vb.net generate barcode 128 A-10. Life Cycle Control Properties of the ServiceBase Class in Visual Basic .NET

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Table A-10. Life Cycle Control Properties of the ServiceBase Class
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Property Description CanHandlePowerEvent Defines whether the service can handle notifications of changes to the computer power status via the OnPowerEvent method. CanPauseAndContinue Defines whether the service can be paused and resumed via the OnPause and OnContinue methods.
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Appendix A. Platform Integration
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Defines whether the service should be notified prior to system shutdown via the OnShutdown method. This is useful if the service needs to store data or state before being terminated. Defines whether the service can be stopped via the OnStop method once it has been started.
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The SCM controls the operation of a service via a set of methods inherited from ServiceBase. However, the SCM will call only those methods that the service has indicated it supports via the properties just discussed. Each of these methods is summarized in Table A-11.
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Table A-11. Life Cycle Control Methods of the ServiceBase Class
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Descirption Method called by the SCM to make the service resume processing after being paused. Invoked only if the CanPauseAndContinue property is true. OnCustomCommand() Allows the SCM control mechanisms to be extended to support custom commands. OnCustomCommand takes an integer argument that can be used by the service to determine the appropriate action to take. Method called by the SCM to make the service pause any processing. OnPause() Invoked only if the CanPauseAndContinue property is true. Method called when a system-level power status change occurs, such OnPowerEvent() as a laptop going into suspend mode. Method called when the system is being shut down. Invoked only if OnShutdown() the OnShutdown property is true. Method called by the SCM to start the service. Receives a String array OnStart() of arguments. All services should override the OnStart method. No lengthy processing should be carried out in the OnStart method; the SCM expects it to return within 30 seconds. Method called by the SCM to halt the service. Invoked only when the OnStop() CanStop property is true. We override the OnStart method to initiate the functionality of the service; we also override the OnStop, OnPause, and OnContinue methods because the CanStop and CanPauseAndContinue properties are set to true. In the example, we use methods of the Thread class to start, abort, suspend, or resume the operation of the logging thread in response to each SCM message. Finally, in the Main method, references to the new BeaconService instances are placed in a ServiceBase array and passed as an argument to the static ServiceBase.Run method. The Run method calls the SCM and passes it the references to the two services.
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Event Logging
The ServiceBase class provides support for automated event logging. If the inherited AutoLog property is set to true (the default value), the ServiceBase constructor creates a System.Diagnostics.EventLog. The EventLog.Source property is set to the ServiceName of the
Appendix A. Platform Integration
service and is registered against the Application log. See the "Windows Event Log" section earlier in this appendix for details. The service will automatically log events when the OnStart, OnStop, OnPause, or OnContinue method of the service is invoked. The EventLog instance can be obtained using the inherited EventLog property and can be used to write additional entries to the event log; however, if there is a need to write to a log other than the Application log, the AutoLog property should be set to false and the service itself should implement the necessary event-logging functionality.
Service Installer
Services cannot be executed like other assemblies; the tight integration with the operating system and the configuration information held in the Windows registry requires that they be explicitly installed. A service installer class must be developed and compiled into the assembly containing the service class. Once the installer class is compiled, the Installer Tool (installutil.exe) provided with the .NET SDK is used to install the service. An installer class must
Derive from the System.Configuration.Install.Installer class. Be annotated with the RunInstaller(true) attribute. Create and configure a System.ServiceProcess.ServiceProcessInstaller instance to describe the service application. Create and configure System.ServiceProcess.ServiceInstaller instances to describe each of the individual contained services. Add the ServiceProcessInstaller and ServiceInstaller instances to the InstallerCollection exposed through the inherited Installers property.
Note that a Main method is not required; the installutil tool instantiates the installer, so all logic should be contained in the instance constructor. The following code provides an installer for the BeaconService service:
using System.ServiceProcess; using System.Configuration.Install; using System.ComponentModel; [RunInstaller(true)] public class BeaconServiceInstaller : Installer { // Create a ServiceProcessInstaller for each application private ServiceProcessInstaller BeaconProcess = null; // Create a ServiceInstaller instance for each // service contained in the application private ServiceInstaller BeaconLogService1 = null; private ServiceInstaller BeaconLogService2 = null;
Appendix A. Platform Integration public BeaconServiceInstaller() { // Instantiate and configure the ServiceProcessInstaller BeaconProcess = new ServiceProcessInstaller(); BeaconProcess.Account = ServiceAccount.LocalSystem; // Instantiate and configure the ServiceInstaller for the // First Event Log Beacon BeaconLogService1 = new ServiceInstaller(); BeaconLogService1.DisplayName = "Log Beacon 1"; BeaconLogService1.ServiceName = "LogBeacon1"; BeaconLogService1.StartType = ServiceStartMode.Automatic; // Instantiate and configure the ServiceInstaller for the // Second Event Log Beacon BeaconLogService2 = new ServiceInstaller(); BeaconLogService2.DisplayName = "Log Beacon 2"; BeaconLogService2.ServiceName = "LogBeacon2"; BeaconLogService2.StartType = ServiceStartMode.Automatic; // Add the installers to the Installers collection Installers.Add(BeaconLogService1); Installers.Add(BeaconLogService2); Installers.Add(BeaconProcess); } }
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