Compensator Components in VS .NET

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The compensator for the FileComponent is implemented in the class FileCompensator (see Listing 8-4) This class derives from the base class Compensator, which itself derives fromServicedComponent The only three methods that are overridden from the base class are PrepareRecord, CommitRecord, and AbortRecord With PrepareRecord, there is no need to do anything special inside this classjust returnfalse Otherwise, the LogRecord that is passed by the CRM runtime would not be forwarded to the methods CommitRecord or AbortRecord In the case where the transaction is committed, the CRM runtime calls the CommitRecord method Within the compensator, the actual file that should exist must be created The filenames that have been passed with the FileLogRecord can be accessed by using the Record
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property of the LogRecord object Using the filenames, theFile class helps rename the temporary file to the real file The AbortRecord method is very similar to CommitRecord, but here only the temporary file is deleted
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Listing 8-4 Compensator Component
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using System; using SystemIO; using SystemEnterpriseServices; using SystemEnterpriseServicesCompensatingResourceManager; namespace SamplesCRM { public class FileCompensator : Compensator { public override bool PrepareRecord(LogRecord rec) { return false; } public override bool CommitRecord(LogRecord rec) { FileLogRecord logRecord = (FileLogRecord)recRecord; switch (logRecordAction) { case ActionCreateFile: // create real file FileMove(logRecordTempfilename, logRecordFilename); break; } return true; } public override bool AbortRecord(LogRecord rec) { FileLogRecord logRecord = (FileLogRecord)recRecord; switch (logRecordAction) { case ActionCreateFile: // delete temp file FileDelete(logRecordTempfilename); break; } return true; } } }
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After the serviced component application is registered, you can see both the compensator and the worker components with the Component Services Explorer, as shown in Figure 8-5 Remember that with CRM applications, you must not forget to install the assembly in the global assembly cache
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Figure 8-5 Component Services Explorer with registered worker and compensator
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Client Applications
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Now you can create a client application to test the serviced component Client applications are created in the same way you have seen so far, as shown in Listing 8-5 The worker component gets created, and the methodCreateFile is called If everything goes well, the file c:/temp/demofiletxt will have the content that was passed with CreateFile
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Listing 8-5 Client Application
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[STAThread] static void Main(string[] args) { try { SamplesCRMFileComponent comp =
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks new SamplesCRMFileComponent(); compCreateFile("c:/temp/demofiletxt", "AWL", "Steph"); compDispose(); } catch (Exception ex) { ConsoleWriteLine(exMessage); }
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You can also try to fail the worker by throwing an exception in the CreateFile methodthe compensator will deal with the undo mechanism Alternatively, you can use the worker component from a different serviced component that creates a transaction; in this scenario, you can see whether the worker component participates in the same transaction What happens if the machine goes down while a transaction was in process Because the log information was written before any activity was performed, you have a good chance for recovery In such a case, when the server application process starts up, the CRM runtime finds the log file, talks to the DTC about the outcome of the transaction, and performs the recovery by instantiating the compensator
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Monitoring
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You can use the ClerkMonitor and ClerkInfo classes to monitor the activities of clerks The ClerkMonitor implements the interface IEnumerable, so you can enumerate through all running clerks However, the clerks that are returned are only those running in the same process as the clerk monitor; therefore, you can get to this information only within an "admin" component that is configured in the same application as the worker who instantiates the clerk From the enumeration, you will get ClerkInfo objects representing every clerk in the process With ClerkInfo, you can access the activity ID, transaction ID, compensator description, and the clerk itself Using the COM interface ICrmMonitorLogRecords that is implemented by the clerk, you can also access the log records written by the clerk This interface is not directly available from NETyou must use COM interop to get to the log file information
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Summary
This chapter has shown how to create a CRM worker and compensator object to create a "lightweight" resource manager that enables you to integrate resources that do not support transactions with the transactional support of serviced components The important thing to remember is that all tasks done by the worker must be documented in a log with the help of the clerk The clerk communicates with the DTC and manages the compensator to commit or abort the tasks performed
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CRM is an initialism with multiple meanings Today, CRM usually refers to customer relationship management In the context of NET Enterprise Services and COM+, however, CRM refers to compensating resource manager A serializable object must be declared with the attribute[Serializable] Atomicity, consistency, isolation, and durability (ACID) are discussed in 7, "Transaction Services" See 7 for more information about the[transaction] and [AutoComplete] attributes See 2, "Object Activation and Contexts," for more information about the[ConstructionEnabled] attribute
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