public async Task <TemporaryReadResult <TKey, TEntry> > ReadAsync(int count)
{
await _sem.WaitAsync().ConfigureAwait(false);
try
{
int read = 0;
Dictionary <string, Serie <TKey, TEntry> > series = new Dictionary <string, Serie <TKey, TEntry> >();
List <FileModificationRef> modifications = new List <FileModificationRef>();
foreach (var fi in _directory.EnumerateFiles("*.dat"))
{
using (var fs = fi.Open(FileMode.Open, FileAccess.Read))
using (var reader = new BinaryReader(fs, Encoding.ASCII, true))
{
while (reader.PeekChar() != -1 && read < count)
{
var entry = new TEntry();
var id = reader.ReadString();
Serie <TKey, TEntry> serie;
if (!series.TryGetValue(id, out serie))
{
var key = await _keyConverter.ConvertAsync(id).ConfigureAwait(false);
serie = new Serie <TKey, TEntry>(key);
series.Add(id, serie);
}
var timestamp = new DateTime(reader.ReadInt64(), DateTimeKind.Utc);
entry.SetTimestamp(timestamp);
entry.Read(reader);
serie.Entries.Add(entry);
read++;
}
// add the file
var reference = new FileModificationRef(fi, fs.Length, fs.Position);
modifications.Add(reference);
if (read == count)
{
break;
}
}
}
return(new TemporaryReadResult <TKey, TEntry>(series.Values.ToList(), () => DeleteAsync(modifications)));
}
finally
{
_sem.Release();
}
}
public static async Task <Serie <TKey, TEntry> > Deserialize <TKey, TEntry>(byte[] bytes, IKeyConverter <TKey> keyConverter)
where TEntry : IRedisEntry, new()
{
var stream = new MemoryStream(bytes);
var reader = CreateReader(stream);
var id = reader.ReadString();
var key = await keyConverter.ConvertAsync(id).ConfigureAwait(false);
var serie = new Serie <TKey, TEntry>(key);
while (stream.Length != stream.Position)
{
var entry = DeserializeEntry <TKey, TEntry>(reader);
serie.Entries.Add(entry);
}
return(serie);
}
