Spring @ManagerResource的含义：persistPolicy，persistPeriod，persistLocation和currencyTimeLimit

Question

以下字段在用于JMX的Spring @ManagedResource中意味着什么？ Spring documentation中没有Javadoc或相关说明。

 1. String persistPolicy() default "";
 2. int persistPeriod() default -1;
 3. String persistLocation() default "";
 4. int currencyTimeLimit() default -1;

Answer 1

这些传递到JMX api - 您可以在JMX java doc中找到有关它的更多信息。在此处复制相关部分 -

 persistPolicy  : OnUpdate|OnTimer|NoMoreOftenThan|OnUnregister|Always|Never  
 persistLocation : The fully qualified directory name where the MBean should be persisted (if appropriate)
 persistFile    : File name into which the MBean should be persisted
 persistPeriod  : seconds - frequency of persist cycle for OnTime and NoMoreOftenThan PersistPolicy 
 currencyTimeLimit : how long value is valid, <0 never, =0 always, >0 seconds  

Answer 2

我怀疑这些注释字段无效 - 例如：Did Java 5 forget JMX MBean persistence?