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public class DistanceAction extends Action { private CityService cityService; public void setCityService(CityService cityService) { this.cityService = cityService; } public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { if (request.getMethod().equals("POST")) { ... double distance = cityService.findDistance(srcCity, destCity);

Note There is no need to check whether the call to bellman_ford succeeded or whether it found a negative cycle (in which case Johnson s algorithm won t work), because if there is a negative cycle in the graph, bellman_ford would raise an exception.



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Since the transaction is being controlled by a transaction manager outside the client, any class involved in a distributed transaction is prohibited from calling any of these methods: commit() rollback() setSavepoint() setAutoCommit(true)





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Committing or rolling back a transaction is entirely under the control of the transaction manager. The client does not need to do anything special other than call the close() method of the Connection interface when it has completed its work. After all the components involved in the transaction have completed, the transaction manager will commit or roll back the transaction. This commit (or rollback) is called a two-phase commit. It has two phases because the transaction manager must poll all the data sources before deciding to commit or roll back. As each data source is polled, it throws an exception if it cannot commit its changes. If no data source throws an exception in the polling phase, the transaction manager instructs the data sources to commit their changes. Suppose we have two clients involved in a distributed transaction. Here s an illustration of how the two-phase commit would proceed: Time T0 T1 Both clients have called close() to signal that they have completed their work. Transaction manager calls the prepare() method of XAResource. There is an XAResource for each data source. If neither XAResource throws an exception, then each is ready to commit. Transaction manager calls the commit() method of each XAResource. This message is passed to each data source, which then commits.

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request.setAttribute("distance", distance); } return mapping.findForward("success"); } } However, this action must be under Spring s management to have its dependencies injected. You can choose to declare it in either applicationContext.xml or another bean configuration file loaded by ContextLoaderPlugin. To better separate business services and web components, I recommend declaring it in action-servlet.xml in the root of WEB-INF, which will be loaded by ContextLoaderPlugin by default, as your ActionServlet instance has the name action. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd"> <bean name="/distance" class="com.apress.springrecipes.city.struts.DistanceAction"> <property name="cityService" ref="cityService" /> </bean> </beans> This action s bean name must be identical to its action path in struts-config.xml. As a <bean> element s id attribute cannot contain the / character, you should use the name attribute instead. In this configuration file, you can refer to beans declared in its parent application context, which is loaded by ContextLoaderListener. In struts-config.xml, you have to register ContextLoaderPlugin to load the preceding bean configuration file. <struts-config> ... <action-mappings> <action path="/distance" name="distanceForm" validate="false"> <forward name="success" path="/WEB-INF/jsp/distance.jsp" /> </action> </action-mappings> <controller processorClass="org.springframework.web.struts. DelegatingRequestProcessor" /> <plug-in className="org.springframework.web.struts.ContextLoaderPlugIn" /> </struts-config> Also, you have to register the Struts request processor DelegatingRequestProcessor to ask Struts to look up its actions from Spring s application context by matching the action path

Assuming the (m lg n) running time for Dijkstra s algorithm, Johnson s is simply a factor of n slower, giving us (mn lg n), which is faster than the cubic running time of Floyd-Warshall (discussed in a bit), for sparse graphs (that is, for graphs with relatively few edges).7 The transform used in Johnson s algorithm closely related to the potential function of the A* algorithm (see Knowing Where You re Going, later in this chapter), and it is very similar to the transform used in the min-cost bipartite matching problem in 10. There, too, the goal is to ensure positive edge weights but in a slightly different situation (edge weights changing from iteration to iteration).

Note that the above would all occur outside the client code. It is entirely handled by the transaction manager. If no data sources throw an exception in the polling phase, the transaction manager tells all the data sources to commit their changes. If any data source throws an exception, all the data sources are notified to roll back the changes. We ve seen in this section how to deal with situations where you are updating more than a single table. These are situations where you might be making numerous changes to a database, and all the changes must succeed for the database to be in a consistent state at the end of the transaction.

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