/// <summary>
/// Async get or create cache value
/// </summary>
/// <typeparam name="T">Type of the value cached or to be cached</typeparam>
/// <param name="cacheKey">Key of the cache</param>
/// <param name="valueProviderFunc">Value provider function in case the value is not in the cache</param>
/// <param name="cancellationToken">The cancellation token</param>
/// <returns>The requested cache value</returns>
public async Task <T> GetOrCreateValueAsync <T>(string cacheKey, Func <T> valueProviderFunc, CancellationToken cancellationToken = default)
{
// Try to get cache value from local cache
var localCacheValue = await _inMemoryCacheProvider.GetAsync <T>(cacheKey, cancellationToken);
if (localCacheValue != null)
{
// Touch distributed cache to mark usage but otherwise return the local value
_ = _distributedCacheProvider.GetAsync <T>(cacheKey, cancellationToken);
return(localCacheValue);
}
// Try to get cache value from the distributed cache if not found in the local one
var distributedCacheValue = await _distributedCacheProvider.GetAsync <T>(cacheKey, cancellationToken);
if (distributedCacheValue != null)
{
// "Download" value to local cache
_ = _inMemoryCacheProvider.SetAsync(cacheKey, distributedCacheValue, cancellationToken);
return(distributedCacheValue);
}
// Cache not found in any of the cache providers so obtain it using the given provider function
var cacheValueToSet = valueProviderFunc.Invoke();
// Fill in cache
_ = _inMemoryCacheProvider.SetAsync(cacheKey, cacheValueToSet, cancellationToken);
_ = _distributedCacheProvider.SetAsync(cacheKey, cacheValueToSet, cancellationToken);
// Return the obtained value
return(cacheValueToSet);
}
public async void GetAsync()
{
// Arrange
object cacheKey = "Unit-Test-Cache";
object innerCacheValue = "MockCacheValue";
_innerCacheMock.Setup(ic => ic.TryGetValue(cacheKey, out innerCacheValue));
// Act
var obtainedCacheValue = await _cacheProvider.GetAsync <string>(cacheKey.ToString());
// Assert
Assert.Equal(innerCacheValue, obtainedCacheValue);
}