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Use of the assignment operator clears out all previous subscribers and allows you to replace them with new subscribers This is an unfortunate characteristic of a delegate It is simply too easy to mistakenly code an assignment when, in fact, the += operator is intended The solution, called events, appears in the Events section, later in this chapter It should be noted that both the + and operators and their assignment equivalents, += and -=, are implemented internally using the static methods SystemDelegateCombine() and SystemDelegateRemove() Both methods take two parameters of type delegate The first method, Combine(), joins the two parameters so that the first parameter points to the second within the list of delegates The second, Remove(), searches through the chain of delegates specified in the first parameter and then removes the delegate specified by the second parameter One interesting thing to note about the Combine() method is that either or both of the parameters can be null If one of them is null, then Combine() returns the non-null parameter If both are null, then Combine() returns null This explains why you can call thermostatOnTemperatureChange += heaterOnTemperatureChanged; and not throw an exception, even if the value of thermostatOnTemperatureChange is not yet assigned

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Sequential Invocation Figure 131 highlights the sequential notification of both heater and cooler Although you coded only a single call to OnTemperatureChange(), the call is broadcast to both subscribers so that from that one call, both cooler and heater are notified of the change in temperature If you added more subscribers, they too would be notified by OnTemperatureChange() Although a single call, OnTemperatureChange(), caused the notification of each subscriber, the subscribers are still called sequentially, not simultaneously, because a single delegate can point to another delegate that can, in turn, point to additional delegates

public static T CompareExchange <T>( T location, T value, T comparand );

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An example of its use with the new facility is shown below: Robot denseRobot = new Robot(6, 5); This line of code declares an object denseRobot which is created by applying new to the Robot method This method requires two arguments (in the example above these are 6 and 5) which are used to update the x and y instance variables within denseRobot 322 Messages and classes It is worth recapping the mechanisms used within Java for sending messages and what happens to these messages When the Java interpreter encounters an expression such as: receiverObjectmessage(arguments); it will first determine which class the destination object is defined by To do this it will scan all the declarations within the code of the applet or Java application If it finds the name of the object within a declaration then it recovers the name of the class which describes it It will then scan the code of the methods associated with this class If it finds a method with the same name as the message string then the code is executed; if not an error is flagged If the message is associated with any arguments these are copied through as the arguments of the method and the code associated with the method is executed This is a slight simplification as you will see later in this chapter However, in essence, it represents the processing cycle that occurs

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2 : Thermostat() Thermostat : Thermostat 3 : Heater(temperature) _heater : Heater 4 : Cooler(temperature) OnTemperatureChange delegate TemperatureChangeHandler 5 : operator+= _cooler : Cooler

6 : operator+= 7 : Write("Enter temperature:") 7 : ReadLine() 9 : CurrentTemperature(value) 10 : OnTemperatureChange(value) 11 : OnTemperatureChanged(newTemperature) 12 : WriteLine("Heater off")

public static T Exchange<T>( T location, T value );

OnTemperatureChanged( ) 13 : OnTemperatureChanged(newTemperature) 14 : WriteLine("Cooler on")

public static int Decrement( ref int location );

OnTemperatureChanged( ) OnTemperatureChange( ) CurrentTemperature( )

ADVANCED TOPIC Multicast Delegate Internals To understand how events work, you need to revisit the first examination of the SystemDelegate type internals Recall that the delegate keyword is an alias for a type derived from SystemMulticastDelegate In turn, SystemMulticastDelegate is derived from SystemDelegate, which, for its part, comprises an object reference and a method pointer (of type SystemReflectionMethodInfo) When you create a delegate, the compiler automatically employs the SystemMulticastDelegate type rather than the SystemDelegate type The MulticastDelegate class includes an object reference and method pointer, just like its Delegate base class, but it also contains a reference to another SystemMulticastDelegate object When you add a method to a multicast delegate, the MulticastDelegate class creates a new instance of the delegate type, stores the object reference and the method pointer for the added method into the new instance, and adds the new delegate instance as the next item in a list of delegate instances In effect, the MulticastDelegate class maintains a linked list of Delegate objects Conceptually, you can represent the thermostat example as shown in Figure 132

public static int Increment( ref int location );

+ property Temperature : float + OnTemperatureChanged( )

Adds value to location and assigns location the result public static int Add( ref int location, int value );

+ property Temperature : float + OnTemperatureChanged( )

To describe the main data types within the Java language To describe the main control structures within the Java language To present some examples of Java code

+ property Temperature : float + OnTemperatureChanged( )

Returns a 64-bit value in a single atomic operation public static long Read( ref long location );

+ property Temperature : float + OnTemperatureChanged( )

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