private static string GetCacheKey <T>(Tag.Name tag, T returnType, object parameters = null)
{
string _tag = tag.ToString();
string returnTypeName = typeof(T).AssemblyQualifiedName;
string _parameters = string.Empty;
if (parameters != null)
{
_parameters = Newtonsoft.Json.JsonConvert.SerializeObject(parameters);
}
return(SHA256(string.Format("{0}_{1}_{2}", _tag, returnTypeName, _parameters)));
}
public async static Task RemoveAsync <T>(this IDistributedCache distributedCache, Tag.Name tag, object parameters, CancellationToken token = default)
{
T value = default;
string cacheKey = GetCacheKey(tag, value, parameters);
await distributedCache.RemoveAsync(cacheKey, token);
await RemoveHashFromTagMap(distributedCache, tag, cacheKey, token);
}
public async static Task RemoveAsync(this IDistributedCache distributedCache, Tag.Name tag, CancellationToken token = default)
{
await RemoveHashesAndTagMap(distributedCache, tag, token);
}
public async static Task <T> GetAsync <T>(this IDistributedCache distributedCache, Tag.Name tag, object parameters, CancellationToken token = default) where T : class
{
T value = default;
string cacheKey = GetCacheKey(tag, value, parameters);
var result = await distributedCache.GetAsync(cacheKey, token);
value = result.FromByteArray <T>();
return(value);
}
public async static Task SetAsync <T>(this IDistributedCache distributedCache, Tag.Name tag, object parameters, T value, DistributedCacheEntryOptions options, CancellationToken token = default)
{
string cacheKey = GetCacheKey(tag, value, parameters);
await distributedCache.SetAsync(cacheKey, value.ToByteArray(), options, token);
await InsertHashIntoTagMap(distributedCache, tag, cacheKey, token);
}
public async static Task RemoveHashesAndTagMap(IDistributedCache distributedCache, Tag.Name tag, CancellationToken token = default)
{
string masterKey = string.Format("{0}_{1}", "master", tag.ToString());
var hashes = (await distributedCache.GetAsync(masterKey, token)).FromByteArray <List <string> >();
if (hashes == null)
{
hashes = new List <string>();
}
foreach (var hash in hashes)
{
await distributedCache.RemoveAsync(hash, token);
}
await distributedCache.RemoveAsync(masterKey, token);
}
public async static Task <T> FromAsync <T>(this IDistributedCache distributedCache, Tag.Name tag, object parameters, Func <Task <T> > query, DistributedCacheEntryOptions options, CancellationToken token = default) where T : class
{
T result = await distributedCache.GetAsync <T>(tag, parameters, token);
if (result == null)
{
result = await query.Invoke();
await SetAsync <T>(distributedCache, tag, parameters, result, options, token);
}
return(result);
}
public async static Task RemoveHashFromTagMap(IDistributedCache distributedCache, Tag.Name tag, string cacheKey, CancellationToken token = default)
{
string masterKey = string.Format("{0}_{1}", "master", tag.ToString());
var hashes = (await distributedCache.GetAsync(masterKey, token)).FromByteArray <List <string> >();
if (hashes == null)
{
hashes = new List <string>();
}
if (hashes.Contains(cacheKey))
{
hashes.Remove(cacheKey);
await distributedCache.SetAsync(masterKey, hashes.ToByteArray(), new DistributedCacheEntryOptions()
{
AbsoluteExpiration = null
}, token);
}
}