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class TestPoolAllocation { IObjectPool< TestPoolAllocation> _parent; public TestPoolAllocation( IObjectPool< TestPoolAllocation> parent) { _parent = parent; } ~TestPoolAllocation() { _parent.ReturnObject( this); } } The class TestPoolAllocation has a constructor parameter parent, which represents the object pool collection manager. The parent parameter is assigned to the data member _parent. A pooled object has a reference to the object pool collection that instantiated it. When a client finishes using a pooled object, the .NET garbage collector will collect the pooled object and call the finalizer (~TestPoolAllocation). This in turn causes the pooled object to call the method _parent.ReturnObject, which creates a strong reference to the pooled object by the pool, thus resurrecting the pooled object. There is a catch in this pooled object scenario, namely that the object pool collection can t reference the pooled object when a client is using the pooled object. The garbage collector will only call the TestPoolAllocation finalizer if no references exist to the instance. Were the pool collection to have a reference, there would be no need to garbage collect the object, thus the garbage collector never calls the finalizer. The only time when the object pool collection can reference the pooled object is if the pooled object is available for reuse. Making an object poolable requires the additional steps of adding a constructor with a parameter and adding a finalizer (destructor). This might deter usage because it requires modifications of already existing types. However, to convert an existing object into a pooled object does require some changes. Consider the scenario of adding a pooled object back into the pool. Before the pooled object can be used, it has to be reset to some initialized state. Not doing that would cause objects to use an object that has the state from previous client interactions.

Figure 2-58. The Repeat overflow If you really want to rock n roll with this technique, change the gradient type to Radial, reduce the size of the gradient with the Gradient Transform tool, and select the Repeat option. As shown in Figure 2-59, the result resembles the Looney Tunes logo background.

Figure 2-59. That s all, folks!

Once the client references the SoapContext for the request message, it can reference or assign WS-Specifications with the WSE API. For example, if the incoming request message requires digital signing with a certificate, then the

The next technique is one a lot of Flash designers tend to overlook: using an image, not a gradient or a solid color, to fill an object. There are two methods of accomplishing this, and they each have a different result. Let s try them:

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Knowing OOP and its associated terms means that you know the ingredients of the various patterns. You won t know how to apply the ingredients properly, as the patterns will cover that aspect. But when the term virtual or inheritance is used, you ll know what that encompasses with respect to the .NET platform. When a pattern is explained and implemented, you can pick apart the different OOP techniques used and learn the abstract idea behind the pattern. This makes it possible to see beyond the individual keywords and start thinking in strategies.

1. Open the ImageFill.fla file, and open the Color panel. 2. Select Bitmap as the fill type. In cases where the FLA does not yet contain imported images, an

Web service can inspect the attached digital signatures using SoapContext (as shown in Listing 5-4 earlier). The Web service can also use SoapContext to modify outgoing response messages. Unlike the service proxy class (described in the next section), the Web service itself does not need to derive from a specialized class in order to access the WSE functionality. However, you need to make sure the WSE support assemblies are correctly registered in the service s web.config file.

Import to Library dialog box will open at this point. In this sample file, an image already exists in the Library panel, so you ll see the Import button instead.

3. Click the Import button, if you like, to import an image of your own. If you go this route, use the

he purpose of this chapter is to show you how to log, generate exceptions, and do test-driven development (TDD). These three topics aren t generally covered in books on patterns or object-oriented design, but are extremely important for understanding OOP. It s important to cover these topics early in this book, because these concepts make an application stable, robust, and if an error does occur reproducible. The worst thing that can happen to an application is finding a bug that cannot be tracked or reproduced. If you implement the three topics from this chapter in your application, those problems cannot happen.

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