public void AddCapture(IImage image, CaptureSource source, GateState state = GateState.Open, DateTime?timestamp = null)
{
if (!IsEnabled)
{
return;
}
var dateTime = timestamp ?? DateTime.UtcNow;
DateTime lastTimestamp;
if (_lastTimestamps.TryGetValue(source, out lastTimestamp) && (dateTime - lastTimestamp).TotalMilliseconds < minCaptureInterval)
{
return;
}
var capture = new CaptureEntry()
{
Timestamp = dateTime,
GateState = state,
Source = source,
FilePath = SaveImage(image, source.ToString()),
};
var command = _db.CreateCommand();
command.CommandText =
string.Format(
"INSERT INTO CaptureEntries (Timestamp, GateState, Source, FilePath) VALUES ('{0}Z', {1}, {2}, '{3}')",
capture.Timestamp.ToString("yyyy-MM-dd HH:mm:ss.fffffff"), (int)capture.GateState, (int)capture.Source, capture.FilePath);
try
{
lock (_dbLock)
{
command.ExecuteNonQuery();
}
_lastTimestamps[source] = dateTime;
}
catch (Exception e)
{
TryDeleteImage(capture.FilePath);
throw new CaptureStorageException("Failed to add a capture to DB", e);
}
finally
{
command.Dispose();
}
}
public CaptureEntry[] GetCaptures(DateTime time, int msMargin)
{
var from = time.ToUniversalTime();
var to = from.AddMilliseconds(msMargin);
List <CaptureEntry> captures = new List <CaptureEntry>();
var command = _db.CreateCommand();
command.CommandText =
string.Format(
"SELECT Id, Timestamp, GateState, Source, FilePath FROM CaptureEntries WHERE Timestamp >= '{0}Z' AND Timestamp < '{1}Z'",
from.ToString("yyyy-MM-dd HH:mm:ss.fffffff"), to.ToString("yyyy-MM-dd HH:mm:ss.fffffff"));
try
{
lock (_dbLock)
{
using (var reader = command.ExecuteReader())
{
while (reader.Read())
{
var capture = new CaptureEntry()
{
Id = reader.GetInt64(0),
Timestamp = reader.GetDateTime(1),
GateState = (GateState)reader.GetInt32(2),
Source = (CaptureSource)reader.GetInt32(3),
FilePath = reader.GetString(4)
};
captures.Add(capture);
}
}
}
}
catch (Exception e)
{
throw new CaptureStorageException("Failed to retrive captures from DB", e);
}
finally
{
command.Dispose();
}
return(captures.GroupBy(x => x.Source, (source, entries) => entries.FirstOrDefault()).ToArray());
}