/// <summary>
/// Releases all the resources used by the <see cref="TransactionalFileStructure"/> object.
/// </summary>
public void Dispose()
{
if (!m_disposed)
{
try
{
if (m_currentTransaction != null)
{
m_currentTransaction.Dispose();
m_currentTransaction = null;
}
if (m_diskIo != null)
{
m_diskIo.Dispose();
m_diskIo = null;
}
}
finally
{
GC.SuppressFinalize(this);
m_disposed = true; // Prevent duplicate dispose.
}
}
}
/// <summary>
/// This will start a transactional edit on the file.
/// </summary>
/// <returns></returns>
public TransactionalEdit BeginEdit()
{
if (m_diskIo.IsReadOnly)
{
throw new Exception("File has been opened in readonly mode");
}
TransactionalEdit transaction = new TransactionalEdit(m_diskIo, OnTransactionRolledBack, OnTransactionCommitted);
Interlocked.CompareExchange(ref m_currentTransaction, transaction, null);
if (m_currentTransaction != transaction)
{
throw new Exception("Only one edit transaction can exist at one time.");
}
return(m_currentTransaction);
}
private void OnTransactionRolledBack()
{
m_currentTransaction = null;
}
private void OnTransactionCommitted()
{
m_currentReadTransaction = new ReadSnapshot(m_diskIo);
Thread.MemoryBarrier();
m_currentTransaction = null;
}