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requires another activity either an EventDriven, StateInitialization, or StateFinalization activity to be placed within the State activity. Therefore, the State activity is a composite activity because it s made up of one or more other activities. Right-click the FirstState State activity and choose AddEventDriven. When you do this, the designer surface will change, as shown in Figure 2-8.
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Figure 2-8. State Composition View The State Composition View allows you to add EventActivity activities to the FirstState State activity. You can return to the State Composition View (the normal workflow design surface) by right-clicking anywhere on this design surface and choosing Back To State Composition View. Another way to return to the State Composition View is to click either the Workflow1 or FirstState links on the top left of this window. If you click the FirstState link at the top left, you ll return to the FirstState state, and if you click the Workflow1 link at the top left, you ll return to the overall workflow. They re one and the same for now because you have a small workflow, but this can be useful if you have a long workflow. If you re back in the State Composition View (the default workflow design surface), then you ll see the EventDriven activity added within the FirstState State activity, as shown in Figure 2-9. If you double-click the eventDrivenActivity1 state within the FirstState State activity, you ll get back to the EventDrivenActivity. You ll see an exclamation point in the right corner of the EventDrivenActivity1 activity within the FirstState State activity. When you click the exclamation point, you ll see that a child activity must be present. For this first, simple State Machine workflow, drag and drop the Delay activity from the Toolbox. Make sure to drop it within the EventDrivenActivity1 activity. You ll use this Delay activity to pause a set period of time before changing states. All this workflow is going to do is wait a set period of time, move to the next state, pause a set period of time, and then move to the completed state.
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CHAPTER 2 FIRST WORKFLOW
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Figure 2-9. EventDrivenActivity1 within the FirstState State activity Click the DelayActivity1 activity and open the Properties window. Find the Time Interval property you ll see this is a drop-down list. You can either choose a time interval from here for the delay or you can customize the interval. Enter 00:00:30. This is a 30-second interval, and causes the workflow to pause at the FirstState State activity for 30 seconds before changing state. Now add another State activity with a name of SecondState and a description of This is the second state. Add an EventDriven activity to this state and a Delay activity to the EventDrivenActivity that pauses 30 seconds. The workflow will look like Figure 2-10.
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Figure 2-10. Three State activities within the State Machine workflow
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The final task that needs to be done is to enable the states to be changed. The FirstState State activity will change states to the SecondState State activity, and the SecondState State activity will change states to the CompletedState State activity. The FirstState and SecondState State activities will each pause 30 seconds before changing states. You need to use the SetState activity to change state. Double-click the EventDrivenActivity1 activity within the FirstState State activity. Drag and drop a SetState activity after the Delay activity that s already within the EventDriven activity, so the EventDriven activity looks like Figure 2-11.
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Figure 2-11. SetState activity within the EventDriven activity The exclamation point in the upper-right corner of the SetState activity is there because you haven t set the target state for the state to be changed to. Click the SetStateActivity1 activity and open the Properties window. Find the TargetStateName property, which has a drop-down list. This drop-down list contains the names of all the State activities within this workflow. You can choose from this drop-down which State activity this State activity should change to when the SetState activity is fired. In this case, choose SecondState. Return to the State Composition View and double-click the EventDrivenActivity2 activity within the SecondState State activity. Add a SetState activity to the EventDriven activity and set the TargetStateName property to CompletedState. After you add the SetState activity, return to the State Composition View. You ll see that the State activities are all linked together now with a line and arrow that shows the flow of the state machine, as shown in Figure 2-12.
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