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CHAPTER 11 BUS INE SS AND V ALIDA TION RULES
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representation of the RuleArgs object. The rule method is expressed as class/method to provide a unique value even if the same rule method name is used in different classes. The RuleArgs object, at a minimum, includes the target property name with which the rule is associated. It also includes any other argument values maintained by the RuleArgs object. For instance, a rule will appear as follows: rule://ruleClass/ruleMethod/targetProperty arg1=value&arg2=value When a RuleMethod object is created, it initializes its RuleName property value as follows: ruleName = String.Format("rule://{0}/{1}/{2}", _ Uri.EscapeDataString(_handler.Method.DeclaringType.FullName), _ _handler.Method.Name, _ _args.ToString()) The FullName property of the type includes the namespace and type name. Combining this with the name of the rule method provides unique identification of the specific rule method. Because the rule name must be unique, any custom subclasses of RuleArgs should be sure to override ToString() to return a value that includes any custom data that is part of the argument object in the following form: targetProperty arg1=value&arg2=value&...
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The RuleDescription class in the Csla.Validation namespace can be used to parse the rule:// URI string into its constituent parts, much like you d use System.Uri to parse any other URI.
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When the business developer associates a rule method with a property, ValidationRules creates a RuleMethod object to maintain all this information. This RuleMethod object is what s actually associated with the property, thus providing all the information needed to invoke the rule when appropriate. One interesting bit of information is a priority value. Each rule association has a priority with a default value of 0. When rules are invoked by CSLA .NET, they are invoked in priority order, starting with the lowest value and counting up. So, priority 0 rules run first, then priority 1, 2, and so forth. A business developer can use this priority scheme to gain some control over the order in which the rules are invoked. The priority concept is important, because it works in concert with a short-circuiting feature. This feature allows CSLA .NET to stop invoking rules of a higher priority if any lower-priority rule has failed. By default, if any priority 0 rule fails, then no priority 1 or higher rules will be invoked. All priority 0 rules always run in any case. There s also a generic version of RuleMethod, which is declared like this: Friend Class Implements Implements Implements End Class RuleMethod(Of T, R As RuleArgs) IRuleMethod IComparable IComparable(Of IRuleMethod)
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It does the same thing as RuleMethod, but it stores strongly typed values based on the generic type parameters. And there s the asynchronous version, which is declared like this: Friend Class Implements Implements Implements End Class AsyncRuleMethod IAsyncRuleMethod IComparable IComparable(Of IRuleMethod)
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This is the same as RuleMethod, but it is designed to store a reference to an asynchronous rule method. That s a rule method that runs code on a background thread and calls back into ValidationRules when it is complete to report on whether the condition is met or the rule is broken. All RuleMethod classes implement IRuleMethod, so CSLA.NET can treat them polymorphically. In particular, as rules are associated with properties of a business object, the IRuleMethod objects are maintained in a list for each property, and that list uses the IRuleMethod type to do this. Any type of RuleMethod object handles the invocation of the rule method itself by exposing an Invoke() method. Public Function Invoke(ByVal target As Object) As Boolean Return _handler.Invoke(target, _args) End Function When ValidationRules is asked to check the business rules, it merely loops through its list of RuleMethod objects, asking each one to invoke the rule it represents. As you can see, the Invoke() method simply invokes the method via the delegate reference, passing in a reference to the object to be validated (the business object) and the RuleArgs object associated with the rule. If you look at the declarations of RuleMethod and RuleMethod(Of T, R), you ll see that they both implement IComparable(Of T). This interface is a standard .NET interface that you can implement to control how your objects are compared for operations such as sorting. This is important for these objects, because they will be sorted, and that sorting must be based on the value of the Priority property. To this end, here s the implementation of the interface: Private Function CompareTo(ByVal obj As Object) As Integer _ Implements IComparable.CompareTo Return Priority.CompareTo(DirectCast(obj, IRuleMethod).Priority) End Function Private Function CompareTo(ByVal other As IRuleMethod) As Integer _ Implements IComparable(Of IRuleMethod).CompareTo Return Priority.CompareTo(other.Priority) End Function This ensures that when the rules are sorted, they ll be sorted in ascending order by priority.
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