Overwrite Cache Only After One Day and only when Factory Returns NOT NULL

[mpodonyi]

I have the following setup:

public async ValueTask<T> GetMyStuff<T>(string key, Func<CancellationToken, Task<T>> factory)
    {
        var expiration = TimeSpan.FromHours(24);
        
        
        return await _fusionCache.GetOrSetAsync<T>(
                key,
                factory,
                options => { options.SetDuration(expiration); },
                tags: null,
                token: default
            )
            ;
    }

Assuming there is already something in the Cache for this key and now the 24 hours are expired.

I want that the Cache Value gets replaced with the Factory Function Result only when this Factory is returning NOT NULL.

In case the Factory returns NULL I want that the current value stays in the cache and GetMyStuff returns the cached Value.

On next call to GetMyStuff there should be again a try to Call the Factory Function.

The Bottom Line is that the Cache Only gets Replaced when the Factory Function is returning successfully.

[jodydonetti]

Hi @mpodonyi
I see you closed this, did you solve it?

If I have to assume, you used Adaptive Caching with some added logic before returning from the factory, and maybe a bit of ctx.NotModified() taken from Conditional Refresh?

Just curious how you did solve it.

Let me know, thanks!