package com.walker.infrastructure.scheduler;

import com.walker.infrastructure.core.NestedRuntimeException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 抽象定时任务定义基类，子类实现具体执行任务，同时可以设置间隔时间和延时时间
 * @author MikeShi
 *
 */
public abstract class AbstractTimedTask implements TimedTask {

	protected transient Logger logger = LoggerFactory.getLogger(this.getClass());
	
	//最小间隔时间，默认5秒
	private static final long TIMED_MIN_PERIOD = 5000;
	
	//最小延时时间，即系统启动后多长时间后开始运行任务，默认30秒钟
	private static final long TIMED_MIN_DELAY = 30000;
	
	private static final int MAX_ERROR_COUNT = 10;
	
	private int errorCount = 0;
	
	private long delay = 5000;
	private long period = 0;
	
	public long getDelay() {
		// TODO Auto-generated method stub
		if(delay == 0){
			delay = TIMED_MIN_DELAY;
		}
		return delay;
	}

	public long getPeriod() {
		// TODO Auto-generated method stub
		if(period < 0){
			throw new NullPointerException("period must be set in TimedTask! It is more than 0.");
		} else if(period > 0 && period < TIMED_MIN_PERIOD){
			throw new NestedRuntimeException("period must more than" + TIMED_MIN_PERIOD/1000 + " seconds in TimedTask!");
		}
		return period;
	}

	public void setDelay(long delays) {
		// TODO Auto-generated method stub
		if(delays < TIMED_MIN_DELAY){
			this.delay = TIMED_MIN_DELAY;
		} else
			this.delay = delays;
	}

	public void setPeriod(long periods) {
		// TODO Auto-generated method stub
		if(periods > 0 && periods < TIMED_MIN_PERIOD){
			this.period = TIMED_MIN_PERIOD;
		} else
			this.period = periods;
	}

	public void run() {
		// TODO Auto-generated method stub
		if(period == 0){
			logger.debug("任务执行忽略，设置间隔为0");
			return;
		}
		
		if(errorCount > MAX_ERROR_COUNT){
			//执行通知事件：告知管理员系统定时任务错误执行了最大值
			//eventPublisher.notify();
			logger.debug("//*************定时任务执行错误，已超出错误最大值!");
		}
		
		try {
			execute();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			logger.warn("execute error in TimedTask: " + this.getClass().getName());
			logger.error(e.getMessage());
			errorCount++;
		}
	}

	public abstract void execute() throws Exception;
}