public void Compact()
{
var newPositions = new Dictionary <string, StreamInformation>(StringComparer.InvariantCultureIgnoreCase);
var newFilePath = dataPath + ".compacting";
streamSource.DeleteIfExists(newFilePath);
using (var newFile = streamSource.OpenReadWrite(newFilePath))
using (var newWriter = new BinaryWriter(newFile))
using (var current = streamSource.OpenRead(dataPath))
using (var reader = new BinaryReader(current))
{
while (true)
{
PersistedEvent persistedEvent;
try
{
persistedEvent = ReadPersistedEvent(reader);
}
catch (EndOfStreamException)
{
break;
}
StreamInformation value;
if (idToPos.TryGetValue(persistedEvent.Id, out value) == false)
{
continue;
}
if (value.LastPosition == Deleted || value.LastPosition == DoesNotExists)
{
continue;
}
StreamInformation information;
if (newPositions.TryGetValue(persistedEvent.Id, out information) == false)
{
information = new StreamInformation
{
LastPosition = DoesNotExists,
StreamLength = 0
};
}
persistedEvent.Previous = information.LastPosition;
newPositions[persistedEvent.Id] = new StreamInformation
{
LastPosition = newFile.Position,
StreamLength = persistedEvent.StreamLength
};
WriteItem(persistedEvent, newWriter);
}
streamSource.Flush(newFile);
compactionLock.EnterWriteLock();
try
{
newFile.Close();
streamSource.DeleteOnClose(dataPath);
Stream result;
while (cachedReadStreams.TryDequeue(out result))
{
result.Dispose();
}
binaryWriter.Dispose();
file.Dispose();
streamSource.RenameToLatest(newFilePath, dataPath);
file = streamSource.OpenReadWrite(dataPath);
binaryWriter = new BinaryWriter(file, Encoding.UTF8, leaveOpen: true);
streamSource.DeleteIfExists("data.offsets");
FlushOffsets();
idToPos.Clear();
foreach (var val in newPositions)
{
idToPos[val.Key] = val.Value;
}
}
finally
{
compactionLock.ExitWriteLock();
}
}
}