CODEWITHSUNDEEP
c#asp.netcaching
terjetyl
terjetyl

Reputation: 9565

In asp.net how can I serve the old cache while building the new one?

Usually after a cache timeout the cache is emptied and the next request will build up the cache again causing very variable response times. In asp.net (I am using 4.0) what is the best way to serve the old cache while the new one is building?

I am using HttpRuntime.Cache

Upvotes: 0

Views: 123

Answers (1)

terjetyl
terjetyl

Reputation: 9565

I found a solution that seems to work nicely. Its based on another answer here on the site

public class InMemoryCache : ICacheService
{
    public T Get<T>(string key, DateTime? expirationTime, Func<T> fetchDataCallback) where T : class
    {
        T item = HttpRuntime.Cache.Get(key) as T;
        if (item == null)
        {
            item = fetchDataCallback();
            HttpRuntime.Cache.Insert(key, item, null, expirationTime ?? DateTime.Now.AddMinutes(10), TimeSpan.Zero, CacheItemPriority.Normal, (
                s, value, reason) =>
                {
                    // recache old data so that users are receiving old cache while the new data is being fetched
                    HttpRuntime.Cache.Insert(key, value, null, DateTime.Now.AddMinutes(10), TimeSpan.Zero, CacheItemPriority.Normal, null);

                    // fetch data async and insert into cache again
                    Task.Factory.StartNew(() => HttpRuntime.Cache.Insert(key, fetchDataCallback(), null, expirationTime ?? DateTime.Now.AddMinutes(10), TimeSpan.Zero, CacheItemPriority.Normal, null));
                });
        }
        return item;
    }
}

Upvotes: 1

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