石英触发器不能立即触发

Question

我想用quartz scheduler使用jdbc数据存储立即执行作业~。然而，即使我使用now（）或调用triggerjob进行调度，在调度和触发器fire之间也有20-30秒的延迟。

我尝试用一个简单的触发器执行作业：

JobKey key = //...
        JobDetail jobDetail = newJob(jobBean.getClass())
                .withIdentity(key)
                .usingJobData(new JobDataMap(jobParams))
                .storeDurably()
                .build();

        Trigger trigger = newTrigger()
                .withIdentity(key.getName(), key.getGroup())
                .startNow()
                .withSchedule(SimpleScheduleBuilder.simpleSchedule()
                        .withMisfireHandlingInstructionFireNow()
                        .withRepeatCount(0))
                .build();

        scheduler.scheduleJob(jobDetail, trigger);

并且我还尝试用调度程序触发：

 JobKey key = // ...
        JobDetail jobDetail = newJob(jobBean.getClass())
                .withIdentity(key)
                .storeDurably()
                .build();
        scheduler.addJob(jobDetail, true);


        scheduler.triggerJob(key, new JobDataMap(jobParams));

下面是显示延迟的侦听器日志。

2019-05-15 13:59:52,066Z  INFO  [nio-8081-exec-2] c.m.f.s.logger.SchedulingListener                  : Job added: newsJobTemplate:1557928791965
2019-05-15 13:59:52,066Z  INFO  [nio-8081-exec-2] c.m.f.s.logger.SchedulingListener                  : Job scheduled: newsJobTemplate:1557928791965
2019-05-15 14:00:18,660Z  INFO  [eduler_Worker-1] c.m.f.s.logger.TriggerStateListener                : Trigger fired: QUARTZ_JOBS.newsJobTemplate:1557928791965 {}
2019-05-15 14:00:18,703Z  INFO  [eduler_Worker-1] c.m.f.s.logger.JobExecutionListener                : Job will be executed: QUARTZ_JOBS.newsJobTemplate:1557928791965
2019-05-15 14:00:19,284Z  INFO  [eduler_Worker-1] c.m.f.s.logger.JobExecutionListener                : Job was executed: QUARTZ_JOBS.newsJobTemplate:1557928791965

Answer 1

我在这里和那里发现的碎屑表明问题是与交易有关的。所以我从服务方法中删除了@transactional，瞧，它起作用了。看起来，当您调用trigger时，调度程序线程会异步地尝试从DB中查找调度和触发器，但当时事务没有提交。稍后，调度程序线程再次查找数据库，并最终找到它。