相关疑难解决方法(0)

你们是否知道Java Map或类似的标准数据存储在给定的超时后自动清除条目？这意味着老化,旧的过期条目会自动"老化".

最好是在可通过Maven访问的开源库中？

我知道自己实现这些功能的方法,并且过去曾多次这样做过,所以我不是在这方面寻求建议,而是指向一个好的参考实现.

基于WeakReference的解决方案(如WeakHashMap)不是一个选项,因为我的键很可能是非实习字符串,我想要一个不依赖于垃圾收集器的可配置超时.

Ehcache也是一个我不想依赖的选项,因为它需要外部配置文件.我正在寻找一个仅限代码的解决方案.

从同一个bean的另一个方法调用缓存方法时,Spring缓存不起作用.

这是一个以清晰的方式解释我的问题的例子.

组态:

<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

该getEmployeeData方法调用使用缓存employeeData …

我在tomcat 9.0.2上使用Spring Boot 1.5.9 并尝试使用spring @Cacheable调度在应用程序启动时运行的缓存刷新作业来缓存查找,并且每24小时重复一次,如下所示:

@Component
public class RefreshCacheJob {

    private static final Logger logger = LoggerFactory.getLogger(RefreshCacheJob.class);

    @Autowired
    private CacheService cacheService;

    @Scheduled(fixedRate = 3600000 * 24, initialDelay = 0)
    public void refreshCache() {
        try {
            cacheService.refreshAllCaches();
        } catch (Exception e) {
            logger.error("Exception in RefreshCacheJob", e);
        }
    }

}

缓存服务如下:

@Service
public class CacheService {

    private static final Logger logger = LoggerFactory.getLogger(CacheService.class);

    @Autowired
    private CouponTypeRepository couponTypeRepository;

    @CacheEvict(cacheNames = Constants.CACHE_NAME_COUPONS_TYPES, allEntries = true)
    public void clearCouponsTypesCache() {} …

我正在为maven多模块项目开发缓存实现(exstremescale),我在其中添加了maven依赖项

    <dependency>
        <groupId>com.ibm.extremescale</groupId>
        <artifactId>ogclient</artifactId>
        <version>8.6.0.20150901-215917</version>
    </dependency>

添加了缓存注释

@Override
@Cacheable(value = "productDetails", key = "#productId + #orgId")
public Product productRead(final String productId, final String productKey, final String orgId, final CRApplicationEnum sourceSystem) throws IntegrationException {

缓存manager.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:cache="http://www.springframework.org/schema/cache"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd">

<cache:annotation-driven />
<bean id="cacheManager" class="org.springframework.cache.support.SimpleCacheManager" primary="true">
    <property name="caches">    
        <set>
            <bean class="com.ibm.websphere.objectgrid.spring.ObjectGridCache"
                p:name="eventDetails"  p:map-name="${iev.eventDetails.mapName}"
                p:object-grid-client-ref="wxsGridClient" />

            <bean class="com.ibm.websphere.objectgrid.spring.ObjectGridCache"
                p:name="eventValidationDetails"  p:map-name="${iev.eventValidationDetails.mapName}"
                p:object-grid-client-ref="wxsGridClient" />

            <bean class="com.ibm.websphere.objectgrid.spring.ObjectGridCache"
                p:name="productDetails"  p:map-name="${ipr.productDetails.mapName}"
                p:object-grid-client-ref="wxsGridClient" />

        </set>
    </property>
</bean>
<bean id="wxsCSDomain"
    class="com.ibm.websphere.objectgrid.spring.ObjectGridCatalogServiceDomainBean"
    p:catalog-service-endpoints="${xscale.catalogServiceEndpoint}" /> …

I'm trying to call a @Cacheable method from within the same class.

And it didn't work. Because of:

In proxy mode (the default), only external method calls coming in through the proxy are intercepted. This means that self-invocation (in effect, a method within the target object that calls another method of the target object) does not lead to actual caching at runtime even if the invoked method is marked with @Cacheable. Consider using the aspectj mode in this case. Also, …

如果我为没有任何参数的方法定义了一个ehcache.

但在我的用例中,我需要通过它的密钥访问我构建的缓存.

所以请为我提供更好的方法来分配密钥.

关注是我的代码:

@Override
@Cacheable(value = "cacheName", key = "cacheKey")
public List<String> getCacheMethod() throws Exception{

PS当我尝试从其他地方访问此方法时,我收到以下错误.

org.springframework.expression.spel.SpelEvaluationException:EL1008E:(pos 0):在'org.springframework.cache.interceptor.CacheExpressionRootObject'类型的对象上找不到字段或属性'cacheKey'