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As you can see in both tables, calls across managed-unmanaged boundaries produced by C++/CLI can be more than 500 percent slower than calls without transitions. However, unless you have a large number of transitions, this overhead can likely be ignored. The difference in overhead between the 10 million calls to fManagedLocal from native callers (~2.12s) and the 10 million calls from managed callers (~0.32s) is about 1.8 seconds. In addition to the measured time, both tables also show the transitions that occur in the different scenarios. For example, for the direct call to fManagedLocal from managed code, the text M M shows that a call from managed code to managed code has occurred. Cells with the text U M indicate an unmanaged-to-managed transition. Likewise, M U stands for a managed-to-unmanaged transition. For the indirect call to fManagedLocal from managed code, the text M U M indicates a transition from managed code to unmanaged code and back to managed code. This is the double-thunking scenario discussed earlier. In addition to the double-thunking case, Table 92 also shows the cost for an indirect method call with a __clrcall function pointer, which can prevent double thunking, as discussed earlier. As you can see, double thunking can easily increase the costs for method calls by more than 600 percent. Table 9-3 shows similar results for the double-thunking problem related to virtual function calls.

CenterX; CenterY; MaxHeight; MaxWidth;

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The standard ThrowawayController can t support any fine grained data binding configuration because there is no callback to specify any custom PropertyEditors. If there are any data binding errors, the controller never knows about them, making proper error handling cumbersome. Enter the ValidatableThrowawayController, as shown in Listing 6-77, which adds a bit more complexity but fills in the gaps of error handling. This controller type is still a stateless Command pattern implementation of a controller, so you should use it wherever you would use a ThrowawayController but require the ability to register custom PropertyEditors or build work flows that take into account any errors. Listing 6-77. ValidatableThrowawayController public interface ValidatableThrowawayController { String getName(); void initBinder(DataBinder binder) throws Exception; ModelAndView execute(BindException errors) throws Exception; } If you wish to use this controller, you must also declare a ValidatableThrowaway ControllerHandlerAdapter in your WebApplicationContext. If you do, be sure to also include any other handler adapters, as the defaults are only included if no handler adapter is found in the ApplicationContext.

// constructors public Bitmap(byte[] imageData, Bitmap.BitmapImageType type); public Bitmap(int width, int height); // determining dimensions public int Height { get; } public int Width { get; } // erasing the bitmap public void Clear(); // drawing pixels public Color GetPixel(int xPos, int yPos); public void SetPixel(int xPos, int yPos, Color color); // drawing lines public void DrawLine(Color color, int thickness, int x0, int y0, int x1, int y1);

For unmanaged-to-managed transitions, there is no potential for improving the performance of the generated thunks There are no hidden keywords or attributes that can be used for optimizations of transitions in this direction An unmanaged-to-managed thunk has to perform certain expensive operations For example, it is possible that a managed function is called by a thread that has not yet executed managed code The unmanaged-to-managed thunk must be prepared for that case so that a native thread will be automatically promoted to a managed thread before the managed function is called In case of a mixed-code DLL, it is also possible that the managed part of the assembly has not been initialized In this case, the thunk has to ensure the managed initialization You cannot optimize the performance of unmanaged-to-managed thunks Your only optimization option is to reduce the number of unmanaged-to-managed transitions.

The Servlet 2.3 specification introduced the idea of filters, common code that can wrap one or more servlets to provide pre- and post-processing of the request and response. Spring MVC supports an analogous concept with its HandlerInterceptors, which wrap request handlers to provide common functionality. Interceptors handle more life cycle events than a standard filter, but filters are more powerful, in that they may directly manipulate or replace the HttpServletRequest and HttpServletResponse objects. Listing 6-78 contains the HandlerInterceptor interface.

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