/// <summary>
/// Retrieves a set of device configs from the repository and creates devices with this information
/// Once the devices are built, they are started
/// </summary>
/// <param name="token"></param>
public async Task ProcessDevicesAsync(CancellationToken token)
{
var dm = new DeviceManager(_logger, token);
try
{
_logger.LogInfo("********** Starting Simulator **********");
while (!token.IsCancellationRequested)
{
var newDevices = new List<InitialDeviceConfig>();
var removedDevices = new List<string>();
var devices = await _deviceStorage.GetDeviceListAsync();
if (devices != null && devices.Any())
{
newDevices = devices.Where(d => !_deviceList.Any(x => x.DeviceId == d.DeviceId)).ToList();
removedDevices =
_deviceList.Where(d => !devices.Any(x => x.DeviceId == d.DeviceId))
.Select(x => x.DeviceId)
.ToList();
}
else if(_deviceList != null && _deviceList.Any())
{
removedDevices = _deviceList.Select(x => x.DeviceId).ToList();
}
if (newDevices.Count > 0)
{
_logger.LogInfo("********** {0} NEW DEVICES FOUND ********** ", newDevices.Count);
}
if (removedDevices.Count > 0)
{
_logger.LogInfo("********** {0} DEVICES REMOVED ********** ", removedDevices.Count);
}
//reset the base list of devices for comparison the next
//time we retrieve the device list
_deviceList = devices;
if (removedDevices.Any())
{
//stop processing any devices that have been removed
dm.StopDevices(removedDevices);
}
//begin processing any new devices that were retrieved
if (newDevices.Any())
{
var devicesToProcess = new List<IDevice>();
foreach (var deviceConfig in newDevices)
{
_logger.LogInfo("********** SETTING UP NEW DEVICE : {0} ********** ", deviceConfig.DeviceId);
devicesToProcess.Add(_deviceFactory.CreateDevice(_logger, _transportFactory, _telemetryFactory, _configProvider, deviceConfig));
}
#pragma warning disable 4014
//don't wait for this to finish
dm.StartDevicesAsync(devicesToProcess);
#pragma warning restore 4014
}
await Task.Delay(TimeSpan.FromSeconds(_devicePollIntervalSeconds), token);
}
}
catch (TaskCanceledException)
{
//do nothing if task was cancelled
_logger.LogInfo("********** Primary worker role cancellation token source has been cancelled. **********");
}
finally
{
//ensure that all devices have been stopped
dm.StopAllDevices();
}
}
