/// <summary>
/// Used to retrieve a class that inherits from CacheIndex
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="requestUrl"></param>
/// <param name="collectionIdentifier"></param>
/// <returns>First it tries to get a index from memoryCache, then from fileCache and after that returns null, if no index is found</returns>
public static async Task <T> retrieve <T>(string requestUrl, IonConfig config) where T : CacheIndex
{
T index = MemoryCacheIndex.get <T>(requestUrl, config.collectionIdentifier);
if (index != null)
{
IonLogging.log("Index lookup " + requestUrl + " from memory", IonLogMessageTypes.SUCCESS);
return(index);
}
// check isolated storage
try
{
index = await StorageUtils.getIndexAsync <T>(requestUrl, config).ConfigureAwait(false);
if (index != null)
{
IonLogging.log("Index lookup " + requestUrl + " from isolated storage", IonLogMessageTypes.SUCCESS);
}
}
catch (Exception e)
{
IonLogging.log("Index lookup " + requestUrl + " is not in isolated storage. Message: " + e.Message, IonLogMessageTypes.INFORMATION);
}
// Save to memory cache, if index is not null
if (index != null)
{
MemoryCacheIndex.put(requestUrl, config.collectionIdentifier, index);
}
return(index);
}
/// <summary>
/// Saves a index to memory and isolated storage cache
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="requestURL"></param>
/// <param name="cacheIndex"></param>
/// <param name="config"></param>
public static async Task save <T>(string requestURL, T cacheIndex, IonConfig config) where T : CacheIndex
{
try
{
// save to memory cache
MemoryCacheIndex.put <T>(requestURL, config.collectionIdentifier, cacheIndex);
// save to isolated storage
await StorageUtils.saveIndexAsync(requestURL, cacheIndex, config).ConfigureAwait(false);
}
catch (Exception e)
{
IonLogging.log("Cache Index " + requestURL + " could not be saved. Message: " + e.Message, IonLogMessageTypes.ERROR);
}
}