data matrix code generator c# COM+ Applications in Visual C#.NET

Creation Data Matrix in Visual C#.NET COM+ Applications

COM+ Applications
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Classes are deployed into COM+ using the abstraction of an application. A COM+ application can be thought of as simply an aggregation of configured classes that share run-time requirements. Once configured within COM+, these classes are also called components. Components are aggregations of interfaces, and interfaces are aggregations of methods. Aspects of the run-time behavior that can be controlled at the application level will be shared across all components, all the way down to the method level. Some aspects can be added or overridden at each level in the hierarchy. The most important configuration aspects at the application level are security and activation. Security controls what identity the components run under. When deciding what components should be grouped in an application, consider that cross-application calls can cross a security boundary, so you should logically group them for optimum performance.
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Activation is the other prominent aspect. This aspect controls whether components are created in their own process, or whether they are created in the process of their caller. Applications created in their own process are called server applications, and while calling these components incurs the performance hit of crossing a boundary, you also gain the benefits of isolation. This can affect pool allocation and the identity of the process. Applications created in the process of the caller are called library applications. They lose the capability to specify their run-time identity, as they will run under the identity of their caller. They will also have pools created for each application from which they re invoked (see 8 for more details of library versus server applications). When you re creating Serviced Components, you can control these aspects of a COM+ application using assembly level attributes (these attributes can be found in AssemblyInfo.cs in the Serviced project). [assembly: ApplicationName("Serviced")] [assembly: ApplicationAccessControl(false)] [assembly: ApplicationActivation(ActivationOption.Library)] These attributes are then read via reflection and applied when the component is being configured. We ll examine configuration more closely after we look at the specific features you can leverage from within Component Services.
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This feature (abbreviated as JITA), enables an instance of an object to survive for the span of only a single method call. Even if a consumer of this type holds a reference to an instance of it for a long period of time, instances will only be created when the consumer actually calls a method. JITA is configured on a class using the JustInTimeActivation attribute, as in the following class declaration. [JustInTimeActivation(true)] public class JITA : ServicedComponent { //Class Implementation } The only other thing necessary to have COM+ destroy the object after a call is to apply the DeactivateOnReturn attribute. To illustrate the effect JITA has on object lifetimes, examine it via this simple service method. (This class can be found in the Serviced project of the Code07 solution.) //[JustInTimeActivation(true)] public class JITA : ServicedComponent { private DateTime m_CreateStamp; public JITA() { m_CreateStamp = DateTime.Now(); }
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public DateTime GetCreateStamp() { //ContextUtil.DeactivateOnReturn = true; return m_CreateStamp; } } Notice the JITA specific code is commented out. Now exercise this code with the following loop, and examine the output it generates. (You can find test code in the TestHarness project of the Code07 solution.) static void Main(string[] args) { JITA j = new JITA(); for (int i = 0; i < 5; i++) { Console.WriteLine(j.GetCreateStamp()); Thread.Sleep(3000); } Console.ReadLine(); } With the JITA attribute commented out, the dates on the output all match (see Figure 7-4). This makes sense, because the consumer is holding a reference to the same instance across all calls, and so the object is only created a single time.
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Figure 7-4. The timestamp matches across all method calls without JITA. Look at what happens if you remove the comments around the JITA-specific code and rerun the client (see Figure 7-5). Now, obviously the churn involved in object creation and destruction will, in most cases, consume the benefit gained by not keeping extraneous instances around between a client s method calls. For this reason, JITA usually makes the most sense when it s combined with object pooling. We ll take a look at object pooling in the next section.
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