/// <summary>
/// Reads data from the disk
/// </summary>
/// <param name="position">The starting position</param>
/// <param name="buffer">the byte buffer of data to read</param>
/// <param name="length">the number of bytes to read</param>
/// <returns>the number of bytes read</returns>
public int ReadRaw(long position, byte[] buffer, int length)
{
bool needsOpen = m_stream is null;
try
{
if (needsOpen)
{
Open();
}
int totalLengthRead = 0;
int len = 0;
while (length > 0)
{
using (m_isUsingStream.EnterReadLock())
{
Task <int> results;
lock (m_syncRoot)
{
m_stream.Position = position;
results = m_stream.ReadAsync(buffer, 0, length);
}
len = results.Result;
}
totalLengthRead += len;
if (len == length)
{
return(totalLengthRead);
}
if (len == 0 && position >= m_length)
{
return(totalLengthRead); //End of the stream has occurred
}
if (len != 0)
{
position += len;
length -= len; //Keep Reading
}
else
{
Log.Publish(MessageLevel.Warning, "File Read Error", $"The OS has closed the following file {m_stream.Name}. Attempting to reopen.");
ReopenFile();
}
}
return(length);
}
finally
{
if (needsOpen)
{
Close();
}
}
}
/// <summary>
/// Reads data from the disk
/// </summary>
/// <param name="position">The starting position</param>
/// <param name="buffer">the byte buffer of data to read</param>
/// <param name="length">the number of bytes to read</param>
/// <returns>the number of bytes read</returns>
public int ReadRaw(long position, byte[] buffer, int length)
{
using (m_isUsingStream.EnterReadLock())
{
Task <int> results;
lock (m_syncRoot)
{
m_stream.Position = position;
results = m_stream.ReadAsync(buffer, 0, length);
}
return(results.Result);
}
}
/// <summary>
/// Creates a new <see cref="SortedTreeTable{TKey,TValue}"/> based on the settings passed to this class.
/// Once created, it is up to he caller to make sure that this class is properly disposed of.
/// </summary>
/// <param name="estimatedSize">The estimated size of the file. -1 to ignore this feature and write to the first available directory.</param>
/// <returns></returns>
public SortedTreeTable <TKey, TValue> CreateArchiveFile(long estimatedSize = -1)
{
using (m_lock.EnterReadLock())
{
if (m_settings.IsMemoryArchive)
{
SortedTreeFile af = SortedTreeFile.CreateInMemory(blockSize: 4096, flags: m_settings.Flags.ToArray());
return(af.OpenOrCreateTable <TKey, TValue>(m_settings.EncodingMethod));
}
else
{
string fileName = CreateArchiveName(GetPathWithEnoughSpace(estimatedSize));
SortedTreeFile af = SortedTreeFile.CreateFile(fileName, blockSize: 4096, flags: m_settings.Flags.ToArray());
return(af.OpenOrCreateTable <TKey, TValue>(m_settings.EncodingMethod));
}
}
}