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</variable-resolver> </application> <managed-bean> <managed-bean-name>distanceBean</managed-bean-name> <managed-bean-class> com.apress.springrecipes.city.jsf.DistanceBean </managed-bean-class> <managed-bean-scope>request</managed-bean-scope> <managed-property> <property-name>cityService</property-name> <value>#{cityService}</value> </managed-property> </managed-bean> </faces-config> The scope of DistanceBean is request, which means a new bean instance will be created on each request. Note that by registering the variable resolver DelegatingVariableResolver, you can easily refer to a bean declared in Spring s application context as a JSF variable in the form of #{beanName}. This variable resolver will first attempt to resolve variables from the original JSF variable resolver. If a variable cannot be resolved, this variable resolver will look up Spring s application context for a bean with the same name. Now you can deploy this application to your web container and access it through the URL http://localhost:8080/city/distance.faces. Declaring JSF Managed Beans in Spring s Bean Configuration File By registering DelegatingVariableResolver, you can refer to beans declared in Spring from JSF managed beans. However, they are managed by two different containers: JSF s and Spring s. A better solution is to centralize them under the management of Spring s IoC container. Let s remove the managed bean declaration from the JSF configuration file and add the following Spring bean declaration in applicationContext.xml: <bean id="distanceBean" class="com.apress.springrecipes.city.jsf.DistanceBean" scope="request"> <property name="cityService" ref="cityService" /> </bean> To enable the request bean scope in Spring s application context, you have to register RequestContextListener in the web deployment descriptor. <web-app ...> <listener> <listener-class> org.springframework.web.context.ContextLoaderListener </listener-class> </listener>



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We need to show that keeping up will yield an optimal solution, and we can do so by contradiction: if the greedy algorithm is not optimal, then m > k For every r, including r = k, we know that ir finishes at least as early as jr Because m > k, there must be an interval jr+1 that we didn t use This must start after jr , and therefore after ir , which means that we could have and, indeed, would have included it In other words, we have a contradiction..

"another room, or another date"); } else { System.out.println("Calling commit for user A"); conn.commit(); } } } catch (SQLException e) { e.printStackTrace(DriverManager.getLogWriter()); System.out.println(e.getErrorCode()); System.out.println(e.getMessage()); } finally { JDBCManager.close(pstmt); JDBCManager.close(rsetA); JDBCManager.close(stmtA); } } }

<listener> <listener-class> org.springframework.web.context.request.RequestContextListener </listener-class> </listener> ... </web-app>





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Now we create the PessimisticLockerB class. This class simply queries the table and attempts to update it:

which we ll keep updating by looking for shortcuts In many ways, the result is very much (though not exactly) like a two-dimensional version of the Bellman-Ford algorithm (see Listing 9-6) Listing 9-6 The Floyd-Warshall Algorithm, Distances Only def floyd_warshall(G): D = deepcopy(G) # No intermediates yet for k in G: # Look for shortcuts with k for u in G: for v in G: D[u][v] = min(D[u][v], D[u][k] + D[k][v]) return D You ll notice that I start out using a copy of the graph itself as a candidate distance map That s because we haven t tried to go via any intermediate nodes yet, so the only possibilities are direct edges, given by the original weights Also notice that the assumption about the vertices being numbers is completely gone, as we no longer need to explicitly parametrize which stage we re in.

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package Ch07; import java.sql.*; import java.io.*; public class PessimisticLockerB { static Connection conn; static Statement stmt; static Statement stmtB; static PreparedStatement pstmt; static ResultSet rsetB; static String sqlUpdate = "update RESERVE set RES_FLAG= , " + "RES_NAME= WHERE ROOMID= AND RES_DATE= "; static String sqlSelect = "select ROOMID, RES_DATE, " + "RES_FLAG, RES_NAME from RESERVE WHERE RES_FLAG=false FOR UPDATE"; static String roomName; static java.sql.Date roomDate; public static void main(String[] args) { try { String url = "jdbc:pointbase:server://localhost/pointbaseDB"; String username = "PBPUBLIC"; String password = "PBPUBLIC"; conn = JDBCManager.getConnection(url, username, password, false); System.out.println("conn autocommit is " + conn.getAutoCommit()); userBQueryAndUpdate(); } catch (Exception e) { e.printStackTrace(); } finally { JDBCManager.close(conn); } }

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static void userBQueryAndUpdate() throws SQLException { System.out.println("User B is querying for rooms"); try { stmtB = conn.createStatement(); rsetB = stmtB.executeQuery(sqlSelect); if (rsetB.next()) { System.out.println("User B is reserving room"); pstmt = conn.prepareStatement(sqlUpdate); pstmt.setBoolean(1, true); pstmt.setString(2, "User B"); pstmt.setString(3,rsetB.getString(1)); pstmt.setDate(4, rsetB.getDate(2)); pstmt.executeUpdate(); System.out.println("Calling commit for user B"); conn.commit(); } else { System.out.println("User B found no available rooms"); } } catch (SQLException e) { e.printStackTrace(); System.out.println(e.getErrorCode()); System.out.println(e.getMessage()); } finally { JDBCManager.close(pstmt); JDBCManager.close(rsetB); JDBCManager.close(stmtB); } } }

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