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The service contract expresses the methods that are exposed to the outside world. The service contract is also commonly referred to as the service interface or the exposed behavior of the service. It describes what you can expect from the service, and its policy describes what requirements the service has. Service contracts are implemented as .NET interfaces. The service interfaces are implemented as .NET classes implementing the .NET interfaces. To make the classes WCF service contracts, you must annotate the interface with the [ServiceContract] attribute. The operations need to be annotated with the [OperationContract] attribute. You can find the ServiceContractAttribute and OperationContractAttribute classes in the System. ServiceModel namespace, which you have to include with a using statement. Listing 3-1 shows the service contract defined as a .NET interface for QuickReturns Ltd., including two operation contracts.

#pragma mark - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; gestureStartPoint = [touch locationInView:self.view];

} - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint currentPosition = [touch locationInView:self.view]; CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x); CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y); if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance) { label.text = @"Horizontal swipe detected"; [self performSelector:@selector(eraseText) withObject:nil afterDelay:2]; } else if (deltaY >= kMinimumGestureLength && deltaX <= kMaximumVariance){ label.text = @"Vertical swipe detected"; [self performSelector:@selector(eraseText) withObject:nil afterDelay:2]; } } @end

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Listing 3-1 ServiceContract for the Trade Service using SystemServiceModel; using QuickReturnsStockTradingExchangeServiceDataContracts; namespace QuickReturnsStockTradingExchangeServiceContracts { [ServiceContract(Namespace = "http://QuickReturns")] interface ITradeService { [OperationContract()] Quote GetQuote(string ticker); [OperationContract()] void PublishQuote(Quote quote); } } This service is the exchange of the stock-trading application for QuickReturns Ltd The contract of this service defines the interaction that is going on between the sellers and buyers on a stock market Sellers offer their stocks by publishing quotes A quote obviously defines the company the stock is for and what price the seller wants to have for it Hence, the PublishQuote method is able to publish quotes by sellers on the trade service The buyers, on the other hand, will query the trade service to get a quote on a specific type of stock for a specific company Therefore, the GetQuote method is able to retrieve published quotes from the service.

The wizard is straightforward, but it can sometimes be a little counterintuitive. You may not even realize that there is a database mirroring wizard just from looking around. You will not find the wizard listed under the database mirroring topics in SQL Server Books Online. You can access the database mirroring wizard from Object Explorer within SQL Server Management Studio. This is how you start the wizard: 1. 2. 3. 4. Expand the Databases node. Right-click on the database that you want to mirror. Click on Properties. Click on Mirroring in the left pane to switch to the Database Properties Mirroring page. Figure 4-1 shows the Database Properties Mirroring page.

Let s start with the touchesBegan:withEvent: method. All we do there is grab any touch from the touches set and store its point. We re primarily interested in single-finger swipes right now, so we don t worry about how many touches there are; we just grab one of them.

UITouch *touch = [touches anyObject]; gestureStartPoint = [touch locationInView:self.view];

When the buyer finds an appropriate seller, the actual exchange of stocks can take place by a different service (which will be covered later in this book) As you can see, the exchange service is marked with the [ServiceContract] attribute and currently has two operations, GetQuote and PublishQuote These operations have the [OperationContract] attribute applied WCF uses these attributes to determine which NET methods it needs to invoke based on an incoming SOAP message The attributes also determine the serialization WCF has to do for you WCF serialization encompasses the mapping from SOAP messages to your NET objects In Listing 3-1, Quote is a custom NET type where no mapping is defined yet For the custom Quote object and any other custom object you want to pass between services and clients, you have to define data contracts Data contracts control the mapping between SOAP messages and NET objects.

In the next method, touchesMoved:withEvent:, we do the real work. First, we get the current position of the user s finger:

UITouch *touch = [touches anyObject]; CGPoint currentPosition = [touch locationInView:self.view];

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