/// <summary>
/// Write this sensor out to a configuration file
/// </summary>
/// <param name="r"></param>
/// <returns></returns>
public void Serialize(string filename)
{
try {
var settings = new JsonSerializerSettings();
settings.TypeNameHandling = TypeNameHandling.Objects;
settings.Formatting = Newtonsoft.Json.Formatting.Indented;
var s = JsonConvert.SerializeObject(SensorProject.Current, settings);
File.WriteAllText(filename, s);
} catch (Exception ex) {
SensorProject.LogException("Error saving sensor project", ex);
}
}
/// <summary>
/// Collect data for this sensor (with parameter - not used!)
/// </summary>
public async Task OuterCollect()
{
DateTime collectStartTime = DateTime.MinValue;
DateTime collectFinishTime = DateTime.MinValue;
bool success = false;
TimeSpan ts = new TimeSpan();
SensorData sd = null;
SensorCollectEventArgs args = new SensorCollectEventArgs();
// Collect data and clock how long it took
try {
collectStartTime = DateTime.UtcNow;
args.Raw = await Collect();
collectFinishTime = DateTime.UtcNow;
ts = collectFinishTime - collectStartTime;
// Record what was collected
LastCollectTime = collectFinishTime;
sd = AddValue(args.Raw.Value, collectStartTime, (int)ts.TotalMilliseconds);
success = true;
// If something blew up, keep track of it
} catch (Exception ex) {
args.Exception = new SensorException()
{
Cleared = false,
Description = ex.Message,
ExceptionTime = DateTime.UtcNow,
StackTrace = ex.StackTrace
};
LastException = ex.ToString();
InError = true;
if (PauseOnError)
{
Enabled = false;
SensorProject.LogException("Sensor error & pause: (#" + this.Identity + ") " + this.Name, ex);
}
else
{
SensorProject.LogException("Sensor error: (#" + this.Identity + ") " + this.Name, ex);
}
// Release the inflight status so that this sensor can collect again
} finally {
// Move forward to next collection time period - skip any number of intermediate time periods
if (NextCollectTime < DateTime.UtcNow)
{
NextCollectTime = DateTime.UtcNow.AddSeconds((int)Frequency);
}
// Allow this to be recollected again
InFlight = false;
}
// Now, all elements that can safely be moved after the inflight flag is turned off
if (success)
{
args.Data = new Common.SensorData()
{
CollectionTimeMs = (int)ts.TotalMilliseconds,
Time = collectFinishTime,
Value = args.Raw.Value
};
// Is anyone listening?
if (this.SensorCollect != null)
{
SensorCollect(this, args);
}
}
// Notify everyone of what happened
if (Children != null)
{
foreach (ICondition c in Children)
{
c.TestCondition(args);
}
}
}
/// <summary>
/// Read a sensor back from a node from an XML file
/// </summary>
/// <param name="r"></param>
/// <returns></returns>
public static SensorProject Deserialize(string filename)
{
SensorProject sp = null;
// Read in the text
try {
var settings = new JsonSerializerSettings();
settings.TypeNameHandling = TypeNameHandling.Objects;
settings.Formatting = Newtonsoft.Json.Formatting.Indented;
string s = File.ReadAllText(filename);
sp = JsonConvert.DeserializeObject <SensorProject>(s, settings);
// Failed to load
} catch (Exception ex) {
SensorProject.LogException("Error loading sensor file", ex);
sp = new SensorProject();
}
// Now make all the sensors read their data
Current = sp;
List <int> sensor_id_list = new List <int>();
foreach (IDevice dc in sp.Children)
{
dc.Parent = SensorProject.Current;
// Go through all sensors for this device
foreach (ISensor bs in dc.Children)
{
// Make sure each sensor is uniquely identified! If any have duplicate IDs, uniqueify them
if (sensor_id_list.Contains(bs.Identity))
{
bs.Identity = sp.NextSensorNum++;
}
sensor_id_list.Add(bs.Identity);
bs.Parent = (IDevice)dc;
// Read in each sensor's data, and write it back out to disk
// (this ensures that all files have the same fields in the same order - permits appending via AppendText later
bs.DataRead();
// Loop through all conditions / actions
foreach (ICondition c in bs.Children)
{
c.Parent = bs;
foreach (IAction a in c.Children)
{
a.Parent = c;
}
}
}
}
// Ensure that the log folder exists
if (!Directory.Exists("logs"))
{
Directory.CreateDirectory("Logs");
}
// Save this as the current project
return(sp);
}
/// <summary>
/// This is the background thread for collecting data
/// </summary>
public async void CollectionThread()
{
// Okay, let's enter the loop
while (_keep_running)
{
int collect_count = 0;
DateTime next_collect_time = DateTime.MaxValue;
// Be safe about this - we don't want this thread to blow up! It's the only one we've got
try {
// Loop through sensors, and spawn a work item for them
for (int i = 0; i < Children.Count; i++)
{
IDevice dc = Children[i] as IDevice;
for (int j = 0; j < dc.Children.Count; j++)
{
// Allow us to kick out
if (!_keep_running)
{
return;
}
// Okay, let's work on this sensor
ISensor s = dc.Children[j] as ISensor;
if ((s.Enabled) && (!s.InFlight) && (s.Frequency != Interval.Never))
{
// Spawn a work item in the thread pool to do this collection task
if (s.NextCollectTime <= DateTime.UtcNow)
{
s.InFlight = true;
Task.Run(() => s.OuterCollect());
collect_count++;
// If it's not time yet, use this to factor when next to wake up
}
else
{
if (s.NextCollectTime < next_collect_time)
{
next_collect_time = s.NextCollectTime;
}
}
}
}
}
// Failsafe
} catch (Exception ex) {
SensorProject.LogException("Collect", ex);
}
// Sleep until next collection time, but allow ourselves to kick out
if (!_keep_running)
{
return;
}
TimeSpan time_to_sleep = next_collect_time - DateTime.UtcNow;
int clean_sleep_time = Math.Max(1, Math.Min((int)time_to_sleep.TotalMilliseconds, 1000));
await Task.Delay(clean_sleep_time);
}
}
