public async Task <TItem> ReadAsync(IDatabaseAsync redisDatabase, TKey key, TimeSpan?resetExpiry)
{
var headerKey = _keygen.GetKey(key);
var chunkGets = new List <Task <RedisValue> >();
using (var redisLock = _lockFactory.GetLockInstance(headerKey))
{
await redisLock.AcquireAsync().ConfigureAwait(false);
var header = await GetAndUpdateExpiry(redisDatabase, headerKey, resetExpiry).ConfigureAwait(false);
if (header.IsNullOrEmpty)
{
return(default(TItem));
}
var totalChunks = (int)header;
for (var chunkIndex = 0; chunkIndex < totalChunks; chunkIndex++)
{
var chunkKey = _keygen.GetKey(key, chunkIndex.ToString());
chunkGets.Add(GetAndUpdateExpiry(redisDatabase, chunkKey, resetExpiry));
}
await Task.WhenAll(chunkGets).ConfigureAwait(false);
}
var jsonData = string.Join("", chunkGets.Select(cg => cg.Result));
return(string.IsNullOrEmpty(jsonData) ? default(TItem) : JsonConvert.DeserializeObject <TItem>(jsonData));
}
public async Task <bool> DeleteAsync(IDatabaseAsync redisDatabase, TKey key)
{
var headerKey = _keygen.GetKey(key);
var chunkDeletes = new List <Task <bool> >();
using (var redisLock = _lockFactory.GetLockInstance(headerKey))
{
await redisLock.AcquireAsync().ConfigureAwait(false);
var header = await redisDatabase.StringGetAsync(headerKey).ConfigureAwait(false);
if (header.IsNullOrEmpty)
{
return(false);
}
var chunkCount = (int)header;
for (var chunkIndex = 0; chunkIndex < chunkCount; chunkIndex++)
{
var chunkKey = _keygen.GetKey(key, chunkIndex.ToString());
chunkDeletes.Add(redisDatabase.KeyDeleteAsync(chunkKey));
}
await Task.WhenAll(chunkDeletes).ConfigureAwait(false);
return(await redisDatabase.KeyDeleteAsync(headerKey).ConfigureAwait(false));
}
}
public async Task <bool> WriteAsync(IDatabaseAsync redisDatabase, TKey key, TItem item, TimeSpan?expiry)
{
var headerKey = _keygen.GetKey(key);
var chunkIndex = 0;
Task <bool> previousWriteTask = null;
using (var redisLock = _lockFactory.GetLockInstance(headerKey))
{
await redisLock.AcquireAsync().ConfigureAwait(false);
using (var bufferedWriter = new BufferedTextWriter(_chunkSize))
{
bufferedWriter.BufferFull += async(s, e) =>
{
var bufferContent = e.Buffer.ToString();
var myChunkIndex = chunkIndex++;
e.Buffer.Clear();
if (previousWriteTask != null)
{
await previousWriteTask.ConfigureAwait(false);
}
previousWriteTask = WriteToRedisAsync(redisDatabase, key, expiry, bufferContent, myChunkIndex);
};
JsonSerializer.CreateDefault().Serialize(bufferedWriter, item);
if (bufferedWriter.Buffer.Length > 0)
{
if (previousWriteTask != null)
{
await previousWriteTask.ConfigureAwait(false);
previousWriteTask = null;
}
await WriteToRedisAsync(redisDatabase, key, expiry, bufferedWriter.Buffer.ToString(), chunkIndex ++).ConfigureAwait(false);
}
}
return(await redisDatabase.StringSetAsync(headerKey, chunkIndex, expiry).ConfigureAwait(false));
}
}