public CacheManager(IRandomAwaiter randomAwaiter, ICacheKeeper cacheKeeper)
{
DefaultPicture = new NewPicture(ConfigurationManager.AppSettings["DefaultImage"]);
_randomAwaiter = randomAwaiter;
_cacheKeeper = cacheKeeper;
}
public Task <NewPicture> GeneratePicture(string uri)
{
if (_cacheKeeper.AllCache.Any(x => x.Key == GetFileSize(uri)))
{
return(ReturnAlreadyGenerated(uri));
}
var key = GetFileSize(uri);
CancellationTokenSource cts = new CancellationTokenSource();
var task = Task.Factory.StartNew <NewPicture>
(
((obj) =>
{
_randomAwaiter.ThreadSleep();
var newPicture = new NewPicture(obj.ToString());
return(newPicture);
}),
uri,
cts.Token
);
return(Task.Factory.StartNew <NewPicture>(() =>
{
if (Task.WaitAll(new[] { task }, TimeSpan.FromSeconds(_cacheKeeper.MaxDownloadingTIme)))
{
var resultPicture = task.Result;
_cacheKeeper.AllCache.Add(new KeyValuePair <long, NewPicture>(key, resultPicture));
}
else
{
cts.Cancel();
_cacheKeeper.AllCache.Add(new KeyValuePair <long, NewPicture>(key, DefaultPicture));
}
if (_cacheKeeper.AllCache.Count > _cacheKeeper.MaxCapacity)
{
_cacheKeeper.AllCache.RemoveAt(0);
}
return _cacheKeeper.AllCache.Last().Value;
}));
}