements.txtLogin.focus();
}
}
};
I'm designing a chatroom in ratchet websockets to be as responsive as possible.
It knows when a user leaves the page, and everything like that.
But if a user/client for example loses its connection with the server, the issue is the client cant let the server know it has disconnected, because it has already disconnected and cant send the server a message. So how do I track when a chat client has lost their internet connection and is no longer online?
Two possible solutions I can think of:
server polls the clients once every 15 mins to half hour to check to see who is online. Clients who do not respond get disconnected. Is this possible to do without interrupting everything else going on in php? if so how? and where do I put the code? I saw something about addPeriodicTimer() from LoopInterface but im not sure if that would do the job or where the function would fit into my code.
Also does it call sleep() function because that would not be good. I still want other tasks happening in the background while this function is on a timer (if possible in php)
onClose() method in php
Can this detect when a user has really disconnected in every circumstance? If so, when this event fires off, how can I find out which user was disconnected? it only passes a ConnectionInterface and no message.
Sorry, im still new to the ratchet library and still trying to work out how to achieve this task.
my code for server.php:
<?php
require($_SERVER['DOCUMENT_ROOT'].'/var/www/html/vendor/autoload.php');
use Ratchet\Server\IoServer;
use Ratchet\Http\HttpServer;
use Ratchet\WebSocket\WsServer;
$server = IoServer::factory(new HttpServer(new WsServer(new Chat)), 8080);
$server->run();
?>
code for app.js
// JavaScript Document
var chat = document.getElementById("chatwindow");
var msg = document.getElementById("messagebox");
var refInterval = 0;
var timeup = false;
var awaytimer;
var socket = new WebSocket("ws://52.39.48.172:8080");
var openn = false;
function addMessage(msg){
"use strict";
chat.innerHTML += "<p>" + msg + "</p>";
}
msg.addEventListener('keypress', function(evt){
"use strict";
if(evt.charCode != 13)
return;
evt.preventDefault();
if(msg.value == "" || !openn)
return;
socket.send(JSON.stringify({
msg: msg.value,
uname: nme,
uid: id,
tag: "[msgsend]"
}));
msg.value = "";
});
socket.onopen = function(evt) {
openn = true;
socket.send(JSON.stringify({
uname: nme,
uid: id,
tag: "[connected]"
}));
};
socket.onmessage = function(evt) {
var data = JSON.parse(evt.data);
if(data.tag == "[connected]")
{
addMessage(data.uname + " has connected...");
}
else if(data.tag == "[bye]")
{
addMessage(data.uname + " has left the room...");
if(data.uname == nme)
socket.close();
}
else if(data.tag == "[msgsend]")
{
addMessage(data.uname + ": " + data.msg);
}
};
window.onfocus = refPage;
function refPage()
{
if(timeup == true)
{
if(refInterval == 1)
{
refInterval = 0;
location.reload();
}
}
else
{
clearTimeout(awaytimer);
}
timeup = false;
}
window.onblur = timelyExit;
function timelyExit()
{
refInterval = 1;
// change this to trigger some kind of inactivity timer
awaytimer = setTimeout(function(){socket.send(JSON.stringify({
uname: nme,
uid: id,
tag: "[bye]"
})); timeup=true; }, 900000);
}
window.onoffline = window.onunload = window.onbeforeunload = confirmExit;
function confirmExit()
{
socket.send(JSON.stringify({
uname: nme,
uid: id,
tag: "[bye]"
}));
socket.close();
}
socket.onclose = function() {
openn = false;
//cant send server this message because already closed.
/*
socket.send(JSON.stringify({
uname: nme,
uid: id,
tag: "[bye]"
}));
*/
socket.close();
};
Code for chat.php
<?php
error_reporting(E_ALL ^ E_NOTICE);
session_id($_GET['sessid']);
if(!session_id)
session_start();
$userid = $_SESSION["userid"];
$username = $_SESSION["username"];
$isadmin = $_SESSION["isadmin"];
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
class Chat implements MessageComponentInterface
{
protected $clients;
public function __construct()
{
$this->clients = new \SplObjectStorage;
}
public function onOpen(ConnectionInterface $conn)
{
$this->clients->attach($conn);
}
public function onClose(ConnectionInterface $conn)
{
$this->clients->detach($conn);
}
public function onMessage(ConnectionInterface $conn, $msg)
{
$msgjson = json_decode($msg);
$tag = $msgjson->tag;
if($tag == "[msgsend]")
{
foreach($this->clients as $client)
{
$client->send($msg);
}
}
else if($tag == "[bye]")
{
foreach($this->clients as $client)
{
$client->send($msg);
}
onClose($conn);
}
else if($tag == "[connected]")
{
//store client information
//send out messages
foreach($this->clients as $client)
{
$client->send($msg);
}
}
}
public function onError(ConnectionInterface $conn, Exception $e)
{
echo "Error: " . $e->getMessage();
$conn -> close();
}
}
?>
Edit: just tested and confirmed onClose() method doesnt fire when internet connection is terminated.
is there a way i can still go about the first solution?
This best solution for detecting disconnected clients would be event based and does not poll the clients at all. This approach would be your second solution, and also models itself nicely around the asynchronous nature of WebSocket message passing.
It is however possible as you state that some naughty clients in certain cases may not notify the socket server of their disconnection and leave it 'hanging', so to speak. In this case, I would suggest to not try to implement the polling trigger within the Socket Server itself and instead initiate the polling via a separate, server-side client that is triggered via cron or other task scheduler and instructs the socket server to initiate a request to poll all connected clients.
For more information on constructing server-side clients, see this question of mine for which I was also able to find some solutions.
In order to determine who sent the disconnect message, I would suggest going away from using just SplObjectStorage inside of the Ratchet\MessageComponentInterface implementation you have and instead wrap a simple array inside of another class, so something like this:
class MyClientList
{
protected $clients = [];
public function addClient(Connection $conn)
{
$this->clients[$conn->resourceId] = [
'connection' => $conn,
];
return $this;
}
public function removeClient(Connection $conn)
{
if(isset($this->clients[$conn->resourceId])) {
unset($this->clients[$conn->resourceId]);
}
return $this;
}
public function registerClient(ConnectionInterface $conn, array $userData)
{
if(isset($this->clients[$conn->resourceId])) {
$this->clients[$conn->resourceId] = array_merge(
$this->clients[$conn->resourceId],
$userData
);
}
return $this;
}
public function getClientData(ConnectionInterface $conn)
{
return isset($this->clients[$conn->resourceId]) ?
$this->clients[$conn->resourceId] :
null
;
}
}
At some point shortly after a user first connects, your client should send a socket message to the server and instruct the server to now register the identity of the client with additional information (in your case you are attempting to identify a uname and uid properties). By indexing against the connection id, you should be able to use this implementation to divine the identity of all messages originating from clients after they have sent in the initial registration message.
Following scenario/my solution consists of the following:
Project one: (SELF HOST) I have a SignalR console application which handles the logic including the authentication process ( queries database with EF ). Project two: (CLIENT) I have an ASP.Net web application with an AngularJS client.
So far I can talk to the hub just fine. The problem is, I cannot seem to get the authentication to work. I've tried a bunch of things I've found but none of them worked. Most of them didn't even apply to my problem..
Currently I've stripped my project back to the basics and I have the following code:
Startup class:
public class Startup
{
public void Configuration(IAppBuilder app)
{
app.UseCors(CorsOptions.AllowAll);
app.MapSignalR();
}
}
My hub:
[HubName("systemHub")]
public class systemHub : Hub
{
public void Authenticate(String pLogin, String pPassword)
{
User curUser = new AuthManager().Authenticate(pLogin, pPassword);
//this is where I'd want to send the auth cookie or whatever and contact the "loginCallback" function in my client
}
[Authorize]
public void Hello(String pMessage)
{
Clients.All.callbackFunc(pMessage);
}
}
Js client:
hinagApp.controller('hinagController', function ($scope) {
$(document).ready(function () {
var conURL = 'http://localhost:8080/signalr';
$.getScript(conURL + '/hubs', function () {
$.connection.hub.url = conURL;
var lHub = $.connection.systemHub;
lHub.client.callbackFunc = function(pM){
alert(pM);
}
lHub.client.loginCallback = function (pSuccess) {
if (pSuccess) {
//if logged in
lHub.server.hello("test");
}
else {
alert("fail");
}
}
$('#loginbutton').click(function () {
lHub.server.authenticate($('#input_login').val(), $('#input_pass').val());
});
$.connection.hub.start();
});
})
});
I recently ran into a similar problem. If I understand you right, you want to do the authentication on your signalr server application. Signalr can accept standard webrequests just fine.
Set the authenticationtype to cookies:
CookieAuthenticationOptions lOptions = new CookieAuthenticationOptions()
{
AuthenticationType = CookieAuthenticationDefaults.AuthenticationType,
LoginPath = new PathString("/Auth/Login"),
LogoutPath = new PathString("/Auth/Logout"),
};
app.UseCookieAuthentication(lOptions);
If user wants to login, set the claims you'd like to use
var lForm = await context.Request.ReadFormAsync();
if (!String.IsNullOrEmpty(lForm["input_login"]) && !String.IsNullOrEmpty(lForm["input_pass"]))
{
//Benutzer authentifizieren
var lAuthenticatedUser = new UserManager().Authenticate(lForm["input_login"], lForm["input_pass"]);
if (lAuthenticatedUser != null)
{
//Existiert der Nutzer legen wir die Claims an
ClaimsIdentity lIdentity = new ClaimsIdentity(lOptions.AuthenticationType);
lIdentity.AddClaim(new Claim(ClaimTypes.Name, lAuthenticatedUser.Username));
lIdentity.AddClaim(new Claim(ClaimTypes.NameIdentifier, lAuthenticatedUser.InternalUserId.ToString()));
lIdentity.AddClaim(new Claim(ClaimTypes.SerialNumber, context.Request.RemoteIpAddress));
//Und zum Schluss einloggen
context.Authentication.SignIn(lIdentity);
//Und auf die Spieleseite weiterleiten
context.Response.Redirect(BLL._Configuration.HinagGameURL);
}
}
If you want to serve the login page you can do it like this (_Authpage is your page as String, for example)
else if (context.Request.Path.Value == "/Auth/")
{
if (context.Authentication.User != null)
context.Response.Redirect(BLL._Configuration.HinagGameURL);
context.Response.ContentType = "text/html";
await context.Response.WriteAsync(_Authpage);
}
If the user needs anything else ( such as additional style files in your authpage )
else
{
await next();
}
All of this belongs in your Startup.
In Startup.cs you need to add forms authentication middleware (probably you need to tune it a bit):
app.UseCookieAuthentication(new CookieAuthenticationOptions
{
AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie
});
https://msdn.microsoft.com/en-us/library/microsoft.owin.security.cookies.cookieauthenticationoptions(v=vs.113).aspx
You kind screwed up Angular with that code. Try this one:
hinagApp
.controller('hinagController', function ($scope, $http) {
var conURL = 'http://localhost:8080/signalr';
var lHub = $.connection.systemHub;
lHub.client.callbackFunc = function(pM){
alert(pM);
}
lHub.client.loginCallback = function (pSuccess) {
if (pSuccess) {
//if logged in
lHub.server.hello("test");
}
else {
alert("fail");
}
}
$http
.get(conURL + '/hubs')
.then(function(response) {
$.connection.hub.url = conURL;
$('#loginbutton').click(function () {
lHub.server.authenticate($('#input_login').val(), $('#input_pass').val());
});
$.connection.hub.start();
});
});
I am writing to seek help, in regards creating a real-time data update using SignalR. I am currently having issue on the client-side, where I am unable to render the data content.
I have a tested the query command and it seems to be returning data. This leads me to believe, that my client-side code, maybe incorrect.
<script src="~/Scripts/jquery-1.8.2.min.js" type="text/javascript" ></script>
<script src="~/Scripts/jquery.signalR-2.0.1.min.js" type="text/javascript" ></script>
<script src="~/signalr/hubs" type="text/javascript" ></script>
<script type="text/javascript">
$(function () {
// Declare a proxy to reference the hub.
var notifications = $.connection.NotificationHub;
// Create a function that the hub can call to broadcast messages.
notifications.client.recieveNotification = function (role, descrip) {
// Add the message to the page.
$('#spanNewMessages').text(role);
$('#spanNewCircles').text(descrip);
};
// Start the connection.
$.connection.hub.start().done(function () {
notifications.server.sendNotifications(function () {
alert("does it work");
});
}).fail(function (e) {
alert(e);
});
</script>
<h1>New Notifications</h1>
<div>
<b>New <span id="spanNewMessages"></span> role.</b><br />
<b>New<span id="spanNewCircles"></span> descrip.</b><br />
</div>
Hub Class:
[HubName("NotificationHub")]
public class notificationHub : Hub
{
string role = "";
string descrip = "";
[HubMethodName("sendNotifications")]
public void SendNotifications()
{
using (var connection = new SqlConnection(ConfigurationManager.ConnectionStrings["dummyConnectionString"].ConnectionString))
{
string query = "SELECT [role],[description] FROM [dbo].[User]";
connection.Open();
using (SqlCommand command = new SqlCommand(query, connection))
{
command.Notification = null;
DataTable dt = new DataTable();
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
if (connection.State == ConnectionState.Closed)
connection.Open();
var reader = command.ExecuteReader();
dt.Load(reader);
if (dt.Rows.Count > 0)
{
role = dt.Rows[0]["role"].ToString();
descrip = dt.Rows[0]["description"].ToString();
}
}
}
Clients.All.RecieveNotification(role, descrip);
}
private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
{
if (e.Type == SqlNotificationType.Change)
{
notificationHub nHub = new notificationHub();
nHub.SendNotifications();
}
}
}
StartUp CLass:
using Microsoft.Owin;
using Owin;
using WebApplication2;
namespace WebApplication2
{
public class Startup
{
public void Configuration(IAppBuilder app)
{
app.MapSignalR();
}
}
}
Could anyone, please provide some assistant, to where I may be going wrong with this task. Thank you.
I mocked up your app. Your issue was you are returning a string from your hub action:
public string SendNotifications()
{
return context.Clients.All.RecieveNotification(role, descrip);
}
this should be void (you aren't returning anything, but actually calling the clients), and you also don't need to use GlobalHost to get the context here, only when the context isn't available (I.E. calling the hub from the server). Try making these changes:
[HubMethodName("sendNotifications")]
public void SendNotifications()
{
//using...
//IHubContext context = GlobalHost.ConnectionManager.GetHubContext<notificationHub>();
//return context.Clients.All.RecieveNotification(role, descrip);
Clients.All.RecieveNotification(role, descrip);
}
Put a breakpoint at Clients.All... and see if it is being triggered. Let me know if these updates fix your issue.
I am running the following script on the client-side and the script is failing to update, when there is change in the database. I debugged the script using DevTools and discovered my Jquery scripts are responding back as "304 not modified". Does this issue, indicate why the client-side content is failing to update.
<script src="../Scripts/jquery-1.6.4.js"></script>
<script src="../Scripts/jquery-1.6.4.min.js"></script>
<script src="../Scripts/jquery.signalR-2.1.2.min.js"></script>
<script src='<%: ResolveClientUrl("~/signalr/hubs") %>'></script>
<script type="text/javascript">
$(function () {
// Declare a proxy to reference the hub.
var notifications = $.connection.NotificationHub;
// Create a function that the hub can call to broadcast messages.
notifications.client.recieveNotification = function (role, descrip) {
// Add the message to the page.
$('#spanNewMessages').text(role);
$('#spanNewCircles').text(descrip);
};
// Start the connection.
$.connection.hub.start().done(function () {
notifications.server.sendNotifications();
alert("Notifications have been sent.");
}).fail(function (e) {
alert(e);
});
//$.connection.hub.start();
});
</script>
<h1>New Notifications</h1>
<div>
<br />
<b>New <span id="spanNewMessages"></span> = role.</b><br />
<b>New <span id="spanNewCircles"></span> = descrip.</b><br />
</div>
Hub Class:
[HubName("NotificationHub")]
public class notificationHub : Hub
{
string role = "";
string descrip = "";
[HubMethodName("sendNotifications")]
public void SendNotifications()
{
using (var connection = new SqlConnection(ConfigurationManager.ConnectionStrings["dummyConnectionString"].ConnectionString))
{
string query = "SELECT top 1 [role],[description] FROM [dbo].[User] order by uploadDate desc";
connection.Open();
SqlDependency.Start(GetConnectionString());
using (SqlCommand command = new SqlCommand(query, connection))
{
try
{
command.Notification = null;
DataTable dt = new DataTable();
SqlDependency dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
if (connection.State == ConnectionState.Closed)
connection.Open();
var reader = command.ExecuteReader();
dt.Load(reader);
if (dt.Rows.Count > 0)
{
role = dt.Rows[0]["role"].ToString();
descrip = dt.Rows[0]["description"].ToString();
}
connection.Close();
}
catch (Exception ex)
{
throw ex;
}
}
}
Clients.All.RecieveNotification(role, descrip);
}
[HubMethodName("onStatusChanged")]
private void dependency_OnChange(object sender, SqlNotificationEventArgs e)
{
if (e.Info == SqlNotificationInfo.Insert)
{
notificationHub nHub = new notificationHub();
nHub.SendNotifications();
}
}
Please advice. Thank you.