asp.net ean 128

asp.net gs1 128

asp.net ean 128

asp.net ean 128

asp.net gs1 128

asp.net gs1 128,

asp.net ean 128,
asp.net gs1 128,

asp.net ean 128,

asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,

asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,

asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net ean 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net ean 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net gs1 128,
asp.net ean 128,
asp.net gs1 128,

3.3.2 The BidderAccountCreatorBean example The process to create an ActionBazaar bidder account is too involved to be implemented as a single-step action. As a result, account creation is implemented as a multistep process. At each step of the workflow, the would-be bidder enters digestible units of data. For example, the bidder may enter username/password information first; then biographical information such as name, address, and contact information; then billing information such as credit card and bank account data; and so forth. At the end of a workflow, the bidder account is created or the entire task is abandoned. This workflow is depicted in figure 3.7.

Figure 12-2. Application of the i18n aspect to the Swing Java client of Duke s Bank With the previous aspect, the internationalized exceptions are sent to the client. The client does not have to handle this concern itself. For instance, the createActInf method of the administration client can be simplified as shown in Listing 12-14. Listing 12-14. Aspectizing the Administration Client with the i18n Aspect // excerpt of aop.j2ee.client.java.aspectized.DataModel [...] protected void createActInf(int currentFunction, String returned) { AccountDetails details= null; if ((currentFunction == 4) && (returned.length() > 0)) { try { details= bank.getAccountDetails(returned);

Figure 3.7 The ActionBazaar bidder account creation process is broken up into multiple steps: entering username/password, entering biographical information, entering billing information, and finally creating the account. This workflow could be implemented as a stateful session bean.

ejbContext.setRollbackOnly();

Each step of the workflow is implemented as a method of the BidderAccountCreatorBean presented in listing 3.2. Data gathered in each step is incrementally cached into the stateful session bean as instance variable values. Calling either the cancelAccountCreation or createAccount method ends the workflow. The createAccount method creates the bidder account in the database and is supposed to be the last normal step of the workflow. The cancelAccountCreation method, on the other hand, prematurely terminates the process when called by the client at any point in the workflow and nothing is saved into the database. The full version of the code is available for download in the zip containing code examples from this book s website.

@Stateful(name="BidderAccountCreator") public class BidderAccountCreatorBean implements BidderAccountCreator {

For BMT beans, use one of the rollback methods in the UserTransaction object acquired from the container. The rollback() method tells the container to start a rollback immediately, while the setRollbackOnly() method only marks the transaction for rollback (which will occur after the EJB method completes). Ultimately, these methods will cause the current transaction to be rolled back and undo any updates that were performed. Collectively, they can throw three different exceptions:

boolean readonly= true; frame.setDescription(details.getDescription()); ArrayList alist= new ArrayList(); alist= details.getCustomerIds(); frame.createActFields( readonly, details.getType(), details.getBalance(), details.getCreditLine(), details.getBeginBalance(), alist, details.getBeginBalanceTimeStamp()); // exception messages are already internationalized by the i18n aspect } catch (AccountNotFoundException ex) { frame.resetPanelTwo(); frame.messlab3.setText(ex.getMessage()); } catch (RemoteException ex) { frame.messlab.setText(ex.getMessage()); } catch (InvalidParameterException ex) { frame.messlab.setText(ex.getMessage()); } } } The client can access the original exception by using the ex.getCause method. After Java 1.4, the cause of the exception is also included in the stack trace and is shown by the ex.printStackTrace method below the caused by line. This works only if the aspect passes the original exception as a parameter while constructing the internationalized exception (see lines 18, 21, and 36 of the i18n aspect).

@Resource(name="jdbc/ActionBazaarDS") private DataSource dataSource; private LoginInfo loginInfo; private BiographicalInfo biographicalInfo; private BillingInfo billingInfo; private Connection connection; public BidderAccountCreatorBean () {} @PostConstruct Receives PostConstruct callback @PostActivate Receives PostActivate public void openConnection() { callback try { connection = dataSource.getConnection(); } catch (SQLException sqle) { sqle.printStackTrace(); } }

public void addLoginInfo(LoginInfo loginInfo) { this.loginInfo = loginInfo; } public void addBiographicalInfo( BiographicalInfo biographicalInfo) { this.biographicalInfo = biographicalInfo; } public void addBillingInfo(BillingInfo billingInfo) { this.billingInfo = billingInfo; } @PrePassivate Receives PrePassivate callback @PreDestroy Receives PreDestroy public void cleanup() { callback try { connection.close(); connection = null; } catch (SQLException sqle) { sqle.printStackTrace(); } }

SecurityException Thrown by the rollback() method if the thread using the UserTransaction is not allowed to perform a rollback IllegalStateException Thrown if the current thread is not associated

@Remove public void cancelAccountCreation() { loginInfo = null; biographicalInfo = null; billingInfo = null; } @Remove