private void ProcessMeasurements(IEnumerable <IMeasurement> measurements)
{
// Includes data packet flags and measurement count
const int PacketHeaderSize = DataPublisher.ClientResponseHeaderSize + 5;
List <IBinaryMeasurement> packet;
int packetSize;
bool usePayloadCompression;
bool useCompactMeasurementFormat;
BufferBlockMeasurement bufferBlockMeasurement;
byte[] bufferBlock;
ushort bufferBlockSignalIndex;
IBinaryMeasurement binaryMeasurement;
int binaryLength;
try
{
if (!Enabled)
{
return;
}
packet = new List <IBinaryMeasurement>();
packetSize = PacketHeaderSize;
usePayloadCompression = m_usePayloadCompression;
useCompactMeasurementFormat = m_useCompactMeasurementFormat || usePayloadCompression;
foreach (IMeasurement measurement in measurements)
{
bufferBlockMeasurement = measurement as BufferBlockMeasurement;
if ((object)bufferBlockMeasurement != null)
{
// Still sending buffer block measurements to client; we are expecting
// confirmations which will indicate whether retransmission is necessary,
// so we will restart the retransmission timer
m_bufferBlockRetransmissionTimer.Stop();
// Handle buffer block measurements as a special case - this can be any kind of data,
// measurement subscriber will need to know how to interpret buffer
bufferBlock = new byte[6 + bufferBlockMeasurement.Length];
// Prepend sequence number
BigEndian.CopyBytes(m_bufferBlockSequenceNumber, bufferBlock, 0);
m_bufferBlockSequenceNumber++;
// Copy signal index into buffer
bufferBlockSignalIndex = m_signalIndexCache.GetSignalIndex(bufferBlockMeasurement.ID);
BigEndian.CopyBytes(bufferBlockSignalIndex, bufferBlock, 4);
// Append measurement data and send
Buffer.BlockCopy(bufferBlockMeasurement.Buffer, 0, bufferBlock, 6, bufferBlockMeasurement.Length);
m_parent.SendClientResponse(m_workingBuffer, m_clientID, ServerResponse.BufferBlock, ServerCommand.Subscribe, bufferBlock);
lock (m_bufferBlockCacheLock)
{
// Cache buffer block for retransmission
m_bufferBlockCache.Add(bufferBlock);
}
// Start the retransmission timer in case we never receive a confirmation
m_bufferBlockRetransmissionTimer.Start();
}
else
{
// Serialize the current measurement.
if (useCompactMeasurementFormat)
{
binaryMeasurement = new CompactMeasurement(measurement, m_signalIndexCache, m_includeTime, m_baseTimeOffsets, m_timeIndex, m_useMillisecondResolution);
}
else
{
binaryMeasurement = new SerializableMeasurement(measurement, m_parent.GetClientEncoding(m_clientID));
}
// Determine the size of the measurement in bytes.
binaryLength = binaryMeasurement.BinaryLength;
// If the current measurement will not fit in the packet based on the max
// packet size, process the current packet and start a new packet.
if (packetSize + binaryLength > DataPublisher.MaxPacketSize)
{
ProcessBinaryMeasurements(packet, useCompactMeasurementFormat, usePayloadCompression);
packet.Clear();
packetSize = PacketHeaderSize;
}
// Add the current measurement to the packet.
packet.Add(binaryMeasurement);
packetSize += binaryLength;
}
}
// Process the remaining measurements.
if (packet.Count > 0)
{
ProcessBinaryMeasurements(packet, useCompactMeasurementFormat, usePayloadCompression);
}
IncrementProcessedMeasurements(measurements.Count());
// Update latency statistics
m_parent.UpdateLatencyStatistics(measurements.Select(m => (long)(m_lastPublishTime - m.Timestamp)));
}
catch (Exception ex)
{
string message = string.Format("Error processing measurements: {0}", ex.Message);
OnProcessException(new InvalidOperationException(message, ex));
}
}
/// <summary>
/// Publish <see cref="IFrame"/> of time-aligned collection of <see cref="IMeasurement"/> values that arrived within the
/// concentrator's defined <see cref="ConcentratorBase.LagTime"/>.
/// </summary>
/// <param name="frame"><see cref="IFrame"/> of measurements with the same timestamp that arrived within <see cref="ConcentratorBase.LagTime"/> that are ready for processing.</param>
/// <param name="index">Index of <see cref="IFrame"/> within a second ranging from zero to <c><see cref="ConcentratorBase.FramesPerSecond"/> - 1</c>.</param>
protected override void PublishFrame(IFrame frame, int index)
{
if ((object)m_parent == null || m_disposed)
{
return;
}
if (m_usePayloadCompression && m_compressionModes.HasFlag(CompressionModes.TSSC))
{
ProcessTSSCMeasurements(frame);
return;
}
// Includes data packet flags, frame level timestamp and measurement count
const int PacketHeaderSize = DataPublisher.ClientResponseHeaderSize + 13;
List <IBinaryMeasurement> packet = new List <IBinaryMeasurement>();
bool usePayloadCompression = m_usePayloadCompression;
bool useCompactMeasurementFormat = m_useCompactMeasurementFormat || usePayloadCompression;
long frameLevelTimestamp = frame.Timestamp;
BufferBlockMeasurement bufferBlockMeasurement;
IBinaryMeasurement binaryMeasurement;
byte[] bufferBlock;
int binaryLength;
int packetSize = PacketHeaderSize;
long publishTime;
foreach (IMeasurement measurement in frame.Measurements.Values)
{
bufferBlockMeasurement = measurement as BufferBlockMeasurement;
if ((object)bufferBlockMeasurement != null)
{
// Still sending buffer block measurements to client; we are expecting
// confirmations which will indicate whether retransmission is necessary,
// so we will restart the retransmission timer
m_bufferBlockRetransmissionTimer.Stop();
// Handle buffer block measurements as a special case - this can be any kind of data,
// measurement subscriber will need to know how to interpret buffer
bufferBlock = new byte[4 + bufferBlockMeasurement.Length];
// Prepend sequence number
BigEndian.CopyBytes(m_bufferBlockSequenceNumber, bufferBlock, 0);
m_bufferBlockSequenceNumber++;
// Append measurement data and send
Buffer.BlockCopy(bufferBlockMeasurement.Buffer, 0, bufferBlock, 4, bufferBlockMeasurement.Length);
m_parent.SendClientResponse(m_clientID, ServerResponse.BufferBlock, ServerCommand.Subscribe, bufferBlock);
lock (m_bufferBlockCacheLock)
{
// Cache buffer block for retransmission
m_bufferBlockCache.Add(bufferBlock);
}
// Start the retransmission timer in case we never receive a confirmation
m_bufferBlockRetransmissionTimer.Start();
}
else
{
// Serialize the current measurement.
if (useCompactMeasurementFormat)
{
binaryMeasurement = new CompactMeasurement(measurement, m_signalIndexCache, false);
}
else
{
binaryMeasurement = new SerializableMeasurement(measurement, m_parent.GetClientEncoding(ClientID));
}
// Determine the size of the measurement in bytes.
binaryLength = binaryMeasurement.BinaryLength;
// If the current measurement will not fit in the packet based on
// the max packet size, process the packet and start a new one.
if (packetSize + binaryLength > DataPublisher.MaxPacketSize)
{
ProcessBinaryMeasurements(packet, frameLevelTimestamp, useCompactMeasurementFormat, usePayloadCompression);
packet.Clear();
packetSize = PacketHeaderSize;
}
// Add the measurement to the packet.
packet.Add(binaryMeasurement);
packetSize += binaryLength;
}
}
// Process the remaining measurements.
if (packet.Count > 0)
{
ProcessBinaryMeasurements(packet, frameLevelTimestamp, useCompactMeasurementFormat, usePayloadCompression);
}
// Update latency statistics
publishTime = DateTime.UtcNow.Ticks;
m_parent.UpdateLatencyStatistics(frame.Measurements.Values.Select(m => (long)(publishTime - m.Timestamp)));
}