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EntLib's Object Builder Issues: What am I doing wrong?
First, let me describe the scenario, I am using Object Builder in a web application to manage the services of the application. Under load, we started to get exceptions from deep within Object Builder. I should also preface this by saying that I have very little knowledge of Object Builder and it is entirely possible that I am commiting some grave error in using it.
Anyway, here is a simple wrapper for Object Builder:
public class BuilderHelper
{
private Locator _locator = null;
public BuilderHelper():this(new Locator())
{
}
public BuilderHelper(Locator locator)
{
this._locator = locator;
if (!_locator.Contains(typeof(ILifetimeContainer)))
_locator.Add(typeof(ILifetimeContainer), new LifetimeContainer());
}
public T Build<T>()
{
BuilderStrategyChain chain = new BuilderStrategyChain();
chain.Add(new SingletonStrategy());
chain.Add(new CreationStrategy());
PolicyList policies = new PolicyList();
policies.SetDefault<ICreationPolicy>(new DefaultCreationPolicy());
BuilderContext builderContext = new BuilderContext(chain, _locator, policies);
T result;
result = (T)builderContext.HeadOfChain.BuildUp(builderContext, typeof(T), null, null);
return result;
}
}
And here is the client code:
[TestClass]
public class StressTestingFixture
{
private int count = 1000;
[TestMethod]
public void SimulateHeavyLoad()
{
ArrayList list = ArrayList.Synchronized(new ArrayList());
ManualResetEvent wait = new ManualResetEvent(false);
Locator locator = new Locator();
WaitCallback callback = delegate
{
wait.WaitOne();//This is required so there will be a lot of threads creating objects at the same time
try
{
BuilderHelper builder = new BuilderHelper(locator);
Something i1 = builder.Build<Something>();
if (count % 7 == 0)//need to make sure that GC Collection occurs, so it would clear the WeakRefDictionary
GC.Collect(2);
}
catch (Exception e)
{
string txt = e.ToString();
Console.WriteLine(txt);
list.Add(txt);
}
finally
{
Interlocked.Decrement(ref count);
}
};
for (int i = 0; i < count; i++)
{
ThreadPool.QueueUserWorkItem(callback);
}
wait.Set();
while (count > 0 && list.Count == 0)
Thread.Sleep(15);
if (list.Count > 0)
{
Assert.Fail((string)list[0]);
}
}
private class Something
{
}
}
The error I am getting:
at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
at Microsoft.Practices.ObjectBuilder.WeakRefDictionary`2.Add(TKey key, TValue value) in C:\Documents and Settings\orene\Desktop\Microsoft Enterprise Library January 2006\src\ObjectBuilder\Utility\WeakRefDictionary.cs:line 82
at Microsoft.Practices.ObjectBuilder.Locator.Add(Object key, Object value) in C:\Documents and Settings\orene\Desktop\Microsoft Enterprise Library January 2006\src\ObjectBuilder\Location\Locator.cs:line 59
at BuilderHelper..ctor(Locator locator) in C:\Documents and Settings\orene\Desktop\Microsoft Enterprise Library January 2006\UnitTests\ObjectBuilder\BuilderFixture.cs:line 42
at StressTestingFixture.<>c__DisplayClass1.<SimulateHeavyLoad>b__0(Object ) in C:\Documents and Settings\orene\Desktop\Microsoft Enterprise Library January 2006\UnitTests\ObjectBuilder\StressTestingFixture.cs:line 80
To say that this is worrying is a major understatement...
Any EntLib experts that can shed some light into this?
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