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CHAPTER 20 POLICY
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Rule #4 is executed, but no action is taken.
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The final results will be the following: nTotal = 15 bSuccess = False nResult = -1
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For each Rule, the Reevaluation property can be set to either Always (the default value) or Never. Always doesn t actually mean always; it means to re-evaluate if a member in the condition is modified (as described previously). Never means the Rule is evaluated only once, even if a member has been changed. The Never option turns off chaining for that Rule. The RuleSet has a Chaining property, which also controls if/how chaining is applied. The default value is Full Chaining, which re-evaluates rules as defined previously. The Sequential option turns off chaining. It is equivalent to setting the Reevaluate property to Never for all rules. The Explicit Update Only option performs re-evaluation only when specifically directed to with the Update action.
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Halt and Update
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In addition to setting properties and calling workflow methods, you can also use the Halt and Update commands in the Then and Else actions. The Halt command causes all rule evaluation to stop immediately, and the activity is completed. You used it on several of the Rule instances in the previous RuleSet. If the Chaining option is set to Explicit Update Only, you must use the Update command to force any necessary rule re-evaluations. The Update command specifies a single property. Any previous rule that uses that property is re-evaluated. If you need to check for multiple properties, you can call the Update command multiple times. The property is generally specified using the this. notation. For example, the Update command could be this: Update(this.Review) This is also an acceptable form: Update("this/Review")
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The actual Rule definition is stored in the QCPolicy.rules file. You can select this from the Solution Explorer, as shown in Figure 20-10.
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Figure 20-10. Selecting the rules file If you double-click this file, you can see the actual contents. It uses an XML structure to store the various parts of the RuleSet and each of the Rule objects.
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Determining the Priority
If you determine that this activity should be reviewed, now you ll also decide what priority should be given to the review. For example, we might want higher value transactions to move to the top of the list. Open the QCPolicy.cs file in design mode and drag an IfElseActivity below the ReviewPolicy activity. Click the left branch, and in the Properties window set the Name property to IfReview. For the Condition property, select Declarative Rule Condition. Expand the Condition property; for the ConditionName, enter Review; for the Expression property, click the ellipsis and enter this.Review. This branch will be executed only when the Review property is True. The Properties window should look like the one shown in Figure 20-11.
Figure 20-11. Properties windows of an IfElseBranch activity Drag a PolicyActivity onto the ifReview branch and set the Name property to PriorityPolicy. The workflow diagram should look like the one shown in Figure 20-12.
CHAPTER 20 POLICY
Figure 20-12. Workflow diagram for the QCPolicy custom activity
Entering the Priority Rules
Select the PriorityPolicy activity. In the Properties window, select the RuleSetReference property and click the ellipses. The Select Rule Set dialog should show the RuleSet that you just created. Click the New link to create a different RuleSet for this PolicyActivity. Click the Add Rule link. Enter the Name as Major Account, the Priority as 3, and the Condition as: this.CustomerData.Category == "Major" For the Then action, enter this.Priority = "High"; for the Else action, enter this.Priority = "Normal". This will set the Priority to High for major accounts and Normal for everyone else. Add another Rule to handle transactions that exceed the ThresholdAmount. Enter the Name as Over Limit, the Priority as 2, and the Condition as: this.TransactionData.Amount >= this.ActivityData.ThresholdAmount For the Then action, enter this.Priority = "High"; there is no Else action. Add a final Rule named Minimum. For the Condition, enter: this.TransactionData.Amount < this.ActivityData.MinimumAmount For the Then action, enter this.Priority = "Low". The completed RuleSet should look like the one shown in Figure 20-13.
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