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CHAPTER 11 BUS IN ESS AN D V ALIDA TION RULES
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For i As Integer = 0 To dependencies.Count - 1 Dim dependentProperty = dependencies(i) result.Add(dependentProperty) CheckRules(rules, dependentProperty) Next Another overload of CheckRules() is called here. It simply checks the rules for one specific property, without doing further checks for dependent properties. In other words, the dependent property concept isn t recursive. That s important because otherwise this code would have to check for circular dependency loops, and it would become too easy for a business developer to accidentally trigger checking too many properties when one property is changed.
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Checking Rules for All Properties
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The other Public overload of CheckRules() allows the business developer to request that the rules for all properties be invoked. This method is commonly called when an object is first created and sometimes right after an object is loaded with data from the database. It is also commonly called when rule checking is suppressed, because a lot of properties are loaded. All rules are checked when the load process is complete. This method is relatively short: Public Sub CheckRules() If _suppressRuleChecking Then Return End If Dim rules = RulesToCheck If rules IsNot Nothing Then For Each de In rules.RulesDictionary CheckRules(de.Value.GetList(True)) Next End If End Sub Like the property-specific overload, this one honors the SuppressRuleChecking property and immediately exits if rule checking is suppressed. If rule checking is enabled, which is the default, then it retrieves all the rules for the entire object by calling RulesToCheck, and it loops through each entry in the Dictionary, executing the list of rules for each property. At this point, it should be clear how ValidationRules associates rule methods with properties and is then able to check those rules for a specific property or for the business object as a whole.
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Maintaining a List of Broken Rules
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The ValidationRules object also maintains a list of currently broken validation rules for the object. This is used to implement IDataErrorInfo in BusinessBase, allowing each business object to easily indicate whether the object is valid. Because the broken rule objects in the list include the property name that is invalid, the broken rules list is also used to determine whether each individual property is valid or invalid. The BrokenRulesCollection class maintains the list of broken rules for a business object and is declared in ValidationRules like this: Private _brokenRules As BrokenRulesCollection Private ReadOnly Property BrokenRulesList() As BrokenRulesCollection Get
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CHAPTER 11 BUS INE SS AND V ALIDA TION RULES
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If _brokenRules Is Nothing Then _brokenRules = New BrokenRulesCollection() End If Return _brokenRules End Get End Property Notice that the _brokenRules field is not adorned with either the NotUndoable or NonSerialized attribute. The list of currently broken rules is directly part of a business object s state, so it is subject to n-level undo operations and to being transferred across the network along with the business object. This way, if a business developer transfers an invalid object across the network or makes a clone, the object will remain invalid, with its list of broken rules intact. The BrokenRulesList value is also exposed via a Public method on BusinessBase. To any external consumer, such as code in the UI, this is a read-only collection. <Browsable(False)> _ <EditorBrowsable(EditorBrowsableState.Advanced)> _ Public Overridable ReadOnly Property BrokenRulesCollection() _ As Validation.BrokenRulesCollection Get Return ValidationRules.GetBrokenRules() End Get End Property The reason the collection is exposed publicly is to allow UI developers to use the list of broken rules as they see fit. Remember that a broken rule includes a human-readable description of the rule, so it is perfectly reasonable to display this list to the end user in some circumstances.
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BrokenRule Class
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When a rule method is invoked by the CheckRules() method, it returns True or False. If it returns False, the broken rule will be recorded into a BrokenRulesCollection. Here s the code from CheckRules() that implements this behavior: SyncLock BrokenRulesList If ruleResult Then ' the rule is not broken BrokenRulesList.Remove(rule) Else ' the rule is broken BrokenRulesList.Add(rule) If rule.RuleArgs.Severity = RuleSeverity.[Error] Then previousRuleBroken = True End If End If End SyncLock The BrokenRulesCollection object exposed by the BrokenRulesList property contains a list of BrokenRule objects, each representing a single broken business rule. The Add() and Remove() methods accept an IRuleMethod and create the BrokenRule object internally. The BrokenRule object exposes read-only properties for the rule name, a human-readable description of the broken rule, and the name of the property that is broken. The class is available in the code download for the book, available in the Source Code section of the Apress website (www.apress.com) and www.lhotka.net/cslanet/download.aspx.
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