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The current implementation of MyResourceWrapper does work fairly well; however, we are left with a few minor drawbacks. First, the Finalize() and Dispose() method each have to clean up the same unmanaged resources. This of course results in duplicate code, which can easily become a nightmare to maintain. Ideally, you would define a private helper function that is called by either method. Next, you would like to make sure that the Finalize() method does not attempt to dispose of any managed objects, while the Dispose() method should do so. Finally, you would also like to make sure that the object user can safely call Dispose() multiple times without error. Currently our Dispose() method has no such safeguards. To address these design issues, Microsoft has defined a formal, prim-and-proper disposal pattern that strikes a balance between robustness, maintainability, and performance. Here is the final (and annotated) version of MyResourceWrapper, which makes use of this official pattern (and is very similar to the autogenerated code injected by the IDE when implementing the IDisposable interface using Visual Studio 2005): Public Class MyResourceWrapper Implements IDisposable ' Used to determine if Dispose() ' has already been called. Private disposed As Boolean = False Public Sub Dispose() Implements IDisposable.Dispose ' Call our helper method. ' Specifying True signifies that ' the object user triggered the clean up. CleanUp(True) GC.SuppressFinalize(Me) End Sub Private Sub CleanUp(ByVal disposing As Boolean) ' Be sure we have not already been disposed! If Not Me.disposed Then If disposing Then ' Dispose managed resources. End If ' Clean up unmanaged resources here. End If disposed = True End Sub Protected Overrides Sub Finalize() ' Call our helper method. ' Specifying False signifies that ' the GC triggered the clean up.

Naming conventions might not seem important at first, but as your service inventory in the organization grows, so will the potential to reuse and leverage the existing service to achieve integration within the various groups and systems The effort required to establish a consistent naming convention within an organization pays off quickly A consistent set of services that cleanly establish the level of clarity between the services enables easier interoperability and reuse Unfortunately, no magic bullet can help you standardize on the right level of granularity that will enable service orientation But, the key point to remember is the service should achieve the right balance to facilitate both current and upcoming data requirements, in essence meeting the business s need to be more agile and responsive to market conditions..

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Although it always is hard to believe until you look at the underlying CIL code, assignments and simple arithmetic operations are not atomic! For this reason, the System.Threading namespace provides a type that allows you to operate on a single point of data atomically with less overhead than with the Monitor type. The Interlocked class type defines the shared members shown in Table 16-4. Table 16-4. Members of the System.Threading.Interlocked Type

Adding new features to a single Xcode project that shares common code between the two platforms is much more time-efficient than needing to add the same code to separate projects 11 covers the process of creating a universal application, complete with expert tips and conditional coding examples You ll also learn how to convert an existing iPhone project into a universal app using Xcode s new Upgrade Current Target for iPad feature..

CompareExchange() Decrement() Exchange() Increment()

Safely tests two values for equality and, if equal, changes one of the values with a third Safely decrements a value by 1 Safely swaps two values Safely increments a value by 1

Once you have included the references to System.Transactions and in particular Sys.Data. SqlClient, you have laid the basis for supporting transactions, as well as supporting the logging database. So, now look at Listing 9-8, where you will set the transaction isolation level for the trade service. Listing 9-8. Setting the Transaction Isolation Level // Service class that implements the service contract. [ServiceBehavior(TransactionIsolationLevel = System.Transactions.IsolationLevel.Serializable)] Now you ll set the transaction scope, which will encapsulate the operations you want to occur within the transaction, as shown in Listing 9-9. Listing 9-9. Setting the Transaction Scope public class TradeService : ITradeService { [OperationBehavior(TransactionScopeRequired = true)] public int CalculateTradeValue(int qty, int price) { RecordToLog(String.Format(CultureInfo.CurrentCulture, "Recording CAN Trade Value {0} with price {1}", qty,price )); return qty * price; } private static void RecordToLog(string recordText) { // Record the operations performed if (ConfigurationManager.AppSettings["usingSql"] == "true") { using (SqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings ["connectionString"])) { conn.Open(); // you are now going to log our trade to the Log Table. By actually inserting the data into the table. SqlCommand cmdLog = new SqlCommand( "INSERT into Log (Entry) Values (@Entry)", conn); cmdLog.Parameters.AddWithValue("@Entry", recordText); cmdLog.ExecuteNonQuery(); cmdLog.Dispose();

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