package com.dy.aceMw.server.tasks;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.dy.common.queue.Node;
import com.dy.common.mw.core.CoreTask;
import com.dy.aceMw.server.forTcp.TcpDownCommandCach;
import com.dy.aceMw.server.forTcp.TcpDownCommandObj;
import com.dy.aceMw.server.forTcp.TcpSessionCach;

/**
 * 处理RTU下行命令数据的恒久任务
 */
public class ToRtuConstantTask extends CoreTask {
	
	private static Logger log = LogManager.getLogger(ToRtuConstantTask.class.getName());

	/**
	 * 在单线程环境中运行
	 */
	@Override
	public Integer excute() {
		try{
			Long now = System.currentTimeMillis() ;
			dealTcpSession(now) ;
			return dealDownCommand(now) ;
		}catch(Exception e){
			log.error(e);
		}
		return null ;
	}
	/**
	 * 处理TCP缓存中的各个TCP Session的上行数据时刻
	 */
	private void dealTcpSession(Long now){
		TcpSessionCach.updateUpDataTime(now) ;
	}
	
	/**
	 * 处理下行命令
	 */
	public Integer dealDownCommand(Long now) {
		try{
			Node first = TcpDownCommandCach.getFirstQueueNode() ;
			if(first != null){
				Integer count = TcpDownCommandCach.size() ;
				Node last = TcpDownCommandCach.getLastQueueNode() ;
				this.doDealDownCommand(now, first, last);
				return count ;
			}
		}catch(Exception e){
			log.error(e);
		}
		return null ;
	}
	/**
	 * 处理缓存的下行命令节点
	 * @param now
	 * @param first
	 * @param last
	 */
	private void doDealDownCommand(Long now, Node first, Node last){
		if(first != null){
			//在dealNode方法中，可能要把first从队列中移除，这时first.next为空，所以提前把first.next取出来
			Node next = first.next ;
			dealNode(now, first) ;
			if(last != null && first != last){
				doDealDownCommand(now, next, last) ;
			}else if(last != null && first == last){
				//停止
			}else if(last == null){
				//这种情况不会存在
				doDealDownCommand(now, next, last) ;
			}
		}
	}
	
	/**
	 * 处理一个节点
	 * @param now
	 * @param node
	 */
	private void dealNode(Long now, Node node){
		TcpDownCommandObj obj = (TcpDownCommandObj)node.obj ;
		boolean removeNode = obj.dealSelf(now) ;
		if(removeNode){
			TcpDownCommandCach.removeNode(node);
		}
	}


}