/**
 * <p>Title: SendMTList</p>
 * <p>Description: </p>
 * 存于waitinfo、ui_waitinfo的消息隊列
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: Hoten</p>
 * @version 1.0
 */
package com.hoten.tail;

import java.util.Vector;

public class TailList {
        /** SaveMT消息模塊實例 */
        static private TailList _instance;
        /** SaveMT消息隊列 */
        private Vector _vList;
        /** 線程同步控制確保模塊僅有一個實例 */
        static synchronized public TailList getInstance() {
                if (_instance == null) {
                        _instance = new TailList();
                }
                return _instance;
        }
        /** 構造器，默認消息隊列長度為50 */
        private TailList() {
                _vList=new Vector(50);
        }
        /** 向消息隊列添加消息 */
        public synchronized void add(TailInfo msg){
                _vList.addElement(msg);
        }
        /** 向消息隊列插入消息(添加到隊列起始處) */
        public synchronized void insert(TailInfo msg){
                _vList.add(0,msg);
        }
        /** 返回并刪除消息隊列起始處消息，若消息隊列為空，返回空 */
        public synchronized TailInfo remove() {
          if (_vList.size() == 0)     return null;
            return (TailInfo) _vList.remove(0);
        }
        /** 返回消息隊列長度 */
        public int getSize(){
                return _vList.size();
        }
}