如何使@Schedule 方法一次只调用一次 [英] How to make @Schedule method to be called only once at a time

问题描述

我们使用 @Schedule EJB 注释来启动计划作业，每 x 秒执行一次增量 SOLR 导入.当然，我们希望索引的时间偏移尽可能少.目前我尝试每 5 秒做一次增量.

We are using the @Schedule EJB annotation to start a scheduled job do a delta SOLR import every x seconds. Of course we want to have as less timeshift in indexing as possible. Currently I try to do the delta every 5 seconds.

所以我的问题是:我可以确保作业只被调用一次吗?因此，假设索引持续时间超过 5 秒，下一个调度调用是否会等到前一个调度返回?

So my question is: Can I make sure the job is only called once? So let's say the indexing is lasting longer than 5 seconds, will the next schedules call wait until the previous is coming back?

推荐答案

是的.您可以将 bean 设为 @Singleton 并使用 @Lock(LockType.Write) 以确保计时器不会并行运行.请注意，LockType.Write 是单例中的默认值.因此，甚至不需要使用注释明确提及.

Yes. You can make the bean a @Singleton and use @Lock(LockType.Write) to make sure that timers don't run in parallel. Note that LockType.Write is the default in a Singleton. So even the explicit mention with the annotation would not be required.

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