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An event is a detectable condition that can trigger a notification.
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A notification is an event-triggered signal sent to a run-time defined recipient.
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CHAPTER 2 EVENTS AND NOTIFICATIONS
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The condition that is associated with an event might be based on any number of predicates for example, that today is Tuesday, that the time is 10:30 a.m., or that my cat licked his left front paw for the seventh time in the last five minutes. The detection of the condition must be associated with a notification. Software systems detect all sorts of conditions. Of all those conditions, the only ones I ll call events are those that can trigger a notification. Let s analyze a bit more what is and is not in the definitions. For starters, a condition must be detectable to be called an event. For example, consider the following C# code snippet: void DoSomething() { for (int x = 0; x < 10; i++) Console.Out.Write("hello"); } The loop prints a string 10 times to the output console. For each iteration, the control variable x has a different value. According to the definition of event, can you consider the condition in which x assumes the value 3 to be an event No, because the condition is not detectable in the code. When x assumes the value 3, nothing special happens. Let s add some code to detect the condition: void DoSomething() { for (int x = 0; x < 10; x++) { if (x == 3) Console.Out.Write("hello"); } } Is the condition an event now The answer is still no. Although the condition is detectable, no notification mechanism is associated with the condition. The code prints a string, but it doesn t use a notification to do so. The call to Console.Out.Write is not a notification, because the callee is identified at compile time. The caller always knows who the callee is. Let s change the code again: public delegate void Updater(string theMessage); public Updater xHasValueThreeHandler; void DoSomething() { for (int x = 0; x < 10; i++) { if (x == 3) if (xHasValueThreeHandler != null) xHasValueThreeHandler ("Third iteration"); } } Now you can say that the condition (in which x assumes the value 3) is an event. The previous code introduced a new delegate type named Updater. In C#, delegates are basically pointers to methods. The code uses the type Updater to define a field called xHasValueThreeHandler. You can initialize this field at run time to point to any method of any class, as long as the method accepts a single string parameter and returns void. At compile time, there s no way to know if xHasValueThreeHandler will point to a method or not, so you must test the field before using it to ensure that it has been initialized to point to something. When the event is detected, a notification is sent in the form of a call to the method pointed at by xHasValueThreeHandler, if such a method exists.
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CHAPTER 2 EVENTS AND NOTIFICATIONS
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Let s look at notifications in more detail. A notification is essentially a signal sent when an event occurs. The signal can be sent in two basic ways: by transferring data or by transferring execution control. When the signal transfers data, the signal is a message written to a resource that is shared by the sender and receiver. The shared resource might be a network connection, shared memory, an OS service, a pipe, a computer, or something else. The message can be anything from a single value to a formatted message with fields describing the event. The fields might include a sender identifier, a message identifier, a time stamp, a priority value, or other information related to the event. In order for the notification to have an effect, the receiver must monitor the shared resource and be able to detect any new data written to it. When the signal transfers execution control, the signal is sent as a procedure call. Depending on the relative locations of the sender and receiver, the procedure call might be local or remote. The signal is the call itself, with optional data passed as parameters or returned values. Figure 2-1 shows the steps involved in the production of a notification:
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