从同一类中调用时，Spring cache @Cacheable方法将被忽略 [英] Spring cache @Cacheable method ignored when called from within the same class

问题描述

我正在尝试从同一类中调用@Cacheable方法:

@Cacheable(value = "defaultCache", key = "#id")
public Person findPerson(int id) {
   return getSession().getPerson(id);
} 

public List<Person> findPersons(int[] ids) {
   List<Person> list = new ArrayList<Person>();
   for (int id : ids) {
      list.add(findPerson(id));
   }
   return list;
}

，并希望也缓存findPersons的结果，但是忽略@Cacheable注释，并且每次都执行findPerson方法.

我在这里做错什么了吗?还是故意的?

解决方案

这是因为在Spring中创建了用于处理缓存和事务相关功能的代理的方式.这是Spring如何处理它的很好参考-

and hoping that the results from findPersons are cached as well, but the @Cacheable annotation is ignored, and findPerson method got executed everytime.

Am I doing something wrong here, or this is intended?

解决方案

This is because of the way proxies are created for handling caching, transaction related functionality in Spring. This is a very good reference of how Spring handles it - Transactions, Caching and AOP: understanding proxy usage in Spring

In short, a self call bypasses the dynamic proxy and any cross cutting concern like caching, transaction etc which is part of the dynamic proxies logic is also bypassed.

The fix is to use AspectJ compile time or load time weaving.

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