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Figure 9-9. Calling managed virtual functions from native code In this sample, both main and the virtual functions of SampleClass are compiled to managed code. Since native callers could also call the virtual functions, the vtable entries in the SampleClass vtable are function pointers to unmanaged-to-managed thunks. When managed code calls such a virtual function, it first picks the corresponding virtual function pointer from the vtable. To call the virtual function via the function pointer, a managed-to-unmanaged thunk is necessary because the vtable entry refers to the unmanaged-to-managed thunk, which is an unmanaged function.

The <spring:nestedTag> is not required if you have nested objects in your command bean, but it Tip

Listing 11-1. The Microsoft.SPOT.Bitmap Class using Microsoft.SPOT.Presentation.Media; using System; namespace Microsoft.SPOT { public sealed class Bitmap : MarshalByRefObject { // constants public const ushort OpacityOpaque = 256; public const ushort OpacityTransparent = 0; // static properties public static readonly public static readonly public static readonly public static readonly

Controller It is time to look at the concrete implementation of the wizard itself, which surprisingly isn t that complicated. The AbstractWizardFormController does a good job at performing the work of page flows and validation. All that we have left to do is to fill out the validation logic and save the Account instance at the end of the wizard. Listing 6-73 contains the Controller implementation. Listing 6-73. Wizard Controller public class CreateAccountWizardController extends AbstractWizardFormController { private AccountService accountService; public CreateAccountWizardController() { setCommandName("createAccount");

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In this scenario, managed code calls the managed function SampleClass::F2 with two transitions, not directly. This is another variant of the double-thunking problem. Since in C++ code, virtual functions are used more often than function pointers, double-thunking occurs more often in this context. To solve this problem, virtual functions of native classes can be defined with the managed calling convention __clrcall. By using this calling convention, you close the door for native callers managed callers, on the other hand, do not face the double-thunking problem. However, you should be aware that you can only avoid double thunking if you use __clrcall when you introduce the virtual function. It is not possible to overwrite a virtual function that has a native calling convention with a __clrcall function. For example, if a native class library defines the virtual function void __thiscall f(), you cannot provide the override void __clrcall f().

setCommandClass(CreateAccount.class); setValidator(new CreateAccountValidator()); setPages(new String[]{"usernameAndEmail", "billingAddress"}); } public void setAccountService(AccountService accountService) { this.accountService = accountService; } @Override protected void validatePage(Object command, Errors errors, int page) { CreateAccount createAccount = (CreateAccount) command; CreateAccountValidator validator = (CreateAccountValidator) getValidator(); switch (page) { case 0: validator.validatePage0(createAccount, errors); break; case 1: validator.validatePage1(createAccount, errors); break; } } @Override protected ModelAndView processFinish(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception { CreateAccount createAccount = (CreateAccount) command; accountService.saveAccount(createAccount.getAccount()); return new ModelAndView("createAccountSuccess", "account", createAccount.getAccount()); } } This controller looks a lot like a SimpleFormController, with the exception of the validatePage() method.

The development board HiCO.ARM9-SBC (Figure 2-18) is a single board computer with a HiCO.ARM9-Core module and connector on board.

Summary

So far, I have only mentioned that calls via thunks are slower than method calls that do not cross a managed-unmanaged boundary. To decide whether the overhead of a transition is acceptable or not, you will likely need more precise information. The next sections explain the overhead of the different transitions. I will especially examine transitions based on interoperability vtables, P/Invoke metadata, and the CALLI instruction. Furthermore, I will discuss how to use a special optimization option for P/Invoke metadata and certain internal aspects of managed-unmanaged thunks that can affect the way you write code. To discuss the overhead of transitions, I have written an application that measures different interoperability scenarios. The code for this application is provided in Appendix B. You can also download it from the Source Code/Download section of the Apress web site (www.apress. com/) so that you can reproduce the performance tests on your machine or adapt them to your own special scenarios. To determine the performance of thunks for C functions, the application uses a native and a managed global function defined in the application itself (fManagedLocal and fNativeLocal), as well as a native and a managed function imported from an external DLL (fManagedFromDLL and fNativeFromDLL). The application measures how long it takes to call each of these methods directly, as well as via function pointers from native and managed code. For each measurement, 100 million calls are done. Table 9-2 shows the measured results on my machine (Pentium M 780, 2.26 GHz).

Summary

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