When doing multiple simultaneous Ajax calls cause my MVC web application to block. I have been reading and I found two topics with the same problem
Asynchronous Controller is blocking requests in ASP.NET MVC through jQuery
The solution for them is disabling the session using ControllerSessionStateAttribute .I have try using the attribute but my code is still blocking. You can reproduce the problem creating a new MVC3 web application with the following code
@{
ViewBag.Title = "Home Page";
}
<h2>@ViewBag.Message</h2>
<p>
Example of error when calling multiple AJAX, try click quickly on both buttons until the server get blocked.
</p>
<button onclick="cuelga++;SetCallWaiting(cuelga);">Set a call waiting in the server</button><button onclick="libera++;ReleaseEveryone(libera);">Release all calls in the server</button>
<div id="text"></div>
<script type="text/javascript">
var cuelga = 0;
var libera =0;
function ReleaseEveryone(number) {
var url = "/Home/ReleaseEveryone/";
$.post(url, { "id": number },
ShowResult1, "json");
};
function SetCallWaiting(number) {
var url = "/Home/SetACallWaiting/";
$.post(url, { "id": number },
ShowResult, "json");
};
function ShowResult (data) {
$("#text").append(' [The call waiting number ' + data[0] + ' come back ] ');
/* When we come back we also add a new extra call waiting with number 1000 to make it diferent */
SetCallWaiting(1000);
};
function ShowResult1(data) {
$("#text").append(' [The release call number ' + data[0] + ' come back ] ');
};
</script>
and this is the HomeController
using System;
using System.Collections.Generic;
using System.Web.Mvc;
using System.Threading;
using System.Web.SessionState;
namespace ErrorExample.Controllers
{
[SessionState(SessionStateBehavior.Disabled)]
public class HomeController : Controller
{
private static List<EventWaitHandle> m_pool = new List<EventWaitHandle>();
private static object myLock = new object();
public ActionResult Index()
{
ViewBag.Message = "Welcome to ASP.NET MVC!";
return View();
}
public ActionResult About()
{
return View();
}
[HttpPost]
public JsonResult SetACallWaiting()
{
EventWaitHandle myeve;
lock (myLock)
{
myeve = new EventWaitHandle(false, EventResetMode.ManualReset);
m_pool.Add(myeve);
}
myeve.WaitOne();
var topic = HttpContext.Request.Form[0];
return Json(new object[] { topic });
}
[HttpPost]
public JsonResult ReleaseEveryone()
{
try
{
lock (myLock)
{
foreach (var eventWaitHandle in m_pool)
{
eventWaitHandle.Set();
}
m_pool.Clear();
}
var topic = HttpContext.Request.Form[0];
return Json(new object[] { topic });
}
catch ( Exception )
{
return Json( new object[] { "Error" } );
}
}
}
}
Thank you very much in advance.
