Java编程

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Java

RoomManager.java：源码内容

							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);
    }
  }
}

						