/// <summary>
/// Serializes counter (metric) data to the stream.
/// </summary>
/// <param name="stream">Stream to which data should be serialized. Stream should be writable and provide random access.</param>
/// <param name="metricData">Collection of metric data to be serialized.</param>
public void Serialize(Stream stream, IEnumerable <IReadOnlyMetric> metricData)
{
if (!stream.CanWrite || !stream.CanSeek)
{
throw new ArgumentException("Stream should be writable and provide random access.", nameof(stream));
}
try
{
using (var writer = new NoCloseBinaryWriter(stream, Encoding.UTF8))
{
var startStreamPosition = stream.Position;
// Write version and type serializers info
writer.Write(this.version);
long crcOffSet = 0;
long crcBodyOffSet = 0;
if (this.version >= 5)
{
// Add CRC
crcOffSet = stream.Position;
writer.Write((uint)0);
crcBodyOffSet = stream.Position;
}
writer.Write(TypeSerializerFlags);
// Reserve place to write type serializers data sections offsets
var offsetsPosition = stream.Position;
stream.Position += 2 * sizeof(long);
// Write metrics data
this.WriteMetricsData(writer, metricData);
// Write cached metrics metadata and offset
var serializerDataPosition = stream.Position;
stream.Position = offsetsPosition;
writer.Write(serializerDataPosition - startStreamPosition);
offsetsPosition = stream.Position;
stream.Position = serializerDataPosition;
SerializationUtils.WriteUInt32AsBase128(writer, (uint)this.metadatas.Count);
this.metadatas.ForEach(m => this.WriteMetricMetadata(writer, m));
// Write cached strings and offset
serializerDataPosition = stream.Position;
stream.Position = offsetsPosition;
writer.Write(serializerDataPosition - startStreamPosition);
stream.Position = serializerDataPosition;
SerializationUtils.WriteUInt32AsBase128(writer, (uint)this.strings.Count);
this.strings.ForEach(writer.Write);
var endOfStream = stream.Position;
if (this.version >= 5)
{
stream.Position = crcBodyOffSet;
var crc = Crc.ComputeCrc(0, stream, stream.Length - crcBodyOffSet);
stream.Position = crcOffSet;
writer.Write(crc);
}
stream.Position = endOfStream;
}
}
catch (IOException ioException)
{
throw new MetricSerializationException("Failed to serialize data.", ioException);
}
finally
{
this.nextStringIndex = 0;
this.stringIndexes.Clear();
this.strings.Clear();
this.nextMetadataIndex = 0;
this.metadataIndexes.Clear();
this.metadatas.Clear();
this.currentMetricDataBlockSize = 0;
this.currentMetadataDictionaryBlockSize = 0;
this.currentStringDictionaryBlockSize = 0;
}
}
