private static async Task <(bool success, ChunkMap map)> CreateNewElementAsync(IMongoCollection <ChunkMap> maps,
string id, NamedReaderWriterLock nrwl)
{
var map = new ChunkMap {
ID = id, ChunksIDs = new List <string>(), Length = 0
};
var lId = await nrwl.AcquireReaderLockAsync($"{nameof(ChunkMap)}.{id}");
using var session = await maps.Database.Client.StartSessionAsync();
session.StartTransaction();
try
{
if (id != null)
{
if (!await(await maps.FindAsync(x => x.ID == id)).AnyAsync())
{
map.ID = id;
}
else
{
await nrwl.ReleaseLockAsync($"{nameof(ChunkMap)}.{id}", lId);
return(false, null);
}
}
await maps.InsertOneAsync(map);
await session.CommitTransactionAsync();
await nrwl.ReleaseLockAsync($"{nameof(ChunkMap)}.{id}", lId);
return(true, map);
}
catch (Exception)
{
await nrwl.ReleaseLockAsync($"{nameof(ChunkMap)}.{id}", lId);
}
await session.AbortTransactionAsync();
await nrwl.ReleaseLockAsync($"{nameof(ChunkMap)}.{id}", lId);
return(false, null);
}
internal async Task <string> DuplicateAsync(string id)
{
var lId2 = await _nrwl.AcquireWriterLockAsync($"{nameof(ChunkMap)}.{id}");
var mapSearch = (await _maps.FindAsync(x => x.ID == id)).ToList();
if (!mapSearch.Any())
{
await _nrwl.ReleaseLockAsync($"{nameof(ChunkMap)}.{id}", lId2);
throw new MdbfsElementNotFoundException();
} //not found
var map = mapSearch.First();
var nMap = new ChunkMap {
ChunksIDs = new List <string>(), Length = map.Length, Removed = false
};
var chunksSearch = await _chunks.FindAsync(Builders <Chunk> .Filter.Where(x => map.ChunksIDs.Contains(x.ID)));
var nChunks = new List <Chunk>();
foreach (var ch in chunksSearch.ToEnumerable())
{
nChunks.Add(new Chunk {
Bytes = ch.Bytes
});
}
await _chunks.InsertManyAsync(nChunks);
nChunks.ForEach(x => nMap.ChunksIDs.Add(x.ID));
await _maps.InsertOneAsync(nMap);
await _nrwl.ReleaseLockAsync($"{nameof(ChunkMap)}.{id}", lId2);
return(nMap.ID);
}
public async Task <Element> GetAsync(string id)
{
var lId = await _nrwl.AcquireReaderLockAsync($"{nameof(Files)}.{id}");
var elemSearch = (await _elements.FindAsync(x => x.ID == id)).ToList();
await _nrwl.ReleaseLockAsync($"{nameof(Files)}.{id}", lId);
return(elemSearch.Count == 0 ? null : elemSearch.First());
}