/// <summary>
/// This method is used to
/// keep the context alive.
/// </summary>
/// <param name="ct"></param>
/// <param name="nowUtc"></param>
public void KeepContextAliveIfNeeded(CancellationToken ct, DateTime nowUtc)
{
if (!_serverContextIsOperational)
{
return;
}
uint timeDiffInMs = (uint)(nowUtc - _resourceManagementLastCallUtc).TotalMilliseconds + 500;
if (timeDiffInMs >= KeepAliveIntervalMs)
{
try
{
_resourceManagementClient.ClientKeepAlive(new ClientKeepAliveRequest
{
ContextId = _serverContextId
}, cancellationToken: ct);
_resourceManagementLastCallUtc = nowUtc;
}
catch
{
_serverContextIsOperational = false;
_pendingContextNotificationData = new ClientContextNotificationData(ClientContextNotificationType.ClientKeepAliveException, null);
}
}
}
private void ClientContextOnContextNotifyEvent(object sender, ClientContextNotificationData notificationData)
{
if (_disposed)
{
return;
}
switch (notificationData.ReasonForNotification)
{
case ClientContextNotificationType.ResourceManagementFail:
case ClientContextNotificationType.ClientKeepAliveException:
case ClientContextNotificationType.Shutdown:
case ClientContextNotificationType.ServerKeepAliveError:
case ClientContextNotificationType.GeneralException:
case ClientContextNotificationType.PollException:
case ClientContextNotificationType.ResourceManagementDisconnected:
CloseConnectionInternal();
break;
}
}
/// <summary>
/// <para> Re throws. </para>
/// <para>
/// This method processes an exception thrown when the client application calls one of the methods on the
/// IResourceManagment interface.
/// </para>
/// <para>
/// If the exception is a FaultException, the exception is from the server and is rethrown unless the exception
/// indicates that the server has shutdown. In this case the Abort callback is called to notify the client of the
/// shutdown.
/// </para>
/// <para>
/// If the exception is a CommunicationException, then the ThrowOnDisconnectedEndpoint() method is called on the
/// ResourceManagment endpoint to throw the exception back to the calling client application to notify it of the
/// failed endpoint.
/// </para>
/// <para> For all other exceptions, the exception is rethrown. </para>
/// </summary>
/// <param name="ex"> The exception that was thrown. </param>
private void ProcessRemoteMethodCallException(Exception ex)
{
if (ex is RpcException)
{
if (!_serverContextIsOperational)
{
return;
}
_serverContextIsOperational = false;
// if not a server shutdown, then throw the error message from the server
//if (IsServerShutdownOrNoContextServerFault(ex as FaultException<DataGrpcFault>)) return;
_pendingContextNotificationData = new ClientContextNotificationData(ClientContextNotificationType.ResourceManagementFail,
ex);
_logger.LogDebug(ex, "RpcException when server method call. Client reconnecting..");
}
_logger.LogDebug(ex, "Exception when server method call.");
}
