Spring Boot自定义驱逐方法无法清除缓存问题咨询

核心问题不是evictByFooId缺少注解，而是Spring缓存注解基于AOP代理实现，类内部直接调用带缓存注解的方法不会触发代理逻辑。

你写的evictByFooId是直接调用同一个类里的evictByTestId，这时候走的是对象本身的方法调用，跳过了Spring生成的代理对象，所以evictByTestId上的@CacheEvict注解根本没生效，自然清不掉缓存。

几种可行的解决办法： #

1. 注入自身代理对象调用 #

在类里注入当前类的代理实例，通过代理对象调用evictByTestId：

@Component
@CacheConfig(cacheNames = ["test"])
class TestCache {
    @Autowired
    private lateinit var selfProxy: TestCache

    @Cacheable(cacheNames = ["test"], key = "#testId")
    fun find(testId: String): String { ... }

    @CachePut(cacheNames = ["test"], key = "#testId")
    fun put(testId: String, set: String): String { ... }

    @CacheEvict(cacheNames = ["test"], key = "#testId")
    fun evictByTestId(testId: String) { }

    fun evictByFooId(fooId: String): Boolean {
        /* some processing to convert fooId to testId */
        val testId = fooId
        selfProxy.evictByTestId(testId)
        return true
    }
}

2. 直接给evictByFooId加@CacheEvict注解 #

如果fooId转testId的逻辑可以用SpEL表达式实现，直接在evictByFooId上标注注解，把转换逻辑写到key里：

@Component
@CacheConfig(cacheNames = ["test"])
class TestCache {
    @Cacheable(cacheNames = ["test"], key = "#testId")
    fun find(testId: String): String { ... }

    @CachePut(cacheNames = ["test"], key = "#testId")
    fun put(testId: String, set: String): String { ... }

    @CacheEvict(cacheNames = ["test"], key = "#testId")
    fun evictByTestId(testId: String) { }

    @CacheEvict(cacheNames = ["test"], key = "#fooId") // 替换成实际转换逻辑，比如T(com.yourpackage.Utils).convertFooToTest(#fooId)
    fun evictByFooId(fooId: String): Boolean {
        return true
    }
}

3. 拆分逻辑到独立组件 #

把缓存操作的逻辑抽成单独的组件，比如TestCacheManager，然后在TestCache里注入这个组件调用，这样调用就会走代理：

@Component
class TestCacheManager {
    @CacheEvict(cacheNames = ["test"], key = "#testId")
    fun evictByTestId(testId: String) { }
}

@Component
@CacheConfig(cacheNames = ["test"])
class TestCache {
    @Autowired
    private lateinit var cacheManager: TestCacheManager

    @Cacheable(cacheNames = ["test"], key = "#testId")
    fun find(testId: String): String { ... }

    @CachePut(cacheNames = ["test"], key = "#testId")
    fun put(testId: String, set: String): String { ... }

    fun evictByFooId(fooId: String): Boolean {
        val testId = fooId
        cacheManager.evictByTestId(testId)
        return true
    }
}

内容的提问来源于stack exchange，提问作者waquner