java timer by day

TimerManager.java

package com.dhlz.webService.util;

import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.*;

/**
 * User: seveniu
 * Date: 11/12/14
 * Time: 5:46 PM
 * Project: FireGetAll
 */
public class TimerManager {

    private ConcurrentHashMap<String, ScheduledExecutorService> timerMap = new ConcurrentHashMap<>();
    private static TimerManager instance = new TimerManager();

    private TimerManager() {
    }

    public static TimerManager get() {
        return instance;
    }

    /**
     * @param name      任务名
     * @param timerTask 任务
     * @param hour      小时
     */
    public void addDayTimerTask(final String name, final Runnable timerTask, int hour) {
        addTimerTask(name, timerTask, getFirstDelay(getFirstRunTime(hour, 0, 0)), 1, TimeUnit.DAYS);
    }

    /**
     * @param name      任务名
     * @param timerTask 任务
     * @param hour      小时
     * @param minute    分钟
     */
    public void addDayTimerTask(final String name, final Runnable timerTask, int hour, int minute) {
        addTimerTask(name, timerTask, getFirstDelay(getFirstRunTime(hour, minute, 0)), 1, TimeUnit.DAYS);
    }

    /**
     * @param name      任务名
     * @param timerTask 任务
     * @param hour      小时
     * @param minute    分钟
     * @param second    秒
     */
    public void addDayTimerTask(final String name, final Runnable timerTask, int hour, int minute, int second) {
        addTimerTask(name, timerTask, getFirstDelay(getFirstRunTime(hour, minute, second)), 1, TimeUnit.DAYS);
    }

    /**
     * @param name      任务名
     * @param timerTask 任务
     * @param hour      小时
     * @param minute    分钟
     * @param second    秒
     */
    public void addTimerTask(final String name, final Runnable timerTask, int hour, int minute, int second, long period, TimeUnit timeUnit) {
        long firstDelay = getFirstDelay(getFirstRunTime(hour, minute, second));
        System.out.println("firstDelay : " + firstDelay);
        addTimerTask(name, timerTask, firstDelay, period, timeUnit);
    }

    /**
     * 添加周期任务
     *
     * @param name      任务名
     * @param timerTask 任务
     * @param period    周期
     * @param timeUnit  周期的单位
     */
    public void addTimerTask(final String name, final Runnable timerTask, long firstDelay, long period, TimeUnit timeUnit) {
        if (timerTask == null) {
            throw new NullPointerException("timerTask is null");
        }
        ScheduledExecutorService scheduled = Executors.newSingleThreadScheduledExecutor(new ThreadFactory() {
            @Override
            public Thread newThread(Runnable r) {
                Thread thread = new Thread(r);
                thread.setName(name);
                return thread;
            }
        });
        scheduled.scheduleWithFixedDelay(timerTask,
                firstDelay,
                period,
                timeUnit);

        timerMap.put(name, scheduled);
    }

    /**
     * 获取第一次执行的时间
     *
     * @param hour   小时
     * @param minute 分钟
     * @param second 秒
     * @return 第一次执行的时间
     */
    public Date getFirstRunTime(int hour, int minute, int second) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR_OF_DAY, hour);
        calendar.set(Calendar.MINUTE, minute);
        calendar.set(Calendar.SECOND, second);
        Date date = calendar.getTime();

        if (date.before(new Date())) {
            calendar.add(Calendar.DAY_OF_YEAR, 1);
            date = calendar.getTime();
        }
        return date;
    }

    private long getFirstDelay(Date date) {

        return (date.getTime() - System.currentTimeMillis()) / 1000;
    }

    public void stopTimer(String name) {
        timerMap.get(name).shutdown();
    }


    public static void main(String[] args) {
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                System.out.println(new Date());
            }
        };

//        TimerManager.get().addTimerTask("test", runnable, 10, 2, TimeUnit.SECONDS);

//        TimerManager.get().addTimerTask("test", runnable, 19, 26, 0, 4, TimeUnit.SECONDS);
    }
}