roommanager.java

来自「100多M的J2EE培训内容」· Java 代码 · 共 81 行

package com.borland.training.meetings.sessions;

import javax.ejb.*;
import javax.naming.*;
import java.util.*;
import com.borland.training.meetings.entities.*;

class RoomManager {

  private static RoomManager instance = null;
  private EJBHomeFactory homeFactory;
  private RoomValueFactory roomValueFactory;

  private RoomManager() throws NamingException {
    homeFactory = EJBHomeFactory.getInstance();
    roomValueFactory = RoomValueFactory.getInstance();
  }

  public static RoomManager getInstance() throws NamingException {
    if(instance == null) {
      instance = new RoomManager();
    }
    return instance;
  }

  public String createRoom(RoomValue roomValue)
    throws FinderException, NamingException {

    try {
      RoomHome roomHome =
        (RoomHome) homeFactory.lookupByLocalEJBReference("Room");
      Room room = roomHome.create(roomValue.getName(),
        roomValue.getCapacity());
      return room.getName();
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }

  public void updateRoom(RoomValue roomValue)
    throws FinderException, NamingException {

    try {
      Room room = roomValueFactory.findRoom(roomValue.getName());
      room.setCapacity(roomValue.getCapacity());
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }

  public void removeRoom(String name)
    throws FinderException, NamingException {

    try {
      Room room = roomValueFactory.findRoom(name);
      room.remove();
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }

  public void removeAllRooms()
    throws FinderException, NamingException {

    try {
      Collection rooms = roomValueFactory.findAllRooms();
      Iterator iterator = rooms.iterator();
      Room room = null;
      while(iterator.hasNext()) {
        room = (Room) iterator.next();
        room.remove();
      }
    }
    catch(Exception e) {
      throw new EJBException(e);
    }
  }
}