/// <summary>
/// Causes the <see cref="StatisticsReader"/> to open the archive file and retrieve the statistics.
/// </summary>
public void Open()
{
m_archiveReader = new ArchiveReader();
m_archiveReader.Open(ArchiveFilePath);
m_metadataRecords = m_archiveReader.MetadataFile.Read()
.Where(record => !string.IsNullOrEmpty(record.Name))
.ToList();
}
/// <summary>
/// Attempts to connect to this <see cref="LocalInputAdapter"/>.
/// </summary>
protected override void AttemptConnection()
{
// This adapter is only engaged for history, so we don't process any data unless a temporal constraint is defined
if (this.TemporalConstraintIsDefined())
{
// Turn off read timer if it's active
m_readTimer.Enabled = false;
// Attempt to open historian files
if (Directory.Exists(m_archiveLocation))
{
// Specified directory is a valid one.
string[] matches = Directory.GetFiles(m_archiveLocation, "*_archive*.d");
if (matches.Length > 0)
{
// Capture the instance name
string fileName = matches[0].Remove(matches[0].IndexOf("_archive", StringComparison.OrdinalIgnoreCase)) + "_archive.d";
// Setup historian reader
m_archiveReader = new ArchiveReader();
m_archiveReader.HistoricFileListBuildStart += m_archiveReader_HistoricFileListBuildStart;
m_archiveReader.HistoricFileListBuildComplete += m_archiveReader_HistoricFileListBuildComplete;
m_archiveReader.HistoricFileListBuildException += m_archiveReader_HistoricFileListBuildException;
m_archiveReader.DataReadException += m_archiveReader_DataReadException;
// Open the active archive
m_archiveReader.Open(fileName, m_archiveLocation);
try
{
// Start the data reader on its own thread so connection attempt can complete in a timely fashion...
ThreadPool.QueueUserWorkItem(StartDataReader);
}
catch (Exception ex)
{
// Process exception for logging
OnProcessException(MessageLevel.Warning, new InvalidOperationException("Failed to start data reader due to exception: " + ex.Message, ex));
}
}
}
else
{
OnProcessException(MessageLevel.Warning, new InvalidOperationException("Cannot open historian files, directory does not exist: " + m_archiveLocation));
}
}
}
