TimerStep.java

/**
 * The MIT License (MIT)
 * Copyright (c) 2012-2014 唐虞科技(TangyuSoft) Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.tangyu.component.util;

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

/**
 * @author bin
 */
public class TimerStep {

    private Timer mTimer;
    private int mCurrentCount;

    private synchronized void add() {
        ++mCurrentCount;
    }

    private synchronized void remove() {
        --mCurrentCount;
    }

    public synchronized void startTimer(long delay, final ITimerListener lis) {
        if (mTimer == null) {
            mTimer = new Timer();
        }
        mTimer.schedule(new TimerTask() {

            @Override
            public void run() {
                remove();
                if (lis != null) {
                    lis.timesUp();
                    if (mCurrentCount <= 0) {
                        lis.over();
                    }
                }
            }
        }, delay);

        add();
    }

    public synchronized void cancel() {
        if (mTimer != null && mCurrentCount > 0) {
            mTimer.cancel();
            mTimer = null;
        }
    }

    public interface ITimerListener {
        void timesUp();

        void over();
    }

}