crystal reports 2013 qr code 2: Using a LifecycleCoordinator with Separate State Coordinators in Font

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Example 2: Using a LifecycleCoordinator with Separate State Coordinators
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Many applications are substantially more complicated than the one described in the previous section. In the next example, I ll show how a fairly complex application might benefit from the state management of a LifecycleCoordinator. Each life-cycle state is associated with a separate dedicated coordinator. The application displays a splash screen while the main form is loading. The splash screen contains a
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CHAPTER 10 FUNCTIONAL ROLES
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message area and a progress bar to provide initial feedback to the user about the load process. The splash screen looks like Figure 10-22.
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Figure 10-22. The splash screen used in the example The design uses a main LifecycleCoordinator, which in turn uses three separate coordinators to manage the details of the Startup, Running, and Shutdown states. The system s coupling diagram is shown in Figure 10-23.
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FormSplash +UpdateProgress()
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StartupCoordinator +Run()
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LifecycleCoordinator +Main() +Run() BuilderBinder
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+BuildBasicUi() +BindInfrastructure() +BuildRemainderOfApp()
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RunCoordinator
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+Run()
FormMain +UpdateProgress() +StatusBarMessage()
ShutdownCoordinator +Run()
Figure 10-23. The coupling diagram of the system The Startup state has three substates: NoUi, Splash, and NormalUi. When the system first starts, no UI is available, so no user feedback can be given to the user. The splash screen is a very simple form, so its setup time is negligible and the screen appears almost immediately. You use the screen to show feedback during the rest of the initialization phase. A skeletal UI is then loaded, consisting of a plain form with a status bar for text and progress feedback. This form is the main form of the application but may not yet contain all the final UI elements, such as menus, toolbars, and other content. Those elements might be loaded later if they take a long time to set up. As soon as the skeletal UI loads, the splash screen is removed and feedback messages are sent to the new UI. The coordinators for the Running and ShutDown states don t have any substates in this example, to keep the code simple. Listing 10-13 and Listing 10-14 show C# and VB .NET implementations. Listing 10-13. A C# Implementation Using Separate Lifecycle State Coordinators public class LifecycleCoordinator { // The main entry point for the application [STAThread] static void Main()
CHAPTER 10 FUNCTIONAL ROLES
{ LifecycleCoordinator coordinator = new LifecycleCoordinator(); coordinator.Start(); // app exits when this call completes } enum LifecycleState {StartingUp, Running, ShuttingDown}; LifecycleState state; // shortcut property BuilderBinder BuilderBinder { get {return BuilderBinder.Singleton;} } public void Start() { StartupSystem(); RunSystem(); // app exits when this call completes } void StartupSystem() { state = LifecycleState.StartingUp; BuilderBinder.startup.Run(); } void RunSystem() { state = LifecycleState.Running; BuilderBinder.running.OnExiting += new RunCoordinator.ExitingHandler(ShutDownSystem); BuilderBinder.running.Run(); // app exits when this call completes } void ShutDownSystem() { state = LifecycleState.ShuttingDown; BuilderBinder.shutdown.Run(); } public void { // ignore if (state if (state HandleWorkerEvent() worker events unless in the Running state == LifecycleState.StartingUp) return; == LifecycleState.ShuttingDown) return;
// handle the event... } }
CHAPTER 10 FUNCTIONAL ROLES
public class BuilderBinder { static BuilderBinder singleton; static public BuilderBinder Singleton { get { if (singleton == null) singleton = new BuilderBinder(); return singleton; } } public FormSplash formSplash = new FormSplash(); // lifecycle state coordinators public StartupCoordinator startup = new StartupCoordinator(); public RunCoordinator running = new RunCoordinator(); public ShutdownCoordinator shutdown = new ShutdownCoordinator(); // the app's main form public FormMain formMain; // private constructor, to force access through Singleton property private BuilderBinder() { } public void BuildBasicUi() { // create all the top-level objects formMain = new FormMain(); } public void BuildInfrastructure() { int progress = 20; for (int i = 0; i < 5; i++) { // simulate a lengthy load process... System.Threading.Thread.Sleep(1000); // provide completion feedback FireProgressChangedHandler(progress); progress+= 20; } } public void BuildRemainderOfApp() { for (int i = 1; i <= 10; i++) { // simulate a lengthy operation System.Threading.Thread.Sleep(500);
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