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Objects in tile-based games are aware of their environment. They know whether they re on a platform, in the sky, or next to a wall. This means that you can create general rules about how enemies behave. You can program objects to always change direction when they hit a wall, to jump over lava pits, or take to the air if they reach the edge of a cliff. If you program your objects carefully, they will be able to make autonomous decisions about how to behave depending on the kinds of environmental obstacles that are in their way. You can create completely new game maps and drop your objects in to watch how they behave. A simple example of this wind them up and let them loose effect is in the Enemies folder. A hedgehog enemy moves back and forth across the platform, and the elevator moves up and down between two levels of platforms, as shown in Figure 8-23.

The Instrumentation namespace employs an event-based architecture that separates the code that calls the event from the code that actually performs the action. Instrumentation uses the following three attributes to support this model: [InstrumentationListener] defines which listener class to instantiate. [InstrumentationConsumer] determines which methods will respond to events. [InstrumentationProvider] determines which consumer method in the listener class to execute.

Figure 8-23. The hedgehog and elevator make decisions about where to move based on their changing environment.

The InstrumentationProvider attribute determines which method to call by matching the name given in the corresponding InstrumentationConsumer. Listing 4-14 demonstrates a simple implementation of this. Listing 4-14. Simple Instrumentation Example using using using using System; System.Collections.Generic; System.Text; Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation;

Implementing the Decorator pattern is appropriate because, as you saw in the Architecture section, when implementing static HTTP validation it is necessary to save content to a file and the database The file was consumed by the HTTP server, and the database for the application So a calling sequence could be first saving to a file and then saving to the relational database The Decorator pattern masks these two steps as one The client thinks only one call is being made The underlying Decorator pattern implementation handles the details of chaining together the various action set interface implementations The following example classes implement the static HTTP validator, which saves to a file and a database.

Neither object has been preprogrammed to move between specific map cells. Instead, they re sensing where they are in the world and making a decision to act when their environment changes. The hedgehog doesn t like heights. Whenever it reaches the edge of a platform, it gets spooked and reverses direction. But how does it know it s on the edge of a platform Our code needs to find some way of describing this boundary. Look carefully at Figure 8-23, and you ll notice that this isn t too hard to figure out. When the tile in the row below the hedgehog becomes SKY, we know the hedgehog has reached the end of the platform. Check this for both the hedgehog s left and right side, and reverse the velocity if this turns out to be true. Figure 8-24 illustrates this logic.

namespace Sample.SimpleInstrumentationSample { public class SomeListener { [InstrumentationConsumer("StartMe")] public void Started(object sender, EventArgs e) { //perform some action } } [InstrumentationListener(typeof (SomeListener))] public class SomeProvider { [InstrumentationProvider("StartMe")] public event EventHandler<EventArgs> OnStart; } } In Listing 4-14, when SomeProvider is instantiated by ObjectBuilder, it will examine the class type provided in the InstrumentationListener attribute. (ObjectBuilder is detailed later in this chapter.) If the class is found, it will instantiate that class. Then all of the events with the InstrumentationProvider attribute are associated with their respective counterparts in the SomeListener class. In this case, the OnStart event in the SomeProvider class is associated with the Started method in the SomeListener class. A typical application consists of many components. This can include web services, data access logic, business logic, user interface components, and so on the list can go on forever. It is usually considered better for these components themselves, rather than the application, to call their respective instrumentation providers. The Instrumentation namespace provides an interface called IInstrumentationEventProvider to allow a component to delegate the instrumentation to another component. To invoke this feature, ObjectBuilder must be used with the InstrumentationStrategy during the creation phase of an object. By default, Enterprise Library uses InstrumentationStrategy during the object creation and initialization process via ObjectBuilder. Listing 4-15 shows the use of the IInstrumentationEventProvider