关于定时器扫描数据库，根据数据库的值去想webservice定时发送，求高手给个思路

我觉得还是用伪代码表示比较方便：

1. scan thread: List<String> col_a_list = get col_a record from db 
scan thread: stop; 
for (String col_a: col_a_list) { 
   int time = getTime(col_a);//get time based on col_a 
   startTimer(time, new WebServiceThread()); 
   update db record of col_a to tell make it not eligible for the    scan thread. 
} 

2. WebServiceThread: 

If success { 
  update db record of col_a to tell make it not eligible for the    scan thread. 
} else if (col_a == 4) { 
  update db record of col_a to tell make it not eligible for the    scan thread. 
} else { 
  update col_a = col_a + 1; 
}