Caching asynchronous operations

Question

I am looking for an elegant way of caching the results of my asynchronous operations.

I first had a synchronous method like this:

public String GetSt         


        

Answer 1

I have made an wrapper for MemoryCache that basically caches Lazy> objects and works so that all the following problems are solved:

• No parallel or unnecessary operations to get a value will be started. Multiple call sites or threads could await for the same value from the cache.
• Failed Tasks are not cached. (No negative caching.)
• Cache users can't get invalidated results from the cache, even if the value is invalidated during an await.

The solution is further explained in my blog and the full working code is available at GitHub.