public void ProcessRequest(HttpContext context)
{
// retrieve params
var clientId = context.Request.QueryString["clientId"];
var longPollingDuration = int.Parse(context.Request.QueryString["longPollingDuration"]);
var imgIdx = int.Parse(context.Request.QueryString["imgIdx"]); // if needed
// stream image(s) data within the response for the given duration
// the connection will be automatically reseted by the client when the request ends
var startTime = DateTime.Now;
var remainingTime = longPollingDuration;
var handler = new RemoteSessionLongPollingHandler(context, clientId);
try
{
handler.Open();
// keep the http context open as long as the http client is connected and for the given duration
while (context.Response.IsClientConnected && remainingTime > 0)
{
Thread.Sleep(1000);
remainingTime = longPollingDuration - Convert.ToInt32((DateTime.Now - startTime).TotalMilliseconds);
}
}
catch (Exception exc)
{
// rethrown
}
finally
{
handler.Close();
}
}
public void ProcessRequest(HttpContext context)
{
var handler = new RemoteSessionLongPollingHandler(context);
// retrieve params
var longPollingDuration = int.Parse(context.Request.QueryString["longPollingDuration"]);
var imgIdx = int.Parse(context.Request.QueryString["imgIdx"]); // if needed
// stream image(s) data within the response for the given duration
// the connection will be automatically reseted by the client when the request ends
var startTime = DateTime.Now;
var remainingTime = longPollingDuration;
try
{
// keep the http context open as long as the http client is connected and for the given duration
while (context.Response.IsClientConnected && remainingTime > 0)
{
Thread.Sleep(1000);
remainingTime = longPollingDuration - Convert.ToInt32((DateTime.Now - startTime).TotalMilliseconds);
}
}
catch (Exception exc)
{
Trace.TraceError("long polling error for http session {0} ({1})", context.Session.SessionID, exc);
}
Trace.TraceInformation("long polling closed for http session {0}", context.Session.SessionID);
}
public RemoteSessionLongPollingHandler(HttpContext context)
{
_context = context;
Session = context.Session;
try
{
if (_context.Session[HttpSessionStateVariables.RemoteSession.ToString()] == null)
{
throw new NullReferenceException();
}
// retrieve the remote session for the given http session
_remoteSession = (RemoteSession)_context.Session[HttpSessionStateVariables.RemoteSession.ToString()];
// register the handler against the remote session manager
lock (((ICollection)_remoteSession.Manager.LongPollings).SyncRoot)
{
// search for a previously registered handler
RemoteSessionLongPollingHandler oldLongPolling = null;
foreach (var longPolling in _remoteSession.Manager.LongPollings)
{
if (longPolling.Session.SessionID == _context.Session.SessionID)
{
oldLongPolling = longPolling;
break;
}
}
// unregister the previous handler, if any
if (oldLongPolling != null)
{
_remoteSession.Manager.LongPollings.Remove(oldLongPolling);
}
// register this handler
_remoteSession.Manager.LongPollings.Add(this);
}
// the handler is ready to push data
Send("<script>parent.lpInitConnection();</script>");
}
catch (Exception exc)
{
Trace.TraceError("Failed to retrieve the remote session for the http session {0}, ({1})", _context.Session.SessionID, exc);
}
}