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The activationAttributes argument is an array of objects that contain some activation attributes. The UrlAttribute object is an example of a parameter to the CreateInstance() method, which determines where activation will take place. ' Load the assembly from the reflection library with a ' partial reference partial = "DynamicAssembly" oAssembly = System.Reflection.Assembly.LoadWithPartialName(partial) ' Load the assembly with a full reference, ' but using the LoadWithPartialName partial = "DynamicAssembly, Version=1.0.950.28158, _ Culture=neutral, PublicKeyToken=null" oAssembly = System.Reflection.Assembly.LoadWithPartialName(partial) The following is a trivial example that demonstrates how to load the assembly dynamically and create an instance of the class. First in a class library, the example creates a simple class with two constructors: a default constructor that takes in no arguments, and another constructor that takes in a long argument. It stores the argument in a private variable. We also create a method that returns that number. Public Class CDynamicLoadedClass Sub New() m_lNumber = -1 End Sub Sub New(ByVal lDefault As Long) m_lNumber = lDefault End Sub Public Function GetNumber() As Long Return m_lNumber End Function Private m_lNumber As Long End Class Now, we ll create a simple Windows form application that has a single command button on it. In the command button routine, we ll place the code to dynamically load the object. Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Dim oAssemblyName As System.Reflection.AssemblyName Dim oAssembly As System.Reflection.Assembly Dim oClass As DynamicAssembly.CDynamicLoadedClass Dim args(0) As Object ' Use the AssemblyName object oAssemblyName = New System.Reflection.AssemblyName() oAssemblyName.Name = "DynamicAssembly" oAssemblyName.Version = New Version("1.0.950.28158") oAssembly = System.Reflection.Assembly.Load(oAssemblyName)

I recommend you chose a nondictionary word that includes special characters and is at least eight characters long.

Summary

' Since you are not passing in an args array, ' use the default constructor oClass = _ oAssembly.CreateInstance("DynamicAssembly.CDynamicLoadedClass") MsgBox(oClass.GetNumber()) oClass = Nothing ' Set up the args array. ' We will pass in 1 object with a datatype of Long args(0) = CLng(5) oClass = _ oAssembly.CreateInstance( _ "DynamicAssembly.CDynamicLoadedClass", _ True, Nothing, Nothing, args, Nothing, Nothing) MsgBox(oClass.GetNumber()) End Sub The result of this simple program is two message boxes. The first displays a value of -1 and the second displays a value of 5. This demonstrates which constructor was used in instantiating the object.

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In this chapter, we stressed the importance of benchmarking and profiling techniques for the professional developer and administrator You ve learned how setting up a benchmarking framework can enable you to perform comprehensive (or even just quick) performance comparisons of your design features and help you to expose general bottlenecks in your MySQL applications You ve seen how profiling tools and techniques can help you avoid the guesswork of application debugging and diagnostic work In our discussion of benchmarking, we focused on general strategies you can use to make your framework as reliable as possible The guidelines presented in this chapter and the tools we covered should give you an excellent base to work through the examples and code presented in the next few chapters.

Caution I don t want people to view the password contained in this option, so I m going to secure this

Dynamic assembly loading is a powerful tool provided by .NET, but to fully utilize it, a structure must be created that organizes the logic to decide which assembly to load and which object to instantiate without affecting the calling assembly. The technique of centralizing object instantiation is not unique to .NET. Object-oriented (OO) developers in languages such as C++ and Java use a construct called the abstract factory pattern. This technique, like many common OO architectures, derives from SmallTalk, and the Design Patterns book (Addison Wesley, 1994). The authors of that book identified the abstract factory pattern as a way to provide a centralized location for the selection of a class to dynamically load. The abstract factory pattern allows a programmer to obtain an object matching a particular interface, but only choosing which specific class to instantiate at runtime. One of several possible classes could be instantiated, but whichever is returned, the calling code can treat the object the same because it implements a particular interface. The specific type of the returned object might be completely unknown to the calling code.

As we cover various aspects of the MySQL query optimization and execution process, remember that you can fall back on your established benchmarking framework in order to test the theories we outline next The same goes for the concepts and tools of profiling We hope you come away from this chapter with the confidence that you can test your MySQL applications much more effectively The profilers and the diagnostic techniques we covered in this chapter should become your mainstay as a professional developer Figuring out performance bottlenecks should no longer be guesswork or a mystery In the upcoming chapters, we re going to dive into the SQL language, covering JOIN and optimization strategies deployed by MySQL in 7 We ll be focusing on real-world application problems and how to restructure problematic SQL code.

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