public static async Task <CachedContent <T> > GetItemsAsync <T>(string key)
{
string json = null;
if (_memoryCache.ContainsKey(key))
{
json = _memoryCache[key];
}
else
{
json = await UserStorage.ReadTextFromFile(key);
_memoryCache[key] = json;
}
if (!String.IsNullOrEmpty(json))
{
try
{
CachedContent <T> records = JsonConvert.DeserializeObject <CachedContent <T> >(json);
return(records);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
}
return(null);
}
public static async Task AddItemsAsync <T>(string key, CachedContent <T> data, bool useStorageCache)
{
try
{
string json = JsonConvert.SerializeObject(data);
if (useStorageCache)
{
await UserStorage.WriteText(key, json);
}
if (_memoryCache.ContainsKey(key))
{
_memoryCache[key] = json;
}
else
{
_memoryCache.Add(key, json);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
}
private static bool DataNeedToBeUpdated <T>(CachedContent <T> dataInCache, TimeSpan expiration)
{
return(dataInCache == null || (DateTime.Now - dataInCache.Timestamp > expiration));
}
public static async Task AddItemsAsync <T>(string key, CachedContent <T> data)
{
await AddItemsAsync <T>(key, data, true);
}