Question

从同一个bean的另一个方法调用缓存方法时，Spring缓存无效。

这是一个以清晰的方式解释我的问题的例子。

配置：

<cache:annotation-driven cache-manager="myCacheManager" />

<bean id="myCacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager">
    <property name="cacheManager" ref="myCache" />
</bean>

<!-- Ehcache library setup -->
<bean id="myCache"
    class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" p:shared="true">
    <property name="configLocation" value="classpath:ehcache.xml"></property>
</bean>

<cache name="employeeData" maxElementsInMemory="100"/>

缓存服务：

@Named("aService")
public class AService {

    @Cacheable("employeeData")
    public List<EmployeeData> getEmployeeData(Date date){
    ..println("Cache is not being used");
    ...
    }

    public List<EmployeeEnrichedData> getEmployeeEnrichedData(Date date){
        List<EmployeeData> employeeData = getEmployeeData(date);
        ...
    }

}

结果：

aService.getEmployeeData(someDate);
output: Cache is not being used
aService.getEmployeeData(someDate); 
output: 
aService.getEmployeeEnrichedData(someDate); 
output: Cache is not being used

getEmployeeData方法调用在预期的第二次调用中使用缓存employeeData。但是当在getEmployeeData类（AService）中调用getEmployeeEnrichedData方法时，不会使用缓存。

这是Spring缓存的工作原理还是我错过了什么？

Answer 1

我相信这是它的工作原理。根据我记得的内容，生成了一个代理类，它拦截所有请求并使用缓存值进行响应，但同一类中的“内部”调用不会获得缓存值。

来自https://code.google.com/p/ehcache-spring-annotations/wiki/UsingCacheable

只有通过代理进入的外部方法调用才有截获。这意味着自我调用实际上是一种方法在目标对象内调用目标对象的另一个方法，即使在运行时也不会导致实际的缓存拦截调用的方法用@Cacheable标记。

Answer 2

以下示例是我用来从同一个bean中命中代理的，它类似于@ mario-eis'解决方案，但我发现它更具可读性（可能不是:-)。无论如何，我喜欢在服务级别保留@Cacheable注释：

@Service
@Transactional(readOnly=true)
public class SettingServiceImpl implements SettingService {

@Inject
private SettingRepository settingRepository;

@Inject
private ApplicationContext applicationContext;

@Override
@Cacheable("settingsCache")
public String findValue(String name) {
    Setting setting = settingRepository.findOne(name);
    if(setting == null){
        return null;
    }
    return setting.getValue();
}

@Override
public Boolean findBoolean(String name) {
    String value = getSpringProxy().findValue(name);
    if (value == null) {
        return null;
    }
    return Boolean.valueOf(value);
}

/**
 * Use proxy to hit cache 
 */
private SettingService getSpringProxy() {
    return applicationContext.getBean(SettingService.class);
}
...

另见Starting new transaction in Spring bean

Answer 3

从Spring 4.3开始，使用self-autowiring注释可以解决问题：

@Resource

Answer 4

以下是我对同一类中只有少量方法调用的小项目所做的工作。强烈建议使用代码内文档，因为它可能会让同事感到惊讶。但它易于测试，简单，快速实现，并使我完全成熟的AspectJ仪器。但是，为了更加繁重的使用，我建议使用AspectJ解决方案。

@Service
@Scope(proxyMode = ScopedProxyMode.TARGET_CLASS)
class AService {

    private final AService _aService;

    @Autowired
    public AService(AService aService) {
        _aService = aService;
    }

    @Cacheable("employeeData")
    public List<EmployeeData> getEmployeeData(Date date){
        ..println("Cache is not being used");
        ...
    }

    public List<EmployeeEnrichedData> getEmployeeEnrichedData(Date date){
        List<EmployeeData> employeeData = _aService.getEmployeeData(date);
        ...
    }
}

Answer 5

是的，由于其他帖子中已经提到的原因，缓存不会发生。但是我会通过将该方法放到它自己的类（在这种情况下是服务）来解决问题。这样，您的代码将更易于维护/测试和理解。

@Service // or @Named("aService")
public class AService {

    @Autowired //or how you inject your dependencies
    private EmployeeService employeeService;
 
    public List<EmployeeData> getEmployeeData(Date date){
          employeeService.getEmployeeData(date);
    }

    public List<EmployeeEnrichedData> getEmployeeEnrichedData(Date date){
        List<EmployeeData> employeeData = getEmployeeData(date);
        ...
    }

}

@Service // or @Named("employeeService")
public class EmployeeService {

    @Cacheable("employeeData")
    public List<EmployeeData> getEmployeeData(Date date){
        println("This will be called only once for same date");
        ...
    }

}

Answer 6

使用静态编织在bean周围创建代理。在这种情况下，即使是“内部”方法也能正常工作

Answer 7

在我的情况下，我添加了变量：

@Autowired
private AService  aService;

因此，我使用getEmployeeData来调用aService方法

@Named("aService")
public class AService {

@Cacheable("employeeData")
public List<EmployeeData> getEmployeeData(Date date){
..println("Cache is not being used");
...
}

public List<EmployeeEnrichedData> getEmployeeEnrichedData(Date date){
    List<EmployeeData> employeeData = aService.getEmployeeData(date);
    ...
}

}

在这种情况下，它将使用缓存。

Answer 8

如果您从同一bean调用缓存的方法，它将被视为私有方法，并且注释将被忽略

Answer 9

为此，我使用内部内部bean（FactoryInternalCache）和真正的缓存：

@Component
public class CacheableClientFactoryImpl implements ClientFactory {

private final FactoryInternalCache factoryInternalCache;

@Autowired
public CacheableClientFactoryImpl(@Nonnull FactoryInternalCache factoryInternalCache) {
    this.factoryInternalCache = factoryInternalCache;
}

/**
 * Returns cached client instance from cache.
 */
@Override
public Client createClient(@Nonnull AggregatedConfig aggregateConfig) {
    return factoryInternalCache.createClient(aggregateConfig.getClientConfig());
}

/**
 * Returns cached client instance from cache.
 */
@Override
public Client createClient(@Nonnull ClientConfig clientConfig) {
    return factoryInternalCache.createClient(clientConfig);
}

/**
 * Spring caching feature works over AOP proxies, thus internal calls to cached methods don't work. That's why
 * this internal bean is created: it "proxifies" overloaded {@code #createClient(...)} methods
 * to real AOP proxified cacheable bean method {@link #createClient}.
 *
 * @see <a href="https://stackoverflow.com/questions/16899604/spring-cache-cacheable-not-working-while-calling-from-another-method-of-the-s">Spring Cache @Cacheable - not working while calling from another method of the same bean</a>
 * @see <a href="https://stackoverflow.com/questions/12115996/spring-cache-cacheable-method-ignored-when-called-from-within-the-same-class">Spring cache @Cacheable method ignored when called from within the same class</a>
 */
@EnableCaching
@CacheConfig(cacheNames = "ClientFactoryCache")
static class FactoryInternalCache {

    @Cacheable(sync = true)
    public Client createClient(@Nonnull ClientConfig clientConfig) {
        return ClientCreationUtils.createClient(clientConfig);
    }
}
}

Answer 10

到目前为止，最简单的解决方案是像这样引用：

AService.this.getEmployeeData(date);

Spring Cache @Cacheable - 从同一个bean的另一个方法调用时不工作

10 个答案: