public void WriteAnnotation(DateTime timestamp, string title, string message, params string[] tags)
{
using (var fileStream = File.Open(path, FileMode.Open, FileAccess.Write, FileShare.Read))
using (var binaryWriter = new Util.BinaryWriter(fileStream, Encoding.UTF8, true))
{
fileStream.Seek(0, SeekOrigin.End);
var ts = ConvertToTimestamp(timestamp.ToUniversalTime());
binaryWriter.Write(ts);
var buffer = Encoding.UTF8.GetBytes(title);
binaryWriter.Write(buffer.Length);
binaryWriter.Write(buffer);
buffer = Encoding.UTF8.GetBytes(message);
binaryWriter.Write(buffer.Length);
binaryWriter.Write(buffer);
var tagCount = tags == null ? 0 : tags.Length;
binaryWriter.Write(tagCount);
if (tags != null)
{
foreach (var tag in tags)
{
buffer = Encoding.UTF8.GetBytes(tag);
binaryWriter.Write(buffer.Length);
binaryWriter.Write(buffer);
} // foreach
}
binaryWriter.Flush();
}// using
}
public void WriteDatapoints(IList <Datapoint> datapoints)
{
Timestamp now = currentTimeProvider();
var archiveIndex = 0;
var archive = archives[archiveIndex];
var currentPoints = new List <Datapoint>();
using (var fileStream = File.Open(path, FileMode.Open, FileAccess.ReadWrite, FileShare.Read))
using (var binaryWriter = new Util.BinaryWriter(fileStream, Encoding.UTF8, true))
using (var binaryReader = new Util.BinaryReader(fileStream, Encoding.UTF8, true))
{
foreach (var point in datapoints.OrderByDescending(d => d.Timestamp))
{
var age = TimeSpan.FromSeconds(now - (Timestamp)point.Timestamp);
while (archive.Retention.History < age)
{
if (currentPoints.Count > 0)
{
WriteDatapoints(binaryReader, binaryWriter, archive, Enumerable.Reverse(currentPoints).ToList());
currentPoints.Clear();
} // if
if (archiveIndex == archives.Count - 1)
{
break;
}
archive = archives[++archiveIndex];
} // while
if (archive == null)
{
break;
}
currentPoints.Add(point);
} // foreach
if (archive != null && currentPoints.Count > 0)
{
WriteDatapoints(binaryReader, binaryWriter, archive, Enumerable.Reverse(currentPoints).ToList());
}
fileStream.Flush(true);
}// using
}
public void WriteDatapoint(DateTime dateTime, double value)
{
Timestamp timestamp = dateTime.ToUniversalTime();
Timestamp now = currentTimeProvider();
var diff = now - timestamp;
if (diff < 0)
{
throw new Exception(); // TODO
}
if (diff >= maxRetention)
{
throw new Exception(); // TODO
}
var archive = archives.FirstOrDefault(a => a.Retention.History >= diff);
if (archive == null)
{
throw new Exception(); // TODO: Exception
}
var lowerArchives = archives.Skip(archives.IndexOf(archive) + 1);
timestamp = timestamp.RoundDownModulo(archive.Retention.Precision);
using (var fileStream = File.Open(path, FileMode.Open, FileAccess.ReadWrite, FileShare.Read))
using (var binaryWriter = new Util.BinaryWriter(fileStream, Encoding.UTF8, true))
using (var binaryReader = new Util.BinaryReader(fileStream, Encoding.UTF8, true))
{
WriteDatapoint(binaryReader, binaryWriter, archive, timestamp, value);
var higher = archive;
foreach (var lower in lowerArchives)
{
if (!Downsample(binaryReader, binaryWriter, timestamp, higher, lower))
{
break;
}
higher = lower;
} // foreach
fileStream.Flush(true);
}// using
}
