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package ars.util;

import java.util.Timer;
import java.util.TimerTask;

/**
 * 系统后台定时任务服务抽象类
 *
 * @author wuyongqiang
 */
public abstract class AbstractTimerServer extends AbstractServer {
    private Timer timer; // 定时器
    private int interval = 3; // 执行周期（秒）

    public int getInterval() {
        return interval;
    }

    public void setInterval(int interval) {
        if (interval < 1) {
            throw new IllegalArgumentException("Interval must not be less than 1, got " + interval);
        }
        this.interval = interval;
    }

    /**
     * 执行服务
     *
     * @throws Exception 操作异常
     */
    protected abstract void execute() throws Exception;

    @Override
    public void run() {
        this.timer = new Timer(true);
        this.timer.schedule(new TimerTask() {

            @Override
            public void run() {
                try {
                    execute();
                } catch (Exception e) {
                    logger.error("Timer execute failed", e);
                }
            }

        }, 0, this.interval * 1000);
        try {
            Thread.currentThread().join();
        } catch (InterruptedException e) {
        }
    }

    @Override
    public void stop() {
        if (this.timer != null) {
            synchronized (this) {
                if (this.timer != null) {
                    this.timer.cancel();
                    this.timer = null;
                }
            }
        }
        super.stop();
    }

}