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Implementation ECC200 in Java DEPLOYING TO J2EE APPLICATION SERVERS

When an instance of the stateless session bean is created, the EJB container sets the factory field to the persistence unit identified by "nameOfMyPu". It also calls the setFactory2() method with the "nameOfAnotherPu" persistence unit. In EJB, an injected EntityManagerFactory is automatically closed by the EJB container when the instance is discarded. In fact, if you call close() on an injected EntityManagerFactory, an IllegalStateException is thrown.
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package org.jboss.ejb3.examples.ch08.statusupdate.mdb; import java.util.logging.Logger; import javax.annotation.PostConstruct; import javax.jms.MessageListener; import org.jboss.ejb3.examples.ch08.statusupdate.api.StatusUpdate; import twitter4j.Twitter; /** * EJB 3.x MDB which will act as an adaptor to the Twitter API, updating * Twitter status on incoming messages. * * The environment must first support Twitter integration by way of a username/ password * pair available from environment properties. {@link EnvironmentSpecificTwitter ClientUtil} * has more details. * * @author <a href="mailto:andrew.rubinger@jboss.org">ALR</a> * @see http://twitter.com * @see http://yusuke.homeip.net/twitter4j/en/index.html */ public class TwitterUpdateMdb extends StatusUpdateBeanBase implements Message Listener { //--------------------------------------------------------------------------|| // Class Members -----------------------------------------------------------|| //--------------------------------------------------------------------------|| /** * Logger */ private static final Logger log = Logger.getLogger(TwitterUpdateMdb.class.get
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<application> <module> EJB module <ejb>actionBazaar-ejb.jar</ejb> </module> <module> <web> Web module <web-uri>actionBazaar.war</web-uri> <context-root>ab</context-root> </web> </module> <module> Application client module <java>actionBazaar-client.jar</java> </module> </application>
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To illustrate the problem of transaction management and AspectJ-based solutions, let s develop a part of a banking system that must use transaction management. First, we will create the system without transaction management so that we can see which actions need to be within a transaction. We will also develop a logging aspect that allows us to observe the activities taking place. 11.1.1 Implementing the core concern In this section, we modify the banking system example introduced in chapter 10 to use JDBC for database persistence. Figure 11.1 shows our example system. The AccountJDBCImpl class is a concrete implementation of the Account interface from listing 10.1. Besides implementing all the methods specified in the interface, it contains a private method for setting balances. The InterAccountTransferSystem class, from listing 10.4, contains a single method for transferring an amount from one account to the other. Before we look at the JDBC implementation of this interface, let s build the helper class (listing 11.1) for creating database connections that we will use in our implementation.
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using System.Diagnostics; System.Diagnostics.Trace.WriteLine(string.Format("Page loaded on {0}", System.DateTime.Now, "Information"); System.Diagnostics.Trace.WriteLine("Failed to connect to database. ", "Critical");
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private int[] retrievePrices(String symbol) { int[] dollars = null; String dbName = "QuoteData"; int dbType = 0x494E5653; //'INVS' int dbCreator = 0x43415454; //'CATT' com.sun.kjava.Database quoteDB = new Database (dbType, dbCreator, Database.READWRITE); if (!quoteDB.isOpen()) { Database.create(0, dbName, dbCreator, dbType, false); quoteDB = new Database (dbType, dbCreator, Database.READWRITE); } boolean found = false;
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The last portion of the impedance mismatch we ll look at is the differences in associations between object and relational models. Associations are probably one of the easiest portions of the mismatch to overcome since both models support this notion. The relational model understands only one type of association: a foreign key reference to a
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if ([elementName compare:@"item"] == NSOrderedSame) { [feedList addObject:currentItem]; [currentItem release]; } else if (currentItem && currentContents) { [currentItem setObject:currentContents forKey:elementName]; currentContents = nil; [currentContents release]; } } - (void)parserDidEndDocument:(NSXMLParser *)parser { [parser release]; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [feedList count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; } if ([[feedList objectAtIndex:indexPath.row] objectForKey:@"title"]) { cell.textLabel.text = [[feedList objectAtIndex:indexPath.row] objectForKey:@"title"]; } if ([[feedList objectAtIndex:indexPath.row] objectForKey:@"link"]) { cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; } return cell; } Calls up - (void)tableView:(UITableView *)tableView web view didSelectRowAtIndexPath:(NSIndexPath *)indexPath { UIWebView *thisInfo = [[UIWebView alloc] init]; [thisInfo loadRequest:[NSURLRequest requestWithURL: [NSURL URLWithString:[[feedList objectAtIndex:indexPath.row] objectForKey:@"link"]]]]; thisInfo.scalesPageToFit = YES; UIViewController *thisVC = [[UIViewController alloc] init]; thisVC.view = thisInfo; thisVC.title = [[feedList objectAtIndex:indexPath.row] objectForKey:@"title"]; [self.navigationController pushViewController:thisVC animated:YES]; [thisInfo release]; [thisVC release]; }
approach has the benefit of requiring little investment, but is labor intensive and doesn t catch bugs in parts of the system that aren t being actively tested. Automatic testing, on the other hand, takes a bit of work up front, but once you write your tests, you have a suite that can be frequently and automatically run, assuring that bugs stay fixed. This chapter is all about writing the automatic tests for your Hibernate projects. We introduce an open source framework, JUnit, which is the de facto standard for writing unit tests in Java. Unit testing is easy for simple cases, but testing persistence layers, like Hibernate, is more complex. This chapter aims to make that easier.
The first difference you ll notice between the applications in this chapter and the ones you ve written up to this point is that Windows applications have a visual component, called a form. The interface you see is the form, and the buttons, text boxes, and other widgets that make up the form are called controls. You build simply by dragging and dropping controls onto a work area. Some code goes into creating the appearance and default behavior of the controls, but all of that is created for you by Visual Studio, and you never have to see it.
Our Spotlet version of the tutorial application is nearly complete. We have a user interface and data being stored to Palm OS databases. What s left to implement In the MIDP version of the tutorial application, we implemented a means, the QuoteService, to connect to the Internet and pull down investment prices. Because KJava runs on top of the CLDC, and because we implemented the Quote Service as generically as possible, we can reuse this service without modification. The foundation of the Quote Service lies in the Generic Connection Framework and the java.io package. While the MIDP offers some enhancements to the GCF, we choose not to use them in order to keep the implementation of the Quote Service as portable as possible. Therefore, in order to get the ObtainQuoteSpotlet connected to the World Wide Web for investment price information, we simply have to have the Spotlet call on the already developed QuoteService. This entails replacing the following line in the penDown() method
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