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POMemoryCache: Why is this integration test failing? UpdateCallBack looks like it's broken
 

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  1. POMemoryCache: Why is this integration test failing? UpdateCallBack looks like it's broken
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    <p>In a sane world, I would have expected the <code>UpdateCallBack</code> property to increment my collection of arguments. But it doesn't: in the final line of this test, the <code>updateArguments</code> collection is expected to be 3 (twice for each <code>Set</code> call and once for the <code>Remove</code> call), but it is empty.</p> <p>The test is rough and ready, but it should be enough to illustrate that something odd is happening.</p> <p>Or that I am missing something obvious.</p> <p>EDIT: This is getting stranger. Based on the question <a href="https://stackoverflow.com/questions/9650614/memorycache-updatecallback-not-working">MemoryCache UpdateCallback not working</a>, which says that <code>Thread.Sleep</code> blocks the <code>MemoryCache.Default</code> object, I changed the original <code>Thread.Sleep(5000)</code> call to <code>Task.Factory.StartNew(() =&gt; Thread.Sleep(10000)).Wait();</code>. Then, if I comment out the call to <code>MemoryCache.Default.Remove()</code>, the <code>updateArguments</code> collection does indeed get incremented, but only once, and that is when the <code>"PersonKey"</code> cached item expires. The two <code>Set()</code> and one <code>Remove()</code> calls are ignored completely. I'm having a "What the heck" moment.</p> <pre><code>[Test] public void TheMemoryCacheMaintainsAMemberAndInvokesTheUpdateCallback() { var person = new Person { GivenName = "Rob", LastName = "Lyndon"}; var givenName = person.GivenName; var lastName = person.LastName; var updateArguments = new List&lt;CacheEntryUpdateArguments&gt;(); MemoryCache.Default.Set("PersonKey", person, CreateNewPolicy(updateArguments)); var cachedItem = MemoryCache.Default.Get("PersonKey") as Person; Assert.IsNotNull(cachedItem); Assert.That(cachedItem.GivenName, Is.EqualTo(givenName)); Assert.That(cachedItem.LastName, Is.EqualTo(lastName)); person.LastName = "Lyndon - Updated"; MemoryCache.Default.Set("PersonKey", member, CreateNewPolicy(updateArguments)); cachedItem = MemoryCache.Default.Get("PersonKey") as Person; Assert.IsNotNull(cachedItem); Assert.That(cachedItem.GivenName, Is.EqualTo(givenName)); Assert.That(cachedItem.LastName, Is.EqualTo(lastName + " - Updated")); Task.Factory.StartNew(() =&gt; Thread.Sleep(10000)).Wait(); Thread.Sleep(5000); Assert.That(updateArguments.Count, Is.EqualTo(3)); } private static CacheItemPolicy CreateNewPolicy(ICollection&lt;CacheEntryUpdateArguments&gt; updateArguments) { return new CacheItemPolicy { AbsoluteExpiration = DateTimeOffset.Now.AddSeconds(1), UpdateCallback = args =&gt; updateArguments.Add(args) }; } </code></pre>
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    1. USCommunity
    1. USRob Lyndon
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    1. COWhere does it fail for you Rob and what's the failure message?
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      1. USJamie Dixon
    2. COIt fails on the last line. `updateArguments` should be 3 (incremented twice for the `Set` operations and once for the `Remove` operation.
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      1. POMemoryCache: Why is this integration test failing? UpdateCallBack looks like it's broken
      1. USRob Lyndon
    3. COLooks like you might be expecting the `updateArguments` parameter of `CreateNewPolicy` to be being passed by `ref`. If it's being passed by value then changes made to it inside of `CreateNewPolicy` won't persist outside of the scope of that method.
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      1. POMemoryCache: Why is this integration test failing? UpdateCallBack looks like it's broken
      1. USJamie Dixon
 

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