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FileCache should provide a AddOrGetExisting method which takes a factory #56
Description
Currently the AddOrGetExisting method takes a value, which requires you to pre-compute the value whether or not the entry is already in the cache. Instead it should take a generator method (Func<T>) which will generate the value in the instance of a cache miss. See https://github.com/alastairtree/LazyCache for an example of this, copied here:
// Declare (but don't execute) a func/delegate whose result we want to cache
Func<ComplexObjects> complexObjectFactory = () => methodThatTakesTimeOrResources();
// Get our ComplexObjects from the cache, or build them in the factory func
// and cache the results for next time under the given key
ComplexObjects cachedResults = cache.GetOrAdd("uniqueKey", complexObjectFactory);It should also provide an async overload for this operation as well
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