private async Task LoadLocallyAsync(string key, Stream sink, ICacheControl cacheControl, CancellationToken ct)
{
async Task func(string cachekey, Stream factorySink, ICacheControl factoryCacheControl)
{
try
{
Stats.TraceLocalLoads(_groupName);
await _getter.GetAsync(cachekey, factorySink, factoryCacheControl, ct).ConfigureAwait(false);
}
catch (Exception ex)
{
Logger.Error(ex, String.Format("Call to LoadLocally for Cache {0} key: {1} failed ", _groupName, key));
throw;
}
}
Stats.TraceCacheHits(_groupName);
var cacheEntry = await _localCache.GetOrAddAsync(key, func, cacheControl, ct).ConfigureAwait(false);
try
{
Stream cacheEntryStream = cacheEntry.Value();
await cacheEntryStream.CopyToAsync(sink).ConfigureAwait(false);
}
finally
{
await cacheEntry.DisposeAsync().ConfigureAwait(false);
}
}
public async Task GetAsync(string key, Stream sink, ICacheControl cacheControl, CancellationToken ct)
{
Interlocked.Increment(ref callCount);
try
{
long number = long.Parse(key);
long result;
if (number == 0)
{
result = 0;
}
else if (number == 1)
{
result = 1;
}
else
{
// Make to call to n-1 and n-2 in parallel
using (var firstStream = new MemoryStream())
using (var secondStream = new MemoryStream())
{
await getter.GetAsync((number - 1).ToString(), firstStream, new CacheControl(), CancellationToken.None).ConfigureAwait(false);
await getter.GetAsync((number - 2).ToString(), secondStream, new CacheControl(), CancellationToken.None).ConfigureAwait(false);
var firstStr = firstStream.StreamToString();
var secondStr = secondStream.StreamToString();
// return the sum
var firstLong = long.Parse(firstStr);
var secondLong = long.Parse(secondStr);
result = firstLong + secondLong;
}
}
var resultStream = result.ToString().StringToStream();
resultStream.Position = 0;
await resultStream.CopyToAsync(sink);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
throw;
}
}