/// <summary>
/// Global watchdog worker.
/// Acts as a heartbeat for any pending <see cref="InFlightRequest"/> in the locale queue,
/// which waits the response within a certain timeout.
/// </summary>
private void WatchdogWorker()
{
while (this._watchdogCts.IsCancellationRequested == false)
{
if (Helpers.CancelableDelay(WatchdogClockInterval, this._watchdogCts.Token))
{
//delay wa scanceled
break;
}
lock (this._reqlocker)
{
foreach (var pair in this._requestRegister)
{
InFlightRequest request = pair.Value;
if (request.WatchdogClock(WatchdogClockInterval))
{
request.Reject(
new NATSTimeoutException("Timeout occurred while waiting for the reply.")
);
}
}
}
}
}
/// <summary>
/// Removes the <see cref="InFlightRequest"/> from the local queue.
/// </summary>
/// <param name="request"></param>
internal void DropRequest(InFlightRequest request)
{
lock (this._reqlocker)
{
this._requestRegister.Remove(request.ReqId);
}
}
/// <summary>
/// Common entry-point for all the "request" public synchronous methods
/// </summary>
/// <param name="message"></param>
/// <param name="timeout"></param>
/// <param name="token"></param>
/// <returns></returns>
private MsgOut RequestCore(
MsgIn message,
TimeSpan timeout,
CancellationToken token
)
{
InFlightRequest request = null;
try
{
request = this._rrmgr.SetupRequest(message);
this.PublishCore(message, timeout, token);
}
catch (Exception ex)
{
if (request != null)
{
this._rrmgr.DropRequest(request);
request.Dispose();
}
throw ex;
}
return(request.GetReply(timeout, token));
}
/// <summary>
/// Sets an <see cref="InFlightRequest"/> instance up,
/// as proxy for a request-reply process.
/// </summary>
/// <param name="message"></param>
/// <returns></returns>
internal InFlightRequest SetupRequest(MsgIn message)
{
InFlightRequest request;
lock (this._reqlocker)
{
request = new InFlightRequest(this, ++this._reqId);
this._requestRegister.Add(request.ReqId, request);
}
message.InboxRequest = request;
return(request);
}
