如何用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功能注释一个计划任务，我想设置fixedDelay作为参数从我的配置文件，而不是硬接线到我的任务类，如目前...

  @Scheduled（fixedDelay = 5000）
 public void readLog（）{
 ... 
} $ b不幸的是，通过Spring表达式语言（EL）的手段，@Value返回一个String对象，它在根据fixedDelay参数的要求，无法自动转换为长整型。
 
 
 
感谢您的帮助。
解决方案
我猜想 @Scheduled 注释是没有问题的。所以也许一个解决方案，你会使用任务调度 XML配置。让我们考虑这个例子（复制自 Spring doc ）：
 < task：scheduled-tasks scheduler =myScheduler> 
< task：scheduled ref =someObjectmethod =readLog
 fixed-rate =＃{YourConfigurationBean.stringValue}/> 
< / task：scheduled-tasks> 
  
 ...或者如果从String到Long的转换不工作， 
 < task：scheduled-tasks scheduler =myScheduler> 
< task：scheduled ref =someObjectmethod =readLog
 fixed-rate =＃{T（java.lang.Long）.valueOf（YourConfigurationBean.stringValue）}/> 
< / task：scheduled-tasks> 
  
再次，我没有尝试过任何这些设置，但我希望它可以帮助你。
 
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() {
        ...
}
Unfortunately it seems that with the means of the Spring Expression Language (EL) @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.

Thanks in advance for your help on this.
解决方案
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>
... 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>
Again, I haven't tried any of these setups, but I hope it might help you a bit.

                        
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