Method Call Interception in .NET framework

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Method Call Interception
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When a method is called and the context between the calling object and the called object is different, method call interception occurs Examples are transactions and just-in-time activation (JITA) and deactivation (An object is activated and deactivated with every method call) With COM+ 15, the interception is implemented with native code On the other hand, NET components use managed code Often I hear discussions that this can be a performance problem because of COM interop In fact, most times this is not an issue because COM interop is not used with one NET component calling another NET component inside the same Enterprise Services application Actually, the process is shown in Figure 2-3 If both the calling and the called object are written with managed code, the method call happens directly in managed code Of course, the service functionality is implemented by using unmanaged code Here the change from managed to unmanaged code occurs, but this is independent of the parameters that are passed with the method call from object A to object B That's why marshaling of the data to ummanaged code, and unmarshaling to managed code, is not necessary
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Figure 2-3 Method call interception
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Accessing Context Information
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You can access information about the context with the utility class ContextUtil, which has only static properties and methods The static properties of this class are shown in Table 2-1
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Table 2-1 Properties of the Class ContextUtil
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Property ContextId Description Every context has a unique identifier This unique identifier is returned from the property ContextId Activities are used for synchronization A single activity can cross multiple contexts The property ActivityId returns the unique identifier of the activity ApplicationId A NET Enterprise Services application has a unique identifier, the application ID This identifier can be specified with an assembly attribute and can be read with the property ApplicationId Every time the application is started, a new ID for the application instance is created You can read such an ID with the property ApplicationInstanceId With Windows Server 2003, the same application can be offered using multiple configurations This is done with partitions; the property PartitionId returns the ID of the partition Setting DeactivateOnReturn to true means that the done bit of the object should be set, so that the object can be deactivated when the method call returns IsInTransaction transactionId If the object runs inside a transaction,IsInTransaction returns true The unique identifier of the transaction is returned with the property transactionId The transaction property returns an object that represents the DTC transaction This object implements the interface ITransaction MytransactionVote With the property MytransactionVote, you can influence the outcome of the transaction The vote can be set using a value defined with the enumeration TRansactionVote: Abort or Commit IsSecurityEnabled With the read-only property IsSecurityEnabled, you can check whether security is enabled with the COM+ application
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ActivityId
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ApplicationInstanceId
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PartitionId
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DeactivateOnReturn
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Mixing NET and COM+ Contexts
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Contexts have also been available with COM objects running in a COM+ application We discussed earlier that NET components do use NET contexts running in a NET Enterprise Services application What if a NET component is using a COM object that is running within the same application What happens if both objects should participate within the same transaction There is some good news! It can be done, and interoperability plays an important role COM objects do not know about the NET context; only the COM+ context can be used instead To make this possible with NET components, you must take note of the following behavior: When a NET component is created, there is not only a NET remoting context created, but a COM+ context as well This is done with the nondocumented attribute, [ServicedComponentProxy], which is associated with the class ServicedComponent The attribute class ServicedComponentProxyAttribute derives from the class ProxyAttribute With the [Proxy] attribute, you can associate a custom proxy class with your NET remoting class that will be used by NET remoting instead of the default proxy NET Enterprise Services makes use of this feature where the class ServicedComponentProxy takes the role of the proxy to call a NET component running in NET Enterprise Services This proxy makes it possible to introduce both a NET context and a COM+ context The following two subsections examine scenarios where a COM object is called from a NET component, and vice versa
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