com.voa.weixin.mission.MissionManager.java Source code

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Here is the source code for com.voa.weixin.mission.MissionManager.java

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/**
 This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
    
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
    
You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.voa.weixin.mission;

import java.lang.reflect.Constructor;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Timer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Document;
import org.dom4j.Element;

import com.voa.weixin.utils.WeixinUtils;

/**
 * ?
 * @author zhaiyuxin
 *
 */
public class MissionManager {

    private final Log logger = LogFactory.getLog(MissionManager.class);

    /** ?? **/
    private final Timer timer;
    private final Map<String, Mission> missions;
    private static MissionManager manager;

    private MissionManager() {
        timer = new Timer();
        missions = new HashMap<String, Mission>();

        init();
    }

    private void init() {
        Document doc = null;
        try {
            doc = WeixinUtils.getDocumentResource("weixin.mission.xml");

        } catch (Exception e) {
            logger.warn("can't find or parser weixin.mission.xml:" + e.getMessage());
        }
        if (doc == null)
            return;

        List<Element> missionEs = doc.getRootElement().elements("mission");

        for (Element missionE : missionEs) {
            String name = missionE.elementText("name");
            String period = missionE.elementText("period");
            String delay = missionE.elementText("delay");
            String className = missionE.elementText("class");

            try {
                Class clz = Class.forName(className);
                Constructor<Mission> constructor = clz.getConstructor(String.class);

                Mission mission = constructor.newInstance(name);

                mission.setDelay((Integer.valueOf(delay) * 1000));
                mission.setPeriod((Integer.valueOf(period) * 1000));

                missions.put(name, mission);

                timer.schedule(mission, mission.getDelay(), mission.getPeriod());
            } catch (Exception e) {
                logger.warn("mission can't be instance : " + name);
                logger.warn("cause by " + e.getMessage());
            }
        }

    }

    public static MissionManager getInstance() {
        if (manager == null)
            manager = new MissionManager();

        return manager;
    }

    public Timer getTimer() {
        return timer;
    }

    public void addMission(Mission mission) {
        missions.put(mission.getName(), mission);
        timer.schedule(mission, mission.getDelay(), mission.getPeriod());
    }

    public Mission getMission(String name) {
        return missions.get(name);
    }

    public void destroy() {
        timer.cancel();
    }
}