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To use this utility, you simply feed the tool the name of the assembly containing classes you need to configure with the /c switch for configure. You can also use /fc if there s a possibility that the application already exists, and you just want to add your types to it. After registration with COM+, the .NET attributes applied to your types will determine the default configuration of the components. You (or an administrator) can always go in and use the MMC snap-in for Component Services to change and further refine them.
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Some Practices Worth Observing
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There are a lot of details to keep in mind when you re using component services. While a comprehensive discussion of the details of contexts, COM Interop, and an exhaustive list of best practices is out of scope for the summary we present in this chapter, we advise you keep some simple things in mind as you move into development in this space.
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Component Design
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First and foremost, create your applications with a stateless design. Don t use field-level information that creates a dependency across method calls. Have each method be truly autonomous and isolated. If and when you need to maintain state, do so in the database, and pass a session ID to the user that he can use to later retain the state information. Don t initialize connections in the constructor of your type to use it from the different methods of your type. Don t assume your user is going to be responsible in the use of your type by creating late, and destroying early; use JITA-enabled components instead. To more explicitly separate the interface of your component from the implementation, you should always create an interface for your Serviced Component to implement. An interface will be created under the hood to represent your class. By default, it will have the name _ClassName. You might as well create your own interfaces, and have your Serviced Component implement them. This means the interfaces listed within COM+ will be known types you ve intentionally created; this will also ease the deployment of metadata if you re using COM+ in a distributed architecture. Do not use static methods on types that inherit from ServicedComponent. These are not designed to work within COM+. Also, always use the ContextUtil and SecurityCallContext to get to the underlying COM+ functionality. Do not call directly into the native COM+ libraries, as the behavior here will be volatile or perhaps merely unpredictable at best. The Enterprise Services assembly has been created with a layer of interoperability specifically designed and optimized for Serviced Components. Use it.
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You generally want to avoid using impersonation. This is true for Component Services, but is more generally true for the middle tier. Impersonation means that a unique user is used to execute the code for each session of the application. There is a security context involved here, and so pooled objects will not be shared across users. This can largely defeat the whole purpose of pooling in the first place. It can actually make things worse, as a pool per user may create far more instances than are actually needed.
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Object Lifetime
As a consumer of Serviced Components, always call Dispose on an instance when you re finished with it. The easiest way to do this is to use the using statement. This guarantees Dispose gets called on the type, regardless of your error-handling semantics. private static void ExPool() { string[] tables = { "authors", "employee", "titles", "publishers","sales" }; Random r = new Random(); using (Poolable p = new Poolable()) { for (int i = 1; i < 10; i++) { string s = string.Format( "select * from {0}", tables[r.Next(tables.Length - 1)]); DataSet ds = p.GetSomeData(s); } } //Dispose called automatically when 'using' goes out of scope } If you re creating Serviced Components you can control instance lifetimes by using JITA (see previous section on JITA). Instead of explicitly calling DeactivateOnReturn from each method implementation, you also have the option of simply flagging your class with the AutoComplete attribute. This attribute will guarantee instances are disposed of after a method completes. If your type is not JITA-enabled, the AutoComplete attribute will be ignored.
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