loaddataservletctxlsnr.java

Oracle的J2EE Sample

 /*
 * @author  : Elangovan
 * @version : 1.0
 *
 * Development Environment : Oracle9i JDeveloper
 * Name of the File        : LoadDataServletCtxLsnr.java
 *
 * Creation / Modification History
 *    Elangovan           28-Aug-2003        Created
 *
 */
package oracle.otnsamples.ibfbs.admin.helper;

import javax.naming.InitialContext;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import oracle.otnsamples.ibfbs.utils.ConnectionParams;
import oracle.otnsamples.ibfbs.usermanagement.ejb.UserManagementSessionRemote;
import oracle.otnsamples.ibfbs.usermanagement.ejb.UserManagementSessionHomeRemote;

/**
 * This class is invoked by the container when the servlet context of this web 
 * application is initialized. Checks if the sample data has been loaded, else 
 * loads them. This listener class is specified in the Web application deployment 
 * descriptor (web.xml), when the container parses web.xml it registers this listener.
 * 
 * @see DataPopulator.java
 * @see SampleData.java
 */
public class LoadDataServletCtxLsnr 
  implements ServletContextListener {
  
  /**
   * Initializes a new instance of LoadDataServletCtxListener.
   */
  public LoadDataServletCtxLsnr() { }

  /**
   * This method is invoked by the container when the servletcontext is initialized.
   * 
   * @param sce ServletContext event details
   */
  public void contextInitialized(ServletContextEvent sce) {
  
    System.out.println("Debug: ServletContext initialized ");
    
    // Create tables, sequences and load sample data ( if they donot exist )
    DataPopulator loader = new DataPopulator();
    try {
      loader.populateSampleData();
    }catch(Exception ex) {
      System.err.println("Fatal Error loading sample data :"+ex.toString());
    }
    
    // Create admin account
    this.populateAdminUser();
  }

  /**
   * This method is called by container when servlet context is destroyed.
   * 
   * @param sce ServletContext event details
   */
  public void contextDestroyed(ServletContextEvent sce) { }
  
  /**
   * This method checks if Admin user account has been created. Creates a new
   * account if Admin user does not exist.
   *
   */
  private void populateAdminUser() {     
    // Reference to rmote interface of Usermanagement session bean
    UserManagementSessionRemote  rmr = null;
    Integer accountNumber = null;

    try {
 
      InitialContext ctx = new InitialContext();

      // Bind 'NTFY_MAIL' with the notification mail id
      // This name will be used by other Session EJB's for sending notification
      // mails
      ctx.rebind("NTFY_MAIL", ConnectionParams.notificationMailId);

      // Initialize the Home Interface for 'UserManagementSessionFacadeBean'
      UserManagementSessionHomeRemote rmrh = (UserManagementSessionHomeRemote)
                 ctx.lookup("java:comp/env/ejb/UserManagementSessionHomeRemote");

      // Initialize Remote Interface
      rmr = rmrh.create();

      synchronized(rmr) {

        // Create Admin account
        accountNumber = rmr.createAdminAccount();

      }

      if(accountNumber.intValue() != 0)
        System.out.println(" Admin user created with Account Number : "
                           +accountNumber+ " and password : welcome ");

    } catch (Exception ex) { 
      System.err.println("Error creating admin account :"+ex.toString());
    }
  }
  
}