asp.net code 39

code 39 barcode generator asp.net

asp.net code 39 barcode

asp.net code 39

asp.net code 39 barcode

asp.net code 39,

code 39 barcode generator asp.net,
asp.net code 39,

code 39 barcode generator asp.net,

asp.net code 39 barcode,
asp.net code 39 barcode,
code 39 barcode generator asp.net,
asp.net code 39,
code 39 barcode generator asp.net,

asp.net code 39,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39,
asp.net code 39,
asp.net code 39,
asp.net code 39 barcode,
asp.net code 39 barcode,
asp.net code 39 barcode,
asp.net code 39,
code 39 barcode generator asp.net,
code 39 barcode generator asp.net,
asp.net code 39,
asp.net code 39,
asp.net code 39 barcode,
code 39 barcode generator asp.net,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39,
asp.net code 39 barcode,
code 39 barcode generator asp.net,

asp.net code 39,
asp.net code 39,
code 39 barcode generator asp.net,
code 39 barcode generator asp.net,
asp.net code 39,
asp.net code 39,
asp.net code 39 barcode,
asp.net code 39 barcode,
code 39 barcode generator asp.net,
asp.net code 39 barcode,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39 barcode,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39,
asp.net code 39 barcode,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39 barcode,
code 39 barcode generator asp.net,
code 39 barcode generator asp.net,
asp.net code 39 barcode,
code 39 barcode generator asp.net,
asp.net code 39,
asp.net code 39,
code 39 barcode generator asp.net,
code 39 barcode generator asp.net,
asp.net code 39 barcode,
code 39 barcode generator asp.net,
asp.net code 39,
asp.net code 39,
asp.net code 39 barcode,
asp.net code 39 barcode,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39 barcode,
asp.net code 39,
asp.net code 39 barcode,
asp.net code 39 barcode,
code 39 barcode generator asp.net,
asp.net code 39,
code 39 barcode generator asp.net,
asp.net code 39,
code 39 barcode generator asp.net,
code 39 barcode generator asp.net,
asp.net code 39 barcode,

Lines 24, 26, 29, and 32 show where the application accesses the international messages, which are indexed by string keys. As demonstrated, internationalization is a crosscutting concern, which can be difficult to handle. In addition, maintenance is more difficult since the accesses are scattered in the client code and closely tangled with exception handling. The externalization of the error handling concern in the internationalization context is performed in the i18n aspect. However, the internationalization concern must also deal with issues such as measurement units, currencies, and labels in graphical components. The i18n aspect shown in Listing 12-13 is the first step toward a modular internationalization. Listing 12-13. A Simple Internationalization Aspect 01 02 03 04 05 package aop.j2ee.client.java.aspect; import java.rmi.RemoteException; import aop.j2ee.commons.exception.*; import aop.j2ee.client.java.aspectized.BankAdmin;

If you are using bean-managed transactions, you should use the methods in the UserTransaction class. Acquire the UserTransaction instance from the EJBContext set in your EJB (see recipe 5.2 for more information). From the UserTransaction, use one of the following methods:

Figure 3.6 Stateful bean session maintenance. There is a bean instance reserved for a client and each instance stores the client s state information. The bean instance exists until either removed by the client or timed out.

We describe a use case of our ActionBazaar application and implement it using a stateful session bean. We show you additional programming rules for stateful session beans, and then we examine stateful bean lifecycle callback methods and the @Remove annotation. Finally, we summarize differences between stateless and stateful session beans. However, before we jump into code, let s briefly examine the rules specific to developing a stateful session bean.

transaction.rollback(); transaction.setRollbackOnly();

3.3.1 Additional programming rules In section 3.1.3, we discussed the programming rules that apply to all session beans. Stateful session beans have a few minor twists on these rules:

06 07 public privileged aspect I18n { 08 09 // translation of common exception messages 10 Object around() throws RemoteException, InvalidParameterException: 11 call(* aop.j2ee.business.session.bank.Bank+.*(..) throws *Exception) 12 && within(aop.j2ee.client.java.aspectized.*+) { 13 14 Object value = null; 15 try { 16 value = proceed(); 17 } catch (RemoteException ex) { 18 throw new RemoteException(BankAdmin.messages.getString( 19 "Remote Exception"),ex); 20 } catch (InvalidParameterException ex) { 21 throw new InvalidParameterException(BankAdmin.messages.getString( 22 "InvalidParameterException"),ex); 23 } 24 return value; 25 } 26 27 // handling of joinpoint-specific exceptions 28 Object around(String accountId) throws AccountNotFoundException: 29 call(* aop.[...].Bank+.getAccountDetails(String) throws *Exception) 30 && args(accountId) && within(aop.j2ee.client.java.aspectized.*+) { 31 32 Object value = null; 33 try { 34 value = proceed(accountId); 35 } catch (AccountNotFoundException ex) { 36 throw new AccountNotFoundException( 37 BankAdmin.messages.getString("AccountException") 38 + " " + accountId + " " 39 + BankAdmin.messages.getString("NotFoundException"),ex); 40 } 41 return value; 42 } 43 44 [...] // other specific exceptions 45 } For each exception thrown, the aspect builds a new exception that contains an internationalized message (lines 18, 21, and 36) in order to modularize the management of error message internationalization. Figure 12-2 gives an overview of where the aspect is applied by showing the advised calls within the bank administration client (see aop.j2ee.client.java.aspectized.DataModel).

Stateful bean instance variables used to store conversational state must be Java primitives or Serializable objects. We ll talk more about this requirement when we cover passivation. Since stateful session beans cannot be pooled and reused like stateless beans, there is a real danger of accumulating too many of them if we don t have a way to destroy them. Therefore, we have to define a business method for removing the bean instance by the client using the @Remove annotation. We ll talk more about this annotation soon. In addition to the PostConstruct and PreDestroy lifecycle callback methods, stateful session beans have the PrePassivate and PostActivate lifecycle callback methods. A PrePassivate method is invoked before a stateful bean instance is passivated and PostActivate is invoked after a bean instance is brought back into the memory and is method ready.

On the other hand, if your bean uses container-managed transactions, it must use the following method of the EJBContext :

You ll see these rules applied when we explore a concrete stateful session beans example next. As we did for stateless beans, we ll utilize the example as a jumping-off point to detail stateful features.