Interfaces and classes for employee storage.
- By Roger L. Cauvin
- June 24, 2001
Java To Go!
Empower your EJB clients with mobile actions
Roger L. Cauvin
Listing 1. Interfaces and classes for employee storage.
// Session bean remote interface.
public interface EmployeeStorage extends javax.ejb.EJBObject
{void storeEmployee(Employee employee) throws
RemoteException, StorageException;
Vector retrieveEmployeeSSNs() throws RemoteException,
RetrievalException;
Vector retrieveEmployees() throws RemoteException,
RetrievalException;
Employee retrieveEmployee(String ssn) throws RemoteException,
RetrievalException;
Object performAction(EmployeeStorageAction action) throws
RemoteException, ActionException;
void removeEmployee(String ssn) throws RemoteException,
RemovalException;}
// Action interface visible to session bean and its client.
public interface EmployeeStorageAction
{Object perform(IEmployeeStorage employeeStorage) throws
ActionException;}
// Local interface visible to session bean and its client.
public interface IEmployeeStorage
{void storeEmployee(Employee employee) throws StorageException;
Vector retrieveEmployeeSSNs() throws RetrievalException;
Vector retrieveEmployees() throws RetrievalException;
Employee retrieveEmployee(String ssn) throws RetrievalException;
Object performAction(EmployeeStorageAction action) throws
ActionException;
void removeEmployee(String ssn) throws RemovalException;}
// Session bean class.
public class EmployeeStorageBean implements IEmployeeStorage,
javax.ejb.SessionBean
{ ... code for ejbCreate, storeEmployee, etc. ...
public Object performAction(EmployeeStorageAction action) throws RemoteException, ActionException
{return employeeStorageAction.perform(this);}
}
About the Author
Roger L. Cauvin is a software engineer at KLA-Tencor, Austin, TX. He can be contacted at [email protected].