static void SingleTest()
{
var clock = new Stopwatch();
var path = Path.GetFullPath("test.db");
try
{
var buf = new byte[sizeof(long)];
TransactionId tx;
tmpbuf = Encoding.ASCII.GetBytes(TXT);
using (var fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.ReadWrite, 4 * 4096, false))
{
// log header
fs.Write(buf, 0, sizeof(int));
fs.Write(buf, 0, sizeof(int));
fs.Write(buf, 0, sizeof(int));
fs.Write(buf, 0, sizeof(int));
fs.Write(buf, 0, sizeof(int));
fs.Write(buf, 0, sizeof(int));
clock.Start();
for (int i = 0; i < 3 * ITER; ++i)
{
// begin FileLog.Append
Monitor.Enter(fs);
tx = log.First;
var file = new BoundedStream(fs, fs.Length, int.MaxValue);
try
{
var start = file.Position;
// end FileLog.Append
file.Write(tmpbuf, 0, tmpbuf.Length);
// begin FileLog.Append.Dispose
var length = file.Length - start;
if (length > 0)
{
if (file.Position != file.Length)
file.Seek(0, SeekOrigin.End);
buf.Write(length);
file.Write(buf, 0, sizeof(int));
file.Flush();
var pos = file.Position;
file.Seek(16, SeekOrigin.Begin);
buf.Write(pos);
file.Write(buf, 0, sizeof(long));
file.Flush();
file.Seek(0, SeekOrigin.End);
}
}
finally
{
Monitor.Exit(fs);
}
//end FileLog.Appender.Dispose
}
clock.Stop();
Console.WriteLine("Single size: {0} kB", fs.Length);
}
PrintStats("Single", clock.ElapsedMilliseconds);
}
finally
{
File.Delete(path);
}
}
/// <summary>
/// Atomically append data to the durable store.
/// </summary>
/// <param name="transaction">The transaction being written.</param>
/// <param name="transaction">The transaction being written.</param>
/// <returns>A stream for writing.</returns>
/// <remarks>
/// The <paramref name="async"/> parameter is largely optional, in that it's safe to simply
/// provide 'false' and everything will still work.
/// </remarks>
public IDisposable Append(out Stream output, out TransactionId transaction)
{
var x = writer;
if (x == null) throw new ObjectDisposedException(string.Format("FileLog ({0}) has been disposed.", path));
Monitor.Enter(x);
if (writer == null) throw new ObjectDisposedException(string.Format("FileLog ({0}) has been disposed.", path));
transaction = new TransactionId(next, path);
x.Seek(next, SeekOrigin.Begin);
output = new BoundedStream(x, next, int.MaxValue);
return new Appender(this, writeBuffer);
}