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Delegates are fairly interesting constructs in that they enable two objects in memory to engage in a two-way conversation. As you may agree, however, working with delegates in the raw does entail a good amount of boilerplate code (defining the delegate, declaring necessary member variables, and creating custom registration/unregistration methods). Because the ability for one object to call back to another object is such a helpful construct, C# provides the event keyword to lessen the burden of using delegates in the raw. When the compiler processes the event keyword, you are automatically provided with registration and unregistration methods as well as any necessary member variable for your delegate types. In this light, the event keyword is little more than syntactic sugar, which can be used to save you some typing time.

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Even if you choose to leverage the C# event keyword, you are still required to manually define the related delegate types.

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Defining an event is a two-step process. First, you need to define a delegate that contains the methods to be called when the event is fired. Next, you declare the events (using the C# event keyword) in terms of the related delegate. In a nutshell, defining a type that can send events entails the following pattern (shown in pseudo-code): public class SenderOfEvents { public delegate retval AssociatedDelegate(args); public event AssociatedDelegate NameOfEvent; ... } The events of the Car type will take the same name as the previous delegates (AboutToBlow and Exploded). The new delegate to which the events are associated will be called CarEventHandler. Here are the initial updates to the Car type: public class Car { // This delegate works in conjunction with the // Car's events. public delegate void CarEventHandler(string msg); // This car can send these events. public event CarEventHandler Exploded; public event CarEventHandler AboutToBlow; ... } Sending an event to the caller is as simple as specifying the event by name as well as any required parameters as defined by the associated delegate. To ensure that the caller has indeed registered with event, you will want to check the event against a null value before invoking the delegate s method set. These things being said, here is the new iteration of the Car s Accelerate() method: public void Accelerate(int delta) { // If the car is dead, fire Exploded event. if (carIsDead) {

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Table 9-1 shows the BlazeDS destinations and adapters in order to use both components. Practically speaking, you can consume a WebService passing it through the BlazeDS server that proxies and fulfills the request.

This screen displays all available security realms on the server. When you select the Add new security realm link, the screen in Figure 10-4 appears.

if (Exploded != null) Exploded("Sorry, this car is dead..."); } else { currSpeed += delta; // Almost dead if (10 == maxSpeed - currSpeed && AboutToBlow != null) { AboutToBlow("Careful buddy! }

Gonna blow!");

// Still OK! if (currSpeed >= maxSpeed) carIsDead = true; else Console.WriteLine("->CurrSpeed = {0}", currSpeed); } } With this, you have configured the car to send two custom events without the need to define custom registration functions. You will see the usage of this new automobile in just a moment, but first, let s check the event architecture in a bit more detail.

Now you will implement the RemotingService on your user manager example application on both the Java and Flex sides.

A C# event actually expands into two hidden public methods, one having an add_ prefix; the other having a remove_ prefix. This prefix is followed by the name of the C# event. For example, the Exploded event results in two CIL methods named add_Exploded() and remove_Exploded(). In addition to the add_XXX() and remove_XXX() methods, the CIL-level event definition associates the correct delegate to a given event. If you were to check out the CIL instructions behind add_AboutToBlow(), you would find code that looks just about identical to the OnAboutToBlow() helper method you wrote previously in the CarDelegate example (note the call to Delegate.Combine()): .method public hidebysig specialname instance void add_AboutToBlow(class CarEvents.Car/CarEventHandler 'value') cil managed synchronized { .maxstack 8 ldarg.0 ldarg.0 ldfld class CarEvents.Car/CarEventHandler CarEvents.Car::AboutToBlow ldarg.1 call class [mscorlib]System.Delegate [mscorlib]System.Delegate::Combine( class [mscorlib]System.Delegate, class [mscorlib]System.Delegate) castclass CarEvents.Car/CarEventHandler stfld class CarEvents.Car/CarEventHandler CarEvents.Car::AboutToBlow ret } As you would expect, remove_AboutToBlow() will indirectly call Delegate.Remove() and is more or less identical to the previous RemoveAboutToBlow() helper method:

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