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Although the example of validating the next leg without functors and adding the validation to the property NextLeg works, it doesn t represent a correct solution. The problem is that the validation is carried out in the context of the class. Classical object-oriented design dictates that this is the approach to use. However, if any other type of validation is required, the validation code will have to be updated by changing the source code of the type. This makes validation a maintenance issue. In 5, you saw how patterns can separate the GUI logic from the application logic. That concept needs to be extended so that validation logic is separated from the class. The class might consume validation logic, but doesn t define what the validation logic is. This approach still adheres to the classical object-oriented design rule in which the object is responsible for performing the validation, but doesn t need to know the exact implementation of the validation. Imagine the following: you are writing the code for the flight ticket program and release version 1.0. For version 1.1, it has been decided that the flight legs won t be referenced in Flight, but in a class called Ticket, which references a list of IFlight interface instances. The validation logic will have to be transferred from the Flight implementation to the Ticket implementation. Here s an abbreviated implementation of Ticket in which the validation logic is moved:

The odds are that the Selection and Subselection tools are the ones you will use most frequently in your everyday workflow. Along with the Free Transform and Gradient Transform tools, you will use these tools, at least once, in practically any Flash design situation.

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You can certainly leverage these in RemoteObjects as well, but the supporting infrastructure is not as well developed, and you will need to write much more manual code compared with the limited amount of support coding required in Web services Scalability-wise, RemoteObjects are optimized for communications within the same process, or across different processes that are on the same computer Traditional ASPNET Web services are built for interoperability more than for scalability It remains to be seen what performance advances Indigo Web services have made by comparison Web services and RemoteObjects preserve similar clear choices to what we have today with ASPNET Web services and NET Remoting..

Object Drawing button (the circle in the Options area at the bottom of the toolbar) is deselected. (We aren t going explain why at this point because we have devoted a section of this chapter to that very subject.) Draw a rectangle on the stage. Choosing a color for the stroke and fill is not important right now.

2. Switch to the Selection tool, as shown in Figure 2-3, by either clicking it or pressing the V key.

10

class FlightAlreadyPresentException : Exception { } class Ticket { private IList< IFlight> _flightLegs = new List< IFlight>(); public void AddLeg( IFlight leg) { foreach( IFlight flight in _flightLegs) { if( flight.Equals( leg)) { throw new FlightAlreadyPresentException(); } } _flightLegs.Add( leg); } } The class Ticket has a method called AddLeg in which the flight legs are iterated and tested for equality. If the flight leg to be added is equal to an already existing flight leg, then an exception is thrown. Otherwise, the flight leg is added to the list _flightlegs. The problem is that the application logic had to be moved from one type to another. In the example, the logic is based on calling the method Equals with the correct parameters. Imagine if the logic were more complicated, and more code had to be copied or moved. This results in maintenance issues because validation logic exists in multiple places. In this example, the maintenance issues aren t as grave, since most likely the property Flight.NextLeg would be deleted from the interface. But then you have a design dilemma in that interfaces are supposed to be immutable, and therefore the method Flight.NextLeg needs to remain in place. The property can be deprecated, but the bigger problem is that you have validation logic in multiple places coded to fit the situation. Separating the validation from the implementation into a single method call makes it possible to use the same validation code in the method AddLeg and property NextLeg.

When you roll the tool over the square, a cross with arrows appears under the mouse pointer. This means you are hovering over an object that can be moved by clicking and dragging.

All tools can be selected using the keyboard. If you roll the mouse pointer over a tool, a tooltip, as shown in Figure 2-3, will appear, and the letter between the brackets is the key that can be pressed to select the tool. If you find tooltips annoying, open Preferences General and deselect Show tooltips in the Selection section of the Preferences dialog box.

3. Click the square, and drag to the right. Holy smokes, you just pulled the fill out of the square (see

Indigo applications decouple the messaging and transport layer from the service layer, which allows you as the developer to focus on programming the service without having to worry about implementing the lower-level communications infrastructure. The service layer is built using the class framework that is provided by the Indigo service model. It includes classes that allow you to interact programmatically with the messaging layer. In this section, I will review five important aspects of Indigo that provide support for managing and processing service-oriented applications: The Indigo service layer Ports Typed channels Service managers Transports and formatters

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