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End States
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The last core state type needed to complete the example flow is the end state. End states simply terminate the executing flow when entered. Once the execution of a flow is terminated, any allocated resources in flow scope are automatically cleaned up. The execution cannot come back; it is only possible to start a new, completely independent execution.
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Note The exception to this is if the ending flow is being used as a subflow, in which case the flow that
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spawned the subflow is expected to resume execution. For more information on subflows, consult 12.
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CHAPTER 11 INTRODUCTION TO SPRING WEB FLOW
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End states effectively define possible flow outcomes (see Listing 11-12). In the Purchase Product flow there are two possible outcomes: cancel and showCostConfirmation. Listing 11-12. /WEB-INF/flows/purchase-flow.xml Containing End States <flow start-state="enterPurchaseInformation"> <view-state id="enterPurchaseInformation" view="purchaseForm"> <entry-actions> <action bean="formAction" method="setupForm"/> </entry-actions> <transition on="submit" to="requiresShipping"> <action bean="formAction" method="bindAndValidate"/> </transition> <view-state> <decision-state id="requiresShipping"> <if test="${flowScope.purchase.shipping}" then="enterShippingDetails" else="placeOrder"/> </decision-state> <view-state id="enterShippingDetails" view="shippingForm"> <transition on="submit" to="placeOrder"> <action bean="sellItemAction" method="bindAndValidate"/> </transition> </view-state> <action-state id="placeOrder"> <action bean="orderClerk" method="placeOrder(${flowScope.purchase})"/> <transition on="success" to="showCostConfirmation"/> </action-state> <end-state id="showCostConfirmation" view="costConfirmation"/> <end-state id="cancel" view="home"/> <import resource="purchase-flow-context.xml"/> </flow> End states can optionally select ending or confirmation views that should be rendered when they are entered. In this scenario, the showCostConfirmation state selects the costConfirmation view, which will display a summary of the purchase order cost after order placement. End states may also be used to trigger redirects after flow, which is a common pattern to further restrict accidental Back button usage by redirecting the user to a new browser URL.
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The Purchase Product Flow: What s Next
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At this point, the purchase order flow has been fully implemented. Listing 11-12 contains a human-readable, self-contained definition that fully encapsulates the navigation rules for the purchase product use case allowing you to change navigation rules without impacting anything else in the system. This module can now be fully tested out of the container and readied for deployment within the container.
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CHAPTER 11 INTRODUCTION TO SPRING WEB FLOW
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Spring MVC Deployment
To deploy the flow for execution within a Spring MVC environment, you need to define a FlowController which is a special type of org.springframework.web.servlet.mvc.Controller. One FlowController will typically manage the execution of all flows within an application.
The FlowController
A FlowController serves as an Adapter (http://en.wikipedia.org/wiki/Adapter_pattern) between Spring MVC and Spring Web Flow (it has knowledge of both systems). A FlowController exposes a set of managed flow executions for execution at a specific request URL. Listing 11-13. Spring MVC DispatcherServlet Configuration <bean name="/purchase.htm" class="org.springframework.webflow.manager.mvc. FlowController"> <constructor-arg ref="flowRegistry"/> </bean> Spring MVC will now route requests for the /purchase.htm URL to the org.springframework. webflow.mvc.FlowController. As you can see, the Controller needs a reference to a flowRegistry, which contains the flow definitions that are eligible for execution.
FlowRegistry
A FlowRegistry (see Listing 11-14) is a dictionary of flow definitions eligible for execution. Flow definitions placed in a registry are indexed by their identifiers. By default, the filename of the flow definition, minus the file extension, is treated as the flow id. Listing 11-14. /WEB-INF/flow.xml Including the purchaseFlow <bean name="flowRegistry" class="org.springframework.webflow.registry.XmlFlowRegistryFactoryBean"> <property name="flowLocations"> <list> <value>/WEB-INF/flow/purchase-flow.xml</value> </list> </property> </bean> As you define new flow definitions, you simply add them as new flow locations. Wildcard matches are also supported, building on Spring s ResourceArrayPropertyEditor. See Listing 11-15.
CHAPTER 11 INTRODUCTION TO SPRING WEB FLOW
Listing 11-15. /WEB-INF/flow.xml Including All Available Flows <bean name="flowRegistry" class="org.springframework.webflow.registry.XmlFlowRegistryFactoryBean"> <property name="flowLocations" value="/WEB-INF/flows/**/*-flow.xml"> </bean> If needed, flow definitions may also be explicitly assigned identifiers and additional, custom properties when registered.
Additional Configuration
A FlowController plus a FlowRegistry are the only required deployment artifacts for executing flow definitions within a Spring MVC environment. If you need more power for example, you wish to control the way in which flow executions are stored or observe the life cycle of certain flows there are additional objects that may be configured, but that configuration is entirely optional.
Spring Web Flow provides meaningful defaults, but still gives you the power to customize and extend Tip
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