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Using a New Activity
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Now take a look at a small example using these classes In the example shown in Figure 3-7, the class SyncDemo implements the interface IServiceCall You can use classes with these interfaces with the methodsSynchronousCall and AsynchronousCall of the class Activity The interface just defines a single method OnCall, where you can implement the work that needs to be done and that requires an activity
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Listing 3-7 Implementing the Interface IServiceCall
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class SyncDemo : IServiceCall { public void OnCall() { ConsoleWriteLine("OnCall started"); ConsoleWriteLine("running in the activity: {0}", ContextUtilActivityId); ConsoleWriteLine("running in an {0} thread", ThreadCurrentThreadApartmentStateToString()); SystemThreadingThreadSleep(3000);
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ConsoleWriteLine("OnCall finished"); } }
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Listing 3-8 shows a client application using this class TheMain method of the application is marked with the attribute [STAThread], so that the main thread joins a single-threaded apartment You can change this to [MTAThread]; as soon as you join one apartment type, however, you have to stay within it In the Main method, an object of type ServiceConfig is created to set the context requirements for the activity To use an MTA thread for the SyncDemo object, you set the ThreadPool property to THReadPoolOptionMTA The Synchronization property is set to SynchronizationOptionRequired, so this is a request to use the synchronization service Now you can create a new activity by passing the config object to the constructor of theActivity class The work to be done inside the activity is passed to the methods AsynchronousCall and SynchronousCall of the activity object Because of the required synchronization, these methods will not overlap, although they do run on different MTA threads of the pool
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Listing 3-8 Client Application Using Services Without Components
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class Test { [STAThread] static void Main(string[] args) { ServiceConfig config = new ServiceConfig(); configThreadPool = ThreadPoolOptionMTA; configSynchronization = SynchronizationOptionRequired; Activity activity = new Activity(config); SyncDemo serviceCall = new SyncDemo(); ConsoleWriteLine("starting the first async call"); activityAsynchronousCall(serviceCall); ConsoleWriteLine("starting the second async call"); activityAsynchronousCall(serviceCall); ConsoleWriteLine("starting the synchronous call"); activitySynchronousCall(serviceCall); } }
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The console output of the application demonstrates that the three method calls do not overlap, and the activity ID shown for all these methods is the same starting the first async call starting the second async call starting the synchronous call OnCall started running in the activity: 2c383439-0b7944e0-8ccc-acb214f3d904 running in an MTA thread OnCall finished OnCall started
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running in the activity: 2c383439-0b7944e0-8ccc-acb214f3d904 running in an MTA thread OnCall finished OnCall started running in the activity: 2c383439-0b7944e0-8ccc-acb214f3d904 running in an MTA thread OnCall finished
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Changing the Synchronization property to the value Synchronization-OptionNotSupported, you can see that the methods run concurrently, and there is no activity starting the first async call example, shown in figure starting the second async call starting the synchronous call OnCall started running in the activity: 00000000-00000000-0000-000000000000 running in an MTA thread OnCall started running in the activity: 00000000-00000000-0000-000000000000 running in an MTA thread OnCall started running in the activity: 00000000-00000000-0000-000000000000 running in an MTA thread OnCall finished OnCall finished OnCall finished
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Starting a New Context
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Creating and using a new context with the ServiceDomain class is demonstrated in Listing 3-9 Here the required context properties are defined with the ServiceConfig class, where the Synchronization property is set to Synchronization-OptionRequired The context is created by using ServiceDomainEnter, and the ID of the activity is accessed with theContextUtil class Inside this context, a new context is created with ServiceDomainEnter Because the same properties for the context are passed, no new activity will be created Before a third context is entered, the Synchronization property of the newly to be created context is changed to SynchronizationOptionRequiresNew, which will create a new activity Finally, for every call to ServiceDomainEnter, a call to ServiceDomainLeave must be done
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