public void Dispose()
{
if (mWriteAheadLogWriter != null)
{
mWriteAheadLogWriter.Dispose();
mWriteAheadLogWriter = null;
}
}
public void CreateSnapshot(string snapshotPath)
{
if (File.Exists(snapshotPath))
{
throw new ArgumentException(string.Format("Snapshot file already exists: {0}", snapshotPath));
}
using (var writer = new WriteAheadLogWriter(snapshotPath))
{
foreach (var kv in mDictionary)
{
writer.Append((byte)WriteAheadLogType.Add, Encoding.UTF8.GetBytes(kv.Key), kv.Value);
}
}
}
public PersistentDictionary(string snapshotPath)
{
SnapshotPath = snapshotPath;
if (File.Exists(TempSnapshotPath) && !File.Exists(SnapshotPath))
{
File.Move(TempSnapshotPath, SnapshotPath);
}
mDictionary = LoadSnapshot(SnapshotPath);
mWriteAheadLogWriter = new WriteAheadLogWriter(SnapshotPath);
if (mWriteAheadLogWriter.Length > 0)
{
CheckPoint();
}
}
public void CheckPoint()
{
if (File.Exists(TempSnapshotPath))
{
File.Delete(TempSnapshotPath);
}
CreateSnapshot(TempSnapshotPath);
mWriteAheadLogWriter.Dispose();
File.Delete(SnapshotPath);
File.Move(TempSnapshotPath, SnapshotPath);
mWriteAheadLogWriter = new WriteAheadLogWriter(SnapshotPath);
}
