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Serviced Components
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A serviced component, according to Microsoft s definition, is a class that is authored in a CLS-compliant language and that derives directly or indirectly from the SystemEnterpriseServicesServicedComponent class This means that the
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26: Windows Services
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class can be hosted by a COM+ application and can use COM+ services A serviced component can take advantage of context sharing between COM+ and NET Framework classes COM+ services used to be hosted by Microsoft Transaction Server (MTS) and provided robust enterprise services to applications In other words, using COM+ services made your application a multi-tiered application in which the following parts worked together: Front-end application programs (user-interface applications) made calls to a component hosted by MTS on a server COM+ services responded to the call and provided middle-tier functionality Calls were made from the middle-tier service to the back-end database The database returned the information to the service, which, in turn, returned the result to the front-end application COM+ services added the following robust features to middle-tier functionality: Database transaction handling, which wraps database commands in a transaction that cause an all or nothing transaction See 10 on data handling for transaction properties (ACID) Security, meaning that restrictions on who has access to the component can be enforced Object pooling, which allows multiple users of the component to access a single instance of the component Components are pooled (instantiated and left to wait for calls), and that saves time on the server side of the call In order to create an environment whereby the developer can take advantage of NET Framework objects and COM+ services working together, you need to understand the architecture of a COM+ application hosting serviced components Figure 26-11 shows the two environments and the boundaries created between them Services can flow between NET objects and COM+ services Each environment is responsible for the implementation and the execution of the object, but COM+ provides the context for the object: transaction control, pooling, and so on EXAM TIP COM+ services include automatic transaction handling, JIT object activation, security, object pooling, message queuing, and load balancing There are three remaining services: JIT object activation COM+ services will deallocate memory occupied by objects when they are not being used and will bring them back to life when needed
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Figure 26-11
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NET Framework and COM+ services
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Message queuing COM+ services will deal with queuing messages that may not be received by resources (for example, if a database server crashes and doesn t respond for a while) The queuing service records the method calls so that they can be played back when the target server responds Load balancing COM+ services will distribute object calls across a farm of servers, thereby keeping one or more servers from becoming congested
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Building a Serviced Component
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The NET Framework, as we have seen, uses COM+ to provide runtime services to NET components Services include transaction handling, object pooling, JIT activation, and so forth Three pieces work together to provide this functionality: Enterprise service A COM+ service that is exposed through the SystemEnterpriseServices namespace Serviced component Serviced assembly component A NET class that will use the enterprise service A NET assembly that contains at least one serviced
Let s build a class as a serviced component: 1 Start a new project using the Console Application template and add a reference to SystemEnterpriseServicesdll Right-click on the project and select Add Reference from the menu The Add Reference dialog box will open, as
26: Windows Services
shown next Double-click the SystemEnterpriseServices component and click OK
2 Set your class to inherit from SystemEnterpriseServicesServicedComponent:
public class MyServicedComponent: SystemEnterpriseServicesServicedComponent
3 Add a constructor to your class, like this:
public MyServicedComponent() { }
4 Specify the attributes that will work with the COM+ services In order to do this, you need to add attributes to the AssemblyInfocs file (Review 6 if you are unsure of how to do this) The following code listing gives you an example:
[assembly: ApplicationName("MyServicedApplication")] [assembly: Description("My First Serviced Application")]
The attributes that are available within the SystemEnterpriseServices namespace are listed in Table 26-3 In the table, you will see the scope value that specifies whether the attribute belongs to the method, the class, or the assembly You will also see the unconfigured default value, which represents the value that COM+ assigns to the field if the attribute is omitted from your code The configured default value is the value
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