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CHAPTER 11 USING AOP WITHIN THE SAMPLE APPLICATION S BUSINESS TIER
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Business Tier Improvement: Beyond Design Patterns
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Certain concerns can be crosscutting to the business tier and difficult to handle with J2EE design patterns. With these concerns, the GoF design patterns may be useful. As stated in 8, concerns not compatible with design patterns can often be implemented by using AOP. Indeed, AOP often offers simpler solutions than those proposed by design patterns. In this section, we study a solution for modularizing reference resolving and preconditions in the context of our case study, the banking application.
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Resolving Object References
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Resolving object references is usually implemented through a well-defined protocol that allows the search based on certain criterions. Within the EJB context, the Home interface defines this protocol, which is implemented by the EJB. Listing 11-6 illustrates the protocol for the account business object. Listing 11-6. The Home Interface of Account package aop.j2ee.business.entity.account; 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 import import import import import java.util.*; java.math.*; javax.ejb.*; java.rmi.RemoteException; aop.j2ee.commons.exception.MissingPrimaryKeyException;
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public interface AccountHome extends EJBHome { public Account create (String accountId, String type, String description, BigDecimal balance, BigDecimal creditLine, BigDecimal beginBalance, Date beginBalanceTimeStamp, ArrayList customerIds) throws RemoteException, CreateException, MissingPrimaryKeyException; public Account findByPrimaryKey(String accountId) throws FinderException, RemoteException; public Collection findByCustomerId(String customerId) throws FinderException, RemoteException; } // AccountHome
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The create method allows for the creation of a new account by a client object. For instance, the Bank session EJB uses this method in the implementation of createAccount. It is a typical method for a Home interface. The findByPrimaryKey(String) method is also a classical method. It allows the client objects to access a given account instance through its primary key. Finally, findByCustomerId(String customerId) reveals the relation between the customers
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CHAPTER 11 USING AOP WITHIN THE SAMPLE APPLICATION S BUSINESS TIER
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(Customer) and the accounts (Account). This method is used to access the customer s accounts. For each relation between the EJB, a similar method can be defined in the Home interface. The use of the Home interface implies a dependency to the EJB model. Even though it is a light dependency, it has a crosscutting effect because each client object (typically a session EJB such as Bank and TxController) must implement the Home interface accessing code, which uses some EJB and JNDI primitives. The technological dependency can be reduced by using the locator pattern. However, then the use of the locator itself becomes a crosscutting concern and requires additional design efforts. In order to illustrate the complications related to reference resolving, we use our original design of the Duke s Bank example, which does not use the service locator pattern. Let us refer again to the TxController session EJB implementation. Remember that the account resolving is implemented in the checkAccountArgsAndResolve method, as shown in Listing 11-7. Listing 11-7. The checkAccountArgsAndResolve Method 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 private Account checkAccountArgsAndResolve( BigDecimal amount,String description,String accountId) throws InvalidParameterException, AccountNotFoundException { Account account = null; if (description == null) throw new InvalidParameterException("null description"); if (accountId == null) throw new InvalidParameterException("null accountId"); if (amount.compareTo(bigZero) != 1) throw new InvalidParameterException("amount <= 0"); try { account = accountHome.findByPrimaryKey(accountId); } catch (Exception ex) { throw new AccountNotFoundException(accountId); } return account; } // checkAccountArgsAndResolve
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The accountHome field (line 13) has been initialized with other similar fields when the EJB was created, as shown at line 4 of Listing 11-8. Listing 11-8. The EJBCreate Method 01 02 03 04 05 06 07 08 public void ejbCreate() { try { txHome = EJBGetter.getTxHome(); accountHome = EJBGetter.getAccountHome(); } catch (Exception ex) { throw new EJBException("ejbCreate: " + ex.getMessage()); } } // ejbCreate The EJBGetter class factorizes the EJB Home resolving code, as shown in Listing 11-9.
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