public void CommitTransaction(ICollection <PersistentQueueOperation> operations)
{
if (operations.Count == 0)
{
return;
}
byte[] transactionBuffer = GenerateTransactionBuffer(operations);
lock (_transactionLogLock)
{
long txLogSize;
using (FileStream stream = WaitForTransactionLog(transactionBuffer))
{
stream.Write(transactionBuffer, 0, transactionBuffer.Length);
txLogSize = stream.Position;
stream.Flush();
}
ApplyTransactionOperations(operations);
TrimTransactionLogIfNeeded(txLogSize);
PersistentQueueUtils.Write(Meta, stream =>
{
byte[] bytes = BitConverter.GetBytes(CurrentFileNumber);
stream.Write(bytes, 0, bytes.Length);
bytes = BitConverter.GetBytes(CurrentFilePosition);
stream.Write(bytes, 0, bytes.Length);
});
FlushTrimmedTransactionLog();
}
}
private void FlushTrimmedTransactionLog()
{
byte[] transactionBuffer;
using (MemoryStream ms = new MemoryStream())
{
ms.Write(PersistentQueueUtils.StartTransactionSeparator, 0, PersistentQueueUtils.StartTransactionSeparator.Length);
byte[] count = BitConverter.GetBytes(CurrentCountOfItemsInQueue);
ms.Write(count, 0, count.Length);
PersistentQueueEntry[] checkedOut;
lock (_checkedOutEntries)
{
checkedOut = _checkedOutEntries.ToArray();
}
foreach (var entry in checkedOut)
{
WriteEntryToTransactionLog(ms, entry, PersistentQueueOperationTypes.ENQUEUE);
}
PersistentQueueEntry[] listedEntries;
lock (_entries)
{
listedEntries = _entries.ToArray();
}
foreach (var entry in listedEntries)
{
// TODO Use Jobs here
WriteEntryToTransactionLog(ms, entry, PersistentQueueOperationTypes.ENQUEUE);
}
ms.Write(PersistentQueueUtils.EndTransactionSeparator, 0, PersistentQueueUtils.EndTransactionSeparator.Length);
ms.Flush();
transactionBuffer = ms.ToArray();
}
PersistentQueueUtils.Write(TransactionLog, stream =>
{
stream.SetLength(transactionBuffer.Length);
stream.Write(transactionBuffer, 0, transactionBuffer.Length);
});
}