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POMemoryCache AbsoluteExpiration acting strange
 

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    <p>I'm trying to use a <code>MemoryCache</code> in .net 4.5 to keep track of and automatically update various items, but it seems like no matter what I set as an <code>AbsoluteExpiration</code> it will always only expire in 15 seconds or more.</p> <p>I want the cache items to expire every 5 seconds, but it always expires in at least 15 seconds, and if I move the expiration time out, it will end up being something like 15 seconds + my refresh interval, but never less than 15 seconds.</p> <p>Is there some internal timer resolution that I'm not seeing? I looked through a bit of the reflected <code>System.Runtime.Caching.MemoryCache</code> code and nothing stood out to me, and I haven't been able to find anybody else who has this issue out on the internet.</p> <p>I have a very basic example below that illustrates the problem.</p> <p>What I want is for <code>CacheEntryUpdate</code> to be hit every 5 seconds or so and update with new data, but, as I've said, it only ever gets hit in 15+ seconds.</p> <pre><code>static MemoryCache MemCache; static int RefreshInterval = 5000; protected void Page_Load(object sender, EventArgs e) { if (MemCache == null) MemCache = new MemoryCache("MemCache"); if (!MemCache.Contains("cacheItem")) { var cacheObj = new object(); var policy = new CacheItemPolicy { UpdateCallback = new CacheEntryUpdateCallback(CacheEntryUpdate), AbsoluteExpiration = DateTimeOffset.UtcNow.AddMilliseconds(RefreshInterval) }; var cacheItem = new CacheItem("cacheItem", cacheObj); MemCache.Set("cacheItem", cacheItem, policy); } } private void CacheEntryUpdate(CacheEntryUpdateArguments args) { var cacheItem = MemCache.GetCacheItem(args.Key); var cacheObj = cacheItem.Value; cacheItem.Value = cacheObj; args.UpdatedCacheItem = cacheItem; var policy = new CacheItemPolicy { UpdateCallback = new CacheEntryUpdateCallback(CacheEntryUpdate), AbsoluteExpiration = DateTimeOffset.UtcNow.AddMilliseconds(RefreshInterval) }; args.UpdatedCacheItemPolicy = policy; } </code></pre>
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    1. COWhy do you want to cache the object(s) for such a short amount of time? There doesn't seem to be much value to using a cache if the objects are going to be evicted in 5-15 seconds.
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