/// <summary>
/// Writes an <see cref="IOperation" /> to the log.
/// </summary>
/// <param name="resource">The parent <see cref="ITransactedResource" /> responsible for serializing the operation.</param>
/// <param name="operation">The operation to be written.</param>
/// <remarks>
/// <note>
/// This property can only be called if the operation log is in <see cref="OperationLogMode.Undo" />
/// mode.
/// </note>
/// </remarks>
/// <exception cref="TransactionException">Thrown if the log isn't open or if the mode isn't <see cref="OperationLogMode.Undo" />.</exception>
public void Write(ITransactedResource resource, IOperation operation)
{
long cbPos;
long cb;
using (TimedLock.Lock(this))
{
if (file == null)
{
throw new TransactionException(ClosedMsg);
}
if (mode != OperationLogMode.Undo)
{
throw new TransactionException("Write is available only when the log is in UNDO mode.");
}
file.WriteInt32(Magic); // Magic number
cbPos = file.Position; // Length place holder
file.WriteInt32(0);
file.WriteString32(operation.Description); // Description
resource.WriteOperation(file, operation); // Serialized operation
cb = file.Position - cbPos - 4;
if (cb < 0 || cb > int.MaxValue)
{
throw new TransactionException("ITransactedResource.WriteOperation() returned with an unexpected stream position.");
}
file.Position = cbPos;
file.WriteInt32((int)cb);
file.Position = file.Length;
file.Flush();
}
}
/// <summary>
/// Writes the index file.
/// </summary>
/// <param name="path">The target file path.</param>
/// <param name="phrases">The phrases to be written.</param>
private void SaveIndexTo(string path, Phrase[] phrases)
{
using (var fs = new EnhancedFileStream(path, FileMode.Create))
{
fs.WriteInt32(Magic);
fs.WriteInt32(phrases.Length);
foreach (var phrase in phrases)
{
fs.WriteString16(phrase.PhraseType.ToString());
fs.WriteString32(phrase.Text);
fs.WriteString16(phrase.Voice);
fs.WriteString16(phrase.ActualVoice);
fs.WriteString16(phrase.Encoding.ToString());
fs.WriteString16(phrase.SampleRate.ToString());
fs.WriteInt64(phrase.LastAccessUtc.Ticks);
fs.WriteString16(phrase.Path);
}
}
}