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Design ejb design patterns phần 9

Khi sử dụng Container-Managed Persistence đậu thực thể (CMP), nó là một cộng với chính mà các container có thể xử lý tất cả các logic kiên trì và lập bản đồ O / R, cũng như dữ liệu bộ nhớ đệm, thay mặt cho nhà phát triển. | Pattern Code Listing 209 public void setWithdrawAccountID String withdrawAccountID this.withdrawAccountID withdrawAccountID public void setDepositAccountID String depositAccountID this.depositAccountID depositAccountID public void setTransferAmount double transferAmount this.transferAmount transferAmount public double getDepositAccountBalance return depositAccountBalance public double getWithdrawAccountBalance return withdrawAccountBalance public TransferFundsCommand Command Superclass package examples.command import java.io.Serializable public abstract class Command implements Serializable public abstract void execute throws CommandException Commandserver Session Bean package examples.command import javax.ejb. import java.rmi.RemoteException import javax.naming. public class CommandServerBean implements SessionBean SessionContext ctx 210 Appendix public void CommandServer public Command executeCommand Command aCommand throws CommandException try aCommand.execute catch CommandException e ctx.setRollbackOnly throw e return aCommand public void ejbActivate throws EJBException java.rmi.RemoteException public void ejbCreate throws CreateException public void ejbPassivate throws EJBException java.rmi.RemoteException public void ejbRemove throws EJBException java.rmi.RemoteException public void setSessionContext final SessionContext p1 throws EJBException java.rmi.RemoteException this.ctx p1 CommandException package examples.command public class CommandException extends Exception Exception wrappedException public CommandException public CommandException Exception e this.wrappedException e Pattern Code Listing 211 Exception getWrappedException return wrappedException public CommandException String s super s CommandTarget Interface package examples.command interface CommandTarget Command executeCommand Command aCommand throws CommandException EJBCommandTarget package examples.command import javax.rmi.PortableRemoteObject import javax.ejb.CreateException import .