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());
}
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);
}
