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Class examples.ejb.basic.beanManaged.AccountBean

examples.ejb.basic.beanManaged.AccountBean

public class AccountBean

• EJBean-managed persistence and transactions; the code in this file directly accesses the data storage.
• Application-defined exceptions.

AccountBean()

 

balance()

Returns current balance.

deposit(double)

Adds amount to balance.

ejbActivate()

Required by the EJB specification, this method is not used by this example.

ejbCreate(String, double)

This method corresponds to the create method in the home interface "AccountHome.java".

ejbFindBigAccounts(double)

Finds all EJBeans with a balance greater than a given amount.

ejbFindByPrimaryKey(String)

Attempts to find the EJBean with a given Primary Key from the persistent storage.

ejbLoad()

Loads the EJBean from the persistent storage.

ejbPassivate()

This method is required by the EJB Specification, but is not used by this example.

ejbPostCreate(String, double)

Required by the EJB specification, this method is not used by this example.

ejbRemove()

Deletes the EJBean from the persistent storage.

ejbStore()

Stores the EJBean in the persistent storage.

setEntityContext(EntityContext)

Sets the EntityContext for the EJBean.

unsetEntityContext()

Unsets the EntityContext for the EJBean.

withdraw(double)

Subtracts amount from balance.

public AccountBean()

public void setEntityContext(javax.ejb.EntityContext ctx)

          Sets the EntityContext for the EJBean.

Parameters:

ctx - EntityContext

public void unsetEntityContext()

          Unsets the EntityContext for the EJBean.

public void ejbActivate()

          Required by the EJB specification, this method is not used by this example.

public void ejbPassivate()

          This method is required by the EJB Specification, but is not used by this example.

public void ejbLoad()

          Loads the EJBean from the persistent storage.

Throws:

javax.ejb.NoSuchEntityException - if the bean is not found in the database

javax.ejb.EJBException - if there is a communications or systems failure

public void ejbStore()

          Stores the EJBean in the persistent storage.

Throws:

javax.ejb.NoSuchEntityException - if the bean is not found in the database

javax.ejb.EJBException - if there is a communications or systems failure

public java.lang.String ejbCreate(java.lang.String accountId,
                        double initialBalance) throws javax.ejb.CreateException

          This method corresponds to the create method in the home interface "AccountHome.java". The parameter sets of the two methods are identical. When the client calls AccountHome.create(), the container allocates an instance of this bean and calls AccountBean.ejbCreate().

For bean-managed persistence, ejbCreate() returns a primary key, unlike the case of container-managed persistence, where it returns a void.

Parameters:

accountID - String Account ID

initialBalance - double Initial Balance

Returns:

String Primary Key

Throws:

javax.ejb.CreateException - if there is a problem creating the bean

javax.ejb.DuplicateKeyException - if a create is attempted using a Primary Key already in the database

javax.ejb.EJBException - if there is a communications or systems failure

public void ejbPostCreate(java.lang.String accountId,
                          double initialBalance)

          Required by the EJB specification, this method is not used by this example.

Parameters:

accountID - String Account Identification

initialBalance - double Initial Balance

public void ejbRemove()

          Deletes the EJBean from the persistent storage.

Throws:

javax.ejb.NoSuchEntityException - if the bean is not found in the database

javax.ejb.EJBException - if there is a communications or systems failure

public java.lang.String ejbFindByPrimaryKey(java.lang.String pk) throws javax.ejb.ObjectNotFoundException

          Attempts to find the EJBean with a given Primary Key from the persistent storage.

Parameters:

pk - String Primary Key

Returns:

String Primary Key

Throws:

javax.ejb.ObjectNotFoundException - thrown if the EJBean cannot be found

javax.ejb.EJBException - if there is a communications or systems failure

public java.util.Enumeration ejbFindBigAccounts(double balanceGreaterThan)

          Finds all EJBeans with a balance greater than a given amount. Returns an Enumeration of found EJBean primary keys.

Parameters:

balanceGreaterThan - double Test Amount

Returns:

Enumeration EJBean Primary Keys

Throws:

javax.ejb.EJBException - if there is a communications or systems failure

public double deposit(double amount)

          Adds amount to balance.

Parameters:

amount - double Amount

Returns:

double balance

public double withdraw(double amount) throws ProcessingErrorException

          Subtracts amount from balance.

Parameters:

amount - double Amount

Returns:

double Balance

Throws:

ProcessingErrorException - if Amount > Balance.

public double balance()

          Returns current balance.

Returns:

double Balance

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