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Developing the Root and Worker Objects Previously in this chapter, I recommend a design pattern for transactional components. The pattern involves a root object that coordinates the work of other subcomponents. The root object starts the transaction, and the subcomponents do the work. Let's extend our preceding example to use this design pattern. Listing 4-3 shows a namespace called ComTransaction that implements the root object and two worker objects.

Here's the tricky part. If the GUI client is responsible for calling methods on the component, a new transaction starts for each method call because the component is created and destroyed each time. If the first method call succeeds and the second fails, the sales order could be left in an inconsistent state in the database. There are two work arounds for this problem. The first solution is to use the TransactionContext object. This object allows nontransactional clients, such as the GUI application mentioned previously, to control or coordinate the transaction.

Reg contains the entries that would have gone into the Windows Registry. tlb Specifies the destination file for the newly generated COM type library. This switch cannot be used in conjunction with /regfile. /u and /unregister Unregisters any classes that have been registered from this assembly. Let’s go through a simple example to see how this tool is used. NET class. dll. Next, if we look at the resulting type library, we find something similar to the following: Library Animals { CoClass CDog { [default] interface _CDog; interface _Object; }; interface _CDog : IDispatch { HRESULT ToString([out, retval] BSTR* pRetVal); HRESULT Equals([in] VARIANT obj, [out, retval] VARIANT_BOOL* pRetVal); HRESULT GetHashCode([out, retval] long* pRetVal); HRESULT GetType([out, retval] _Type** pRetVal); HRESULT Bark(); } } Let’s start off by examining the CoClass definition of CDog.

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