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POMicrosoft Enterprise Library Caching Application Block not thread safe?
 

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    <p>I created a super simple console app to test out the Enterprise Library Caching Application Block, and the behavior is baffling. I'm hoping I screwed something that's easy to fix in the setup. I have each item expire after 5 seconds for testing purposes.</p> <p>Basic setup -- "Every second pick a number between 0 and 2. If the cache doesn't already have it, put it in there -- otherwise just grab it from the cache. Do this inside a LOCK statement to ensure thread safety.</p> <p>APP.CONFIG: </p> <pre><code>&lt;configuration&gt; &lt;configSections&gt; &lt;section name="cachingConfiguration" type="Microsoft.Practices.EnterpriseLibrary.Caching.Configuration.CacheManagerSettings, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /&gt; &lt;/configSections&gt; &lt;cachingConfiguration defaultCacheManager="Cache Manager"&gt; &lt;cacheManagers&gt; &lt;add expirationPollFrequencyInSeconds="1" maximumElementsInCacheBeforeScavenging="1000" numberToRemoveWhenScavenging="10" backingStoreName="Null Storage" type="Microsoft.Practices.EnterpriseLibrary.Caching.CacheManager, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="Cache Manager" /&gt; &lt;/cacheManagers&gt; &lt;backingStores&gt; &lt;add encryptionProviderName="" type="Microsoft.Practices.EnterpriseLibrary.Caching.BackingStoreImplementations.NullBackingStore, Microsoft.Practices.EnterpriseLibrary.Caching, Version=4.1.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" name="Null Storage" /&gt; &lt;/backingStores&gt; &lt;/cachingConfiguration&gt; &lt;/configuration&gt; </code></pre> <p>C#:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using Microsoft.Practices.EnterpriseLibrary.Common; using Microsoft.Practices.EnterpriseLibrary.Caching; using Microsoft.Practices.EnterpriseLibrary.Caching.Expirations; namespace ConsoleApplication1 { class Program { public static ICacheManager cache = CacheFactory.GetCacheManager("Cache Manager"); static void Main(string[] args) { while (true) { System.Threading.Thread.Sleep(1000); // sleep for one second. var key = new Random().Next(3).ToString(); string value; lock (cache) { if (!cache.Contains(key)) { cache.Add(key, key, CacheItemPriority.Normal, null, new SlidingTime(TimeSpan.FromSeconds(5))); } value = (string)cache.GetData(key); } Console.WriteLine("{0} --&gt; '{1}'", key, value); //if (null == value) throw new Exception(); } } } } </code></pre> <p>OUTPUT -- How can I prevent the cache from returning nulls?</p> <pre><code>2 --&gt; '2' 1 --&gt; '1' 2 --&gt; '2' 0 --&gt; '0' 2 --&gt; '2' 0 --&gt; '0' 1 --&gt; '' 0 --&gt; '0' 1 --&gt; '1' 2 --&gt; '' 0 --&gt; '0' 2 --&gt; '2' 0 --&gt; '0' 1 --&gt; '' 2 --&gt; '2' 1 --&gt; '1' Press any key to continue . . . </code></pre>
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    1. COSo in conclusion, The [Caching Application Block](http://msdn.microsoft.com/en-us/library/ff664753%28v=PandP.50%29.aspx) "performs in a thread-safe manner".
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