只有在测试对@Cacheable方法的直接调用时，Spring声明式缓存测试才有效

Question

我正在尝试使用以下代码测试@Cacheable方法，但不起作用，该方法未被缓存，如果不是将@Cacheable放在getCountCache方法中，而是将其放在getCount方法中，则测试有效，尝试了很多事情但找不到原因。

@ContextConfiguration
@ExtendWith(SpringExtension.class)
public class CacheTest {

    static class MyRepoImpl {

        private Count count;

        public MyRepoImpl(Count count){
            this.count = count;
        }

        public int getCount(String key){
            return getCountCache(key);
        }

        @Cacheable(cacheNames = "sample")
        public int getCountCache(String key) {
            return count.getCount();
        }
    }

    static class Count {
        int i = 0;
        public int getCount() {
            return i++;
        }
    }

    @EnableCaching
    @Configuration
    public static class Config {

        @Bean CacheManager cacheManager() {
            return new ConcurrentMapCacheManager();
        }

        @Bean MyRepoImpl myRepo() {
            count = Mockito.mock(Count.class);
            return new MyRepoImpl(count);
        }
    }

    static Count count;

    @Autowired MyRepoImpl repo;

    @Test
    public void methodInvocationShouldBeCached() {

        Mockito.when(count.getCount()).thenReturn(1, 2, 3, 4);

        Object result = repo.getCount("foo");
        assertThat(result).isEqualTo(1);
        Mockito.verify(count, Mockito.times(1)).getCount();

        result = repo.getCount("foo");
        assertThat(result).isEqualTo(1);
        Mockito.verify(count, Mockito.times(1)).getCount();
    }
}

Answer 1

由于Spring缓存在bean方法的代理上工作，因此从类内部调用的带有Cachable注释的bean方法不会缓存。为了使缓存机制工作，您需要直接从类外调用它。当从同一个类中调用Spring cache@Cacheable方法时忽略了这个解释真的很好。