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You ll notice that the destructor only got called once, and the finalizer got called six times The destructor was for the object created in MakeObjects with stack semantics when the object went out of scope The destructor is not called for a handle type that is not explicitly deleted The finalizer was called when the garbage collection ran (which in this case was forced by calling GC::Collect) If you have a finalizer that does something important, you ll want your destructor to call your finalizer to make sure that the cleanup operations occur promptly rather than waiting until a garbage collection cycle occurs A destructor call suppresses the finalizer Now try removing the call to GC::Collect and rerunning the program The finalizer is still called six times even though the process may have shut down Finalizers will be run when the process ends.

Listing 11 1. Main Function to Create Binary File using System; using System.IO; using System.Runtime.Serialization.Formatters.Binary; using Microsoft.BizTalk.Bam.EventObservation; // etc. static void Main(string[] args) { // the following creates a new instance based on the definition that // has been deployed to Tracking. If BAMApiPo does not exist as a valid // deployed definition, this code will fail. ActivityInterceptorConfiguration interceptorConfig = new ActivityInterceptorConfiguration("BAMApiPo"); // registrations map the name of the tracked event to the // name that is in the binary file/Interceptor code. interceptorConfig.RegisterDataExtraction("Start","StartSample",""); interceptorConfig.RegisterDataExtraction("End","EndSample",""); // this is the indicator for when the Interceptor is to start and stop // listening for events. @ID is an XPath to where to locate the ID // in the document passed in (see code for calling Interceptor, below) interceptorConfig.RegisterStartNew("StartSample", "@ID"); interceptorConfig.RegisterEnd("EndSample"); // Create the Interceptor bin file BAMInterceptor interceptor = new BAMInterceptor(); interceptorConfig.UpdateInterceptor(interceptor); // write the file out BinaryFormatter format = new BinaryFormatter(); Stream file = File.Create("BAMApiSample.bin"); format.Serialize(file, interceptor); file.Close(); } 10. Build the solution. Run the executable. This will write out a binary file, which can now be referenced by the code to call the interceptor. 11. Additionally, an XML document could be generated, which would look like the following (this is not a required step):

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<TraceInterceptorConfiguration xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <TrackPoint Type="Start"> <Location xsi:type="xsd:string">StartSample</Location> <ExtractionInfo xsi:type="xsd:string">@ID</ExtractionInfo> </TrackPoint> <TrackPoint Type="End"> <Location xsi:type="xsd:string">EndSample</Location> </TrackPoint> </TraceInterceptorConfiguration> 12. Now, open the BAMApiSample.cs file to observe how it is structured. The key items to look at follow: The class MainApp: This class contains the main function that constructs the XML document and event stream that will be used to call the BAM Interceptor. The class DataExtractor: This class contains the extractor that returns the data within a given node of the XML document based on the XPath passed as a parameter. The XPath comes directly from the binary configuration file created by the InterceptorConfig.exe file. The #If Interceptor statements: All statements within these directives call the BAM Interceptor.

The following code is directly from one of the SDK s #If Interceptor directives. It shows how the binary file is loaded and how the OnStep method in the BAM Interceptor is called. In this case, the dataExtractor contains information about how to extract the data from a given node (with the XPath from the binary file), and locNewPo maps to the Received Activity in the Tracking Profile Editor. BAMInterceptor interceptor=Global.LoadInterceptor("BAMApiPo_interceptor.bin"); interceptor.OnStep(Global.dataExtractor,"locNewPo",xePO,Global.es);

Finalizers are not to be used routinely; in fact, if you can avoid them, you should A possible use is for the last-ditch cleanup of unmanaged resources in cases where you can t be sure whether the destructor is called Examples of unmanaged resources are native file handles, device contexts, and so on However, the NET Framework provides wrapper classes for most of these unmanaged resources, for example, the HWnd class and the SafeHandle family of classes When using the wrapper classes, the wrapper classes will take care of their own cleanup Finalizers are particularly difficult to write correctly, because when they execute, their members may be disposed, in the process of finalization, or already finalized themselves Also, to be truly robust, they need to correctly handle various rare circumstances, such as being called more than once.

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