调度组件优化：针对永远不会触发的Cron禁止配置和启动；任务Cron最后一次触发后再也不会触发时，比如一次性任务，主动停止相关任务；

doc/XXL-JOB官方文档.md

 - 8、[ING]任务、执行器数据全量本地缓存；新增消息表广播通知；
 - 9、[ING]任务触发组件优化，常规1s预加载一次，轮空时主动休眠4s；
 - 10、注册监控线程优化，降低死锁几率；
+- 11、调度组件优化：针对永远不会触发的Cron禁止配置和启动；任务Cron最后一次触发后再也不会触发时，比如一次性任务，主动停止相关任务；
 
 
 ### TODO LIST

xxl-job-admin/src/main/java/com/xxl/job/admin/core/thread/JobScheduleHelper.java

                                     // 过期超5s：本地忽略，当前时间开始计算下次触发时间
 
                                     // fresh next
-                                    jobInfo.setTriggerLastTime(jobInfo.getTriggerNextTime());
-                                    jobInfo.setTriggerNextTime(
-                                            new CronExpression(jobInfo.getJobCron())
-                                                    .getNextValidTimeAfter(new Date())
-                                                    .getTime()
-                                    );
+                                    Date nextValidTime = new CronExpression(jobInfo.getJobCron()).getNextValidTimeAfter(new Date());
+                                    if (nextValidTime != null) {
+                                        jobInfo.setTriggerLastTime(jobInfo.getTriggerNextTime());
+                                        jobInfo.setTriggerNextTime(nextValidTime.getTime());
+                                    } else {
+                                        jobInfo.setTriggerStatus(0);
+                                        jobInfo.setTriggerLastTime(0);
+                                        jobInfo.setTriggerNextTime(0);
+                                    }
 
                                 } else if (nowTime > jobInfo.getTriggerNextTime()) {
                                     // 过期5s内 ：立即触发一次，当前时间开始计算下次触发时间；
                                         pushTimeRing(ringSecond, jobInfo.getId());
 
                                         // 3、fresh next
-                                        jobInfo.setTriggerLastTime(jobInfo.getTriggerNextTime());
-                                        jobInfo.setTriggerNextTime(
-                                                new CronExpression(jobInfo.getJobCron())
-                                                        .getNextValidTimeAfter(new Date(jobInfo.getTriggerNextTime()))
-                                                        .getTime()
-                                        );
+                                        Date nextValidTime = new CronExpression(jobInfo.getJobCron()).getNextValidTimeAfter(new Date(jobInfo.getTriggerNextTime()));
+                                        if (nextValidTime != null) {
+                                            jobInfo.setTriggerLastTime(jobInfo.getTriggerNextTime());
+                                            jobInfo.setTriggerNextTime(nextValidTime.getTime());
+                                        } else {
+                                            jobInfo.setTriggerStatus(0);
+                                            jobInfo.setTriggerLastTime(0);
+                                            jobInfo.setTriggerNextTime(0);
+                                        }
 
                                     }
 
                                     pushTimeRing(ringSecond, jobInfo.getId());
 
                                     // 3、fresh next
-                                    jobInfo.setTriggerLastTime(jobInfo.getTriggerNextTime());
-                                    jobInfo.setTriggerNextTime(
-                                            new CronExpression(jobInfo.getJobCron())
-                                                    .getNextValidTimeAfter(new Date(jobInfo.getTriggerNextTime()))
-                                                    .getTime()
-                                    );
+                                    Date nextValidTime = new CronExpression(jobInfo.getJobCron()).getNextValidTimeAfter(new Date(jobInfo.getTriggerNextTime()));
+                                    if (nextValidTime != null) {
+                                        jobInfo.setTriggerLastTime(jobInfo.getTriggerNextTime());
+                                        jobInfo.setTriggerNextTime(nextValidTime.getTime());
+                                    } else {
+                                        jobInfo.setTriggerStatus(0);
+                                        jobInfo.setTriggerLastTime(0);
+                                        jobInfo.setTriggerNextTime(0);
+                                    }
 
                                 }
 

xxl-job-admin/src/main/java/com/xxl/job/admin/service/impl/XxlJobServiceImpl.java

 		long nextTriggerTime = exists_jobInfo.getTriggerNextTime();
 		if (exists_jobInfo.getTriggerStatus() == 1 && !jobInfo.getJobCron().equals(exists_jobInfo.getJobCron()) ) {
 			try {
-				nextTriggerTime = new CronExpression(jobInfo.getJobCron()).getNextValidTimeAfter(new Date(System.currentTimeMillis() + JobScheduleHelper.PRE_READ_MS)).getTime();
+				Date nextValidTime = new CronExpression(jobInfo.getJobCron()).getNextValidTimeAfter(new Date(System.currentTimeMillis() + JobScheduleHelper.PRE_READ_MS));
+				if (nextValidTime == null) {
+					return new ReturnT<String>(ReturnT.FAIL_CODE, I18nUtil.getString("jobinfo_field_cron_never_fire"));
+				}
+				nextTriggerTime = nextValidTime.getTime();
 			} catch (ParseException e) {
 				logger.error(e.getMessage(), e);
 				return new ReturnT<String>(ReturnT.FAIL_CODE, I18nUtil.getString("jobinfo_field_cron_unvalid")+" | "+ e.getMessage());
 		// next trigger time (5s后生效，避开预读周期)
 		long nextTriggerTime = 0;
 		try {
-			nextTriggerTime = new CronExpression(xxlJobInfo.getJobCron()).getNextValidTimeAfter(new Date(System.currentTimeMillis() + JobScheduleHelper.PRE_READ_MS)).getTime();
+			Date nextValidTime = new CronExpression(xxlJobInfo.getJobCron()).getNextValidTimeAfter(new Date(System.currentTimeMillis() + JobScheduleHelper.PRE_READ_MS));
+			if (nextValidTime == null) {
+				return new ReturnT<String>(ReturnT.FAIL_CODE, I18nUtil.getString("jobinfo_field_cron_never_fire"));
+			}
+			nextTriggerTime = nextValidTime.getTime();
 		} catch (ParseException e) {
 			logger.error(e.getMessage(), e);
 			return new ReturnT<String>(ReturnT.FAIL_CODE, I18nUtil.getString("jobinfo_field_cron_unvalid")+" | "+ e.getMessage());

xxl-job-admin/src/main/resources/i18n/message.properties

 jobinfo_field_gluetype=运行模式
 jobinfo_field_executorparam=任务参数
 jobinfo_field_cron_unvalid=Cron格式非法
+jobinfo_field_cron_never_fire=Cron非法，永远不会触发
 jobinfo_field_author=负责人
 jobinfo_field_timeout=任务超时时间
 jobinfo_field_alarmemail=报警邮件

xxl-job-admin/src/main/resources/i18n/message_en.properties

 jobinfo_field_gluetype=GLUE Type
 jobinfo_field_executorparam=Param
 jobinfo_field_cron_unvalid=The Cron is illegal
+jobinfo_field_cron_never_fire=The Cron will never fire
 jobinfo_field_author=Author
 jobinfo_field_alarmemail=Alarm email
 jobinfo_field_alarmemail_placeholder=Please enter alarm mail, if there are more than one comma separated

xxl-job-admin/src/main/resources/mybatis-mapper/XxlJobInfoMapper.xml

 		UPDATE xxl_job_info
 		SET
 			trigger_last_time = #{triggerLastTime},
-			trigger_next_time = #{triggerNextTime}
+			trigger_next_time = #{triggerNextTime},
+			trigger_status = #{triggerStatus}
 		WHERE id = #{id}
 	</update>