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Listing 6-23. Wiring the conferenceService Bean with Spring <bean id="conferenceService" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean" > <property name="transactionManager"><ref bean="transactionManager"/></property> <property name="target"><ref bean="conferenceServiceTarget"/></property> <property name="transactionAttributes"> <props> <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop> <prop key="submit*">PROPAGATION_REQUIRED</prop> </props> </property> </bean> In Listing 6-23 the bean conferenceService is an example of how to apply transaction demarcation to your bean methods declaratively. Although Spring provides both programmatic and declarative transaction management capabilities, it is recommended that you use declarative transactions for maximum flexibility and simpler code. For the conferenceService bean we are saying that for all methods whose name start with get , we will apply readOnly semantics, which provides a hint to the underlying transaction manager that can lead to runtime optimizations. We define the propagation behavior (whether to use, support/join, or create a new transaction) as PROPAGATION_REQUIRED, which means that the method will support the current transaction or create a new one if there is no transaction in context. PROPAGATION_REQUIRED is the most commonly used behavior and provides a pretty portable default choice for your transactions. There are more advanced features that can be applied to your transactions, such as timeouts and whether to rollback a transaction based on a given exception. Those features are out of the scope of this chapter, but you should investigate, especially if your application has complex transactional requirements like multiple distributed data sources or requirements on sometimes faulty third-party network services. The transactionManager property points to a bean of the same id. Spring offers several transaction managers to choose from, including a simple JDBC, JTA, and in the case of the TechConf application, the HibernateTransactionManager (for Hibernate version 3 as implied by the package name) shown in the bean configuration in Listing 6-24. Listing 6-24. Declaring the Transaction Manager <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory"><ref local="sessionFactory"/></property> </bean>

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With /optimize-, the unoptimized IL code produced by the C# compiler contains many no-operation (NOP) instructions and also branches that jump to the next line of code These instructions are emitted to enable the edit-and-continue feature of Visual Studio while debugging and the extra instructions also make code easier to debug by allowing breakpoints to be set on control flow instructions such as for, while, do, if, else, try, catch, and finally statement blocks When producing optimized IL code, the C# compiler will remove these extraneous NOP and branch instructions, making the code harder to single-step through in a debugger as control flow will be optimized Also, some function evaluations may not work when performed inside the debugger .

Channels are the mechanism used to transport messages between distributed applications. Channels don't handle the transmission directly, but they act as a binding between a URL scheme and the means by which a remoting operation can be serialized and transmitted. Channels are defined by three interfaces contained in the System.Runtime.Remoting.Channels namespace:

However, the IL code is smaller, making the resulting EXE/DLL file smaller, and the IL tends to be easier to read for those of you (like me) who enjoy examining the IL to understand what the compiler is producing Furthermore, the compiler produces a Program Database (PDB) file only if you specify the /debug(+/full/pdbonly) switch The PDB file helps the debugger find local variables and map the IL instructions to source code The /debug:full switch tells the JIT compiler that you intend to debug the assembly, and the JIT compiler will track what native code came from each IL instruction This allows you to use the just-in-time debugger feature of Visual Studio to connect a debugger to an already-running process and debug the code easily .

public interface IAsyncResult { Object AsyncState WaitHandle AsyncWaitHandle Boolean IsCompleted Boolean CompletedSynchronously } { { { { get; get; get; get; } } // Avoid using this } // Avoid using this } // true if the op completed synchronously

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Without the /debug:full switch, the JIT compiler does not, by default, track the IL to native code information which makes the JIT compiler run a little faster and also uses a little less memory If you start a process with the Visual Studio debugger, it forces the JIT compiler to track the IL to native code information (regardless of the /debug switch) unless you turn off the Suppress JIT Optimization On Module Load (Managed Only) option in Visual Studio When you create a new C# project in Visual Studio, the Debug configuration of the project has /optimize- and /debug:full switches, and the Release configuration has /optimize+ and /debug:pdbonly switches specified ..

4. Answer the following questions: What information is contained in the Dynamic DNS Updates section Which resource record will the DHCP server update with this information

In this code, x is also declared in Main s stack frame and is initialized to 5 . The address of x is then passed to AddVal . AddVal s v is a pointer to the Int32 value in Main s stack frame . Inside AddVal, the Int32 that v points to is required to have a value already . So, AddVal can use the initial value in any expression it desires . AddVal can also change the value, and the new value will be returned to the caller . In this example, AddVal adds 10 to the initial value . When AddVal returns, Main s x will contain 15, which is what gets displayed in the console . To summarize, from an IL or a CLR perspective, out and ref do exactly the same thing: they both cause a pointer to the instance to be passed . The difference is that the compiler helps ensure that your code is correct . The following code that attempts to pass an uninitialized value to a method expecting a ref parameter produces the following message: "error CS0165: Use of unassigned local variable 'x'."