ContextUtil Methods in .NET

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ContextUtil Methods
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The ContextUtil class has four methods to influence the values of the done and consistent bits The methods and their influence of the done and consistent bits are shown in Table 7-3 One thing to keep in mind is that calling these methods only influences the outcome of the method of the serviced component but does not have an immediate result
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Table 7-3 ContextUtil Methods
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ContextUtil Method SetComplete Done Bit true Consistent Bit true Description The method SetComplete marks the object as done and consistent The work of the object is completed, and the transaction can be committed When the method returns, the object is deactivated, and the vote of the object regarding the transaction is to commit the transaction SetAbort true false The work of the object is completed, but it did not succeed; the transaction must be aborted When the method returns, the object is deactivated, but the transaction vote is to abort the transaction The work of the object is not completed; it should not be deactivated However, the first phase of the transactional work was successfully completed When the method returns, the object will not be deactivated, but the vote for the transaction is to commit the transaction If the root object of the transaction completes the transaction before the object is called for a second time, the object is deactivated Similar to EnableCommit, with DisableCommit the work of the object is not completed State of the object will be kept, so that it can be invoked another time However, contrary to the EnableCommit method, if the transaction is completed before the object is invoked a second time, the transaction vote is to abort the transaction
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EnableCommit
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false
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true
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DisableCommit
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The Done Bit Is Ignored If the Transaction Is Finished
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Although the EnableCommit and DisableCommit methods set the done bit to false so that the state of the object can be kept, it can still happen that the object will be deactivated, and the state will be lost When the transaction is completed (either committed or aborted), all objects participating in the transaction are also deactivated
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Automatic Transaction Example
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Figure 7-9 shows the assemblies for the sample application With the sample application, the assembly SamplesCoursesData includes the class CourseData that is doing the database access code with the methodsAddCourse, UpdateCourse, and DeleteCourse The assembly SamplesCoursesComponents includes the serviced component CourseDataComponent that uses the class CourseData The assembly SamplesCoursesEntities includes business classes such asCourse, CourseData, and CourseDataCollection These classes are used all over within the application
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Figure 7-9 Assemblies with the transaction sample
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NOTE: Separating Assemblies
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Using automatic transactions, you can use an assembly just for data access that is separated from the serviced component assembly I always prefer this technique to reduce the code inside the serviced components to a large extent for being flexible with the serviced components technology With NET, there is no requirement that the classes accessing the database be configured components (This was a requirement with COM components)
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Listing 7-5 shows the AddCourse method from the CourseData class This method is very similar to theAddCourse method that was shown in Listing 7-2 But, contrary to the first implementation of AddCourse, here the transactional code has been removed because the transactional support will be added within the serviced component class
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Listing 7-5 AddCourse Method Without Programmatic Transactions
public void AddCourse(Course course) { SqlConnection connection = new SqlConnection(connectionString); insertCourseCommandConnection = connection; insertCourseCommandParameters["@CourseId"]Value = courseCourseId; insertCourseCommandParameters["@Number"]Value = courseNumber; insertCourseCommandParameters["@Title"]Value = courseTitle; insertCourseCommandParameters["@Active"]Value = courseActive; connectionOpen(); try { insertCourseCommandExecuteNonQuery(); } finally { connectionClose(); } }
The implementation of the serviced component class is shown in Listing 7-6 The class CourseUpdateComponent derives from the base class ServicedComponent and is marked with the attribute [TRansaction(TransactionOptionRequired)], so that a transaction stream will be created automatically when a new instance is created The construction string can be changed later by the system administrator In the method AddCourse, the transaction outcome is influenced with the methods of the classContextUtil: SetComplete and SetAbort If the method dbAddCourse completes successfully, ContextUtilSetComplete sets the done and consistent bits to mark a successful outcome If an exception occurs, the exception is caught in the catch block Here, the consistent bit is set to false by calling the method ContextUtilSetAbort The exception is rethrown, so that the calling method can get some information about the reason why the method failed Of course, you can also create a custom exception that is thrown in case of an error [2] is passed with the method Construct that is overridden
from the base class Serviced component construction is enabled with the attribute [ConstructionEnabled] This way the construction string