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Although it s possible to check whether data is tainted and perform preventative actions to clean it up, a stronger form of protection comes with Ruby s safe levels. Safe levels allow you to specify what features Ruby makes available and how it should deal with tainted data. It s worth noting before we get too far that Ruby s safe level functionality is rarely used, so your use of it will probably be limited to very particular situations. Manipulating the safe level is unpopular, primarily because it can tread on the toes of what libraries can do on your system, and secondly because developers usually strive to develop code that s secure without needing to go to such lengths. An analogy would be that it s better to drive a car safely than to just have excellent airbags. If you do choose to use safe levels, however, the current safe level is represented by the variable $SAFE. By default, $SAFE is set to 0, providing the lowest level of safety and the highest level of freedom, but four other safe modes are available, as shown in Table 11-1. Table 11-1. Ruby s Safe Levels, As Represented by $SAFE

The model in the MVVM pattern encapsulates business logic and data Business logic is defined as any application logic that is concerned with the retrieval and management of application data and with making sure that any business rules that ensure data consistency and validity are imposed To maximize re-use opportunities, models should not contain any use case specific or user task specific behavior or application logic Typically, the model represents the client-side domain model for the application It can define data structures based on the application s data model and any supporting business and validation logic The model may also include the code to support data access and caching, although in most cases, a separate data repository or service is employed for this Often, the model and data access layer are generated as part of a data access or service strategy, such as the ADO.

Table F-1. Computer CLIENT1 running Windows XP Professional ROUTER1 running Windows Server 2003 INTERNET running Windows Server 2003 ROUTER2 running Windows Server 2003 CLIENT2 running Windows XP Professional Test Lab Computer Setup Roles Client computer Answering router Internet router Calling router Client computer

NET Entity Framework, WCF Data Services, or WCF RIA Services Typically, the model implements the facilities that make it easy to bind to the view This usually means that it supports property and collection changed notification through the INotifyPropertyChanged and INotifyCollectionChanged interfaces Models classes that represent collections of objects typically derive from the ObservableCollection<T> class, which provides an implementation of the INotifyCollectionChanged interface The model may also support data validation and error reporting through the IData ErrorInfo (or INotifyDataErrorInfo) interfaces These interfaces allow WPF and Silverlight data binding to be notified when values change so that the UI can be updated They also enable support for data validation and error reporting in the UI layer What if your model classes do not implement the required interfaces You may have to work with model objects that do not implement the INotify PropertyChanged, INotifyCollectionChanged, IDataErrorInfo, or INotify DataErrorInfo interfaces.

Programmer-defined variable types are one of the most powerful capabilities a language can give you to clarify your understanding of a program. They protect your program against unforeseen changes and make it easier to read all without requiring you to design, construct, and test new classes. If you re using C, C++ or another language that allows user-defined types, take advantage of them! To appreciate the power of type creation, suppose you re writing a program to convert coordinates in an x, y, z system to latitude, longitude, and elevation. You think that double-precision floating-point numbers might be needed but would prefer to write a program with single-precision floating-point numbers until you re absolutely sure. You can create a new type specifically for coordinates by using a typedef statement in C or C++ or the equivalent in another language. Here s how you d set up the type definition in C++:

In those cases, the view model may need to wrap the model objects and expose the required properties to the view The values for these properties will be provided directly by the model objects The view model will implement the required interfaces for the properties it exposes so that the view can easily bind data to them..

getName() Name getParameterTypes() GetParameters() getReturnType() invoke() ReturnType Invoke()