如何使用 Spring 3.0 表达式语言参数化 @Scheduled(fixedDelay)? [英] How to parameterize @Scheduled(fixedDelay) with Spring 3.0 expression language?

问题描述

当使用 Spring 3.0 功能注释计划任务时，我想将 fixedDelay 设置为我的配置文件中的参数，而不是像当前一样将其硬连接到我的任务类中...

When using the Spring 3.0 capability to annotate a scheduled task, I would like to set the fixedDelay as parameter from my configuration file, instead of hard-wiring it into my task class, like currently...

@Scheduled(fixedDelay = 5000)
public void readLog() {
        ...
}

不幸的是，似乎使用 Spring 表达式语言 (SpEL) @Value 返回一个 String 对象，而该对象又无法按照fixedDelay 参数.

Unfortunately it seems that with the means of the Spring Expression Language (SpEL) @Value returns a String object which in turn is not able to be auto-boxed to a long value as required by the fixedDelay parameter.

推荐答案

我猜 @Scheduled 注释是不可能的.因此，您的解决方案可能是使用 task-scheduled XML 配置.让我们考虑这个例子(复制自 Spring doc):

I guess the @Scheduled annotation is out of question. So maybe a solution for you would be to use task-scheduled XML configuration. Let's consider this example (copied from Spring doc):

<task:scheduled-tasks scheduler="myScheduler">
    <task:scheduled ref="someObject" method="readLog" 
               fixed-rate="#{YourConfigurationBean.stringValue}"/>
</task:scheduled-tasks>

... 或者如果从 String 到 Long 的强制转换不起作用，则如下所示:

... or if the cast from String to Long didn't work, something like this would:

<task:scheduled-tasks scheduler="myScheduler">
    <task:scheduled ref="someObject" method="readLog"
            fixed-rate="#{T(java.lang.Long).valueOf(YourConfigurationBean.stringValue)}"/>
</task:scheduled-tasks>

同样，我还没有尝试过这些设置中的任何一个，但我希望它可以对您有所帮助.

Again, I haven't tried any of these setups, but I hope it might help you a bit.

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