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There are two scenarios that can result in wrong GetLastError values due to the GetLastErrorcaching optimizations that are done by C++/CLI and the CLR. Both scenarios are unlikely, but according to Murphy s Law, unlikely means that they will surely occur at some time. Therefore, you should be aware of them. The first scenario is related to the optimizations done for native functions that are not imported from a DLL, but reside in the same project. As mentioned before, for these native local functions, C++/CLI automatically generates P/Invoke metadata without the lasterror flag, because it is very uncommon to use the GetLastError value to communicate error codes within a project. However, the MSDN documentation on GetLastError allows you to use SetLastError and GetLastError for your own functions. Therefore, this optimization can theoretically cause wrong GetLastError values. As an example, the output of the following application depends on the compilation model: // GLECachingTrouble1.cpp // build with "CL /clr GLECachingTrouble1.cpp" // or with "CL GLECachingTrouble1.cpp" #include <windows.h> #include <stdio.h> void managedFunc() { SetLastError(0x42); } // remember that you usually should not use #pragma [un]managed. // It is used here only to avoid discussing two different source files. #pragma managed(push, off) void nativeFunc() { SetLastError(0x12345678); } #pragma managed(pop) int main() { managedFunc(); nativeFunc(); // if app is built with /clr, the next line writes "0x42" instead of "0x12345678"! printf("0x%X", GetLastError()); }

package org.jboss.ejb3.examples.employeeregistry.ch14.listener; /** * Tracks events fired by the {@link EntityListenerEmployee} * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @version $Revision: $ */ public class EventTracker { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /* * Flags denoting whether an event was fired */ public static boolean prePersist; public static boolean postPersist; public static boolean postLoad; public static boolean preUpdate; public static boolean postUpdate; public static boolean preRemove;

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A traditional Data Access layer consists of a set of methods or services that interact with the database, and with the objects that encapsulate data. The data access code itself is typically outside the objects, rather than being encapsulated within the objects. This, however, breaks encapsulation, since it means that the objects data must be externalized to be handled by the data access code. The framework created in this book allows for the data access code to be encapsulated within the business objects, or externalized into a separate set of objects. As you ll see in 7, there are both performance and maintainability benefits to including the data access code directly inside each business object. However, there are security and manageability benefits to having the code external. Either way, the concept of a data access layer is of key importance. Maintaining a strong logical separation between the data access code and business logic is highly beneficial, as discussed earlier in this chapter. Obviously, having a totally separate set of data access objects is one way to clearly implement a data access layer. However, logical separation doesn t require putting the logic in separate classes. It is enough to put the data access code in clearly defined data access methods. As long as no data access code exists outside those methods, separation is maintained.

creating table storage, an account with a base-64 security key and storage end points is assigned at the time you register a storage type project on the Azure portal page. In the development environment the account information can either be hard-coded in the configuration file or entered programmatically. Listing 3-1 shows the configuration settings from the configuration file for queue storage. Listing 3-1. Account and HTTP Port End Point Configuration for Queue Storage in the Development Environment <appSettings> <add key = "AccountName" value="devstoreaccount1"/> <add key = "AccountSharedKey" value="<ACCOUNT_KEY>"/> <add key="QueueStorageEndpoint" value="http://127.0.0.1:10001" /> </appSettings>

In other words, a session bean can set alarms so that the container will call it when a specific date arrives or some interval of time has passed. The Timer Service can also be injected using the @Resource annotation. The Timer Service is covered in detail in 19. The EJBContext.getCallerPrincipal() method is used to obtain the java.security. Principal object representing the client that is currently accessing the bean. The Prin cipal object can, for example, be used by an EJB to track the identities of clients making updates:

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