private void ProcessServerResponse(byte[] buffer, int length)
{
// Currently this work is done on the async socket completion thread, make sure work to be done is timely and if the response processing
// is coming in via the command channel and needs to send a command back to the server, it should be done on a separate thread...
if (buffer != null && length > 0)
{
try
{
ServerResponse responseCode = (ServerResponse)buffer[0];
ServerCommand commandCode = (ServerCommand)buffer[1];
int responseLength = EndianOrder.BigEndian.ToInt32(buffer, 2);
int responseIndex = DataPublisher.ClientResponseHeaderSize;
bool solicited = false;
byte[][][] keyIVs;
// See if this was a solicited response to a requested server command
if (responseCode.IsSolicited())
{
lock (m_requests)
{
int index = m_requests.BinarySearch(commandCode);
if (index >= 0)
{
solicited = true;
m_requests.RemoveAt(index);
}
}
// Disconnect any established UDP data channel upon successful unsubscribe
if (solicited && commandCode == ServerCommand.Unsubscribe && responseCode == ServerResponse.Succeeded)
DataChannel = null;
}
switch (responseCode)
{
case ServerResponse.Succeeded:
if (solicited)
{
switch (commandCode)
{
case ServerCommand.Authenticate:
OnStatusMessage("Success code received in response to server command \"{0}\": {1}", commandCode, InterpretResponseMessage(buffer, responseIndex, responseLength));
m_authenticated = true;
OnConnectionAuthenticated();
break;
case ServerCommand.Subscribe:
OnStatusMessage("Success code received in response to server command \"{0}\": {1}", commandCode, InterpretResponseMessage(buffer, responseIndex, responseLength));
m_subscribed = true;
if ((object)m_dataStreamMonitor != null)
m_dataStreamMonitor.Enabled = true;
break;
case ServerCommand.Unsubscribe:
OnStatusMessage("Success code received in response to server command \"{0}\": {1}", commandCode, InterpretResponseMessage(buffer, responseIndex, responseLength));
m_subscribed = false;
if ((object)m_dataStreamMonitor != null)
m_dataStreamMonitor.Enabled = false;
break;
case ServerCommand.RotateCipherKeys:
OnStatusMessage("Success code received in response to server command \"{0}\": {1}", commandCode, InterpretResponseMessage(buffer, responseIndex, responseLength));
break;
case ServerCommand.MetaDataRefresh:
OnStatusMessage("Success code received in response to server command \"{0}\": latest meta-data received.", commandCode);
OnMetaDataReceived(DeserializeMetadata(buffer.BlockCopy(responseIndex, responseLength)));
break;
}
}
else
{
switch (commandCode)
{
case ServerCommand.MetaDataRefresh:
// Meta-data refresh may be unsolicited
OnStatusMessage("Received server confirmation for unsolicited request to \"{0}\" command: latest meta-data received.", commandCode);
OnMetaDataReceived(DeserializeMetadata(buffer.BlockCopy(responseIndex, responseLength)));
break;
case ServerCommand.RotateCipherKeys:
// Key rotation may be unsolicited
OnStatusMessage("Received server confirmation for unsolicited request to \"{0}\" command: {1}", commandCode, InterpretResponseMessage(buffer, responseIndex, responseLength));
break;
case ServerCommand.Subscribe:
OnStatusMessage("Received unsolicited response to \"{0}\" command: {1}", commandCode, InterpretResponseMessage(buffer, responseIndex, responseLength));
break;
default:
OnProcessException(new InvalidOperationException("Publisher sent a success code for an unsolicited server command: " + commandCode));
break;
}
}
break;
case ServerResponse.Failed:
if (solicited)
OnStatusMessage("Failure code received in response to server command \"{0}\": {1}", commandCode, InterpretResponseMessage(buffer, responseIndex, responseLength));
else
OnProcessException(new InvalidOperationException("Publisher sent a failed code for an unsolicited server command: " + commandCode));
break;
case ServerResponse.DataPacket:
long now = DateTime.UtcNow.Ticks;
// Deserialize data packet
List<IMeasurement> measurements = new List<IMeasurement>();
DataPacketFlags flags;
Ticks timestamp = 0;
int count;
// Track total data packet bytes received from any channel
m_totalBytesReceived += m_lastBytesReceived;
m_monitoredBytesReceived += m_lastBytesReceived;
// Get data packet flags
flags = (DataPacketFlags)buffer[responseIndex];
responseIndex++;
bool synchronizedMeasurements = ((byte)(flags & DataPacketFlags.Synchronized) > 0);
bool compactMeasurementFormat = ((byte)(flags & DataPacketFlags.Compact) > 0);
bool compressedPayload = ((byte)(flags & DataPacketFlags.Compressed) > 0);
int cipherIndex = (flags & DataPacketFlags.CipherIndex) > 0 ? 1 : 0;
// Decrypt data packet payload if keys are available
if (m_keyIVs != null)
{
// Get a local copy of volatile keyIVs reference since this can change at any time
keyIVs = m_keyIVs;
// Decrypt payload portion of data packet
buffer = Common.SymmetricAlgorithm.Decrypt(buffer, responseIndex, responseLength - 1, keyIVs[cipherIndex][0], keyIVs[cipherIndex][1]);
responseIndex = 0;
responseLength = buffer.Length;
}
// Synchronized packets contain a frame level timestamp
if (synchronizedMeasurements)
{
timestamp = EndianOrder.BigEndian.ToInt64(buffer, responseIndex);
responseIndex += 8;
}
// Deserialize number of measurements that follow
count = EndianOrder.BigEndian.ToInt32(buffer, responseIndex);
responseIndex += 4;
if (compressedPayload)
{
if ((object)m_signalIndexCache == null && m_lastMissingCacheWarning + MissingCacheWarningInterval < now)
{
if (m_lastMissingCacheWarning != 0L)
{
// Warning message for missing signal index cache
OnStatusMessage("WARNING: Signal index cache has not arrived. No compact measurements can be parsed.");
}
m_lastMissingCacheWarning = now;
}
else
{
try
{
// Decompress compact measurements from payload
measurements.AddRange(buffer.DecompressPayload(m_signalIndexCache, responseIndex, responseLength - responseIndex + DataPublisher.ClientResponseHeaderSize, count, m_includeTime, flags));
}
catch (Exception ex)
{
OnProcessException(new InvalidOperationException("WARNING: Decompression failure: " + ex.Message, ex));
}
}
}
else
{
// Deserialize measurements
for (int i = 0; i < count; i++)
{
if (!compactMeasurementFormat)
{
// Deserialize full measurement format
SerializableMeasurement measurement = new SerializableMeasurement(m_encoding);
responseIndex += measurement.ParseBinaryImage(buffer, responseIndex, responseLength - responseIndex);
measurements.Add(measurement);
}
else if ((object)m_signalIndexCache != null)
{
// Deserialize compact measurement format
CompactMeasurement measurement = new CompactMeasurement(m_signalIndexCache, m_includeTime, m_baseTimeOffsets, m_timeIndex, m_useMillisecondResolution);
responseIndex += measurement.ParseBinaryImage(buffer, responseIndex, responseLength - responseIndex);
// Apply timestamp from frame if not included in transmission
if (!measurement.IncludeTime)
measurement.Timestamp = timestamp;
measurements.Add(measurement);
}
else if (m_lastMissingCacheWarning + MissingCacheWarningInterval < now)
{
if (m_lastMissingCacheWarning != 0L)
{
// Warning message for missing signal index cache
OnStatusMessage("WARNING: Signal index cache has not arrived. No compact measurements can be parsed.");
}
m_lastMissingCacheWarning = now;
}
}
}
// Provide new measurements to local concentrator, if defined, otherwise directly expose them to the consumer
if ((object)m_localConcentrator != null)
m_localConcentrator.SortMeasurements(measurements);
else
OnNewMeasurements(measurements);
break;
case ServerResponse.DataStartTime:
// Raise data start time event
OnDataStartTime(EndianOrder.BigEndian.ToInt64(buffer, responseIndex));
break;
case ServerResponse.ProcessingComplete:
// Raise input processing completed event
OnProcessingComplete(InterpretResponseMessage(buffer, responseIndex, responseLength));
break;
case ServerResponse.UpdateSignalIndexCache:
// Deserialize new signal index cache
m_remoteSignalIndexCache = DeserializeSignalIndexCache(buffer.BlockCopy(responseIndex, responseLength));
m_signalIndexCache = new SignalIndexCache(DataSource, m_remoteSignalIndexCache);
break;
case ServerResponse.UpdateBaseTimes:
// Get active time index
m_timeIndex = EndianOrder.BigEndian.ToInt32(buffer, responseIndex);
responseIndex += 4;
// Deserialize new base time offsets
m_baseTimeOffsets = new long[] { EndianOrder.BigEndian.ToInt64(buffer, responseIndex), EndianOrder.BigEndian.ToInt64(buffer, responseIndex + 8) };
break;
case ServerResponse.UpdateCipherKeys:
// Get active cipher index
m_cipherIndex = buffer[responseIndex++];
// Extract remaining response
byte[] bytes = buffer.BlockCopy(responseIndex, responseLength - 1);
// Decrypt response payload if subscription is authenticated
if (m_authenticated)
bytes = bytes.Decrypt(m_sharedSecret, CipherStrength.Aes256);
// Deserialize new cipher keys
keyIVs = new byte[2][][];
keyIVs[EvenKey] = new byte[2][];
keyIVs[OddKey] = new byte[2][];
int index = 0;
int bufferLen;
// Read even key size
bufferLen = EndianOrder.BigEndian.ToInt32(bytes, index);
index += 4;
// Read even key
keyIVs[EvenKey][KeyIndex] = new byte[bufferLen];
Buffer.BlockCopy(bytes, index, keyIVs[EvenKey][KeyIndex], 0, bufferLen);
index += bufferLen;
// Read even initialization vector size
bufferLen = EndianOrder.BigEndian.ToInt32(bytes, index);
index += 4;
// Read even initialization vector
keyIVs[EvenKey][IVIndex] = new byte[bufferLen];
Buffer.BlockCopy(bytes, index, keyIVs[EvenKey][IVIndex], 0, bufferLen);
index += bufferLen;
// Read odd key size
bufferLen = EndianOrder.BigEndian.ToInt32(bytes, index);
index += 4;
// Read odd key
keyIVs[OddKey][KeyIndex] = new byte[bufferLen];
Buffer.BlockCopy(bytes, index, keyIVs[OddKey][KeyIndex], 0, bufferLen);
index += bufferLen;
// Read odd initialization vector size
bufferLen = EndianOrder.BigEndian.ToInt32(bytes, index);
index += 4;
// Read odd initialization vector
keyIVs[OddKey][IVIndex] = new byte[bufferLen];
Buffer.BlockCopy(bytes, index, keyIVs[OddKey][IVIndex], 0, bufferLen);
index += bufferLen;
// Exchange keys
m_keyIVs = keyIVs;
OnStatusMessage("Successfully established new cipher keys for data packet transmissions.");
break;
}
}
catch (Exception ex)
{
OnProcessException(new InvalidOperationException("Failed to process publisher response packet due to exception: " + ex.Message, ex));
}
}
}
// Retrieves the measurements from the database.
private void GetDbMeasurements(object state)
{
IDbConnection connection = null;
// Get measurements from the database.
try
{
SignalIndexCache signalIndexCache = new SignalIndexCache();
CompactMeasurement measurement;
long startTime = DateTime.UtcNow.Ticks;
if (m_cacheFileName != null && File.Exists(m_cacheFileName))
{
OnStatusMessage("Loading cached input data...");
try
{
using (FileStream data = File.OpenRead(m_cacheFileName))
{
byte[] buffer = new byte[4];
int signalIndexCacheImageSize;
int compactMeasurementSize;
int totalMeasurements;
// Read the signal index cache image size from the file
if (data.Read(buffer, 0, 4) != 4)
throw new EndOfStreamException();
signalIndexCacheImageSize = EndianOrder.LittleEndian.ToInt32(buffer, 0);
// Resize buffer to accomodate exact signal index cache
buffer = new byte[signalIndexCacheImageSize];
// Read the signal index cache image from the file
if (data.Read(buffer, 0, signalIndexCacheImageSize) != signalIndexCacheImageSize)
throw new EndOfStreamException();
// Deserialize the signal index cache
signalIndexCache = Serialization.Deserialize<SignalIndexCache>(buffer, TVA.SerializationFormat.Binary);
// Read the size of each compact measurement from the file
if (data.Read(buffer, 0, 4) != 4)
throw new EndOfStreamException();
compactMeasurementSize = EndianOrder.LittleEndian.ToInt32(buffer, 0);
// Read the total number of compact measurements from the file
if (data.Read(buffer, 0, 4) != 4)
throw new EndOfStreamException();
totalMeasurements = EndianOrder.LittleEndian.ToInt32(buffer, 0);
// Resize buffer to accomodate compact measurement if needed (not likely)
if (buffer.Length < compactMeasurementSize)
buffer = new byte[compactMeasurementSize];
// Read each compact measurement image from the file
for (int i = 0; i < totalMeasurements; i++)
{
if (data.Read(buffer, 0, compactMeasurementSize) != compactMeasurementSize)
throw new EndOfStreamException();
// Parse compact measurement
measurement = new CompactMeasurement(signalIndexCache);
measurement.ParseBinaryImage(buffer, 0, compactMeasurementSize);
m_dbMeasurements.Add(measurement);
if (m_dbMeasurements.Count % 50000 == 0)
OnStatusMessage("Loaded {0} records so far...", m_dbMeasurements.Count);
}
OnStatusMessage("Completed data load in {0}", ((Ticks)(DateTime.UtcNow.Ticks - startTime)).ToElapsedTimeString(4));
}
}
catch (Exception ex)
{
if (ex is EndOfStreamException)
throw (EndOfStreamException)ex;
throw new EndOfStreamException(ex.Message, ex);
}
}
else
{
OnStatusMessage("Loading database input data...");
const string MeasurementTable = "ActiveMeasurements";
Dictionary<string, string> dataProviderSettings = m_dataProviderString.ParseKeyValuePairs();
Assembly assm = Assembly.Load(dataProviderSettings["AssemblyName"]);
Type connectionType = assm.GetType(dataProviderSettings["ConnectionType"]);
Dictionary<Guid, MeasurementKey> lookupCache = new Dictionary<Guid, MeasurementKey>();
IDbCommand command;
IDataReader dbReader;
MeasurementKey key;
Guid id;
ushort index = 0;
connection = (IDbConnection)Activator.CreateInstance(connectionType);
connection.ConnectionString = m_dbConnectionString;
connection.Open();
command = connection.CreateCommand();
command.CommandText = string.Format("SELECT * FROM {0}", m_dbTableName);
using (dbReader = command.ExecuteReader())
{
while (dbReader.Read())
{
measurement = new CompactMeasurement(signalIndexCache);
foreach (string fieldName in m_fieldNames.Keys)
{
object value = dbReader[fieldName];
string propertyName = m_fieldNames[fieldName];
switch (propertyName)
{
case "Timestamp":
// If the value is a timestamp, use the timestamp format
// specified by the user when reading the timestamp.
if (m_timestampFormat == null)
measurement.Timestamp = long.Parse(value.ToNonNullString());
else
measurement.Timestamp = DateTime.ParseExact(value.ToNonNullString(), m_timestampFormat, CultureInfo.CurrentCulture);
break;
case "ID":
if (Guid.TryParse(value.ToString(), out id))
{
if (!lookupCache.TryGetValue(id, out key))
{
if (DataSource.Tables.Contains(MeasurementTable))
{
DataRow[] filteredRows = DataSource.Tables[MeasurementTable].Select(string.Format("SignalID = '{0}'", id));
if (filteredRows.Length > 0)
MeasurementKey.TryParse(filteredRows[0]["ID"].ToString(), id, out key);
}
if (key != default(MeasurementKey))
{
// Cache measurement key associated with ID
lookupCache[id] = key;
// Assign a runtime index optimization for distinct measurements
signalIndexCache.Reference.TryAdd(index++, new Tuple<Guid, string, uint>(id, key.Source, key.ID));
}
}
measurement.ID = id;
measurement.Key = key;
}
break;
case "Key":
if (MeasurementKey.TryParse(value.ToString(), Guid.Empty, out key))
{
// Attempt to update empty signal ID if available
if (key.SignalID == Guid.Empty)
{
if (DataSource.Tables.Contains(MeasurementTable))
{
DataRow[] filteredRows = DataSource.Tables[MeasurementTable].Select(string.Format("ID = '{0}'", key.ToString()));
if (filteredRows.Length > 0)
key.SignalID = filteredRows[0]["SignalID"].ToNonNullString(Guid.Empty.ToString()).ConvertToType<Guid>();
}
}
if (key.SignalID != Guid.Empty)
{
measurement.ID = key.SignalID;
if (!lookupCache.ContainsKey(measurement.ID))
{
// Cache measurement key associated with ID
lookupCache[measurement.ID] = key;
// Assign a runtime index optimization for distinct measurements
signalIndexCache.Reference.TryAdd(index++, new Tuple<Guid, string, uint>(measurement.ID, key.Source, key.ID));
}
}
measurement.Key = key;
}
break;
case "Value":
measurement.Value = Convert.ToDouble(value);
break;
default:
PropertyInfo property = GetAllProperties(typeof(IMeasurement)).FirstOrDefault(propertyInfo => propertyInfo.Name == propertyName);
if (property != null)
{
Type propertyType = property.PropertyType;
Type valueType = value.GetType();
if (property.PropertyType.IsAssignableFrom(value.GetType()))
{
property.SetValue(measurement, value, null);
}
else if (property.PropertyType == typeof(string))
{
property.SetValue(measurement, value.ToNonNullString(), null);
}
else if (valueType == typeof(string))
{
MethodInfo parseMethod = propertyType.GetMethod("Parse", new Type[] { typeof(string) });
if (parseMethod != null && parseMethod.IsStatic)
property.SetValue(measurement, parseMethod.Invoke(null, new object[] { value }), null);
}
else
{
string exceptionMessage = string.Format("The type of field {0} could not be converted to the type of property {1}.", fieldName, propertyName);
OnProcessException(new InvalidCastException(exceptionMessage));
}
}
else
{
string exceptionMessage = string.Format("The type of field {0} could not be converted to the type of property {1} - no property match was found.", fieldName, propertyName);
OnProcessException(new InvalidCastException(exceptionMessage));
}
break;
}
m_dbMeasurements.Add(measurement);
if (m_dbMeasurements.Count % 50000 == 0)
OnStatusMessage("Loaded {0} records so far...", m_dbMeasurements.Count);
}
}
}
OnStatusMessage("Sorting data by time...");
m_dbMeasurements = m_dbMeasurements.OrderBy(m => (long)m.Timestamp).ToList();
OnStatusMessage("Completed data load in {0}", ((Ticks)(DateTime.UtcNow.Ticks - startTime)).ToElapsedTimeString(4));
if (m_cacheFileName != null)
{
OnStatusMessage("Caching data for next initialization...");
using (FileStream data = File.OpenWrite(m_cacheFileName))
{
byte[] signalIndexCacheImage = Serialization.Serialize(signalIndexCache, TVA.SerializationFormat.Binary);
int compactMeasurementSize = (new CompactMeasurement(signalIndexCache)).BinaryLength;
// Write the signal index cache image size to the file
data.Write(EndianOrder.LittleEndian.GetBytes(signalIndexCacheImage.Length), 0, 4);
// Write the signal index cache image to the file
data.Write(signalIndexCacheImage, 0, signalIndexCacheImage.Length);
// Write the size of each compact measurement to the file
data.Write(EndianOrder.LittleEndian.GetBytes(compactMeasurementSize), 0, 4);
// Write the total number of compact measurements to the file
data.Write(EndianOrder.LittleEndian.GetBytes(m_dbMeasurements.Count), 0, 4);
// Write each compact measurement image to the file
for (int i = 0; i < m_dbMeasurements.Count; i++)
{
((ISupportBinaryImage)m_dbMeasurements[i]).CopyBinaryImageToStream(data);
}
}
}
}
OnStatusMessage("Entering data read cycle...");
ThreadPool.QueueUserWorkItem(PublishData);
}
catch (EndOfStreamException ex)
{
OnProcessException(new EndOfStreamException(string.Format("Failed load cached data from {0} due to file corruption{1} cache will be recreated from database", m_cacheFileName, string.IsNullOrWhiteSpace(ex.Message) ? "," : ": " + ex.Message + " - ")));
// If the cached file is corrupt, delete it and load from the database
if (File.Exists(m_cacheFileName))
File.Delete(m_cacheFileName);
m_dbMeasurements.Clear();
GetDbMeasurements(null);
}
catch (Exception ex)
{
OnProcessException(new InvalidOperationException("Failed during data load: " + ex.Message, ex));
}
finally
{
if (connection != null)
connection.Close();
}
}
/// <summary>
/// Decompresses <see cref="CompactMeasurement"/> values from the given <paramref name="source"/> buffer.
/// </summary>
/// <param name="source">Buffer with compressed <see cref="CompactMeasurement"/> payload.</param>
/// <param name="signalIndexCache">Current <see cref="SignalIndexCache"/>.</param>
/// <param name="index">Index into buffer where compressed payload begins.</param>
/// <param name="dataLength">Length of all data within <paramref name="source"/> buffer.</param>
/// <param name="measurementCount">Number of compressed measurements in the payload.</param>
/// <param name="includeTime">Flag that determines if timestamps as included in the payload.</param>
/// <param name="flags">Current <see cref="DataPacketFlags"/>.</param>
/// <returns>Decompressed <see cref="CompactMeasurement"/> values from the given <paramref name="source"/> buffer.</returns>
public static CompactMeasurement[] DecompressPayload(this byte[] source, SignalIndexCache signalIndexCache, int index, int dataLength, int measurementCount, bool includeTime, DataPacketFlags flags)
{
CompactMeasurement[] measurements = new CompactMeasurement[measurementCount];
byte[] buffer = null;
try
{
// Actual data length has to take into account response byte and in-response-to server command byte in the payload header
//int dataLength = length - index - 2;
int bufferLength = PatternDecompressor.MaximumSizeDecompressed(dataLength);
// Copy source data into a decompression buffer
buffer = BufferPool.TakeBuffer(bufferLength);
Buffer.BlockCopy(source, index, buffer, 0, dataLength);
// Check that OS endian-order matches endian-order of compressed data
if (!(BitConverter.IsLittleEndian && (flags & DataPacketFlags.LittleEndianCompression) > 0))
{
// TODO: Set a flag, e.g., Endianness decompressAs, to pass into pattern decompressor so it
// can be modified to decompress a payload that is non-native Endian order
throw new NotImplementedException("Cannot currently decompress payload that is not in native endian-order.");
}
// Attempt to decompress buffer
int uncompressedSize = PatternDecompressor.DecompressBuffer(buffer, 0, dataLength, bufferLength);
if (uncompressedSize == 0)
throw new InvalidOperationException("Failed to decompress payload buffer - possible data corruption.");
index = 0;
// Decode ID and state flags
for (int i = 0; i < measurementCount; i++)
{
uint value = NativeEndianOrder.Default.ToUInt32(buffer, index);
measurements[i] = new CompactMeasurement(signalIndexCache, includeTime)
{
CompactStateFlags = (byte)(value >> 16),
RuntimeID = (ushort)value
};
index += 4;
}
// Decode values
for (int i = 0; i < measurementCount; i++)
{
measurements[i].Value = NativeEndianOrder.Default.ToSingle(buffer, index);
index += 4;
}
if (includeTime)
{
// Decode timestamps
for (int i = 0; i < measurementCount; i++)
{
measurements[i].Timestamp = NativeEndianOrder.Default.ToInt64(buffer, index);
index += 8;
}
}
}
finally
{
if ((object)buffer != null)
BufferPool.ReturnBuffer(buffer);
}
return measurements;
}
/// <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;
// 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;
IBinaryMeasurement binaryMeasurement;
int packetSize = PacketHeaderSize;
int binaryLength;
foreach (IMeasurement measurement in frame.Measurements.Values)
{
// 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.
ProcessBinaryMeasurements(packet, frameLevelTimestamp, useCompactMeasurementFormat, usePayloadCompression);
}