private void FlushTrimmedTransactionLog()
{
byte[] transactionBuffer;
using (var ms = new MemoryStream())
{
ms.Write(Constants.StartTransactionSeparator, 0, Constants.StartTransactionSeparator.Length);
var count = BitConverter.GetBytes(EstimatedCountOfItemsInQueue);
ms.Write(count, 0, count.Length);
var checkedOut = checkedOutEntries.ToArray();
foreach (var entry in checkedOut)
{
WriteEntryToTransactionLog(ms, entry, OperationType.Enqueue);
}
var listedEntries = entries.ToArray();
foreach (var entry in listedEntries)
{
WriteEntryToTransactionLog(ms, entry, OperationType.Enqueue);
}
ms.Write(Constants.EndTransactionSeparator, 0, Constants.EndTransactionSeparator.Length);
ms.Flush();
transactionBuffer = ms.ToArray();
}
Atomic.Write(TransactionLog, stream =>
{
stream.SetLength(transactionBuffer.Length);
stream.Write(transactionBuffer, 0, transactionBuffer.Length);
});
}
public void CommitTransaction(ICollection <Operation> operations)
{
if (operations.Count == 0)
{
return;
}
byte[] transactionBuffer = GenerateTransactionBuffer(operations);
lock (transactionLogLock)
{
long txLogSize;
using (var stream = WaitForTransactionLog(transactionBuffer))
{
stream.Write(transactionBuffer, 0, transactionBuffer.Length);
txLogSize = stream.Position;
stream.Flush();
}
ApplyTransactionOperations(operations);
TrimTransactionLogIfNeeded(txLogSize);
Atomic.Write(Meta, stream =>
{
var bytes = BitConverter.GetBytes(CurrentFileNumber);
stream.Write(bytes, 0, bytes.Length);
bytes = BitConverter.GetBytes(CurrentFilePosition);
stream.Write(bytes, 0, bytes.Length);
});
if (ParanoidFlushing)
{
FlushTrimmedTransactionLog();
}
}
}