private async Task EnsureFeed()
{
if (_feed == null)
{
_feed = await GetOrCreateFeedCacheAsync();
}
}
private async Task <MeetupFeed> GetOrCreateFeedCacheAsync()
{
MeetupFeed result = null;
if (!_cache.TryGetValue <MeetupFeed>(_config.CacheKey, out result))
{
result = await GetFeedInternal();
if (result != null)
{
_cache.Set(
_config.CacheKey,
result,
TimeSpan.FromHours(_config.CacheDurationInSeconds));
}
}
if (result == null)
{
throw new InvalidOperationException("failed to retrieve meetup feed");
}
return(result);
}
private async Task <MeetupFeed> GetFeedInternal()
{
var url = string.Format(_config.FeedFormat, _config.NumberToGet, _config.ExpiryDays);
var http = _httpClientFactory.CreateClient();
var jsonString = await http.GetStringAsync(url).ConfigureAwait(false);
var list = JsonConvert.DeserializeObject <List <MeetupEvent> >(jsonString);
var feed = new MeetupFeed();
feed.Events = list;
return(feed);
}
private async Task <MeetupFeed> GetFeedInternal()
{
var url = string.Format(_config.FeedFormat);
var http = _httpClientFactory.CreateClient();
var jsonString = await http.GetStringAsync(url).ConfigureAwait(false);
var data = JsonConvert.DeserializeObject <MeetupEventData>(jsonString);
var feed = new MeetupFeed();
if (data != null)
{
feed.Events = data.Results;
}
return(feed);
}