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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.

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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;

Figure 5-3. The board that corresponds to the data encoded in Listing 5-6

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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

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Listing 5-6. EncodingUtils.java package net.frog_parrot.dungeon; import net.frog_parrot.util.DataConverter;

interface within a class. When the InstrumentationStrategy sees the IInstrumentationEventProvider interface, it will call the GetInstrumentationEventProvider method to return the object responsible for being the InstrumentationProvider. Listing 4-15. Use of the IInstrumentationEventProvider Interface using using using using System; System.Collections.Generic; System.Text; Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation;

index = 1+3*0 = 1 index = 2+3*1 = 5 index = 0+3*2 = 6 index = 1+3*1 = 4

namespace Sample.SimpleInstrumentationSample { public class MyComponent : IInstrumentationEventProvider { private SomeProvider myProvider = new SomeProvider(); public object GetInstrumentationEventProvider() { return myProvider; } } }

/** * This class contains the data for the map of the dungeon. * This is a utility class that allows a developer to write * the data for a board in a simple format, then this class * encodes the data in a format that the game can use. * * Note that the data that this class encodes is hard-coded. * That is because this class is intended to be used only a * few times to encode the data. Once the board data has been * encoded, it never needs to be encoded again. The encoding

To use the instrumentation features within Enterprise Library, the listener components must be installed on the target computer. These include the performance counter and event log features. Enterprise Library uses a component called ReflectionInstaller, along with the attributes listed here, to assist the .NET InstallUtil.exe file in locating these components for installation: [HasInstallableResource] signals that the listener has installable resources. [EventLogDefinition] defines an event log category to be added. [PerformanceCountersDefinition] defines a performance counter category to be added. InstallUtil.exe looks for the HasInstallableResource attribute, and then installs the corresponding event log and/or performance counter categories. Listing 4-16 takes the SomeListener class in Listing 4-14 and adds the appropriate attributes so it can log to the event log. Listing 4-16. Adding Event Log Features to Listener Class using System; using System.Collections.Generic; using System.Diagnostics;

Caution Array indexes are 0-based; for example, the first element of array is array[0], and the last

using System.Text; using Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation; namespace Sample.SimpleInstrumentationSample { [HasInstallableResourcesAttribute] [EventLogDefinition("Application", "My Component")] public class SomeListener { [InstrumentationConsumer("StartMe")] public void Started(object sender, EventArgs e) { EventLog.WriteEntry("My Component", "Component Started", EventLogEntryType.Information); } } } As noted earlier, Enterprise Library has all the instrumentation turned off by default. So if you do not want to use instrumentation, you don t need to install the listener components. Therefore, you can make simple Xcopy deployments.

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