Spring Cron 调度程序“禁用模式" [英] Spring Cron scheduler “disable pattern”

问题描述

我的应用程序从属性文件加载一些 cron 模式.我正在使用这样的 @Scheduled 注释:

My application loads some cron patterns from a properties file. I'm using the @Scheduled annotation like this:

@Scheduled(cron = "${config.cronExpression:0 0 11,23 * * *}")

现在我想禁用一些任务，最简单的解决方案是输入一个永远不会运行的 cron 模式.为了做到这一点，我考虑使用仅在过去特定日期执行的 cron 表达式.但不幸的是，Spring cron 表达式不允许在过去添加年份或日期.

Now I want to disable some tasks and the easiest solution would be to enter a cron pattern which will never run. In order to do this, I thought about using a cron expression that only executes at a specific day in the past. But unfortunately the Spring cron expressions don't allow to add a year or a date in the past.

有没有永远不会运行的模式?

Is there any pattern that will never run?

推荐答案

从 Spring 5.1.0 开始，@Scheduled 注释可以接受 "-" 作为cron 表达式来禁用 cron 触发器.

As of Spring 5.1.0 the @Scheduled annotation can accept "-" as the cron expression to disable the cron trigger.

根据 Javadocs:

特殊值 "-" 表示禁用的 cron 触发器，主要用于由 ${...} 占位符解析的外部指定值.

The special value "-" indicates a disabled cron trigger, primarily meant for externally specified values resolved by a ${...} placeholder.

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