/// <summary>
/// Get a master key from the cache. If it is missing, re-populate the cache with the provided source
/// </summary>
public static async Task <T> GetOrLoadAsync <T>(this IRedisExpirableStore <T> cache, string key,
Func <Task <T[]> > getAllItems)
{
var cachedItem = await cache.GetAsync(key);
if (!Equals(cachedItem, default(T)))
{
return(cachedItem);
}
var allItems = (await getAllItems()).ToArray();
await cache.SetAsync(allItems);
return(allItems.FirstOrDefault(item => key.Equals(cache.ExtractMasterKey(item))));
}
/// <summary>
/// Get some master keys from the cache. If any of them is missing, re-populate the cache with the provided source
/// </summary>
public static async Task <IEnumerable <T> > GetOrLoadAsync <T>(this IRedisExpirableStore <T> cache,
IEnumerable <string> keys, Func <Task <T[]> > getAllItems)
{
var expectedKeys = keys.ToArray();
var cachedItems = await cache.GetAsync(expectedKeys);
if (cachedItems.Length == expectedKeys.Length)
{
return(cachedItems);
}
// some values are missing in the cache, repopulate with all items
var allItems = (await getAllItems()).ToArray();
await cache.SetAsync(allItems);
return(allItems.Where(item => expectedKeys.Contains(cache.ExtractMasterKey(item))));
}