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The following sections describe how to use the IEventAggregator interface to create, publish, and subscribe to CompositePresentationEvent. Creating an Event The CompositePresentationEvent<TPayload> is intended to be the base class for application- or module-specific events. TPayLoad is the type of the event s payload. The payload is the argument that will be passed to subscribers when the event is published. For example, the following code shows the TickerSymbolSelectedEvent in the Stock Trader Reference Implementation (Stock Trader RI). The payload is a string containing the company symbol. Notice how the implementation for this class is empty.

SQL Server 2008 allows you to develop CLR stored procedures (as well as other routines) using a NET language of your choice The previous chapter provided background about CLR routines, gave advice on when to develop CLR routines versus T-SQL ones, and described the technicalities of how to develop CLR routines Remember to read Appendix A for instructions on developing, building, deploying, and testing your NET code Here I d just like to give a couple of examples of CLR stored procedures that apply functionality outside the reach of T-SQL code The first example is a CLR procedure called GetEnvInfo This stored procedure collects information from environment variables and returns it in table format The environment variables that this procedure will return include: Machine Name, Processors, OS Version, CLR Version Note that to collect information from environment variables, the assembly needs external access to operating system resources .

make it clear that changes will be considered in the context of what s best for the project overall.

It is interesting to note that if you simply refresh the browser, rather than click a button on the page, the counter will not be incremented.

By default, assemblies are created (using the CREATE ASSEMBLY command) with the most restrictive PERMISSION_SET option, SAFE, which means that they re limited to accessing database resources only This is the recommended option to obtain maximum security and stability The permission set options EXTERNAL_ACCESS and UNSAFE (specified in the CREATE ASSEMBLY or ALTER ASSEMBLY commands, or in the Project | Properties dialog box in Visual Studio under the Database tab) allow external access to system resources such as files, the network, environment variables, or the registry To allow EXTERNAL_ACCESS and UNSAFE assemblies to run, you also need to set the database option TRUSTWORTHY to ON Allowing EXTERNAL_ACCESS or UNSAFE assemblies to run represents a security risk and should be avoided I will describe a safer alternative shortly, but first I ll demonstrate this option .

So long as priority 31 threads are schedulable, the system never assigns any thread with a priority of 0 through 30 to a CPU This condition is called starvation, and it occurs when higher-priority threads use so much CPU time that they prevent lower-priority threads from executing Starvation is much less likely to occur on a multiprocessor machine because a priority 31 thread and a priority 30 thread can run simultaneously on such a machine The system always tries to keep the CPUs busy, and CPUs sit idle only if no threads are schedulable Higher-priority threads always preempt lower-priority threads, regardless of what the lowerpriority threads are executing .

To set the TRUSTWORTHY option of the CLRUtilities database to ON and to change the permission set of the CLRUtilities assembly to EXTERNAL_ACCESS, run the following code:.

For example, if a priority 5 thread is running and the system determines that a higher-priority thread is ready to run, the system immediately suspends the lower-priority thread (even if it s in the middle of its time-slice) and assigns the CPU to the higher-priority thread, which gets a full time-slice By the way, when the system boots, it creates a special thread called the zero page thread This thread is assigned priority 0 and is the only thread in the entire system that runs at priority 0 The zero page thread is responsible for zeroing any free pages of RAM in the system when no other threads need to perform work Microsoft realized that assigning priority levels to threads was going to be too hard for developers to rationalize .