Quartz源码——JobStore保存JonDetail和Trigger源码分析（一）

我都是分析的jobStore 方式为jdbc的SimpleTrigger！RAM的方式类似分析方式！

{0} ：表的前缀 ，如表qrtz_trigger ,{0}== qrtz_

{1}：quartz.properties 中配置的 org.quartz.scheduler.instanceName: myInstanceName ，{1} ==myInstanceName

要使用定时器，并讲任务持久到数据库，我们一定明白JobDetail和Trigger是如何操作进入数据库，如何注册到Scheduler中！前面我分析了Scheduler的start()和QuartzSchedulerThread的run()！这些都是要在下面讲的这个流程的基础上！

那么下面就开始分析源码，分析源码前首先加一个小的demo，方面解释！

		//1.创建Scheduler的工厂
		SchedulerFactory sf = new StdSchedulerFactory();
		//2.从工厂中获取调度器实例
		Scheduler scheduler = sf.getScheduler();
		//3.创建JobDetail
		JobDetail jb = JobBuilder.newJob(RAMJob.class)
				.withDescription("this is a ram job") //job的描述
				.withIdentity("ramJob", "ramGroup") //job 的name和group
				.build();

		//任务运行的时间，SimpleSchedle类型触发器有效
		long time=  System.currentTimeMillis() + 3*1000L; //3秒后启动任务
		Date statTime = new Date(time);

		//4.创建Trigger
			//使用SimpleScheduleBuilder或者CronScheduleBuilder
		Trigger t = TriggerBuilder.newTrigger()
					.withDescription("")
					.withIdentity("ramTrigger", "ramTriggerGroup")
					//.withSchedule(SimpleScheduleBuilder.simpleSchedule())
					.startAt(statTime)  //默认当前时间启动
					.withSchedule(CronScheduleBuilder.cronSchedule("0/2 * * * * ?")) //两秒执行一次
					.build();

		//5.注册任务和定时器
		scheduler.scheduleJob(jb, t);//源码分析

		//6.启动 调度器
		scheduler.start();

---

真正的源码分析开始了！！！！

主要分析下面这段，从这里进去，看看源码里面到底是怎么进行处理的！

scheduler.scheduleJob(jb, t);//源码分析

/**
     * <p>
     * Calls the equivalent method on the 'proxied' <code>QuartzScheduler</code>.
     * 调用“代理”<QuartzScheduler>上的等效方法。
     *
     * 实现 在 StdScheduler.scheduleJob(JobDetail jobDetail, Trigger trigger)
     * </p>
     */
    public Date scheduleJob(JobDetail jobDetail, Trigger trigger)
        throws SchedulerException {
        //这里的sched 是 QuartzScheduler 对象，Quartz和核心类，Quartz调度器
        return sched.scheduleJob(jobDetail, trigger);//保存JobDetail和Trigger
    }

ched.scheduleJob(jobDetail, trigger);//保存JobDetail和Trigger

/**
     * <p>
     * Add the <code>{@link org.quartz.Job}</code> identified by the given
     * <code>{@link org.quartz.JobDetail}</code> to the Scheduler, and
     * associate the given <code>{@link org.quartz.Trigger}</code> with it.
     * </p>
     *
     * <p>
     * If the given Trigger does not reference any <code>Job</code>, then it
     * will be set to reference the Job passed with it into this method.
     * </p>
     *
     * @throws SchedulerException
     *           if the Job or Trigger cannot be added to the Scheduler, or
     *           there is an internal Scheduler error.
     * 将给定org.quartz.JobDetail标识的org.quartz.Job添加到Scheduler，
     * 并将给定的org.quartz.Trigger与其关联。
     * 如果给定的触发器不引用任何作业，则它将被设置为引用与其一起传递的作业到此方法中。
     *
     * 实现在 QuartzScheduler.scheduleJob(JobDetail jobDetail,
     *       Trigger trigger)
     */
    public Date scheduleJob(JobDetail jobDetail,
            Trigger trigger) throws SchedulerException {
        validateState();//验证调度器是否关闭，关闭抛出异常

		//检查 jobDetail和trigger
        if (jobDetail == null) {
            throw new SchedulerException("JobDetail cannot be null");
        }

        if (trigger == null) {
            throw new SchedulerException("Trigger cannot be null");
        }

        if (jobDetail.getKey() == null) {
            throw new SchedulerException("Job's key cannot be null");
        }

        if (jobDetail.getJobClass() == null) {
            throw new SchedulerException("Job's class cannot be null");
        }

        OperableTrigger trig = (OperableTrigger)trigger;

		//getJobKey 获取 getJobName(), getJobGroup()
        if (trigger.getJobKey() == null) {
            trig.setJobKey(jobDetail.getKey());
        } else if (!trigger.getJobKey().equals(jobDetail.getKey())) {
            throw new SchedulerException(
                "Trigger does not reference given job!");
        }
		//验证trigger
        trig.validate();

        Calendar cal = null;
        if (trigger.getCalendarName() != null) {
            cal = resources.getJobStore().retrieveCalendar(trigger.getCalendarName());//检索Calendar
           "SELECT * FROM {0}CALENDARS WHERE SCHED_NAME = {1} AND CALENDAR_NAME = ?"
        }
        //在触发器首次添加到调度程序时由调度程序调用，以便让触发器基于任何关联的日历计算
        //其第一次触发时间。调用此方法后，getNextFireTime（）应返回有效的答案。
        Date ft = trig.computeFirstFireTime(cal);

        if (ft == null) {
            throw new SchedulerException(
                    "Based on configured schedule, the given trigger '" + trigger.getKey() + "' will never fire.");
        }

		//存储给定的org.quartz.JobDetail和org.quartz.Trigger。
        resources.getJobStore().storeJobAndTrigger(jobDetail, trig);
        notifySchedulerListenersJobAdded(jobDetail);
        notifySchedulerThread(trigger.getNextFireTime().getTime());
        notifySchedulerListenersSchduled(trigger);

        return ft;
    }

//存储给定的org.quartz.JobDetail和org.quartz.Trigger。

resources.getJobStore().storeJobAndTrigger(jobDetail, trig);

public void storeJobAndTrigger(final JobDetail newJob,
            final OperableTrigger newTrigger)
        throws JobPersistenceException {
        executeInLock(
            (isLockOnInsert()) ? LOCK_TRIGGER_ACCESS : null,
            new VoidTransactionCallback() {
                public void executeVoid(Connection conn) throws JobPersistenceException {
	                //（1）保存JobDetail
                    storeJob(conn, newJob, false);
                    //（2）保存Trigger
                    storeTrigger(conn, newTrigger, newJob, false,
                            Constants.STATE_WAITING, false, false);
                }
            });
    }

//（1）保存JobDetail

storeJob(conn, newJob, false);

 protected void storeJob(Connection conn,
            JobDetail newJob, boolean replaceExisting)
        throws JobPersistenceException {

		//判断JobDetail是否已经存在，根据name和group
        boolean existingJob = jobExists(conn, newJob.getKey());
        try {
            if (existingJob) {
                if (!replaceExisting) {
                    throw new ObjectAlreadyExistsException(newJob);
                }
                //更新JobDetail
                getDelegate().updateJobDetail(conn, newJob);
                "UPDATE {0}JOB_DETAILS SET DESCRIPTION = ?, JOB_CLASS_NAME = ?, IS_DURABLE = ?, IS_NONCONCURRENT = ?, IS_UPDATE_DATA = ?, REQUESTS_RECOVERY = ?, JOB_DATA = ?  WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?"
            } else {
	            //插入JobDetail
                getDelegate().insertJobDetail(conn, newJob);
                "INSERT INTO {0}JOB_DETAILS (SCHED_NAME, JOB_NAME, JOB_GROUP, DESCRIPTION, JOB_CLASS_NAME, IS_DURABLE, IS_NONCONCURRENT, IS_UPDATE_DATA, REQUESTS_RECOVERY, JOB_DATA)  VALUES({1}, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
            }
        } catch (IOException e) {
            throw new JobPersistenceException("Couldn't store job: "
                    + e.getMessage(), e);
        } catch (SQLException e) {
            throw new JobPersistenceException("Couldn't store job: "
                    + e.getMessage(), e);
        }
    }

---

//（2）保存Trigger

storeTrigger(conn, newTrigger, newJob, false,

Constants.STATE_WAITING, false, false);

protected void storeTrigger(Connection conn,
            OperableTrigger newTrigger, JobDetail job, boolean replaceExisting, String state,
            boolean forceState, boolean recovering)
        throws JobPersistenceException {

		//判断Trigger是否已经存在，根据name和group
        boolean existingTrigger = triggerExists(conn, newTrigger.getKey());

        if ((existingTrigger) && (!replaceExisting)) {
            throw new ObjectAlreadyExistsException(newTrigger);
        }

        try {

            boolean shouldBepaused;
			//进行一些状态的判断
            if (!forceState) {
                shouldBepaused = getDelegate().isTriggerGroupPaused(
                        conn, newTrigger.getKey().getGroup());

                if(!shouldBepaused) {
                    shouldBepaused = getDelegate().isTriggerGroupPaused(conn,
                            ALL_GROUPS_PAUSED);

                    if (shouldBepaused) {
                        getDelegate().insertPausedTriggerGroup(conn, newTrigger.getKey().getGroup());
                    }
                }

                if (shouldBepaused && (state.equals(STATE_WAITING) || state.equals(STATE_ACQUIRED))) {
                    state = STATE_PAUSED;
                }
            }
			//若job为null，重新获取！
            if(job == null) {
                job = getDelegate().selectJobDetail(conn, newTrigger.getJobKey(), getClassLoadHelper());

				"SELECT * FROM {0}JOB_DETAILS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?"
            }
            if (job == null) {
                throw new JobPersistenceException("The job ("
                        + newTrigger.getJobKey()
                        + ") referenced by the trigger does not exist.");
            }
			//判断是否有DisallowConcurrentExecution注解，recovering恢复
            if (job.isConcurrentExectionDisallowed() && !recovering) {
                state = checkBlockedState(conn, job.getKey(), state);
			"if (jobName != null) {
                ps = conn.prepareStatement(rtp(SELECT_FIRED_TRIGGERS_OF_JOB));
		                "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND JOB_NAME = ? AND JOB_GROUP = ?"
                ps.setString(1, jobName);
                ps.setString(2, groupName);
            } else {
                ps = conn
                        .prepareStatement(rtp(SELECT_FIRED_TRIGGERS_OF_JOB_GROUP));
                        "SELECT * FROM {0}FIRED_TRIGGERS WHERE SCHED_NAME = {1} AND JOB_GROUP = ?"
                ps.setString(1, groupName);
            }"
            }

            if (existingTrigger) {
	            //更新trigger
                getDelegate().updateTrigger(conn, newTrigger, state, job);
  "  大概贴出一些，具体想看完整的进入源码看
	  if(updateJobData) {
	      ps = conn.prepareStatement(rtp(UPDATE_TRIGGER));
	      "UPDATE {0}TRIGGERS SET JOB_NAME = ?, JOB_GROUP = ?, DESCRIPTION = ?, NEXT_FIRE_TIME = ?, PREV_FIRE_TIME = ?, TRIGGER_STATE = ?, TRIGGER_TYPE = ?, START_TIME = ?, END_TIME = ?, CALENDAR_NAME = ?, MISFIRE_INSTR = ?, PRIORITY = ?, JOB_DATA = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?"
       } else {
           ps = conn.prepareStatement(rtp(UPDATE_TRIGGER_SKIP_DATA));
           "UPDATE {0}TRIGGERS SET JOB_NAME = ?, JOB_GROUP = ?, DESCRIPTION = ?, NEXT_FIRE_TIME = ?, PREV_FIRE_TIME = ?, TRIGGER_STATE = ?, TRIGGER_TYPE = ?, START_TIME = ?, END_TIME = ?, CALENDAR_NAME = ?, MISFIRE_INSTR = ?, PRIORITY = ? WHERE SCHED_NAME = {1} AND TRIGGER_NAME = ? AND TRIGGER_GROUP = ?"
       }
"
            } else {
				//插入trigger
                getDelegate().insertTrigger(conn, newTrigger, state, job);
                "INSERT INTO {0}TRIGGERS (SCHED_NAME, TRIGGER_NAME, TRIGGER_GROUP, JOB_NAME, JOB_GROUP, DESCRIPTION, NEXT_FIRE_TIME, PREV_FIRE_TIME, TRIGGER_STATE, TRIGGER_TYPE, START_TIME, END_TIME, CALENDAR_NAME, MISFIRE_INSTR, JOB_DATA, PRIORITY)  VALUES({1}, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)"
            }
        } catch (Exception e) {
            throw new JobPersistenceException("Couldn't store trigger '" + newTrigger.getKey() + "' for '"
                    + newTrigger.getJobKey() + "' job:" + e.getMessage(), e);
        }
    }

到这里，保存就结束了!

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