public IObservable <ICommit> GetFrom(string checkpointToken = null)
{
ThrowWhenDisposed();
Logger.Debug(Messages.GettingAllCommitsFromCheckpoint, checkpointToken);
GetEventStoreCheckpoint checkpoint = GetEventStoreCheckpoint.Parse(checkpointToken);
var reader = new EventReader(_connection, _serializer);
return(reader.ReadAllFromCheckpoint(checkpoint));
}