create and print barcode c# Advanced Topics in .NET

Draw QR in .NET Advanced Topics

Advanced Topics
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The MaxPoolSize argument is the maximum number of objects in the pool; if the pool already contains this number of objects and all of them are serving requests from clients, all subsequent client requests will be queued until an object becomes available. The MinPoolSize argument is the number of objects that COM+ creates when the application starts and that are kept in the pool while the application is running. If client requests exceed this number, COM+ creates additional objects (up to the MaxPoolSize value), but the additional objects are immediately taken out of the pool when they complete their job (more precisely, at the first garbage collection after they complete their job). The ConnectionTimeout argument is the number of milliseconds that a client request waits for an available object; when this timeout expires, the client receives an exception. It is strongly advisable that JIT activation be enabled when object pooling is used; this setting lets the .NET runtime move the object back to the pool as soon as the method returns and the object is deactivated. If a pooled object isn t configured to use JIT activa tion, the object will be put back in the pool only when the garbage collector reclaims it.
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Defining an Initialization String
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In real-world applications, you can rarely hard-code values such a connection string into the component s source code. In 13, you saw that .NET provides a simple way to retrieve these configuration values from the configuration file associated with the assembly. In addition, serviced components can easily retrieve the object construc tor string that the end user has typed in the Activation tab of the component s Properties window. This feature must be explicitly enabled, either by selecting a check box in the MMC snap-in or from code with the ConstructionEnabled attribute at the class level. (This attribute is ignored if the application is already registered in the COM+ catalog.) In both cases, your component retrieves the construction string by overriding the pro tected Construct method inherited from the ServicedComponent base class:
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<ConstructionEnabled(True, Default:="ServerName=.;LogFile:=c:\app.log )> _ Public Class MoneyMover Inherits ServicedComponent Protected Overrides Sub Construct(ByVal s As String) Process the construct string here. End Sub End Class
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The Default optional argument sets the initial construct string and is ignored if the COM+ application is already registered or if the user has typed a different string in the Activation tab of the component s Properties window, as shown in the right portion of Figure 31-5. Typically, the construct string is a semicolon-delimited series of values that you can easily extract by means of a String.Split method or a regular expression pattern.
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31:
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Serviced Components
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Enforcing Role-Based Security
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In a typical enterprise-level application, security can t be an afterthought. Developers should have a clear idea of who can use the object and which actions should be con sidered legal. Robust applications should check the identity of the client trying to use an object (the authentication phase), and they should verify that the client is authorized to perform the specific action (the authorization phase). Implementing authentication and authorization in a robust way used to require a lot of code, until Microsoft released MTS and then COM+. The Component Services snap-in lets administrators define one or more roles for the application and specify which roles can create a given component or invoke one of its methods. The .NET Framework made this process even easier, because you can add a few attributes to your source code to auto matically set a few entries in the COM+ catalog when the application is registered. Let me show you how to enforce COM+ security by using the Component Services MMC snap-in. Right-click on the Roles folder under the BankMoneyMover application, choose the New command, and add a role named Accountants. This command creates a new element, whose Properties window lets you assign a description for the role. Next expand the new Accountants element, right-click on the Users folder, and choose the Add command. This action displays the dialog box shown in Figure 31-6, where you can define which Windows users and groups belong to the COM+ role you ve just defined.
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Figure 31-6
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