// [ResponseCache(Location = ResponseCacheLocation.Any, Duration = 10)]
public async Task <IEnumerable <WeatherForecast> > Get()
{
var weatherForecast = await _weatherApiClient.GetWeatherForecast();
_logger.LogInformation("Loaded {Count} items", weatherForecast.Count);
return(weatherForecast);
}
public async Task <IEnumerable <WeatherForecast> > Get()
{
const string cacheKey = "getWeatherForecast";
var weatherForecastBytes = await _cache.GetAsync(cacheKey);
if (weatherForecastBytes != null)
{
_logger.LogInformation("Return result from cache");
return(JsonSerializer.Deserialize <List <WeatherForecast> >(weatherForecastBytes));
}
var weatherForecast = await _weatherApiClient.GetWeatherForecast();
var cacheExpirationOptions = new DistributedCacheEntryOptions
{
AbsoluteExpiration = DateTime.Now.AddSeconds(10),
};
weatherForecastBytes = JsonSerializer.SerializeToUtf8Bytes(weatherForecast);
await _cache.SetAsync(cacheKey, weatherForecastBytes, cacheExpirationOptions);
_logger.LogInformation("Loaded {Count} items", weatherForecast.Count);
return(weatherForecast);
}
private async Task <List <WeatherForecast> > PopulateCache()
{
var weatherForecast = await _weatherApiClient.GetWeatherForecast();
_logger.LogInformation("Loaded {Count} items", weatherForecast.Count);
return(weatherForecast);
}
public void UpdateWeather(string city)
{
string url = String.Format("http://api.openweathermap.org/data/2.5/forecast/daily?q={0}&cnt={1}&units=metric&mode=json&APPID={2}", city, CNT, WeatherApiClient.GetAPIKey());
Task <RootObject> t = Task.Run(() => WeatherApiClient.GetWeatherForecast(url));
t.Wait();
RootObject r = t.Result;
if (r != null)
{
WeatherList = new ObservableCollection <DayElem>(r.list);
SelectedDay = WeatherList[0];
Root = r;
}
}
public async Task <IEnumerable <WeatherForecast> > Get()
{
// Используем Microsoft.Extensions.Caching.Memory
const string cacheKey = "getWeatherForecast";
if (_cache.TryGetValue(cacheKey, out List <WeatherForecast> weatherForecast))
{
_logger.LogInformation("Return result from cache");
return(weatherForecast);
}
await _semaphore.WaitAsync();
try
{
// double check locking
if (_cache.TryGetValue(cacheKey, out weatherForecast))
{
_logger.LogInformation("Return result from cache (inside the lock)");
return(weatherForecast);
}
weatherForecast = await _weatherApiClient.GetWeatherForecast();
var cacheEntryOptions = new MemoryCacheEntryOptions
{
AbsoluteExpiration = DateTime.Now.AddSeconds(100),
Priority = CacheItemPriority.Normal,
};
_cache.Set(cacheKey, weatherForecast, cacheEntryOptions);
_logger.LogInformation("Loaded {Count} items", weatherForecast.Count);
return(weatherForecast);
}
finally
{
_semaphore.Release();
}
}
