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CHAPTER 5 RULES-BASED WORKFLOW
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Figure 5-14. Equal0 rule definition Execute the workflow. You ll see the value is 0 before the Policy activity but -1 afterward. The Equal0 rule within the RuleSet is the one that was executed. Each rule in the RuleSet has a priority value (next to the name), with a default of 0. The rules within a RuleSet are a list of rules sorted by priority. The rule with the highest priority value is evaluated first. Next, the Then or Else action is executed. If the condition evaluates to Else and there s no Else action, then the next rule is evaluated. Also, if an action of a rule updates a field or property used by a previous rule (one with a higher priority), the previous rule is reevaluated and actions are taken as necessary. This continues until all rules within the RuleSet are evaluated.
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There s also a Chaining property for a RuleSet. You ll find this as a drop-down at the top right of the Rule Set Editor. Chaining sets the dependencies between rules. The simplest chaining is Sequential. With this option selected, each rule is evaluated in order based on the priority. To see this in action, view the code and change the default value of IntValue to 1. Then change the Then Action of the Equal0 rule to set IntValue to 1. Execute the workflow. You ll see the value is 1 before the Policy activity, but 0 after the Policy activity. This isn t what you would expect. The GreaterThan0 rule sets the value to 0, and the Equal0 rule sets the value to 1. The rules within the RuleSet are to be executed in order. The problem is that the priority of both rules is 0. So only the first rule in that priority is executed when using Sequential chaining. Open the Rule Set Editor again. Change the priority of the GreaterThan0 rule to 1 and set the Chaining to Sequential chaining. With this change, the GreaterThan0 rule, with a priority of 1, is executed first and sets the value to 0. Then, the Equal0 rule, with a priority of 0, is executed and changes the value to 1. Execute the workflow, and you ll see that the value is 1 both before and after the Policy activity.
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CHAPTER 5 RULES-BASED WORKFLOW
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Within the Then Actions and Else Actions areas of a rule, you can use the Halt command. This can be the only command within the box or included with others. The Halt command prevents further execution of rules within the RuleSet. To see this, open the Rule Set Editor and edit the GreaterThan0 rule. After the this.IntValue=0 statements within the Then Actions box, add Halt. The rule definition now looks like Figure 5-15.
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Figure 5-15. Rule definition with Halt in the Then Actions Execute the workflow, and you ll see before the Policy activity the value is 1, and after the Policy activity the value is 0. That s different from the last execution of the workflow. Besides simply setting values, you can also call methods defined within the workflow from the Then Actions and Else Actions of a rule. View the code and add the following lines of code: Private Sub GreaterThan0() MsgBox("Greater than 0") End Sub Open the Rule Set Editor and edit the GreaterThan0 rule. Remove the Halt statement from the Then Actions area and replace it with this.GreaterThan0(). Figure 5-16 shows the updated Then Actions area. Make sure you have the parenthesis at the end; otherwise, you ll get an error message when you attempt to click OK on the Rule Set Editor. The Rule Set Editor is case sensitive with regard to properties and methods. This means you must use the exact same case for properties, and you must add the parenthesis after a method call. Execute the workflow. You ll get the before Policy activity message, the Greater than 0 message, and the after Policy activity message. Of course, you can use the ability to call a method to do more than just display a message box. You can also call a method to set values or retrieve data.
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