/// <summary>
/// Creates a new <see cref="DataPointScanner"/> instance.
/// </summary>
/// <param name="dataBlockAllocationTable"><see cref="ArchiveFileAllocationTable"/> for the file to be scanned.</param>
/// <param name="historianID">Historian ID to scan for.</param>
/// <param name="startTime">Desired start time.</param>
/// <param name="endTime">Desired end time.</param>
/// <param name="includeStartTime">True to include data points equal to the start time; false to exclude.</param>
/// <param name="dataReadExceptionHandler">Read exception handler.</param>
public DataPointScanner(ArchiveFileAllocationTable dataBlockAllocationTable, int historianID, TimeTag startTime, TimeTag endTime, bool includeStartTime, EventHandler<EventArgs<Exception>> dataReadExceptionHandler)
{
// Find all data blocks for desired point over given time range
m_dataBlocks = dataBlockAllocationTable.FindDataBlocks(historianID, startTime, endTime, false);
m_startTime = startTime;
m_endTime = endTime;
m_historianID = historianID;
m_includeStartTime = includeStartTime;
m_dataReadExceptionHandler = dataReadExceptionHandler;
}
/// <summary>
/// Creates a new <see cref="DataPointScanner"/> instance.
/// </summary>
/// <param name="dataBlockAllocationTable"><see cref="ArchiveFileAllocationTable"/> for the file to be scanned.</param>
/// <param name="historianID">Historian ID to scan for.</param>
/// <param name="startTime">Desired start time.</param>
/// <param name="endTime">Desired end time.</param>
/// <param name="includeStartTime">True to include data points equal to the start time; false to exclude.</param>
/// <param name="dataReadExceptionHandler">Read exception handler.</param>
public DataPointScanner(ArchiveFileAllocationTable dataBlockAllocationTable, int historianID, TimeTag startTime, TimeTag endTime, bool includeStartTime, EventHandler <EventArgs <Exception> > dataReadExceptionHandler)
{
// Find all data blocks for desired point over given time range
m_dataBlocks = dataBlockAllocationTable.FindDataBlocks(historianID, startTime, endTime, false);
m_startTime = startTime;
m_endTime = endTime;
m_historianID = historianID;
m_includeStartTime = includeStartTime;
m_dataReadExceptionHandler = dataReadExceptionHandler;
}
/// <summary>
/// Creates a new instance of the <see cref="FixedTableRegion"/>.
/// </summary>
/// <param name="parent">Reference to parent <see cref="ArchiveFileAllocationTable"/>.</param>
public FixedTableRegion(ArchiveFileAllocationTable parent)
{
m_parent = parent;
}
/// <summary>
/// Creates a new instance of the <see cref="VariableTableRegion"/>.
/// </summary>
/// <param name="parent">Reference to parent <see cref="ArchiveFileAllocationTable"/>.</param>
public VariableTableRegion(ArchiveFileAllocationTable parent)
{
m_parent = parent;
}
/// <summary>
/// Creates a new instance of the <see cref="FixedTableRegion"/>.
/// </summary>
/// <param name="parent">Reference to parent <see cref="ArchiveFileAllocationTable"/>.</param>
public FixedTableRegion(ArchiveFileAllocationTable parent)
{
m_parent = parent;
}
/// <summary>
/// Creates a new instance of the <see cref="VariableTableRegion"/>.
/// </summary>
/// <param name="parent">Reference to parent <see cref="ArchiveFileAllocationTable"/>.</param>
public VariableTableRegion(ArchiveFileAllocationTable parent)
{
m_parent = parent;
}
internal void CloseStream()
{
m_fat = null;
if ((object)m_fileStream != null)
{
lock (m_fileStream)
{
m_fileStream.Flush();
m_fileStream.Close();
m_fileStream.Dispose();
}
m_fileStream = null;
}
}
internal void OpenStream()
{
if (File.Exists(m_fileName))
{
int attempts = 0;
while (true)
{
try
{
attempts++;
m_fileStream = new FileStream(m_fileName, FileMode.Open, m_fileAccessMode, FileShare.ReadWrite);
m_fat = new ArchiveFileAllocationTable(this);
break;
}
catch
{
if (attempts >= 4)
throw;
Thread.Sleep(500);
}
}
}
else if (m_fileAccessMode == FileAccess.Read)
{
// File does not exist, so we create a placeholder file in the temp directory
m_fileStream = new FileStream(Path.GetTempFileName(), FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
m_fat = new ArchiveFileAllocationTable(this);
m_fat.FileStartTime = TimeTag.MaxValue;
m_fat.FileEndTime = TimeTag.MaxValue;
// Manually call file monitoring event if file watchers are not enabled
if (!m_monitorNewArchiveFiles)
FileWatcher_Created(this, new FileSystemEventArgs(WatcherChangeTypes.Created, FilePath.GetAbsolutePath(m_fileName), FilePath.GetFileName(m_fileName)));
}
else
{
// File does not exist, so we have to create it and initialize it.
m_fileStream = new FileStream(m_fileName, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
m_fat = new ArchiveFileAllocationTable(this);
m_fat.Save(true);
// Manually call file monitoring event if file watchers are not enabled
if (!m_monitorNewArchiveFiles)
FileWatcher_Created(this, new FileSystemEventArgs(WatcherChangeTypes.Created, FilePath.GetAbsolutePath(m_fileName), FilePath.GetFileName(m_fileName)));
}
}
