java - 为了应用程序安全，我们可以在计划的缓存逐出方法中添加 Spring Boot 可缓存方法吗？

Question

我正在尝试实现 Spring boot 可缓存。我想缓存 ws 调用的方法响应。

1)我能够根据请求实现缓存。

 @Cacheable(cacheNames = "mycache", key = "#root.target.cacheKey")
   public String myMethod() {
}

2) 我安排每天凌晨 1 点之后进行缓存逐出。

@Scheduled(cron = "${1 AM}")
    @CacheEvict(cacheNames = "mycache", key = "#root.target.CACHE_KEY")
    public void clearCache() {

        LOGGER("Cache eviction:: ");

    }

这也工作得很好。我的问题是，在没有从浏览器向 @Cacheable 注释方法发送任何请求的情况下进行驱逐后，我可以在驱逐后调用 @Cacheable 注释方法来确保应用程序安全吗？

@Scheduled(cron = "${1 AM}")
        @CacheEvict(cacheNames = "mycache", key = "#root.target.CACHE_KEY")
        public void clearCache() {

            LOGGER("Cache eviction:: ");
        myMethod();
        }

This is for application safety .Incase @Cacehable fails to cache response it won't impact the application. I do agree that first request after evict will definitely get inside @Cacheable annotated method and add to cache .But need to make sure that I am following the right approach

有人可以透露一些信息，以便我纠正它

Answer 1

所以，我正在查看来源。

@CacheEvict AspectJ pointcut 定义为

/**
 * Matches the execution of any public method in a type with the @{@link CacheEvict}
 * annotation, or any subtype of a type with the {@code CacheEvict} annotation.
 */
private pointcut executionOfAnyPublicMethodInAtCacheEvictType() :
    execution(public * ((@CacheEvict *)+).*(..)) && within(@CacheEvict *);

然后分组为更通用的组

protected pointcut cacheMethodExecution(Object cachedObject) :
    (executionOfAnyPublicMethodInAtCacheableType()
            || executionOfAnyPublicMethodInAtCacheEvictType()
            || ...

使用此切入点的advice是一个around建议，这意味着您可以检查方法调用的输入和输出值，并在需要时继续进行实际通话。

Object around(final Object cachedObject) : cacheMethodExecution(cachedObject) {
    MethodSignature methodSignature = (MethodSignature) thisJoinPoint.getSignature();
    Method method = methodSignature.getMethod();

    CacheOperationInvoker aspectJInvoker = new CacheOperationInvoker() {
        public Object invoke() {
            try {
                // Call your method implementation
                return proceed(cachedObject);
            }
            catch (Throwable ex) {
                throw new ThrowableWrapper(ex);
            }
        }
    };

    try {
        // Evict cache, in your case
        return execute(aspectJInvoker, thisJoinPoint.getTarget(), method, thisJoinPoint.getArgs());
    }
    catch (CacheOperationInvoker.ThrowableWrapper th) {
        AnyThrow.throwUnchecked(th.getOriginal());
        return null; // never reached
    }
}

如您所见，在通过调用 execute 执行缓存驱逐操作之前，通过 proceed 调用该方法实现。

因此您的“测试”调用没有实际意义。