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) When you call a method through the delegate, you are actually relying on the Invoke() method of the delegate class The Invoke() method executes the linked method synchronously However, the delegate class also includes methods for asynchronous invocation BeginInvoke() and EndInvoke() When you use BeginInvoke(), the call returns immediately, but it doesn t provide the return value Instead, the method is simply queued to start on another thread When calling BeginInvoke(), you supply all the parameters of the original method, plus two additional parameters for an optional callback and state object If you don t need these details (described later), simply pass a null reference IAsyncResult async = doSomethingBeginInvoke(12, null, null); BeginInvoke() doesn t return the return value of the underlying method Instead, it returns an IAsyncResult object that you can examine to determine when the asynchronous operation is complete.

Client request received and connection authorized (see Figure 15-1) MySQL determines which privilege(s) and scope are required Required privilege: SELECT Database: ToyStore Table: Customer Columns: login, password

To pick up the results later on, you submit the IAsyncResult object to the matching EndInvoke() method of the delegate EndInvoke() waits for the operation to complete if it hasn t already finished and then provides the real return value If any unhandled errors occurred in the method that you executed asynchronously, they ll bubble up to the rest of your code when you call EndInvoke() Here s the previous example rewritten to call the delegate asynchronously:.

For instance, you can register the NEWDB database instance by running the following at the command line:

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MyObject myObj = new MyObject(); // Create a delegate that points to the myObj.DoubleNumber() method. DoSomethingDelegate doSomething = new DoSomethingDelegate(myObj.DoubleNumber); // Start the myObj.DoubleNumber() method on another thread. IAsyncResult async = doSomething.BeginInvoke(originalValue, null, null); // (Do something else here while myObj.DoubleNumber() is executing.) // Retrieve the results, and wait (synchronously) if they're still not ready. int doubleValue = doSomething.EndInvoke(async);

Rows exists in user table for: user.User='jpipes' AND user.Host='localhost' AND user.Select_priv='Y'

Once you have done that, you should also ensure that all the performance counters are enabled. Using the Windows Registry Editor (regedit.exe) tool, navigate to the following key:

Note Most of the time, the EndInvoke() method takes a single parameter the IAsyncState object. However,

Row exists for: db.User='jpipes' AND (db.Host='localhost' OR db.Host=") AND db.Db='ToyStore' MySQL denies request No Row exists in db table for: db.User='jpipes' AND db.Host='localhost' AND db.Db='ToyStore'

if your method uses out or ref parameters, the EndInvoke() method will also be responsible for supplying these values. As a result, you ll need to supply all these parameters to EndInvoke(), followed by the IAsyncState parameter.

This key will be set to 0 (disabled). To enable all the counters, change this value to 4095. You will next need to restart the Oracle database instance. As mentioned earlier, you can also view the performance counters visually in the Reliability and Performance Monitor tool provided by Windows in the Start Control Panel Administrative Tools area. Launch the monitoring tool, highlight the Performance Monitor node, and click the Add Counters menu item. This will pop open a window showing a list of counters. Locate the Oracle Data Provider for .NET counter, and move all the counters into the Added Counters list, as shown in Figure 12-1.

To gain some of the benefits of multithreading with this technique, you could call several methods asynchronously with BeginInvoke(). You could then call EndInvoke() on all of them before continuing. The assumption in this case is that you need to perform every task before continuing. It doesn t matter what order you use, because you ll always need to wait for the slowest method. But in a more sophisticated application, you ll want to have different tasks running over different periods of time, and you ll need a way to check their status or react when they are complete, as described in the next section.

Yes db.Select_priv = 'Y'

When you invoke a delegate asynchronously, no new thread is created. Instead, the CLR automatically assigns a free thread from a small thread pool that it maintains. Typically, this thread pool starts with one thread and increases to a maximum of about 25 free threads on a single-CPU computer. As a result, if you start 50 asynchronous operations, one after the other, the first 25 will complete first. As soon as one ends, the freed thread is used to execute the next asynchronous operation . Usually, this is exactly the behavior you want, because it allows you to avoid worrying about creating too many threads, in which case none get enough access to the CPU and the overhead is multiplied. However, if you really want the ability to create new threads at will, or you want to be able to pause, prioritize, or abort an in-progress thread, you ll need to tackle the more advanced Thread class that s described later in this chapter.

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