import javax.ejb.*;
import java.rmi.*;

public interface TellerHome extends EJBHome {

 Teller create () throws RemoteException, CreateException;
}

import javax.ejb.*;
import java.rmi.*;
import java.util.*;

public interface Teller extends EJBObject {

 public Checkings createCheckingsAccount (String name, double amount)throws RemoteException, CreateException;
 public Savings createSavingsAccount (String name, double amount)throws RemoteException, CreateException;
 public int getNextCheckings (CheckingsHome home)throws RemoteException;
 public int getNextSavings (SavingsHome home) throws RemoteException;
 public void TransferMoney (double amount, int fromAcct, int toAcct)throws RemoteException;
 public Checkings getCheckings (int acc) throws RemoteException, FinderException;
 public Savings getSavings (int acc) throws RemoteException, FinderException;
 public Vector getCheckingsList () throws RemoteException;
 public Vector getSavingsList () throws RemoteException;
}

import javax.ejb.*;
import javax.naming.*;
import javax.transaction.UserTransaction;
import java.rmi.*;
import java.util.*;
 

public class TellerBean implements SessionBean {
 
  public static final int INVALID_ACCOUNT = -1;

  SessionContext ctx;

  public CheckingsHome checkingsHome;
  public SavingsHome   savingsHome;
 
  public Vector     checkingsList = null;
  public Vector     savingsList   = null;
  public final int  checkingsBase = 10;
  public final int  savingsBase   = 10000;
  public int        lastCheckings = checkingsBase;
  public int        lastSavings   = savingsBase;

  public Checkings createCheckingsAccount (String name, double amount)
    throws RemoteException, CreateException {
    ++lastCheckings;
    return checkingsHome.create (lastCheckings, name, amount);
  }

  public Savings createSavingsAccount (String name, double amount)
    throws RemoteException, CreateException {
    ++lastSavings;
    return savingsHome.create (lastSavings, name, amount);
  }
 
  public int getNextCheckings (CheckingsHome home) throws RemoteException {
    checkingsList = new Vector ();
    int i = checkingsBase;
    for (i = i+1; ; i++) {
      if ( i == savingsBase ) {
        return TellerBean.INVALID_ACCOUNT;
      }
      try {
        CheckingsPK key = new CheckingsPK ( i );
        Checkings found = home.findByPrimaryKey ( key );
        if (found == null) {
          break;
        }
        System.out.println ("======================================================");
        System.out.println ( "Key: "+ key.account_number +
                            " Account No = "+found.getAccountNumber()+
                            " Name = "+found.getCustomerName()+
                            " Balance = " + found.getBalance() );
        System.out.println ("======================================================");
        checkingsList.addElement (key);

      } catch (Exception e) { break; }

    }
    return i;
 
  }

  public int getNextSavings (SavingsHome home) throws RemoteException {
    savingsList = new Vector ();
    int i = savingsBase;
    for (i = i+1; ; i++) {
      if ( i == checkingsBase ) {
        return TellerBean.INVALID_ACCOUNT;
      }
      try{
        SavingsPK key = new SavingsPK ( i );
        Savings found = home.findByPrimaryKey ( key );
        if (found == null) {
          break;
        }
        System.out.println ("======================================================");
        System.out.println ( "Key: "+ key.account_number +
                            " Account No = "+found.getAccountNumber()+
                            " Name = "+found.getCustomerName()+
                            " Balance = " + found.getBalance() );
        System.out.println ("======================================================");
        savingsList.addElement (key);

      } catch (Exception e) { break; }

    }
    return i;
 
  }

  public Vector getCheckingsList () throws RemoteException {
    return checkingsList;
  }

  public Vector getSavingsList () throws RemoteException {
    return savingsList;
  }
 
  public void TransferMoney(double amount, int fromAccount, int toAccount)
    throws RemoteException {
    Checkings fromCheckings = null, toCheckings = null;
    Savings fromSavings = null, toSavings = null;
    try{
      if (fromAccount < savingsBase) {
        fromCheckings = getCheckings (fromAccount);
        fromCheckings.debit (amount);
      }
      else {
        fromSavings = getSavings (fromAccount);
        fromSavings.debit (amount);
      }
      if (toAccount < savingsBase) {
        toCheckings = getCheckings (toAccount);
        toCheckings.credit (amount);
      }
      else {
        toSavings = getSavings (toAccount);
        toSavings.credit (amount);
      }
 
    }catch (Exception e) {System.out.println (e);}
  }

  public Checkings getCheckings (int acc)
    throws RemoteException, FinderException {
    return checkingsHome.findByPrimaryKey (new CheckingsPK (acc));
  }

  public Savings getSavings (int acc)
    throws RemoteException, FinderException {
    return savingsHome.findByPrimaryKey (new SavingsPK (acc));
  }
 
  public void ejbCreate()   { }
  public void ejbActivate() { }
  public void ejbPassivate(){ }
  public void ejbRemove()   { }

  public void setSessionContext (SessionContext ctx)
    throws RemoteException {
    this.ctx = ctx;
    try {
      checkingsHome = (CheckingsHome) Naming.lookup ("Checkings");
      savingsHome  = (SavingsHome) Naming.lookup ("Savings");
      lastCheckings = getNextCheckings (checkingsHome);
      lastSavings = getNextSavings (savingsHome);
    }
    catch (Exception ex) {
      throw new RemoteException ("Could not find Accounts", ex);
    }
  }
}

  <!---------------------------------------------------------->
  <!------- Checkings Entity Bean             ---------------->
  <!---------------------------------------------------------->

  <entity-bean
    name="Checkings"
    descriptor="Bank/CheckingsDeployment"
    package="Bank"
    home="Bank.CheckingsHome"
    remote="Bank.Checkings"
    bean="Bank.CheckingsBean"
    primary-key="Bank.CheckingsPK"
    tx-attribute="TX_SUPPORTS"
  >
    <property
      name="databasePassword"
      value="mouse"
    />
    <property
      name="dataSourceName"
      value="Checkings"
    />
    <property
      name="databaseUser"
      value="user"
    />
    <property
      name="databaseTable"
      value="checkings"
    />
    <container-managed
      storage-helper="com.ejbhome.generator.helpers.RelationalPersistenceCodeHelper"
      table="checkings"
      data-source="Checkings"
      user="user"
      password="mouse"
    >
      <field
        name="balance"
      />
      <field
        name="customer_name"
      />
      <field
        name="account_number"
      />
    </container-managed>
  </entity-bean>

  <!---------------------------------------------------------->
  <!------- Savings Entity Bean               ---------------->
  <!---------------------------------------------------------->

  <entity-bean
    name="Savings"
    descriptor="Bank/SavingsDeployment"
    package="Bank"
    home="Bank.SavingsHome"
    remote="Bank.Savings"
    bean="Bank.SavingsBean"
    primary-key="Bank.SavingsPK"
    tx-attribute="TX_SUPPORTS"
  >
    <property
      name="databasePassword"
      value="mouse"
    />
    <property
      name="dataSourceName"
      value="Checkings"
    />
    <property
      name="databaseUser"
      value="user"
    />
    <property
      name="databaseTable"
      value="savings"
    />
    <container-managed
      storage-helper="com.ejbhome.generator.helpers.RelationalPersistenceCodeHelper"
      table="savings"
      data-source="Checkings"
      user="user"
      password="mouse"
    >
      <field
        name="balance"
      />
      <field
        name="customer_name"
      />
      <field
        name="account_number"
      />
    </container-managed>
  </entity-bean>

  <!---------------------------------------------------------->
  <!------- Teller Session Bean               ---------------->
  <!---------------------------------------------------------->

  <session-bean
    name="Teller"
    descriptor="Bank/TellerDeployment"
    package="Bank"
    home="Bank.TellerHome"
    remote="Bank.Teller"
    bean="Bank.TellerBean"
    type="stateful"
    timeout="3484"
    tx-attribute="TX_SUPPORTS"
  >
  </session-bean>
 
</ejbml>