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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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Figure 13-4. The Visual Studio Solution Explorer, showing the use of Enterprise Template Projects
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The Client Component
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The client side of the system consists of a simple UI allowing dealers to enter new car orders. Figure 13-5 shows the order-entry UI.
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Figure 13-5. The user interface of the order-entry component
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CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
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Anytime the user changes the model in the drop-down list, the Style drop-down is populated based on the model. The list of styles is obtained by making a remote call to the Order Processor component. Anytime the style is changed in the drop-down list, the Color drop-down and the Options tree are repopulated, based on the style. Again, the list of colors and options is obtained via a call to the Order Processor component. Each option is associated with a cost. When the user puts a checkmark next to an option, the Total Price of Options field is updated to reflect all the options checked. I ll design the client UI by utilizing two classes called FormMain and WorkerOrderEntry, as shown in Figure 13-6.
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WorkerOrderEntry Model: Style: Color:
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FormMain
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Options: WorkerOrderEntry
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Figure 13-6. The two user-interface classes of the client Class FormMain hosts WorkerOrderEntry, which contains all the UI controls. The purpose of FormMain is to act as the entry point and builder for the client application. When the user acts on a control in WorkerOrderEntry, this class fires events to a Coordinator class called CoordinatorOrderEntry. The Coordinator handles some of the worker notifications, but in most cases forwards the notifications to a Router class that is responsible for interacting with the server-side component. Figure 13-7 shows the coupling diagram of the client system.
WorkerOrderEntry
FormMain
CoordinatorOrderEntry
Router
Figure 13-7. The coupling diagram of the client system
CHAPTER 13 CASE STUDY 3: A DISTRIBUTED WORKFLOW SYSTEM
The classes that do the most work are the Coordinator and the Worker. The Worker is responsible for the layout of the UI controls. The Worker also has the following two responsibilities: Presenting the Total Price of Options as a currency value Managing checkmarks in the Options tree The first option requires the currency amount to be displayed with a dollar symbol and two decimals. The second option is a bit more complicated. The Options tree displays a list of categories. Each category contains a list of options. If the user adds/removes a checkmark to a category, all the options in that category must be checked/unchecked. For all user actions, the Worker fires events to the Coordinator. The Coordinator is responsible only for one task: computing the Total Price of Options when the user clicks on an option in the Options tree. For all other worker notifications, the Coordinator reacts by forwarding them to the Router. Only the Router contains logic that interacts with the remote Order Processor component. Since the most important client classes are completely decoupled from each other, looking at a class diagram tells you almost nothing about how the client works. What you need to see is how the various client objects are wired together, as shown in Figure 13-8.
WorkerOrderEntry
OnGetStyles OnGetColors OnGetOptions OnSubmitOrder OnComputeCostOfOptions 1 2 3 4 5 GetStyles GetColors GetOptions SubmitOrder ComputeCostOfOptions 1 2 3 4 5
Coordinator OrderEntry
GetStyles GetColors GetOptions SubmitOrder ComputeCostOfOptions 9 8 7 6 GetStyles GetColors GetOptions 1 2 3
Router
OnGetStyles OnGetColors OnGetOptions OnSubmitOrder 8 7 6 5 GetStyles GetColors GetOptions SubmitOrder
OnGetStyles OnGetColors OnGetOptions OnSubmitOrder
GetStyles GetColors GetOptions SubmitOrder
SubmitOrder 4
Order Entry Client System
To OrderProcessor
Figure 13-8. The wiring diagram of the client component The client logic is contained in a component called Order Entry. Each of the five output signals of WorkerOrderEntry represents a different use case. The diagram is laid out so that WorkerOrderEntry notifications all flow from left to right, from worker to coordinator to router to server. For example, when the user changes the selected car style, a GetColors signal is passed through the coordinator to the router to the server. The signal retrieves a list of colors, which the worker then puts in the Colors drop-down list. Tables 13-1 through 13-3 show the pin legends for each of the main objects in Figure 13-8.
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