quartz集群 定时任务 改成可配置

前面的博文中提到的quartz集群方式会有以下缺点：

1.假设配置了3个定时任务，job1，job2，job3，这时数据库里会有3条job相关的记录，如果下次上线要停掉一个定时任务job1，那即使定时任务配置文件 quartz.xml 中的trigger 去掉了，数据库还是会有该条记录，若代码没有去掉，那定时任务还是会执行。

------解决方法1：修改该trigger的触发时间，比如年改成2099，让它不触发，（SchedulerFactoryBean中配置了  <property name="overwriteExistingJobs" value="true" />），会覆盖数据库中的相关记录。

缺点：曲线救国策略，不够好。

------解决方法2：删除数据库中该job的相关记录。

缺点：要操作数据库，而且表中数据还有外键约束，操作起来麻烦，还可能不小心破坏了其他job信息。

解决方法3：

介绍一种用配置文件的方式，通过开关控制，达到更细粒度的控制。主要是通过Scheduler的相关方法：Trigger和JobDetail可以注册到Scheduler中，两者在Scheduler中拥有各自的组及名称，组及名称是Scheduler查找定位容器中某一对象的依据。Scheduler定义了多个接口方法，允许外部通过组及名称访问和控制容器中Trigger和JobDetail。Scheduler包含了很多方法，添加、执行一次、恢复全部、删掉任务暂停全部等方法，方便用户灵活使用。

1.创建定时任务的配置文件 quartz-config.properties

#定时任务配置文件
#key:
# CronTriggerFactoryBean配置的id
# switch:定时任务开关，ON:开启该定时任务； OFF:关闭该定时任务
# cron:该定时任务的执行时间间隔(cron表达式)

#定时任务(每隔15分钟执行)
intrBillTrigger.switch=OFF
intrBillTrigger.cron=0 0/15 * * * ?

2.applicationContext-quartz.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="intrBillJob"
          class="org.springframework.scheduling.quartz.JobDetailFactoryBean">
          <property name="jobClass" value="com.cmcc.open.task.utils.MyDetailQuartzJobBean"></property> //参考以前的那篇博文
            <property name="Durability" value="true"/>
                <property name="jobDataAsMap">
            <map>
                <entry key="targetObject" value="billTimerIntrTask" />
                <entry key="targetMethod" value="intrBillTimer" />
            </map>
         </property>
    </bean>
    <bean id="intrBillTrigger" class="org.springframework.scheduling.quartz.CronTriggerFactoryBean">
        <property name="jobDetail" ref="intrBillJob"></property>
        <!--<property name="cronExpression" value="0 0/15 * * * ?"></property>-->
        <property name="cronExpression" value="${intrBillTrigger.cron}"></property>
    </bean>

<bean id="scheduler" class="org.springframework.scheduling.quartz.SchedulerFactoryBean">
    <property name="dataSource" ref="dataSourceQuartz"></property>
    <property name="jobFactory" ref="customJobFactory"></property>
    <property name="applicationContextSchedulerContextKey"  value="applicationContext"></property>
    <property name="configLocation" value="classpath:quartz.properties" />  //参考以前那篇博文
    <property name="overwriteExistingJobs" value="true" />
    <property name="triggers">
            <list>
                <ref bean="intrBillTrigger"/>
            </list>
        </property>
    </bean>
</beans>

3.QuartzScheduleConfigTask 定时任务控制类

package com.cmcc.open.task.service;

import com.cmcc.open.framework.utils.EncryptPropertyPlaceholderConfigurer;

import org.quartz.CronScheduleBuilder;
import org.quartz.CronTrigger;
import org.quartz.JobKey;
import org.quartz.Scheduler;
import org.quartz.Trigger;
import org.quartz.TriggerBuilder;
import org.quartz.TriggerKey;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import org.springframework.scheduling.quartz.SchedulerFactoryBean;
import org.springframework.stereotype.Component;

import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

/**
 * QuartzScheduleConfigTask.
 * 初始化定时任务配置
 */
@Component
public class QuartzScheduleConfigTask {
    /** The Constant log. */
    private static Logger logger = LoggerFactory.getLogger(QuartzScheduleConfigTask.class);
    private static Properties properties;

    @Autowired
    private SchedulerFactoryBean schedulerFactoryBean;

    /**
     * 初始化定时任务配置
     */
    public void initQuartzConfig() {
        String triggerName = null;
            //读取定时任务配置文件（包括开关、执行时间）
        Properties properties = getProperty();
        if (properties == null) {
            logger.warn(".......cannot find quartz-config properties file");
        }

        try {
            //解析定时任务配置文件，进行修改
            Set<Map.Entry<Object, Object>> entrySet = properties.entrySet();
            Scheduler sched = schedulerFactoryBean.getScheduler();
            //先对读取到的配置进行过滤，将开关和cron放到同一个key中
            Iterator it1 = entrySet.iterator();
            while (it1.hasNext()) {
                Map.Entry<Object, Object> entry = (Map.Entry<Object, Object>)
                    it1.next();
                String key = String.valueOf(entry.getKey());
                if (!key.endsWith("switch")) {
                    continue;
                }
                triggerName = key.substring(0, key.lastIndexOf("."));
                if ("OFF".equalsIgnoreCase(String.valueOf(entry.getValue()))) {
                    //关闭该定时任务
                    closeQuartz(sched, triggerName);
                } else {
                    //获取该定时任务的执行时间，与配置文件进行比较
                    //目前定时任务的实现时间从配置文件中读取，不需要再进行修改
                    String cron = null;
                    Iterator it2 = entrySet.iterator();
                    while (it2.hasNext()) {
                        Map.Entry<Object, Object> entryChild = (Map.Entry<Object, Object>) it2.next();
                        if(!String.valueOf(entryChild.getKey()).startsWith(triggerName)
                            || !String.valueOf(entryChild.getKey()).endsWith("cron")) {
                            continue;
                        }
                        cron = String.valueOf(entryChild.getValue());
                        it1.remove();
                        break;
                    }
                    updateQuartz(sched, triggerName, cron);
                }
            }
        } catch (Exception e) {
            logger.warn("Exception in trigger:" + triggerName);
            logger.warn("Exception in initQuartzConfig:" + e.getMessage(), e);
        }

    }

    /**
     * 删除定时任务
     * @param sched
     * @param triggerName
     * @throws Exception
     */
    private void closeQuartz(Scheduler sched, String triggerName) throws Exception {
        TriggerKey triggerKey = TriggerKey.triggerKey(triggerName, Scheduler.DEFAULT_GROUP);
        CronTrigger trigger = (CronTrigger) sched.getTrigger(triggerKey);
        if (trigger == null) {
            logger.warn("no trigger get for key:" + triggerName + " do nothing for this trigger");
            return;
        }

        //如果定时任务关闭，则从数据库中移除
        //停止触发器
        sched.pauseTrigger(triggerKey);
        //移除触发器
        sched.unscheduleJob(triggerKey);
        //删除任务
        String jobName = trigger.getJobKey().getName();
        sched.deleteJob(JobKey.jobKey(jobName, Scheduler.DEFAULT_GROUP));
        logger.info("delete quartz job:" + jobName + " succ.........");
    }

    /**
     * 更新定时任务执行时间
     * @param sched
     * @param triggerName
     * @param cron
     * @throws Exception
     */
    private void updateQuartz(Scheduler sched, String triggerName, String cron) throws Exception {
        TriggerKey triggerKey = TriggerKey.triggerKey(triggerName, Scheduler.DEFAULT_GROUP);
        CronTrigger trigger = (CronTrigger) sched.getTrigger(triggerKey);

        //如果定时任务开启，从数据库读取该job的执行时间进行比较
        //如果相关不做任何处理，如果不等则更新数据库中的执行时间
        String oldTime = trigger.getCronExpression();
        if (!oldTime.equals(cron)) {
            logger.info("quartz job's oldTime not equals config cron, trigger name is : " + triggerName
                + "|oldTime is : " + oldTime
                + "|config cron is : " + cron);
            //触发器
            TriggerBuilder<Trigger> triggerBuilder = TriggerBuilder.newTrigger();
            //触发其名，触发器组
            triggerBuilder.withIdentity(triggerName, Scheduler.DEFAULT_GROUP);
            triggerBuilder.startNow();
            //触发器时间设定
            triggerBuilder.withSchedule(CronScheduleBuilder.cronSchedule(cron));
            //创建Trigger对象
            trigger = (CronTrigger) triggerBuilder.build();
            //修改一个任务的触发时间
            sched.rescheduleJob(triggerKey, trigger);
            logger.info("update quartz job:" + trigger.getJobKey().getName() + " succ.........");
        } else {
            logger.info("the quartz job's config cron is equals old cron, do nothing for this quartz: " + triggerName);
        }
    }

    /**
     * 读取配置文件
     * @return
     */
    private Properties getProperty() {
        try {

            // 先获取jvm传参
            String pathRoot = "D:\\Test\\";
            String path = pathRoot + "quartz-config.properties";
            if ("".equals(pathRoot)){
                path = QuartzScheduleConfigTask.class.getClassLoader().getResource("quartz-config.properties").getPath();
            }
            Resource resource = new FileSystemResource(path);
            properties = PropertiesLoaderUtils.loadProperties(resource);
            Set<Map.Entry<Object, Object>> entrySet = properties.entrySet();
            for (Map.Entry<Object, Object> entry : entrySet) {
                String decryptValue = EncryptPropertyPlaceholderConfigurer
                    .getDecryptPara(entry.getKey().toString(), entry.getValue().toString());
                properties.setProperty(entry.getKey().toString(), decryptValue);
            }

            return properties;
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        }

        return null;
    }
}