Using Construction Strings in Visual Studio .NET

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Listing 2-9 Using Construction Strings
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[ConstructionEnabled(Default=@"C:\temp")]
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[EventTrackingEnabled] public class CoursesComponent : ServicedComponent { private string path; public CoursesComponent() { }
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protected override void Construct(string s)
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{ path = s; }
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private void CreateFile() { string uniqueName = GuidNewGuid()ToString(); writer = new StreamWriter(path + @"\Courses " + uniqueName + "txt"); } //
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The construction string can be changed by the system administrator with the Component Services Explorer by selecting the Activation tab with the component configuration, as shown in Figure 2-12 In this dialog box, you can see the informal message not to store security-sensitive information here Where security-sensitive information can be stored is discussed in 12
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Figure 2-12 Object construction string enabled
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Instead of using this tool, you can create a custom application to maintain the application Creating admin components for such a task is shown in 13, "Development and Configuration"
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Just-in-Time Activation (JITA)
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JITA is a feature to reduce the load of the server With a JITA-enabled component, the object lifetime is independent of the client using the object The server component itself decides when the object should be deactivated by setting a done bit If a client invokes a method with an object that was already deactivated, a new object is created and activated The object is deactivated on choice of the server component, and a new instance is automatically activated when the client invokes the next method using the same reference to the server component With JITA components, it is important to pay attention to the state of the object After deactivation, the state is lost With the next method call using the same reference by the client, a newly initialized object is used The sample component shown in Listing 2-10 demonstrates exactly this issue: how state can be kept with JITA objects, and when state will be lost Listing 2-10 shows the class CoursesComponent, which has been changed to use JITA JITA is enabled by applying the attribute [JustInTimeActivation] to the class The class JustInTimeActivationAttribute also has a constructor with a Boolean argument where JITA can be enabled or disabled, but the default is to enable JITA For JITA, two methods from the base class ServicedComponent should be overridden: Activate and Deactivate Activate is called by the runtime after the object is instantiated In this example, the member variable writer is initialized to write to a newly created fileDeactivate is called by the runtime before the object is destroyed Here the stream is closed The calls to the methods CreateFile and CloseFile have been removed from the Order method, because the invocation of these methods is now put into the overridden methodsActivate and Deactivate With the method Order, the attribute [AutoComplete] method is added By applying this attribute, the done bit of the object will be set, and the object will be deactivated after the method call completes
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Listing 2-10 Serviced Component Class with Just-In-Time Activation
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[JustInTimeActivation()]
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[ConstructionEnabled(Default=@"C:\temp")] [EventTrackingEnabled] public class CoursesComponent : ServicedComponent, ICourseOrder { private StreamWriter writer = null; private string path; public JitaDemo() { } // Creates and opens a unique file private void CreateFile() { string uniqueName = GuidNewGuid()ToString(); writer = new StreamWriter(path + @"\Courses " + uniqueName + "txt");
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks } private void CloseFile() { writerClose(); }
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protected override void Activate() { // init object CreateFile(); } protected override void Deactivate() { CloseFile(); } [AutoComplete]
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public void Order(string xmlOrder) { XmlDocument doc = new XmlDocument(); docLoadXml(xmlOrder); XmlNodeList courses = docGetElementsByTagName("Course"); foreach (XmlNode nodeCourse in courses) { XmlElement xmlCourse = nodeCourse as XmlElement; if (xmlCourse != null) { string courseNumber = xmlCourseGetAttribute("Number"); string title = GetText(xmlCourse, "Title")[0]; DateTime date = DateTimeParse( GetText(xmlCourse, "StartDate")[0]); string[] attendees = GetText(xmlCourse, "Attendee"); for (int i = 0; i < attendeesLength; i++) { WriteToFile(courseNumber, title, date, attendees[i]); } } } } // }
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You can set the done bit of the component in two ways: by applying the attribute [AutoComplete] as you have seen, or programmatically by using the utility class ContextUtil to set the property DeactivateOnReturn to true Both ways for object deactivation are shown in Listing 2-11 If both the attribute and the property DeactivateOnReturn are used inside a method,DeactivateOnReturn overrides the setting defined by the attribute
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